Experiments on pavement performance of solidified sediment modified with cement
ZHANG Jun feng1, DAI Xiao song2, ZOU Wei lie3, XU Shun ping2, LI Zi you4
1. Country Garden Holdings Company Limited, Shunde 528311, China, 2. Investment development Company LimitedCCTEB, Wuhan 430070, China; 3. College of Civil Engineering, Wuhan University, Wuhan 430072, China; 4. Central Southern Geotechinical Design Institute Company Limited, Wuhan 430072
A kind of complex Portland cement (PC32.5) was used to modify the pavement performances of dredged sludge from East Lake of Wuhan combined with the technology of integrated approach for dehydrated consolidation of desilting slurry. A serious of laboratory tests were conducted to investigate the influence of the degree of compaction, cement content and curing period on the deformation behavior of strength, compressibility and water stability of modified solidified sediment (MSS). Results indicate that the optimum water content and maximum dry density of the MSS are a little less than those of the SS. California Bearing Ratio (CBR), unconfined compression strength (qu), and compression coefficient (a1-2) of the MSS have obviously increment in the first 7 days of curing period, thereafter CBR and qu continue to increase, but their amplifications gradually decrease. The influences behavior of cement content on both CBR and qu exist the inflection point phenomena, i.e., the rates of increase of both CBR and qu are less after the cement contents exceed their own inflection points (4% and 2%, respectively). The compression coefficient of MSS was independent on curing period and cement content. Both degree of compaction and cement content can slightly improved the water stability of MSS, and extending the curing period of MSS showed more effective improvement. Scanning electronic mission (SEM) pictures of SS and MSS were adopted to explain the mechanism of cement improving pavement performance of SS.
ZHANG Jun feng, DAI Xiao song, ZOU Wei lie, XU Shun ping, LI Zi you. Experiments on pavement performance of solidified sediment modified with cement. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(11): 2165-2171.
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