Investigation for Reaction Mechanism of Nano-Silica-Modified Cement-Based Composite Materials

Investigation for Reaction Mechanism of Nano-Silica-Modified Cement-Based Composite Materials
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纳米二氧化硅改性水泥基复合材料反应机理研究

DOI:
10.1080/10584587.2011.576943
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发表时间:
2011-01
影响因子:
0.7
通讯作者:
Zifang Xu,Mingxu Zhang,Fanfie Min
Zifang Xu,Mingxu Zhang,Fanfie Min
中科院分区:
工程技术4区
文献类型:
--
作者:
Zifang Xu,Mingxu Zhang,Fanfie Min

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采用XRD和TGA-DTA分析了纳米SiO2改性水泥基复合材料性能的变化。分析表明,改性后Ca(OH)2结晶减少,晶粒细化,形状不规则。此外,产生的水合物增加,因此强度增加。除微观力学性能测试外,还对改性水泥砂浆的微观形貌进行了SEM测试,结果表明,改性水泥砂浆的水化速率加快,水化产物增多,结构随时间的推移更加致密,从而提高了强度和耐久性。纳米SiO2对水泥砂浆的凝结时间、水泥净浆的流动度等基本性能有明显的改善作用。
Analysis is conducted by using XRD and TGA-DTA of the changed properties of cement-based composite materials modified by nano-silica. As show by the analysis, after the modification, Ca(OH)2 crystallization decreases, with grains finer and of no regular shape. Moreover, there is an increase in hydrates produced and hence increased strength. In addition to micro mechanic tests, SEM tests are done of the micro morphology of the modified cement motar and such findings are obtained as increased rate of hydration, increased production of hydrates, more compacted structure with time and hence increased strength and durability. Furthermore, Nano-silica proves to be effective in modifying basic properties of setting-time of cement motar and the different fluidity of cement paste.
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