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Abstrak :
Geopolimer concrete in the world of sustainable construction is not as popular as Portland concrete Because it doesn rsquo t have fixed mix design yet The goals of the this research are the mix design with strength of K225 K300 dan K350 by seeing the compressive strength dan flexural strength by 80 C curing The result age of this concrete is 7 days and it has been obtained high strength and flexural strength form the SNI.

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Beton geopolimer dalam dunia konstruksi ramah lingkungan belum sepopuler dari beton Portland Karena belum memiliki desain campuran yang pasti Tujuan dilakukan penelitian ini adalah untukmencari desain campuran dengan kekuatan K225 K300 dan K350 dengan melihat kuat tekan dan kuat lentur dengan dilakukan curing pada suhu 80 C Hasil yang didapat melalui penelitian ini dengan umur 7 hari mendapatkan hasil kuat tekan kuat lentur yang lebih baik dari SNI.

Abstrak :
The addition of alumina and wollastonite in geopolymer resin is expected to increase the thermal behavior of the geopolymer matrix composite. In this work, fine granules of solid alumina and acicular wollastonite used as filler were mixed with a fly ash-based geopolymer resin paste to form a composite matrix. The filler additions were 2.5% to 10.0% of the total weight with sodium silicates and sodium hydroxide used as activators. The results showed that the addition of alumina and wollastonite as filler did not have much effect on the flexural and compressive strength of the geopolymer matrix composite at room temperature. Wollastonite fiber, which was added in the form of a short-sized fiber, only produced a very small bridging effect. Nevertheless, alumina filler composite showed a good result after being exposed to a temperature at 200°C, although the strength was reduced as the temperature increased. Moreover, wollastonite fibers only managed to maintain 50% of their flexural strength after 2 hours exposure at a temperature of 200°C due to the damage of the wollastonite fiber.

Abstrak :
The effect of steel slag substitution as coarse aggregate on compressive strength in fly ash based-geopolymer concrete was studied. The compressive strength was evaluated by measuring the maximum acceptable load using compression testing equipment. Compressive strength depends on several factors, such as time and temperature of curing and the mixing proportion. The compressive strength of geopolymer concrete with steel slag substitution was higher compared to geopolymer concrete with gravel aggregate. The optimum compressive strength was found on the third day of curing at a temperature of 60oC for both the geopolymer concrete with steel slag substitution and normal geopolymer concrete. Reinforcement corrosion was evaluated by measuring the corrosion current density using a linear polarization potentiostatic scan. The corrosion rate of reinforcing steel in geopolymer concrete with steel slag substitution was found to be higher compared to normal geopolymer concrete without steel slag in seawater medium, whereas in an acid rain environment, steel slag substitution increased corrosion resistance. The corrosion rate of geopolymer concrete with steel slag substitution was found to be lower compared to normal geopolymer concrete. The corrosion rate was found to be very high at an early stage and decreased with time.

Abstrak :
Kondisi lingkungan saat ini mendorong para peneliti untuk mencari teknologi yang berkelanjutan serta material yang lebih ramah lingkungan untuk mengatasi pengurangan sumber daya alam. Perkembangan desain bata interlocking yang paling cocok dan mudah dipakai agar saling mengunci satu sama lain saat disusun merupakan salah satu upaya untuk menggantikan penggunaan bata yang beredar di pasaran dengan cara mengurangi penggunaan mortar dalam konstruksi. Desain bata interlocking telah diuji agar saling mengunci telah disusun dengan tonjolan dan lekukannya memiliki perbedaan diameter sebesar 1 mm dimana bagian tonjolan memiliki diameter 1 mm lebih kecil disbanding lekukannya. Cetakan untuk produksi bata interlocking diuji menggunakan cetakan hasil 3-D printing dan cetakan silikon dimana cetakan silikon menunjukkan hasil proses pelepasan yang lebih mudah. Penggunaan mortar geopolimer pada bata interlocking yang telah didesain juga merupakan upaya untuk meningkatkan kesadaran akan material ramah lingkungan yang dalam hal ini menggunakan terak nikel sebagai pengganti semen. Material yang dipilih sebagai bahan pembuat bata interlocking adalah geopolimer berbasis terak nikel hasil penelitian dari Rama Aditya Syarif yang menghasilkan mortar geopolimer dengan kuat tekan dalam rentang 36 - 58 Mpa pada umur 28 hari, dengan laju absorpsi sebesar 20.7%. ......The current environmental conditions urge researches to find sustainable and affordable technologies and more environmentally friendly material to overcome the depletion of natural resources. The development in finding the most suitable and easiest design of interlocking brick to fit when stacked dry one another is one of the effort to replace the use of common bricks by reducing the use of mortar in the construction. The design of interlocking brick is tested to fit when stacked upon the other interlocking brick with the bulges and the indentations having 1 mm diameter differences in which the bulges have 1 mm smaller diameter. The mold for interlocking brick production is tested using 3-D printing interlocking brick mold made from PLA polymer and silicon mold which results in the better removal process using the silicon mold. The use of geopolymer mortar in the designed interlocking brick will raise the awareness of environmentally friendly material that in this case use nickel slag instead of cement. The material chosen as an interlocking brick material is geopolymer made from nickel slag based on research from Rama Aditya Syarif, which produces geopolymer mortar with compressive strength in the range of 36-58 MPa at the age of 28 days, with absorption rate of 20.7%.