Influence of Rice Husk Ash on Sub-Grade Bearing Strength in Stabilization of Expansive Soils for Low Volume Roads in Kenya

Catherine Mugai, Benedette Sabuni, E. Neyole, Faith Mugai
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Abstract

The cost of cement and lime used in stabilizing soils can be reduced by using locally available rice husk ash which is known to contain pozzolanic properties. This paper studies the variations in sub-grade bearing strength of clay when rice husk ash (RHA), lime and cement are added in varying proportions. Chemical analysis was first carried out to establish the silica content in the RHA. CBR test was conducted to establish the strength properties of the various soil mixes. RHA was used as the main stabilizing agent added at varying proportions of 0%, 5%, 10%, 15% and 20%. Lime and cement proportions were constant in each batch but varied across the six batches as 0%, 2% lime, 4% lime, 6% lime, 1.5% cement and 2% cement. The test results show that RHA in combination with lime can be used as an economic and eco friendly stabilizing agent giving a significant improvement in the sub-grade bearing strength of cotton soil. Keywords: key words, Rice Husk Ash (RHA), California Bearing Ratio (CBR), Sub-grade, Lime, Cement DOI: 10.7176/CER/12-11-04 Publication date: November 30 th 2020
稻壳灰对肯尼亚小体积公路膨胀土稳定地基承载强度的影响
水泥和石灰用于稳定土壤的成本可以通过使用当地可用的稻壳灰来降低,稻壳灰已知含有火山灰性质。研究了稻壳灰、石灰和水泥不同掺量对粘土路基承载强度的影响。首先进行化学分析以确定RHA中的二氧化硅含量。通过CBR试验确定了不同混合土的强度特性。以RHA为主要稳定剂,添加比例分别为0%、5%、10%、15%和20%。石灰和水泥的比例在每批中都是恒定的,但在6批中分别为0%、2%石灰、4%石灰、6%石灰、1.5%水泥和2%水泥。试验结果表明,RHA与石灰复合可作为一种经济、环保的稳定剂,显著提高棉花土的路基承载强度。关键词:稻壳灰分(RHA),加州承载比(CBR),路基,石灰,水泥DOI: 10.7176/CER/12-11-04
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