水泥土添加剂的室内试验  

Test on Additive of Cement-Soil in Laboratory

作　　者：叶观宝[1] 陈望春 徐超[1] 李束[1] 

机构地区：[1]同济大学岩土工程重点实验室 [2]中国民航机场建设集团公司,北京100101

出　　处：《中国公路学报》2006年第5期12-17,共6页China Journal of Highway and Transport

基　　金：上海市重点学科建设项目(2001-44);江苏省交通厅科研项目(03Y023)

摘　　要：通过分别对加有SN-Ⅱ高效减水剂、Al(OH)3和CaCl2早强剂以及不加添加剂的水泥土进行7、28、90 d龄期的微观结构分析试验,结合无侧限抗压强度试验,研究水泥土添加剂的作用机理。结果表明:添加剂SN-Ⅱ的宏观力学性质表现为水泥土28 d强度有明显提高,添加剂Al(OH)3和CaCl2的宏观力学性质表现为水泥土7、28、90 d强度均有明显提高。微观结构分析表明:添加剂SN-Ⅱ不参与水泥土的水化反应,对水泥土的影响主要体现在改变水化速度和水化产物空间结构上;添加剂Al(OH)3和CaCl2既参与水泥土水化反应,又可改变其水化速度和空间结构。The effect mechanism of additive in cement-soil was discussed through microstructure analysis test combined with unconfined compression test at age of 7,28, 90 d. High effective water reducing agent SN-Ⅱ , early strength agent Al（OH）2 and CaCl2 were chosen as additive. The results indicate that with the additive of Al（OH）a and CaCl2, the strengths of the specimens increase significantly on all the three curing dates, while in case of specimens with only SN-Ⅱ added, just the 28 d strength increases. Microscopic analysis indicates that SN-Ⅱ influences primarily the speed of the hydration and the spatial structure of the hydration products rather than attends the reactions. On the contrary, Al（OH）3 and CaCl2 not only participate the reactions, but also influence the speed of the hydration and the spatial structure of the hydration products.

关 键 词：道路工程 水泥土添加剂 试验研究 无侧限抗压强度 能谱分析 X射线衍射 

分 类 号：U416.03[交通运输工程—道路与铁道工程]