Open AccessExperimental Study on The Effect of Cement-Lime Double Admixture on Dewatering and Strength of Sludge
Author(s) -
Peng Cheng,
Zongkun Tian,
Yuqing Tan,
Hui Long
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/304/5/052073
Subject(s) - lime , dewatering , dehydration , cement , curing (chemistry) , water content , materials science , compressive strength , pulp and paper industry , cohesion (chemistry) , waste management , geotechnical engineering , composite material , metallurgy , chemistry , geology , biochemistry , organic chemistry , engineering
Cement and lime are mixed into the sludge in different ratios to analyze the effect of curing agent on sludge dewatering and the dehydration rate, improve the strength of sludge, and promote the application of sludge in water conservancy and geotechnical engineering. The solidified sludge was subjected to test of moisture content and direct shear test to study the dewatering effect and strength characteristics of the improved soil. It was found that the precipitation and dehydration rate of solidified sludge were related to the ratio of curing agent incorporation. The higher the incorporation ratio is, the more obvious the dehydration effect is, and the maximum reduction value of dehydration is 13%. The sample’s dehydration rate is from the large to the small, and the average precipitation rate of 0-12h is 2-6 times than that of 12-72h. With the increase of the dosage of curing agent, the cohesion of solidified soil increases obviously, and its range of variation is between 32 and 77kPa. The internal friction angle of the sample increases with the increase of cement content, but fluctuates slightly under the action of lime. After comprehensive consideration of dehydration effect, shearing strength parameters and economic benefits, the optimal ratio of cement and lime to modified sludge soil can be controlled at 10% and 10%, respectively.