Compressive strength, Water Abortion and Length Change of Concrete Block Made from Alkali Activated Fly Ash
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Abstract
This research aims to study the properties of concrete block made from alkali activated fly ash to use as cementitious material without Portland cement. Sodium hydroxide and sodium silicate solutions were used as an alkaline solution in the mixture of alkali activated fly ash. The compressive strength of concrete block was determined at 7, 14 and 28 days. The water absorption and change in length after immersed in water were also investigated at 28 days. The result found that the compressive strength of concrete block made from alkali activated as a cementitious material was increased with curing age. The using of sodium hydroxide combined with sodium silicate solution (FA-6M-NS concrete) was achieved the highest compressive strength, which could be developed compressive strength up to 249 kg/cm2 at 28 days. The test results of water absorption and length change when immersed in water of concrete block made from alkali activated fly ash were ranging from 9.4 - 10.5 % and 0.12 - 0.33 %, respectively. Moreover, the concrete block made from alkali activated fly ash had significantly less release CO2 emission than that of concrete using Portland cement as binder, which was eco-friendly material when compared with CO2 emission obtained from raw materials.
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