A Comparative Study on the Effect of Class C and Class F Fly Ashes on Geotechnical Properties of High-Plasticity Clay

CivilEng

Salar Shirkhanloo¹  Mohammad Najafi¹  Vinayak Kaushal¹  Mehrdad Rajabi² 

[1] Center for Underground Infrastructure Research and Education (CUIRE), Department of Civil Engineering, The University of Texas at Arlington, Box 19308, Arlington, TX 76019, USA;Department of Civil Engineering, Islamic Azad University, Tehran Science and Research Branch, Tehran 1477893855, Iran;

关键词: soil stabilization;    fly ash;    clayey soil;    high plasticity;    geotechnical properties;   

DOI  :  10.3390/civileng2040054

来源: DOAJ

【 摘 要 】

Clays generally have a low strength and capacity, and additives are usually used to stabilize them. In recent years, using fly ash to stabilize soil has decreased environmental pollution while also having an economic benefit. The objective of this study is to perform a comparative investigation on the effect of class C and class F fly ashes on geotechnical properties of high-plasticity clay using the Atterberg’s limit, compaction, California Bearing Ratio (CBR), and unconfined compressive strength tests. The results showed that with an increase in the amount of fly ash, there was a decrease in the maximum dry density and an increase in the optimum moisture content. Moreover, an addition of fly ashes of up to 25% caused a reduction of the liquid limit and plasticity index, and an increase in the maximum unconfined compressive strength and CBR. Lengthening the curing time had a positive impact on the unconfined compressive strength of the soil. The soil samples with class C fly ash were seen to possess more efficient geotechnical properties as compared to class F fly ash.

【 授权许可】

Unknown