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| 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 |
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Abstract 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.
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Published: 01 November 2015
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水泥改性固化脱水淤泥路用性能试验
针对无法用作路基填料的对武汉东湖疏浚淤泥，结合专利技术“清淤泥浆脱水固结一体化处理方法”，采用PC32.5复合硅酸盐水泥进行改性处理.考虑压实度、水泥掺量、养护龄期等主要影响因素，通过一系列室内试验，研究水泥改性固化土强度、压缩性和水稳定性随影响因素的变化规律.试验结果表明，改性固化土的最优含水率和最大干密度较固化土稍有降低，加州承载比（CBR）、无侧限抗压强度qu、压缩系数a1-2在养护初期（7 d）较固化土已有显著的增加，随着养护龄期的延长，CBR、无侧限抗压强度继续增大，但增幅逐渐减小；水泥掺量对CBR、无侧限抗压强度的影响都存在明显的拐点（分别为4%和2%），超过拐点后，各指标的增长率较小；养护龄期、水泥掺量的增加并不能引起压缩系数a1-2的明显降低；提高压实度和水泥掺量对改性固化土的水稳定性均有改善作用，但经济性差，而延长养护龄期有更明显的效果.结合扫描电镜图像，对水泥改善固化土性能的机理进行分析.
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