自密实生土基改性材料的强度发展规律研究  

Experimental study on strength development rules of self-compacting soil-based walls

作　　者：马聪[1] 杜骁[2] 陈兵[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院安全与防灾工程研究所,上海200240 [2]上海交通大学招投标管理办公室,上海200240

出　　处：《新型建筑材料》2016年第1期10-13,共4页New Building Materials

基　　金：国家自然科学基金项目(51378309)

摘　　要：以原状黄土为基料,选用高效固化剂混掺粉煤灰作为胶凝材料,制备了自密实生土基改性材料,测试了改性材料在不同龄期的无侧限抗压强度,得出了基于早期强度测试结果的中后期强度预测模型。结果表明:生土基改性材料的自密实特性可通过调节水固比及减水剂用量获得;水固比与固化材料掺量能显著影响改性材料各龄期的抗压强度,抗压强度在28 d后仍能保持持续增长;对数模型可较好地描述改性材料抗压强度随龄期的发展规律,得到的关系式具有较高的相关系数;借助基于7 d抗压强度为参数的强度预测模型,可以预测改性材料不同龄期的抗压强度,其相关系数大于0.95。Undisturbed loess was used as filler to prepare self-compacting soil-based material in this study,and a type of high-efficiency clay stabilizer was used as cementing material. The unconfined compressive strengths of self-compacting soil-based material at different ages were tested. Furthermore,the predicted models for middle and long term compressive strength were obtained on the basis of early-term strength. The experimental results indicate that the property of self-compacting can be achieved by regulating the water-solid ratio and superplasticizer content. The compressive strength of soil-based material can be influenced by the water-solid ratio and stabilizer content significantly,and it also increases beyond 28 days of curing. The logarithm model can be used for analyzing the development of compressive strength with curing time,and it has good coefficients of association. The compressive strength at different curing time can he predicted by the predicted medeis from 7-day strength,the correlation coefficient is larger than 0.95.

关 键 词：生土基改性材料 自密实 强度发展 强度预测 

分 类 号：TU521.3[建筑科学—建筑技术科学]