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Pugar Septia G.
"Skripsi ini membahas mengenai pengaruh konsentrasi NaOH dan rasio NaOH:Na2SiO3, rasio air/prekursor, suhu curing, dan jenis prekursor terhadap kuat tekan beton geopolimer pada beberapa penelitian. Analisa dilakukan berdasarkan data yang sudah dikelompokkan berdasarkan empat faktor yang mempengaruhi kuat tekan beton geopolimer yaitu konsentrasi NaOH dan rasio NaOH:Na2SiO3, rasio air/prekursor, suhu curing, dan jenis prekursor yang digunakan. Hasil penelitian dari data-data yang telah dikelompokkan ke dalam empat kategori tersebut dianalisa dengan cara membandingkan hasil penelitian yang ditinjau dengan dasar teori tentang geopolimer dan hasil-hasil penelitian yang telah diakukan sebelumnya.
Hasil penelitian-penelitian yang ditinjau dalam studi literatur ini menunjukkan bahwa konsentrasi NaOH dan rasio massa NaOH:Na2SiO3 yang optimum, rasio massa air/precursor yang optimum, dan suhu curing yang lebih tinggi akan menghasilkan beton geopolimer dengan kuat tekan paling tinggi. Namun, pengaruh faktor jenis prekursor pada penelitian yang ditinjau pada studi literatur ini menunjukkan bahwa penggunaan fly ash tipe C sebagai precursor menghasilkan mortar geopolimer dengan kuat tekan yang lebih tinggi daripada mortar geopolimer yang menggunakan fly ash tipe F sebagai precursor. Hasil penelitian yang bertentangan dengan dasar teori yang ada ini dapat disebabkan oleh pengaruh faktor dominan lain seperti suhu curing dan kandungan atom Si pada geopolimer.

This literature study discusses about the effect of concentration of NaOH and ratio of NaOH:Na2SiO3, ratio of water/precursor, curing temperature, and type of precursor to the compressive strength of geopolymer concrete in several studies. The analysis was made based on datas that has been classified according four factors that affect the value of compression strength of geopolymer concrete such as concentration of NaOH and ratio of NaOH:Na2SiO3, ratio of water/precursor, curing temperature, and type of precursor those are used. Result of datas that has been classified to four catagories analyzed with compare them to basic theory of geopolymer and results of studies that has been performed before.
Result of this literature study show that concentration of NaOH and optimum ratio of NaOH:Na2SiO3, optimum ratio of water/precursor, and higher curing temperature will produce highest compressive strength of geopolymer concrete. In the other hand, affect of type of precursor in this literatute study show that compressive strength of geopolymer mortar with fly ash type C as precursor is higher than geopolymer mortar with fly ash type F as precursor. The result which contra with basic theory is caused by affect of another dominant factors such as curing temperature and content of Si in geopolymer.
"
Depok: Fakultas Teknik Universitas Indonesia, 2011
S50709
UI - Skripsi Open  Universitas Indonesia Library
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Boy Ahmad Aprilando
"Pengaruh substitusi terak baja sebagai agregat kasar pada kekuatan tekan dan korosi baja tulangan pada beton geopolimer berbahan dasar fly ash dalam air laut dan lingkungan hujan asam Nilai kuat tekan dievaluasi dengan mengukur beban maksimum yang dapat diterima menggunakan peralatan pengujian kompresi Kuat tekan tergantung pada beberapa faktor seperti waktu dan suhu curing serta proporsi pencampuran Kekuatan tekan beton geopolimer dengan substitusi terak baja lebih tinggi dibandingkan dengan beton geopolimer normal dengan agregat kerikil Nilai kuat tekan optimum ditemukan pada hari ketiga curing pada suhu 60oC untuk beton geopolimer dengan substitusi terak baja dan beton geopolimer normal Korosi tulangan dievaluasi dengan mengukur kepadatan arus korosi menggunakan polarisasi linear potensiostatik scan Laju korosi icorr baja tulangan dalam beton geopolimer dengan substitusi terak baja lebih tinggi dibandingkan dengan beton geopolimer normal tanpa terak baja dalam medium air laut Sedangkan dalam lingkungan hujan asam substitusi terak baja meningkatkan ketahanan korosi Laju korosi geopolimer beton dengan substitusi terak baja ditemukan lebih rendah dibandingkan dengan beton geopolimer normal Laju korosi sangat tinggi pada hari hari awal dan menurun seiring waktu.

The effect of steel slag substitution as coarse aggregate on compressive strength and corrosion of reinforcing steel in fly ash based geopolymer concrete in seawater and acid rain environment was studied The compressive strength was evaluated by measuring maximum acceptable load using compression testing equipment The compressive strength depends on several factors such as time and temperature of curing and mixing proportion The compressive strength of geopolymer concrete with steel slag substitution is higher as compared to normal geopolymer concrete with gravel aggregate The compressive strength optimum was found in the third day curing at temperature 60oC for both of geopolymer concrete with steel slag substitution and normal geopolymer concrete The reinforcement corrosion was evaluated by measuring the corrosion current density using liner polarization potentiostatic scan The Corrosion rate icorr of reinforcing steel in geopolymer concrete with steel slag substitution were found to be higher as compared to normal geopolymer concrete without steel slag in seawater medium Whereas in acid rain environment steel slag substitution increase corrosion resistance Corrosion rate geopolymer concrete with steel slag substitution were found to be lower as compared to normal geopolymer concrete The corrosion rate is very high early days and decreases by time "
Depok: Fakultas Teknik Universitas Indonesia, 2013
S54657
UI - Skripsi Membership  Universitas Indonesia Library
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Emir Kharisma Firdaus
"Pertumbuhan infrastruktur Indonesia semakin meningkat. Salah satu bahan utama dalam pembangunan infrastruktur adalah beton dengan semen sebagai pengikatnya. Semakin tingginya pembangunan infrastruktur akan membuat kebutuhan semen juga bertambah. Akan tetapi tanpa disadari, industri semen merupakan penghasil sekitar 8% dari keseluruhan emisi gas CO2 di dunia. Jika semen tetap menjadi komponen utama dalam pembuatan beton, angka ini akan terus bertambah dari tahun ke tahun. Pencegahan perlu dilakukan dengan melakukan penelitian untuk mencari bahan-bahan pengganti semen. Dalam penelitian kali ini dilakukan studi untuk mendapatkan rancang campuran beton geopolimer, yaitu beton yang dibuat tanpa menggunakan semen. Beton geopolimer yang dibuat pada penelitian kali ini menggunakan terak nikel hasil produk Geofast sebagai bahan utamanya. Dari hasil uji bahan agregat kasar dan halus, peneliti melakukan studi berbagai rancang campuran beton geopolimer dengan variasi umur beton 14 hari dan 28 hari. Masing-masing sampel kemudian dilakukan pengujian untuk mengetahui perkembangan kuat tekan, lentur dan belah dari setiap sampel yang dibuat.

Indonesia's infrastructure growth is increasing. One of the main ingredients in infrastructure development is concrete with cement as the binding. The higher infrastructure development will make the demand for cement also increase. But without realizing it, the cement industry is a producer of about 8% of total CO2 gas emissions in the world. If cement remains a major component in making concrete, this number will continue to grow from year to year. Prevention needs to be done by conducting research to look for cement replacement materials. In this research, a study was conducted to obtain a geopolymer concrete mixture design, which is concrete that is made without using cement. Geopolymer concrete made in this study uses nickel slag from Geofast products as its main ingredient. From the results of the coarse and fine aggregate material test, the researchers conducted a study of various geopolymer concrete mix designs with concrete age variations of 14 days and 28 days. Each sample is then tested to determine the development of compressive strength, flexure, and splitting of each sample made."
Depok: Fakultas Teknik Universitas Indonesia, 2020
S-pdf
UI - Skripsi Membership  Universitas Indonesia Library
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Hestia Hartini Novitasari
"[ ABSTRAK
Kaca merupakan sumber silika amorphous yang baik serta memiliki komposisi kimia dan reaktivitas yang tepat untuk melakukan reaksi Pozzolan. Sehingga muncul lah ide untuk menggunakan kaca sebagai agregat kasar pada beton. Pada penelitian ini, sampel yang dibuat adalah dua jenis beton, yaitu Portland dan Geopolimer dengan variasi substitusi kaca sebanyak 0%, 25%, 50%, 100%. Pengujian yang dilakukan adalah uji tekan dan pengamatan foto makro. Komposisi beton, sejarah perlakuan, dan suhu curing memberi pengaruh signifikan pada nilai kuat tekan yang dihasilkan. Kesimpulan yang didapatkan adalah beton Portland dan beton geopolimer dengan substitusi kaca sebesar 50% memiliki kuat tekan tertinggi, dan pasta geopolimer dapat melekat pada kaca namun pasta semen tidak.
ABSTRACT
Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.;Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.;Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.;Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.;Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not., Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.]"
Depok: Fakultas Teknik Universitas Indonesia, 2016
S62219
UI - Skripsi Membership  Universitas Indonesia Library
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Pramudia Widaryanto
"Portland Composite Cement (PCC) merupakan campuran clinker dan bahan mineral tambahan seperti fly ash, pozzolan, dll. Produksi semen PCC yang lebih sedikit mengandung clinker ini dapat mengurangi ketergantungan terhadap clinker yang produksinya semakin berkurang. Seiring beredarnya semen PCC di pasaran, beton dengan semen PCC perlu diuji kekuatannya. Penelitian ini bertujuan untuk mendapatkan nilai-nilai kuat tekan, kuat tarik belah, dan kuat lentur beton menggunakan semen PCC. Beton didesain dengan menggunakan faktor air semen 0,3; 0,35; 0,45; 0,55; 0,65; 0,75; dan 0,8. Pengujian dilakukan pada umur 7, 14 dan 28 hari.
Hasil pengujian diolah dengan metode rata-rata dan metode chisquare. Hasil pengolahan data menunjukkan metode chi-square menghasilkan data yang lebih akurat dengan jumlah error yang lebih sedikit. Grafik yang dihasilkan menunjukkan hubungan antara kuat tekan, kuat tarik belah dan kuat lentur dengan umur adalah berbanding lurus. Sedangkan hubungan antara kuat tekan, kuat tarik belah dan kuat lentur dengan FAS adalah berbanding terbalik. Dengan membandingkan kuat tekan, kuat tarik belah dan kuat lentur didapatkan hubungan kuat tekan dan kuat lentur adalah fr = 0,623 _ fc?, hubungan kuat tekan dan kuat tarik belah adalah ft = 0,656 _ fc?, dan hubungan kuat tarik belah dan kuat lentur adalah fr = 0,948 _ ft.

Portland Composite Cement (PCC) is a mixture of clinker and mineral additions such as fly ash, pozzolan, etc.. PCC's production which contain fewer clinker, can reduce the dependence on clinker, whose the production has decreased. Along the spread of PCC in the market, concrete using PCC need to be tested. This study aimed to obtain the values of compressive strength, splitting tensile, and flexural strength of concrete using PCC. Concrete is designed with water cement ratio 0,3; 0,35; 0,45; 0,55; 0,65; 0,75; dan 0,8. Tests are performed at the age of 7, 14 and 28 days.
The test results are processed by average method and chi-square method. Data processing results show chi-square method produces more accurate data with a smaller number of errors. The resulting graphs show the relationship between compressive strength, splitting tensile and flexural strength is directly proportional to the age. While the relationship between compressive strength, splitting tensile and flexural strength is inversely proportional to the water cement ratio. By comparing the compressive strength, splitting tensile and flexural strength, we can also obtain the relationship between compressive and flexural strength is fr = 0,623 _ fc?, the relationship between compressive and splitting tensile strength is ft = 0,656 _ fc?, and the relationship between splitting tensile and flexural strength is fr = 0,948 _ ft.
"
Depok: Fakultas Teknik Universitas Indonesia, 2010
S50641
UI - Skripsi Open  Universitas Indonesia Library
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Raina S. Dryana
"Skripsi ini membahas tentang pengaruh faktor air semen (FAS) terhadap kekuatan tekan, tarik belah, dan tarik lentur beton normal yang dibuat menggunakan semen tipe Ordinary Portland Cement (OPC). Penelitian ini dilatarbelakangi oleh kebutuhan adanya gambaran hubungan antara kekuatan, umur dan FAS beton dengan semen portland tipe I yang digunakan untuk berbagai tujuan namun keberadaannya mulai tergantikan dengan semen tipe baru. Penelitian dilakukan melalui pengujian di laboratorium dengan membuat benda uji silinder beton diameter 100 mm dan tinggi 200 mm untuk uji kuat tekan sebanyak 105 buah, silinder beton diameter 150 mm dan tinggi 300 mm untuk uji kuat tarik belah sebanyak 105 buah, dan balok untuk uji kuat lentur dengan ukuran 150 mm x150 mm x 600 mm sebanyak 63 buah.
Dari hasil penelitian didapatkan bahwa semakin besar nilai FAS maka kekuatan beton yang diperoleh baik kuat tekan, kuat tarik belah, dan kuat lentur akan semakin menurun karena jumlah semen sebagai sumber kekuatan beton juga berkurang. Pengolahan data menggunakan dua metode statistik yaitu metode nilai rata - rata dan metode chi square yang menghasilkan hubungan untuk beton umur 28 hari: kuat tekan (fc - ) dengan kuat lentur (fr) adalah : fr=0.656?fc - kuat tarik belah (ft) dengan kuat lentur (fr) adalah : fr=0.967ft kuat tekan ((fc - ) dengan kuat tarik belah (ft) adalah : ft=0.666?fc - .

The focus of this study is about the effect of water cement ratio (FAS) on the compressive strength, splitting tensile strength, and flexural strength of normal concrete made using Ordinary Portland Cement (OPC). The background of this research is the need for illustrating the correlation between concrete strength, age and FAS with OPC which is used for many purposes but its existence began to be replaced with other Portland cement. This research through attempt in laboratory by making 105 samples concrete cylinder with diameter of 100 mm and 200 mm height for compressive strength test, 105 samples cylinder with diameter of 150 mm and 300 mm height for splitting tensile strength test and 63 samples beam for flexural strength test with size 150 mm x 150 mm x 600 mm.
The result shows that the greater value of FAS, the concrete strength obtained compressive strength, splitting tensile strength, and flexural strength will also decrease because the amount of cement concrete as a source of strength is also reduced. Processing data was using two statistical methods which is average value method and chi square method, produced the relationship for 28 days of concrete age : compressive strength (fc') and flexural strength (fr) : fr=0.656?fc' splitting tensile strength (ft) and flexural strength (fr) : fr=0.967ft compressive strength ((fc') and splitting tensile strength (ft) : ft=0.666?fc'.
"
Depok: Fakultas Teknik Universitas Indonesia, 2010
S50642
UI - Skripsi Open  Universitas Indonesia Library
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Fisabilla Magma Anggreia Vistha
"Penelitian mengenai penggunaan geopolimer sedang banyak dilakukan karena keunggulannya yang lebih ramah lingkungan sehingga menjadi pilihan dalam pembangunan infrastruktur. Semakin tingginya tingkat pembangunan menyebabkan dibutuhkannya waktu yang lebih efektif selama proses pembangunan. Pada penelitian ini, dilakukan penambahan accelerator Calcium Aluminate Cement (CAC) pada geopolimer untuk mempercepat waktu pengikatan, namun tetap memiliki nilai kuat tekan tinggi. Penelitian ini bertujuan untuk mengetahui pengaruh accelerator pada geopolimer, dosis accelerator yang lebih baik digunakan untuk meningkatkan kuat tekan, mekanisme kerja accelerator pada geopolimer, serta perbedaan morfologi permukaan struktur mikro. Penelitian dilakukan dengan membuat geopolimer fly ash dan menambahkan accelerator sebesar 0%, 1%, dan 2%, kemudian melakukan curing pada temperatur ruang selama 1, 3, 7, dan 28 hari. Selanjutnya, dilakukan pengujian kuat tekan, vicat, DSC, SEM, XRD, dan FTIR. Hasil penelitian menunjukkan bahwa penambahan accelerator meningkatkan kuat tekan dan mempercepat waktu pengikatan. Pada umur 28 hari, nilai kuat tekan geopolimer dengan 0%, 1%, dan 2% accelerator secara berturut-turut adalah 32,16 MPa, 48,4 MPa, dan 53,3 MPa. Penambahan 2% accelerator memberikan hasil kuat tekan yang lebih maksimal, namun dengan perbedaan yang tidak signifikan dengan penambahan 1% accelerator. Peningkatan kuat tekan kemungkinan disebabkan oleh terbentuknya gel N-A-S-H, C-S-H, dan C-A-S-H yang menyebabkan struktur mikro menjadi lebih rapat.

Research on the use of geopolymers is being widely conducted due to their environmental advantages, making them a preferred choice in infrastructure development. The increasing rate of construction necessitates more efficient construction processes. In this research, an accelerator in the form of Calcium Aluminate Cement (CAC) was added to geopolymer in order to achieve faster setting time while still maintaining high compressive strength. The purpose of this research was to investigate the effect of the accelerator on geopolymer, determine the better dosage of the accelerator to enhance compressive strength, understand the mechanism of the accelerator on geopolymer, and differences in microstructure morphology. The research was conducted by making fly ash-based geopolymer mortar with the addition of accelerator at concentrations of 0%, 1%, and 2%, followed by curing for 1, 3, 7 and 28 days. Then, compressive strength test, vicat test, and DSC test were carried out as well as SEM, XRD, and FTIR characterization. The test results showed that the addition of the accelerator improved the compressive strength and accelerated the setting time. At 28 days, the compressive strength values of the geopolymer with 0%, 1%, and 2% accelerator were 32,16 MPa, 48,4 MPa, and 53,3 MPa, respectively. The addition of 2% accelerator gives maximum compressive strength results in geopolymer, but with an insignificant difference with the addition of 1% accelerator. The increase in compressive strength possibly due to the formation of N-A-S-H, C-S-H, and C-A-S-H gels which caused the microstructure to become denser."
Depok: Fakultas Teknik Universitas Indonesia, 2023
S-pdf
UI - Skripsi Membership  Universitas Indonesia Library
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Ferdy
"Perubahan iklim telah memicu perkembangan green technology. Geopolimer berbahan dasar abu terbang merupakan material ramah lingkungan yang dapat digunakan sebagai semen instan untuk bahan reparasi jalan beton. Tujuan dari penelitian ini ialah mengetahui kondisi perlakuan temperatur dan waktu curing yang terbaik untuk menghasilkan pasta geopolimer dengan kuat tekan yang optimal.
Dua variabel temperatur dan tiga variabel waktu digunakan dalam penelitian ini untuk ditinjau pengaruhnya terhadap kuat tekan yang dihasilkan oleh pasta geopolimer. Dari penelitian ini dapat disimpulkan bahwa untuk waktu curing yang sama, temperatur yang lebih tinggi akan menghasilkan kuat tekan yang lebih tinggi. Pada temperatur yang sama kuat tekan dari pasta geopolimer meningkat seiring dengan bertambahnya waktu curing.

Climate change have been develop green technology. Geopolymer fly ash based is categorized as friendly environment material which is used as rapid setting cement for repair material of concrete road. The purpose of this research was aimed to study the best temperature and curing time to produce geopolymer paste with optimum compressive strength.
Two variable of temperature and three variable of time were used in this research to see their effect to compressive strength. The result from this research show that for the same curing time, elevated temperature achieve higher compressive strength. In same temperature, compressive strength from geopolymer paste increase along with curing time.
"
Depok: Fakultas Teknik Universitas Indonesia, 2010
S51515
UI - Skripsi Open  Universitas Indonesia Library
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Bastian Okto Bangkit Sentosa
"Semen Portland Pozzolan (SPP) adalah suatu bahan perekat hidrolis yang dibuat dengan menggiling halus klinker semen Portland dengan pozzolan, atau suatu campuran yang merata antara bubuk semen Portland dan bubuk pozzolan selama penggilingan atau pencampuran. SPP untuk mencapai kekuatannya membutuhkan waktu relatif lebih lambat dibandingkan dengan semen Portland lainnya meskipun ultimate strenght yang dicapai SPP mungkin sama atau lebih besar dari yang terbuat dari semen Portland. Dalam penelitian ini, faktor air semen (FAS) yang digunakan bervariasi diantara 0,3; 0,35; 0,45; 0,55; 0,65; 0,75; dan 0,8 serta diamati pengaruhnya terhadap kuat tekan, kuat tarik belah dan kuat lentur pada beton menggunakan SPP. Pengujian kuat tekan, kuat tarik belah, dan kuat lentur dilakukan pada umur 7, 14 dan 28 hari.
Hasil pengujian diolah dengan dua metode yaitu metode rata-rata dan chi-square untuk membandingkan metode mana yang paling akurat. Kuat tekan, kuat tarik belah dan kuat lentur bertambah seiring dengan pertambahan umur beton pada semua FAS. Namun kenaikan FAS berbanding terbalik dengan kuat tekan, kuat tarik belah dan kuat lentur beton. Kenaikan kuat tekan akan diikuti dengan kenaikan kuat tarik belah dan kuat lenturnya sehingga kenaikan kuat tarik belah akan mengikuti kenaikan kuat lentur dan sebaliknya.

Pozzolan Portland Cement (PPC) is an hydraulic adhesive which made by grinding Portland cement clinker with Pozzolan, or an equal mixture of Portland cement powder and powder Pozzolan during milling or mixing. PPC to achieve the strength it took relatively more slowly than other portland cement, although the ultimate PPC strenght achieved equal or perhaps greater than that made from portland cement. In this research, water cement ratio which is used variation from 0,30 0,3; 0,35; 0,45; 0,55; 0,65; 0,75; and 0,8 also observed the influent of compressive strength, splitting tensile strength, and flexural strength concrete using SPP. Compressive strength, splitting tensile strength and flexural strength test is done on 7, 14, and 28 days.
The test result is processed by two methods which are average method and chi square method for comparing the best accuracy method. Compressive strength, splitting tensile strength, and flexural strength increase following concrete age on all water cement ratio. However, increasing water cement ratio is inversely with compressive strength, splitting tensile strength, and flexural strength. Increasing compressive strength will be followed by splitting tensile strength and flexural strength so that increasing splitting tensile strength will follow increasing flexural strength."
Depok: Fakultas Teknik Universitas Indonesia, 2010
S50594
UI - Skripsi Open  Universitas Indonesia Library
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Raden Nafian Priatmojo
"Beton merupakan material penting yang banyak digunakan dalam pembangunan infrastruktur. Sehingga penggunaan semen sebagai bahan dasar pengikat beton juga akan semakin meningkat setiap tahunnya. Namun yang harus diperhatikan dalam proses produksi semen ini ialah terjadinya pelepasan karbon dioksida (CO2) yang sangat banyak ke atmosfer dan dapat menyebabkan kerusakan lingkungan. Untuk mengatasi permasalahan tersebut dibutuhkan material lain sebagai bahan pengganti semen yang lebih ramah lingkungan. Beton geopolimer merupakan salah satu alternatif untuk menggantikan beton yang berbahan dasar semen sebagai material yang kurang ramah lingkungan. Pembuatan beton geopolimer tidak menggunakan semen sebagai bahan pengikat melainkan menggunakan Abu Terbang (Fly Ash) sebagai penggantinya yang kaya akan Silika dan Alumina dan dapat bereaksi dengan cairan alkalin untuk menghasilkan bahan pengikat (binder). Penggunaan silica fume sebesar 10% dalam campuran pasta juga akan diamati dalam pengaruh terhadap sifat mekanik beton setelah beton direndam dalam lingkungan air danau selama 1 bulan. Tes kuat tekan menggunakan sampel berbentuk silinder 15x30cm dengan curing selama 72 jam pada suhu 800C dilakukan untuk membandingkan setiap benda uji dari komposisi silica fume dan juga kondisi lingkungan yang berbeda. Hasil studi menunjukkan bahwa kuat tekan beton dipengaruhi oleh penambahan 10% silica fume dan juga dalam kondisi perendaman di air danau. Nilai kuat tekan beton geopolimer tanpa silica fumesebelum perendaman memiliki kekuatan rata-rata 23,65 MPa dan menurun setelah direndam dalam air danau sebesar 9,20 MPa menjadi 14,45 Mpa. Sedangkan kuat tekan beton geopolimer dengan penambahan 10% silica fume sebelum perendaman memiliki kekuatan rata-rata 11,82 MPa dan meningkat setelah direndam dalam air danau sebesar 6 MPa menjadi 17,80 MPa. Selain itu uji XRD juga dilakukan pada beton setelah perendaman untuk mengetahui unsur-unsur yang terbentuk pada beton ketika berada di lingkungan air danau. Hasil XRD menunjukkan adanya kandungan kuarsa dan microcline (KAlSi3O8) pada beton dengan penambahan 10% silica fume. Microcline sendiri memiliki nilai kekuatan yang baik pada skala Mohs yaitu sebesar 6 (orthoclase). Sedangkan hasil XRD pada beton geopolimer tanpa penambahan silica fumedidapatkan kandungan kuarsa, microcline(KAlSi3O8), calcite (CaCO3) dan CSH (Calcium Silicate Hydrate). Adanya kandungan calcite (CaCO3) dan CSH menunjukkan terperangkapnya udara pada beton dan juga perembesan air yang terjadi yang menyebabkan terjadinya reaksi hidrasi sehingga dapat menurunkan kekuatan beton geopolimer setelah perendaman.

Concrete is an important material and widely used in building construction. Therefore, the use of cement as concrete binder will also increase within the next few years. However, the release of Carbon Dioxyde during the production of cement can be harmful for environment. To overcome this difficulty, another material is needed to replacement. Geopolymer concrete is one of the alternative materials that can be used without any side effects towards environment. Cement is not used during the production of Geopolymer Concrete. Instead, Fly Ash is used as a binder because of its richness in Silica and Alumina and its capability to react with alkaline solution to produce a binder. The use of silica fume amounting to 10% of the mixture will also be observed on its effects towards the mechanical properties of geopolymer concrete that was submerged inside the fresh water lake for a month. Compressive strength tests using samples of cylindrical 15x30cm with curing for 72 hours at a temperature of 800C was performed to compare each samples of geopolymer concrete with difference in silica fume composition and different environmental condition. The compressive strength of geopolymer concrete without silica fume before immersion has an average of 23.65 MPa and decreased after immersion in water lake at 9.20 MPa to 14.45 MPa. While the geopolymer concrete compressive strength with the addition of 10% silica fume before immersion has an average power of 11.82 MPa and increased after immersion in water lake by 6 MPa to 17.80 MPa. XRD test was also conducted after submerging the geopolymer concrete to analyze elements that was formed when the concrete was being submerged inside the lake. XRD results showed the content of quartz and microcline (KAlSi3O8) in geopolymer concrete with the addition of 10% silica fume. Microcline itself has good hardness on the Mohs scale is equal to 6 (orthoclase). While the results of XRD on geopolymer concrete without the addition of silica fume content of quartz, microcline (KAlSi3O8), calcite (CaCO3) and CSH (Calcium Silicate Hydrate). The content of calcite (CaCO3) and CSH showed air trapping in the concrete and water seepage that occurs the causes of hydration reaction so as to reduce the strength of geopolymer concrete after soaking."
Depok: Fakultas Teknik Universitas Indonesia, 2015
S59709
UI - Skripsi Membership  Universitas Indonesia Library
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