Micro-mechanical properties of alkali-activated fly ash evaluated by nanoindentation
Micro-mechanical properties of alkali-activated fly ash evaluated by nanoindentation
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纳米压痕评价碱活化粉煤灰的微观力学性能
DOI：
10.1016/j.conbuildmat.2017.04.176
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发表时间：
2017-08-30
影响因子：
7.4
通讯作者：
Hu, J.
中科院分区：
文献类型：
--
作者：
Ma, Y.;Ye, G.;Hu, J.
采用纳米压痕技术研究了碱激发粉煤灰（AAFA）浆体中不同相的微观力学性能。然后将AAFA中凝胶相的力学信息分别与SEM-EDX、ATR-FTIR和N-2吸附提供的化学和微观结构信息联系起来。三个阶段，即铝硅酸盐凝胶，残余粉煤灰颗粒和孔隙，被确定从微观结构分析AAFA，对应于三个不同的峰值在压痕模量频率图。对应于凝胶相的峰随养护龄期和活化剂含量而变化。纳米压痕法测量硅铝凝胶的弹性模量受纳米尺度和微米尺度之间的孔隙的影响。然而，AAFA的化学键的结果，不能很好地对应于微观力学的结果。(C)2017爱思唯尔有限公司版权所有
In this study, the micro-mechanical property of different phases in alkali-activated fly ash (AAFA) pastes was investigated by nanoindentation. The mechanical information of the gel phase in AAFA was then linked to the chemical and microstructural information provided by SEM-EDX, ATR-FTIR and N-2 adsorption, respectively. Three phases, i.e. aluminosilicate gel, residual fly ash particles and pores, were identified from the microstructural analysis of AAFA, corresponding to three distinct peaks in the indentation modulus frequency plots. The peak corresponding to the gel phase varied with curing age and activator content. The elastic modulus of aluminosilicate gel measured by nanoindentation was affected by the pores between nano to micro scale. The results of the chemical bonds of AAFA, however, cannot correspond well with the micromechanical results. (C) 2017 Elsevier Ltd. All rights reserved.