混合砂混凝土加速盐侵蚀作用的孔隙结构分析  

Study on pore structure of mixed sand concrete to accelerate salt erosion

作　　者：高猛 姚占全[1] 王海龙[1] GAO Meng;YAO Zhanquan;WANG Hailong(College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot,Inner Mongolia 010018,China)

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,内蒙古呼和浩特010018

出　　处：《排灌机械工程学报》2025年第1期53-59,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(52069024)。

摘　　要：为探究不同环境工况条件下加速硫酸盐侵蚀混合砂混凝土内部孔隙结构的变化规律,通过初始损伤、复合盐、冻融循环、干湿循环、多倍浓度和高温环境工况条件下硫酸盐侵蚀混合砂混凝土试验,结果表明:不同环境工况下硫酸盐侵蚀作用对混合砂混凝土内部的孔隙结构变化规律影响不同,随着侵蚀周期的增加,除多倍浓度与复合盐工况下无害孔呈现略有增加外,其余工况下无害孔和少害孔占比总体均呈现降低趋势;与对照组相比,多倍浓度、初始损伤和冻融循环工况下无害孔占比减少,而复合盐、高温和干湿循环工况下无害孔占比相对增多,初始损伤和高温工况下多害孔占比大幅增多而其余工况多害孔占比均减少;与对照组相比,干湿循环工况条件下孔隙度最大提升32%,多倍浓度工况条件下平均孔径最大提升3255.4%,初始损伤工况条件下,束缚流体饱和度损伤量和自由流体饱和度的增大量最大.In order to explore the change law of internal pore structure of mixed sand concrete under accelerated sulfate attack under different environmental conditions,the experimental study on sulfate attack mixed sand concrete under initial injury,mix salt,freeze-thaw cycle,dry-wet cycle,multiple concentrations and high temperature environmental conditions shows that the effect of sulfate attack on the change law of internal pore structure of mixed sand concrete under different environmental conditions is different.With the increase of erosion period,the proportion of harmless pores and less harmful pores under other conditions shows a decreasing trend except that the harmless pores under multiple concentration and composite salt conditions show a slight increase.Compared with the control group,the proportion of harmless holes decreases under the conditions of multiple concentration,initial damage and freeze-thaw cycle,while the proportion of harmless holes increases under the conditions of compound salt,high temperature and dry-wet cycle.The proportion of harmful holes increases significantly under the conditions of initial damage and high temperature,while the proportion of harmful holes decreases under the other conditions.Compared with the control group,the porosity increases by 32%under the condition of dry-wet cycle,the average pore diameter increases by 3255.4%under the condition of multiple concentration,and the increase of bound fluid saturation damage and free fluid saturation under the condition of initial damage was the largest.

关 键 词：硫酸盐侵蚀 多工况 孔径分布 孔隙度 平均孔径 

分 类 号：S277.9[农业科学—农业水土工程]