Experimental analysis of engineering properties of solidified sludge as roadbed filling material
Ding Hui , Sun Xiuli
,
Liu wenhua
,
Zhang Zhichao
,
Zhang wei
,
Song biying
DOI:10.11835/j.issn.1674-4764.2017.02.002
Received June 27, 2016,Revised , Accepted , Available online July 04, 2017
Volume ,2017,Pages 11-18
- Abstract
To discuss the feasibility of using the fly ash and industrial slag solidified dredged sluge as roadbed material, a series of laboratory tests were performed to investigate the effect of curing agent ratios on the compaction properties, water stability, bearing capacity and shear strength. The test results showed that the maximum dry density of the solidified sludge with different curing agent ratios are higher than 1.50 g/cm3, and the optimum moisture content are about 20%~21%. The soaking induced expansion rate with the soaking time of 4 days are less than 1.1%, which indicates the water stability are ameliorated after solidification. With the decrease of fly ash and the increase of mineral powder, the CBR(California bearing ratio) and the shear strength are greatly increased. The solidified sludge with different curing agent ratios have high CBR after soaking for 4 days. The sample of SD10FA20MP has the highest CBR (34.8), which is 4.35 times of lowest requirement of roadbed filling of highway. It is concluded that it is feasible to use the fly ash and industrial slag solidified dredged sludge as roadbed filling material.