Investigating the Suitability of Coconut Husk Ash as a Road Soil Stabilizer

International Journal of Technology

卷:10

Aper E Zava¹  Ibrahim Tunde Yusuf² 

[1] Department of Civil Engineering, University of Agriculture Makurdi, Makurdi, Nigeria;

[2] Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria;

关键词: California bearing ratio;    Coconut husk ash;    Compaction characteristics;    Lateritic soil;    Pozzolanic material;    Unconfined compressive strength;   

DOI  :  10.14716/ijtech.v10i1.882

来源: DOAJ

【 摘 要 】

There is a pressing need to locate cheaper alternatives to traditional stabilizers such as Portland cement and lime which will reduce the cost of stabilized roads and make the practice of treating local soil materials very attractive to road development agencies in poor countries of the underdeveloped world, where deficient soils are often used without treatment, the consequence of which is premature deterioration of roads. This paper presents a study that was conducted to investigate the suitability of coconut husk ash (CHA), a waste product from crop plants, as a road soil stabilizer. The oxide composition of CHA was determined to establish its suitability as a pozzolanic material. It was then mixed with a lateritic soil (classified as A-2-6(1) using the AASHTO system of soil classification) in varying proportions, ranging from 0–20% by dry weight of soil at increments of 2%. The physical and strength properties of each of the soil-CHA blends was then determined in the laboratory. The results show that oxides of K2O, SiO2, Cl, CaO, P2O5, MgO and Al2O3 constitute 92% of CHA, indicating that it is a pozzolanic material. The optimum moisture content (OMC) of the soil increased, while its maximum dry density (MDD) decreased, with increasing CHA content. The CBR and UCS of the mixes increased with CHA content up to 8%, but decreased with a further increase in CHA content. However, the increase in the strength of the soil obtained at the optimum CHA content was not significant enough to warrant its usage as a lone stabilizer for sub-base and base materials, but it can be used for subgrade stabilization. For sub-base and base stabilization, CHA should be admixed with conventional stabilizers for improved performance.

【 授权许可】

Unknown