化学侵蚀后砂浆力学特性的劣化及其细观结构损伤定量化方法*

doi:10.11901/1005.3093.2015.12.921

材料研究学报

2015, Vol. 29

Issue (12): 921-930 DOI: 10.11901/1005.3093.2015.12.921

本期目录 | 过刊浏览

化学侵蚀后砂浆力学特性的劣化及其细观结构损伤定量化方法*

韩铁林^1,²(

),师俊平²,陈蕴生^1,²,党硕^1,²,苏鹏^1,²

1. 西安理工大学岩土工程研究所西安 710048
2. 西安理工大学土木建筑工程学院西安 710048

Salt Solution Attack Induced Mechanical Property Degradation and Quantitative Analysis Method for Evolution of Meso-structure Damages of Mortar

Tielin HAN^1,^2,^**(

),Junping SHI²,Yunsheng CHEN^1,²,Shuo DANG^1,²,Peng SU^1,²

1. Institute of Rock and Soil Mechanics, Xi'an University of Technology, Xi'an 710048, China
2. School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China

引用本文:

韩铁林,师俊平,陈蕴生,党硕,苏鹏. 化学侵蚀后砂浆力学特性的劣化及其细观结构损伤定量化方法*[J]. 材料研究学报, 2015, 29(12): 921-930.
Tielin HAN, Junping SHI, Yunsheng CHEN, Shuo DANG, Peng SU. Salt Solution Attack Induced Mechanical Property Degradation and Quantitative Analysis Method for Evolution of Meso-structure Damages of Mortar[J]. Chinese Journal of Materials Research, 2015, 29(12): 921-930.

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摘要:

研究了在不同水化学环境下砂浆试样力学特性劣化及其微细观结构损伤的演化, 并探讨其力学特性劣化的细观机制。结果表明, 化学腐蚀后试样峰值前的塑性变形有所增大。溶液对试样的化学腐蚀作用越强其塑性变形越大, 并具有明显的时间阶段性。腐蚀后试样塑性变形的变化, 间接地反映了化学溶液对砂浆试样的腐蚀程度。提出无损量测方法计算不同腐蚀时间段内砂浆试样的孔隙率, 并基于其孔隙率的变化建立了新的损伤变量。研究发现, 砂浆试样的化学损伤程度与其物理力学参数之间的一致性比较明显。这说明, 用基于化学腐蚀产生的次生孔隙率建立的损伤变量定量描述试样微细观结构的化学损伤程度及其物理力学特性随化学损伤的演化过程, 是合理的。

关键词 ：无机非金属材料, 砂浆, 化学腐蚀, 细观化学损伤变量, 塑性变形

Abstract：

The meso-structure evolution of mortar may certainly induce a significant effect on its macroscopic mechanical properties. Herewith, the mechanism concerning the mechanical property degradation and the evolution of corrosion induced meso-structure damages of mortar were studied after immersion in different salt solutions. The experimental results show that after corrosion in salt solutions, the plastic deformation of mortar increased; and the stronger is the corrosion attack, the larger is the plastic deformation of the mortar; however which is an obvious time dependent process. Thus the degree of plastic deformation may be a reflection of the corrosion degree of mortar. A method based on nondestructive inspection was proposed to predict the variation of mortar porosity versus corrosion time, and then a new parameter for describing the damages was proposed . The present study revealed that after immersion in salt solutions the corrosion attack induced damage degree of mortar is closely related to its physical and mechanical parameters, which proves that the proposed method for quantitative analysis of the evolution of meso-structure damages is reasonable.

Key words： inorganic non-metallic materials mortar specimen chemical erosion meso-chemical damage variable plastic deformation

收稿日期: 2015-03-23

基金资助:* 国家自然科学基金51269024和11302167资助项目

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图1 不同化学溶液pH值变化的柱状图

图2 浸泡240 d后0.01 mol/L Na2SO4 pH=1, 3, 7, 9溶液物理参数柱状图

图3 浸泡240 d后0.01, 0.1, 0.5 mol/L Na2SO4溶液物理参数柱状图

图4 浸泡240 d后0.01 mol/L Na2SO4和NaHCO3溶液物理参数的柱状图

图5 浸泡240 d后0.01 mol/L pH=7.0的Na2SO4和蒸馏水溶液物理参数的柱状图

表1 砂浆试样的单轴压缩实验结果

图6 砂浆试样Up与ε1的关系曲线

图7 砂浆试样Up与σ、E的关系曲线

表2 砂浆试样孔隙率及其纵波波速

图8 腐蚀后砂浆试样的Vp(t)与n(t)关系曲线

图9 砂浆试样b与a关系曲线

图10 Up与孔隙率变化率a、纵波波速变化率b的关系曲线

图11 D与塑性变形Up、ε1的关系曲线

图12 D与峰值强度σ、E的关系曲线

图13 D与纵波波速变化率b的关系曲线

图14 D与溶出的Ca2+、Mg2+离子浓度的关系曲线

图15 溶出Fe(Fe3+、Fe2+)离子浓度与D的关系曲线

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