Evaluation of the Use of Fine Aggregates of Quartz Sand and Fly Ash in Geopolymer Concrete Based on Potassium Hydroxide Binder on the Compressive Strength and Absorbency of Concrete
DOI:
https://doi.org/10.32722/pt.v23i1.6037Abstract
The development of concrete construction has the impact of increasing cement production and
damaging the balance of nature because every 1kg of cement production produces CO2 emissions
of 0.5 - 0.7 kg. To reduce this iMPact, geopolymer concrete innovation was formed. Geopolymer
concrete is formed from the polymerization reaction of silica (Si) and alumina (Al) compounds
found in quartz sand and fly ash waste from burning coal which has binding properties like cement.
Fly ash reacts with alkaline activators of potassium hydroxide (KOH) and sodium silicate
(Na2SiO3). The research method used is a quantitative method with experimental studies in the
laboratory. Geopolymer concrete mix design refers to previous research. Geopolymer concrete test
objects are cylindrical with a size of 100 x 200 mm. There are 2 variations of the composition of
alkali activator forming geopolymer concrete, namely 8M KOH concentration, alkali activator
ratio of 1:1 mol ratio and 10M KOH, alkali activator ratio of 1:1.5 mol ratio. The composition of
fly ash and quartz sand for each binder was 20%:80%, 40%: 60%, 50% : 50%, 60% : 40%,
80%:20% with a total of 36 samples. Testing compressive strength and absorption at the age of 14
and 28 days. The results of the compressive strength obtained ≤ 50 MPa where the concrete does
not include high quality concrete and not for the needs of precast construction. The results of
average concrete absorption reached 3,72%, which already met the permissible absorption of a
maximum of 10%.
Keywords: Fly Ash, Quartz Sand, Potassium Hydroxide, Geopolymer Concrete.
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