Abstract
Rice husk ash (RHA) was employed as source material in geopolymer concrete in the presence of an alkaline activator, which was prepared by combining sodium hydroxide and sodium silicate. Fibre reinforcement was done with basalt fibres (B. F'S). Rice husk ash is rich in silica, and basalt fibres are rich in alumina; hence this combination proved to be more durable for rigid pavements. The sodium silicate (SST) to sodium hydroxide (SHD) ratio and the alkaline activator to binder content ratio were kept at 0.4 and 2.0, respectively, the sodium hydroxide concentration was kept as14 M, Superplasticizer (SZ) was used to improve the fluidity of geopolymer concrete, and the source material used was 500 kg/m3, in mix RHAM (rice husk ash mix). The percentages of B. F'S employed were 1, 5, 10, 15, 20, and 25% in combinations RHB1, RHB5, RHB10, RHB15, RHB20, and RHB25, and the results of BF'S mixes were compared to the control mix OPCM, which was prepared as for conventional Portland cement concrete of grade 40 with a water to cement ratio of 0.35. The results revealed that mix RHB10 had lesswater absorption as 1.54%, lesser weight loss for acid attack test as 27.43% only, chloride ion penetration depth as 2 mm, and 12 mm expansion after 28 weeks for sulphate attack. Compared to the control mix OPCM, RHAM also performed better in durability.
Published Version
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