Effects of nano-SiO2 particles on the mechanical and microstructural properties of ultra-high performance cementitious composites
Effects of nano-SiO2 particles on the mechanical and microstructural properties of ultra-high performance cementitious composites
复制标题
纳米SiO2颗粒对超高性能水泥基复合材料力学和微观结构性能的影响
DOI：
10.1016/j.cemconcomp.2014.11.001
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发表时间：
2015-02-01
影响因子：
10.5
通讯作者：
Jiang, Guang
中科院分区：
文献类型：
--
作者：
Rong, Zhidan;Sun, Wei;Jiang, Guang
本文采用不同的方法研究了纳米SiO2颗粒对超高性能水泥基复合材料的力学性能、水化过程和微观结构演变的影响。结果表明：当纳米SiO2含量达到3%时，复合材料的抗压强度和抗折强度随着纳米SiO2含量的增加而增加;当纳米SiO2含量超过3%时，由于纳米SiO2颗粒的团聚，复合材料的力学性能略有下降。纳米SiO2的加入加速了水化过程。孔隙率和平均孔径随纳米SiO2含量的增加和老化而减小。与对照试样相比，纳米SiO2试样的微观结构更加均匀和致密。所有这些改善主要归因于纳米SiO2的火山灰效应和填料效应。(C)2014爱思唯尔有限公司版权所有。
In this research the effects of nano-SiO2 particles on the mechanical performance, hydration process and microstructure evolution of ultra-high performance cementitious composites were investigated by different methods. The results showed that the compressive and flexural strength increased with the increase of the nano-SiO2 content up to 3% and due to agglomeration of nano-SiO2 particles, the mechanical properties decreased slightly when the nano-SiO2 content was more than 3%. The hydration process was accelerated by the addition of nano-SiO2. The porosity and the average pore diameter decreased with the increase of the nano-SiO2 content and aging. The microstructure was more homogenous and dense for nano-SiO2 specimens as compared to the control specimen. All of these improvements could be mainly attributed to the pozzolanic and filler effects of nano-SiO2. (C) 2014 Elsevier Ltd. All rights reserved.