Foamed concrete containing rice husk ash as sand replacement: an experimental study on compressive strength

[摘要] This study presents the utilization of rice husk ash (RHA) as sand replacement in foamed concrete. The study focuses on the effect of RHA on the compressive strength of foamed concrete. RHA contains high pozzolanic material that reacts with cementitious to enhance the strength and durability of foamed concrete. RHA also acts as filler causing the foamed concrete to become denser while retaining its unique low density. A total 243 cube specimens was prepared for the compression test. Two sets of mix design were employed at water-cement (W/C) ratio of 0.55, 0.60 and cement-sand ratio of 0.50, 0.33. The results revealed that the presence of RHA as sand replacement resulted in an increase in the compressive strength of foamed concrete. Moreover, 30% to 40% RHA was the optimum content level, contributing to the compressive strength of 18.1 MPa to 22.4 MPa. The W/C ratio and superplasticiser dosage play small roles in improving workability. In contrast, density governs the compressive strength of foamed concrete.

[发布机构] Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor; 86400, Malaysia^1;Jamilus Research Center, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor; 86400, Malaysia^2

[效力级别] 土木建筑工程

[关键词] Cementitious;Content level;Foamed concrete;Low density;Pozzolanic materials;Rice husk ash;Superplasticisers;Watercement (w/c) ratio