Abstract
Rice husk ash (RHA) is an agricultural residue and has shown great potential for soil stabilization. However, the research on the utilization of RHA for soft soil improvement using cement deep mixing method is still limited and the efficiency of using different RHA types for soil improvement needs to be clarified. In this study, the effect of different RHA types on Atterberg limits, unconfined compressive strength (UCS), and elastic modulus (E50) of soil-cement mixtures will be investigated. Two types of RHA which obtained from open fire burning (RHA1) and burning in a furnace under controlled conditions of temperature and duration of burning (RHA2), were used for this study. The RHA contents from 0 to 15% and 10% cement of the dry weight of the soil were used to treat the soft soil. The research results show that the types of RHA insignificantly affect the change in Atterberg limits of cement-admixed soil. Regarding the soil strength, the RHA2 shows a higher efficiency in the enhancement of treated soil strength at 28 days of curing than the RHA1. The addition of 12% RHA2 to the cement-admixed soil can increase the UCS and E50 values of treated soil by more than 50%.
Highlights
The use of industrial and agricultural wastes such as fly ash, steel slag, blast furnace slag, rice husk ash (RHA), wood ash, and bagasse ash in civil engineering applications is one of the great interests and has received much attention from the literature (e.g., James and Pandian, 2016; Jayanthi and Singh, 2016; Kuntikana and Singh, 2017 and Varaprasad et al, 2020)
The tendency of liquid limit (LL) and plasticity limit (PL) after adding RHA to soil-cement mixtures observed in this study is similar to that after adding cement or RHA to soil observed in previous studies (Basha et al, 2005)
The plasticity index (PI) of soil treated with cement and RHA1 decreases from 41.2 to 35.3%, while that of soil treated with cement and RHA2 decreases from 41.2 to 35.5%
Summary
The use of industrial and agricultural wastes such as fly ash, steel slag, blast furnace slag, rice husk ash (RHA), wood ash, and bagasse ash in civil engineering applications is one of the great interests and has received much attention from the literature (e.g., James and Pandian, 2016; Jayanthi and Singh, 2016; Kuntikana and Singh, 2017 and Varaprasad et al, 2020) The utilization of these wastes could reduce the amount of landfilled, replace natural aggregates such as sand, gravel or even conventional Portland cement as well as reduce the construction cost. It is necessary to increase the utilization of this waste in civil engineering application to reduce the negative effect on the environment and reduce the construction cost as well
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