Improvement of Earth Canals Constructed on a Gypseous Soil By Cement

Abstract

Gypseous soil is a collapsible soil ) problematic soil) ,  it supports heavy loads in a natural water content, but with increased water content, they undergo a significant reduction in volume that's belong to dissolve of gypsum content .Many  research works have been done to investigate the behavior of these  soils. All these works indicated that the use of additives can significantly reduce the settlement and corrosion of soils.

This research presents the results of an experimental study for treating soil. The soil was brought from Karbla Governorat of gypsum content (42.55%). Many tests were employed on treated and untreated soil. Different water cement ratio (W/C) with different curing time used to investigate the best ratio of cement and the minimum curing time which decreased the collapsibility of earth canal with a gypsums soil. The effect on improvement of gypsums soil was made by using two percentages (5, 10) % by volume with three ratio of water to cement ( W/C ) of  (2, 3, 4)% ,  a mixture sprayed above compacted soil. The results marked that (2) % of water to cement ratio in both percentage of volume (5 % ,10%) decreases the collapsibility sharply with curing time 14 days.