Abstract
Abstrak. This study aims to determine the effect of rice husk ash (RHA) as an ingredient added to mortar to the setting time and compressive strength of mortar. The article also studies about the effect of the sulfuric acid solution on the setting time and compressive strength of mortar. Quantitative research using an experimental approach to making mortar samples at various RHA levels is 0%, 3%, 6%, 9% and 12%, each of the 16 test objects. The mortar properties tested setting time and compressive strength. The results of the analysis show that the using of RHA in mortar production caused the shorter of setting time. The compressive strength of mortar at 6% variation produces optimal results. The compressive strength of ordinary mortar at 28 days was 6 MPa, while the maximum compressive strength of 6% variation was 6.25 MPa. The use of pH4 a water causes differences in setting time and mortar compressive strength. The acidity of the mixing water causes the cement to bind faster but causes a decrease in the compressive strength of the mortar.
Highlights
The construction industry in Indonesia is developing along with the development of science and technology
This study aims to determine the effect of rice husk ash (RHA) as an ingredient added to mortar to the setting time and compressive strength of mortar
The results of the analysis show that the using of RHA in mortar production caused the shorter of setting time
Summary
The construction industry in Indonesia is developing along with the development of science and technology. One proof of the progress of the construction industry is the optimal use of materials in economic aspects. There are various efforts to utilize waste material as a primary material for composing concrete. One such waste material is rice husk ash (RHA) as a residual material in rice production. Indonesia as an agrarian country where the majority of the population make rice as a staple food, and rice production is evenly distributed throughout the homeland. Rice production in 2015 amounted to 75.40 million tons of dry grain or increased by 4.55 million tons (6.42%) compared to 2014.
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