| dc.description.abstract | Cement, coarse aggregate, fine aggregate, and water are mixtures of concrete in which besides
water, the rest of the components are not sustainable. The utilization of waste-material as an
alternative additives or replacement of cement and aggregates becomes the research areas to
seek solution for more sustainable materials. In Indonesia, the availability of waste materials
such as fly ash and dolochar that can be processed as material alternative can be found in the
area of Tanah Laut, South Kalimantan, at PLTU Asam Asam. The objective of this study is to
explore the potential of fly ash and dolochar in replacing coarse aggregates. The methodology
for the first phase of this study is started by surveying and laboratory testing including aggregate
testing, cement testing, and chemical composition using X-ray Fluorescence (XRF). The results
of this study show that fly ash from PLTU Asam Asam can be used as material alternative to
replace cement since it contains pozzolanic and cementitious properties. Chemical composition
of fly ash has passed the requirement such as the percentage of (Al2O3 + SiO2 + Fe2O3) is between
79,26%-91,54% that is higher than 70%, the percentage of SO3 is between 0,46%-0,62% and
lower than 4%, and the percentage of MgO is between 2,08%-5,18% that is lower than the
requirement of 6%. As for dolochar, it can replace fine aggregate when the size smaller than 5
mm at SSD (Saturated Surface Dry) condition is used. Meanwhile, dolochar with a size larger
than 5 mm can be used as material alternative to replace coarse aggregate. The research
concludes that fly ash and dolochar has potentials to be used as material alternative in the
concrete industry, to support a more sustainable construction material. | en_US |
