Compressive strength of cement stabilized fly ash-soil mixtures

Rajghat fly ash from Delhi, India, and Baumineral fly ash near Bochum, Germany, were mixed with the locally available soils-silt and Yamuna sand with Rajghat fly ash and Rhine sand with Baumineral fly ash-in different proportions. Cement. varying from 3-9% was added to stabilize the fly ash-soil mixtures. Cylindrical samples were prepared at optimum moisture content and maximum dry density and were cured for different duration. Unconfined compression tests were conducted on these samples. Correlations for unconfined compressive strength and secant modulus as functions of curing time, fly ash content, and cement content have been established. The data were analyzed with other correlations recommended in literature and comparisons between the correlations have been made. Correlations for water content as functions of curing time and cement content have also been established. (C) 1999 Elsevier Science Ltd. All rights reserved.