纳米Al2O3协同硅灰对水泥基材料性能影响试验研究  

Experimental Study on Effect of Nano-Al2O3 and Silica Fume on Properties of Cement-based Materials

作　　者：陈杰[1] 袁进科[1] CHEN Jie;YUAN Jin-ke(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,610059,China)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室成都理工大学,610059

出　　处：《混凝土与水泥制品》2020年第7期16-20,共5页China Concrete and Cement Products

基　　金：国家自然科学基金自主项目(41702318);四川省教育厅资助项目(18ZA0057);四川省国土资源厅资助项目(KS-2018-25);四川省科技计划资助项目(2019YJ0467、KJ-2018-20)。

摘　　要：利用超细致密体系原理,在水泥净浆中外掺硅灰和纳米Al2O3以改善普通硅酸盐水泥灌浆材料早期强度低、凝结时间长等性能。研究结果表明,单掺纳米Al2O3对强度提高不大,但加入碱性激发剂会促进纳米Al2O3的水化反应,提高早期强度,缩短凝结时间。此外,纳米Al2O3和碱性激发剂协同硅灰可以大幅提高早期强度,与净浆相比,复合浆体的1 d、3 d、7 d抗压强度最高提高了145%、132%、75%,凝结时间最高缩短了43%。Ordinary portland cement has the characteristics of low early strength,long setting time and low stone rate,therefore,using the principle of ultra-fine and dense system,silica ash and nano-Al2O3 were added to the cement paste to improve the mechanical properties of the cement matrix.The results show that the single-doped nano-Al2O3 has little improvement in strength.The addition of alkaline activator can promote the hydration reaction of nano-Al2O3,improve the early strength and shorten the setting time.In addition,the nano-Al2O3 and alkaline activator synergistic silica fume can greatly improve the early strength.The 1 d,3 d and 7 d compressive strengths of the composite paste are up to 145%,132%and 75%higher than those of the compressive strength of cement paste,the maximum reduction of the setting time is 43%.

关 键 词：纳米AL2O3 硅灰 力学性能 灌浆 改性 碱性环境 

分 类 号：TU528.04[建筑科学—建筑技术科学]