| 纳米二氧化硅对活性粉末混凝土力学性能影响的试验研究 |
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| 引用本文： | 刘丹,杜应吉,史凯方. 纳米二氧化硅对活性粉末混凝土力学性能影响的试验研究[J]. 中国农村水利水电, 2011, 0(12) |
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| 作者姓名： | 刘丹 杜应吉 史凯方 |
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| 作者单位： | 西北农林科技大学水利与建筑工程学院,陕西杨凌,712100 |
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| 基金项目： | 国家“十一五”科技支撑计划重点项目(2006BAD11-B03) |
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| 摘 要： | 活性粉末混凝土（RPC）是一种具有超高力学性能的新型水泥基复合材料，根据最大密实度理论配制而成。纳米SiO2比RPC中各成分的粒径都小，不但可以进一步物理填充其微小空隙，而且具有很高的火山灰活性。通过考虑水胶比、硅灰掺量、矿渣掺量三个因素，采用L9（3^4）正交设计，确定出RPC的基准配合比，再添加不同掺量的纳米SiO2，通过分析7d和28d的强度值，发现当纳米SiO2的掺量为0．5％～1％时，提高了RPC的抗折强度、抗压强度和劈拉强度。同时结合电镜扫描，发现纳米SiO2使水泥基体水化反应更加充分，并且改善了界面结构，降低了浆体的结构缺陷，从微观方面说明了纳米SiO2提高其力学性能的机理。
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| 关 键 词： | 活性粉末混凝土 纳米SiOz 正交设计 力学性能 微观分析 |
Research on the influence of the Reactive Powder Concrete Mechanical Properties by Nano-Silica |
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| LIU Dan,DU Ying-ji,SHI Kai-fang. Research on the influence of the Reactive Powder Concrete Mechanical Properties by Nano-Silica[J]. China Rural Water and Hydropower, 2011, 0(12) |
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| Authors: | LIU Dan DU Ying-ji SHI Kai-fang |
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| Affiliation: | LIU Dan,DU Ying-ji,SHI Kai-fang(College of Water Resources and Architectural Engineering,Northwest Agricultural and Forestry University,Yangling 712100,Shaanxi Province,China) |
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| Abstract: | Reactive powder concrete(RPC) is a new type of cement composite material with high mechanical properties,which is designed according to the maximum density theory.Nano-SiO2 is smaller than the diameter of each component in RPC,it not only can fill the tiny gaps physically but also has high pozzolanic activity.The base mix of RPC is selected through orthogonal design of L9(34)by considering the water-cement ratio,silica fume and slag.Then,by adding different contents of nano-SiO2.It is found that the flexura... |
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| Keywords: | reactive powder concrete nano-SiO2 orthogonal design mechanical properties microscopic analysis |
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