Abstract

Rice husk ash (RHA) is an agricultural by-product obtained from incineration of abundantly available rice husk (RH) which can be used as a substitute for cement. In this study, RHA up to 30% has been utilized as partial replacement of cement by weight along with fly ash as one of the components in self-compacting concrete (SCC). Experimental programs were conducted to evaluate the fresh properties of SCC. Strength properties i.e. compressive strength, splitting tensile strength, and durability properties such as sorptivity, water absorption & porosity, rapid chloride permeability test (RCPT), sulphate resistance were also evaluated up to the age of 365 days. It was found that the inclusion of RHA up to 15% had a positive effect on strength properties while durability properties improved significantly at all replacement levels of RHA. The compressive strength results were verified with microstructure analysis using scanning electron microscope (SEM). Moreover, it was observed that material cost savings of up to 18% can be achieved by using up to 30% of RHA along with reduction in the carbon footprint and embodied energy. Multi linear regression models were established to predict the strength and durability properties at different curing ages and replacement levels of RHA.

摘要

稻壳灰 (RHA) 是一种农业副产品，通过焚烧大量可用的稻壳 (RH) 获得，可用作水泥的替代品。在这项研究中，高达 30% 的 RHA 与粉煤灰一起作为自密实混凝土 (SCC) 的成分之一被用作部分替代水泥。进行了实验程序以评估 SCC 的新鲜特性。强度特性，即抗压强度、劈裂拉伸强度和耐久性特性，如吸水性、吸水性和孔隙率、快速氯化物渗透测试 (RCPT)、耐硫酸盐性，也被评估到 365 天。发现添加高达 15% 的 RHA 对强度性能具有积极影响，而在所有 RHA 替代水平下，耐久性性能均显着提高。使用扫描电子显微镜（SEM）通过微观结构分析验证了抗压强度结果。此外，据观察，通过使用高达 30% 的 RHA 以及减少碳足迹和隐含能源，可以实现高达 18% 的材料成本节省。建立多元线性回归模型来预测不同固化年龄和RHA更换水平下的强度和耐久性性能。