Laboratory Test on Sludge Solidification at the Bottom of Baiyangdian Lake

Abstract

Taking Baiyangdian lake bottom sludge as object, cement and gypsum as curing agent are used for solidifying through the laboratory test. The results show that the unconfined compression strength and bearing capacity of solidified soil increase with the increase of cement content when the ratio of plaster to cement and curing time are constant. The unconfined compression strength and bearing capacity of solidified soil with cement content of 10% and gypsum to cement ratio of 10% are the highest. The strength of solidified soil is basically stable on 7d.The strength of solidified soil of 14d (28d) is linear with that of 7d. The mean value of the ratio of unconfined compression strength on 14d ( 28d) to unconfined compression strength on 7d is 1.28 (1.29).The cohesive forces of solidified soil increases with the increase of cement content. When the cement content is constant, the law of the angle of internal friction is not obvious. The ultimate bearing capacity of ground determined by shear strength index is higher than that determined by unconfined compression strength index and the average values of the 14d (28d）ratio is 2.48(2.