#TITLE_ALTERNATIVE#

• Main Author: RULISTIANTO (NIM 13700036), FALDY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/10401
• Institution: Institut Teknologi Bandung

Considering some research which conducted to fly ash, it was found that fly ash has the pozzolanic properties with very fine grains. It can be used as additional material for concrete mixture with specific composition of cement weights ini order to increase the concrete quality in terms of strength, and resistance to sulfate attack. As a material in concrete mixture, the quality of fly ash must fulfil the chemical and physical requirements based on ASTM C 618-96.<p> <br /> <br /> <br /> <br /> <br /> <br /> <br /> This research used fly ash class F that generally low in lime (CaO), and contains more than 70% of combination on silica (SiO2), alumina (Al2O3), and iron (Fe2O3). Most of this amorphous silica and alumina acts as additive reactan either reductor for hexagonal crystalline Ca(OH)2/CH as by-product from hydration processes of calcium silicates in hydrous cement environment. This reduction is going to convert that hexagonal crystalline into colloidal network cluster of C3S2H8/C-S-H/calcium silicates hydrate which carry 75-80% of the concrete's total strength. Besides fly ash, rice husk ash was used as source of high amorphous silica.<p> <br /> <br /> <br /> <br /> <br /> <br /> <br /> The compositions of fly ash as subsitute for cement are 0, 5, 10, and 15% and every compositions added with 5% rice husk ash (except for 0%). The test of cylindrical specimen which cured with water and sulfate medium was conducted on compressive strength. As the result, maximum composition of fly ash as subsitute cement is 5% for both of curing medium.