Hasil Pencarian  ::  Simpan CSV :: Kembali

"Skripsi ini membahas tentang pengaruh pemakaian Portland Composite Cement (PCC) terhadap ketahanan sulfat pada Self Compacting Concrete (SCC). Pada penelitian ini dilakukan uji kuat tekan, kuat tarik belah, kuat lentur dan permeabilitas pada metode perendaman air suling, air laut kadar sulfat 0.2%, larutan magnesium sulfat 5%, dan larutan magnesium sulfat 5% pasang surut pada umur 28, 42, dan 56 hari. Dari hasil penelitian didapatkan bahwa semakin besar kandungan sulfat dan semakin lama perendaman dalam sulfat, maka kekuatan beton yang diperoleh semakin menurun dan penetrasi semakin besar. Karena beton sensitif terhadap sulfat. Besar persentasi penurunan kuat tekan, kuat tarik belah, kuat lentur berurutan pada perendaman air laut sebesar 2.92%, 2.56%, -8.04%, pada larutan magnesium sulfat 5% sebesar 3.86%, 7.51%, -2.68%, pada larutan magnesium sulfat 5% sistem pasang surut sebesar 9.66%, 18.09%, 24.11%. Besar persentasi peningkatan penetrasi pada perendaman air laut sebesar 6.41%, dan pada perendaman larutan magnesium sulfat sebesar 6.41%.

---

The focus of this study discusses about the effect of using Portland Composite Cement (PCC) to the sulphate resistance of Self Compacting Concrete (SCC). On this research, some tests were done to determine the concrete?s compressive strength, splitting tensile strength, flexural strength and permeability of the immersion method of distilled water, sea water with 0.2% sulphate concentration, magnesium sulphate solution 5%, and tidal of magnesium sulfate solution 5% at 28, 42, and 56 days. The result showed that the larger the concentrate of sulphate and the longer the immersion of the concrete in sulphate solution, the strength of concrete obtained decreases and the concrete penetration increases. This happens because concrete is basically sensitive of sulphate. The reduction rate of compressive strength, splitting tensile strength, flexural strength respectively in sea water immersion for 2.92%, 2.56%, -8.04%, in the solution of magnesium sulphate are 5% of 3.86%, 7.51%, -2.68%, while in the solution of magnesium sulphate 5% with tidal of 9.66%, 18.09%, 24.11%. The increasing rate of the concrete penetration for the samples immersed in sea water is 6.41%, while the increasing rate for the samples immersed in solution of magnesium sulfate is 6.41%."

"Cangkang kelapa sawit merupakan limbah hasil sektor pertanian yang memiliki potensi produksi yang tinggi namun belum dimanfaatkan secara maksimal di Indonesia. Penggunaan cangkang kelapa sawit sebagai pengganti agregat kasar pada beton telah banyak dilakukan. Dengan berat isi yang cukup ringan, cangkang kelapa sawit dapat menghasilkan beton ringan dengan berat jenis ±1900 kg/m3. Portland Composite Cemen (PCC) merupakan semen umum yang digunakan dipasaran. Semen ini memiliki butiran yang lebih halus sehingga menghasilkan panas hidrasi yang lebih rendah. Pada penelitian ini akan dilakukan studi eksperimen pada balok yang menggunakan cangkang kelapa sawit dari berbagai campuran jenis dan semen PCC sebagai pengikatnya. Pengujian yang dilakukan adalah uji kerakteristik beton (uji kuat tekan, kuat tarik belah, kuat lentur, permeabilitas, dan susut) serta pengujian pembebanan terhadap balok berukuran 300 x 15 x 25 cm3 menggunakan four-point loading serta pengamatan dengan metode Digital Image Correlation (DIC). Analisis yang dilakukan meliputi respon struktur balok akibat pembebanan, pola retak yang dihasilkan, serta bukaan retak yang terjadi selama proses pembebanan dilakukan. Hasil eksperimen menunjukkan karakteristik beton yang kurang memuaskan dimana hanya diperoleh kuat tekan sebesar 12,41 MPa. Balok beton bertulang cangkang kelapa sawit pada penelitian ini mampu menerima beban hingga 7000 kg. Pola retak yang terbentuk sudah sesuai dengan pembebanan yang dilakukan dan evolusi dari pembukaan retak yang diamati dapat terlihat dengan baik menggunakan metode DIC. Bukaan retak yang dihasilkan berkisar antara 100-300 μm. Meskipun menghasilkan respon struktur yang cukup baik, balok beton bertulang cangkang kelapa sawit tidak dapat dijadikan sebagai komponen struktural karena kecilnya kuat tekan yang dihasilkan. Perlu dilakukan penelitian lebih lanjut terkait dengan penggunaan cangkang kelapa sawit sebagai pengganti agregat kasar dalam campuran beton untuk komponen non-struktural.

---

Oil palm shells are agricultural waste with high production potential that has not been fully utilized in Indonesia. The use of oil palm shells as a replacement for coarse aggregates in concrete has been widely explored. With its relatively low density, oil palm shells can produce lightweight concrete with a density of approximately 1900 kg/m3. Portland Composite Cement (PCC) is a commonly used cement in the market. It has finer particles, resulting in lower hydration heat. This study aims to conduct experimental studies on beams using oil palm shells in various mixtures and PCC as the binder. The testing includes characterization of the concrete (compressive strength, splitting tensile strength, flexural strength, permeability, and shrinkage), as well as load testing on 300 x 15 x 25 cm3 beams using four-point loading and observation using Digital Image Correlation (DIC) method. The analysis includes studying the structural response of the beams under loading, crack patterns, and crack opening during the loading process. The experimental results indicate unsatisfactory characteristics of the concrete, as only a compressive strength of 12.41 MPa was obtained. The reinforced concrete beams with oil palm shells in this study can sustain loads up to 7000 kg. The crack patterns formed are consistent with the applied loading, and the evolution of crack opening can be well observed using the DIC method. The crack openings range from 100 to 300 μm. Although the beams exhibit satisfactory structural response, they cannot be used as structural components due to their low compressive strength. Further research is needed regarding the use of palm kernel shells as a substitute for coarse aggregate in concrete mixtures for non-structural components."

"ABSTRAKPembuatan beton daur ulang merupakan salah satu cara untuk memanfaatkan limbah beton. Limbah beton dapat digunakan sebagai pengganti agregat dalam jumlah tertentu. Namun, penggunaan agregat daur ulang pada campuran beton atau mortar berpengaruh terhadap sifat fisik maupun mekanik seperti menurunnya kuat tekan dan kuat lentur. Dalam penelitian ini, penulis memelajari pengaruh berbagai jenis semen pada mortar dengan agregat halus daur ulang sebanyak 20 terhadap kuat tekan, kuat lentur, susut dan absorpsi menggunakan 5 semen dengan merek berbeda sebagai variasinya yang selanjutnya diberi kode A, B, C, D dan E. Hasil penelitian menunjukkan bahwa mortar yang menggunakan semen D memiliki kuat tekan dan kuat lentur terbesar, yakni sebesar 29.2 MPa dan 4.6 MPa, dimana semen D memiliki kadar C3S terbesar. Pada pengujian susut, penyusutan tertinggi terjadi pada penggunaan semen A, yakni sebesar 0.1158 , sedangkan pada pengujian daya serap air hasil tertinggi didapatkan pada penggunaan semen B, yakni sebesar 96.22 g/cm2.

---

ABSTRAKThe utilization of recycled concrete is one of the way to reuse concrete waste. In certain amount, concrete waste can be utilized as the subtitution of aggregate. However, the use of recycle aggregate on concrete or mortar affects both physical and mechanical properties such as compressive strength and flexural strength decrease. In this study, the authors investigated the effect of various types of cement on mortar with 20 recycled fine aggregate on compressive strength, flexural strength, shrinkage and absorbtion using 5 different cement products which are coded as A, B, C, D and E. The results shows that cement D has the strongest compressive strength and flexural strength which amounted as 29.2 MPa and 4.6 MPa respectively where cement D has the highest levels of C3S. The shrinkage test shows that the highest shrinkage is shown on the usage of cement A which is 0.1158 while the highest water absorption test is shown on the usage of cement B which amounted 96.22 g cm2."

"High Performance Fiber Reinforced Cement Composites (HPFRCC) represent a class of cement composites whose stress-strain response in tension undergoes strain hardening behaviour accompanied by multiple cracking, leading to a high strain prior to failure. The primary objective of this International Workshop was to provide a compendium of up-to-date information on the most recent developments and research advances in the field of HPFRCC. Approximately 65 contributions from leading world experts are assembled in these proceedings and provide an authoritative perspective on the subject. Special topics include fresh and hardening state properties, self-compacting mixtures, mechanical behavior under compressive, tensile, and shear loading, structural applications, impact, earthquake and fire resistance, durability issues, ultra-high performance fiber reinforced concrete, and textile reinforced concrete. "