双掺矿物添加剂对水泥基材料自修复性能的影响  

Effect of Double Mineral Additives on Self-healing Performance of Cement Based Materials

作　　者：王凯 陈繁育 常洪雷 左志武 刘健 WANG Kai;CHEN Fanyu;CHANG Honglei;ZUO Zhiwu;LIU Jian(Shandong Expressway Group Co.,Ltd,Jinan 250002,China;School of Civil Engineering,Shandong University,Jinan 250061,China;School of Qilu Transportation,Shandong University,Jinan 250002,China)

机构地区：[1]山东高速集团有限公司,济南250002 [2]山东大学土建与水利学院,济南250061 [3]山东大学齐鲁交通学院,济南250002

出　　处：《材料导报》2022年第5期55-61,共7页Materials Reports

基　　金：山东省自然科学基金青年基金(ZR2019QEE017);国家自然科学基金青年基金(51908327);山东大学基本科研业务费专项资金(31560078614117)。

摘　　要：为研究双掺矿物添加剂对水泥基材料早期自修复性能的影响,利用硅灰、偏高岭土、生石灰、膨胀剂及Na_(2)CO_(3)通过两两复掺的形式对10%(质量分数)的水泥进行置换,通过裂缝观测和透水试验评定了九种双掺配比的试件分别在浸水养护和标准养护环境下的修复规律,并测定了浸水养护前后的抗压强度。结果表明,随着修复时间的延长,双掺试件的裂缝宽度及透水系数均逐渐减小,且在浸水环境下的修复效果优于标准养护环境下的修复效果;生石灰分别与硅灰、偏高岭土复掺的试件的裂缝修复效果较好,效果最好的是生石灰与偏高岭土复掺的试件,其在浸水环境下的28 d裂缝修复率可达100%,透水性恢复率可达80%;浸水修复28 d后试件的抗压强度可提升10%~30%,达到无损伤试件强度的60%~80%,且强度提升效果与裂缝宽度及透水系数的修复程度相关性较高;含生石灰的双掺试件的主要修复产物为碳酸钙、氢氧化钙和含Mg化合物,其与硅灰、偏高岭土复掺后的修复产物还有水化硅酸钙、水化硅铝酸钙和一些铝相化合物。In order to study the effect of double mineral additives on the early self-healing performance of cement-based materials,silica fume,meta-kaolin,quicklime,expansive agent and Na_(2)CO_(3) were used to replace 10%(mass percent)cement by double mixing.The repair laws of nine kinds of specimens with double mixing ratio under immersion curing and standard curing environment were evaluated by crack observation and water permeability test,and the compressive strength test was conducted before and after water curing.The results show that with the extension of the repair time,the crack width and water permeability coefficient of the double-mixed specimens gradually decrease,and the repair effect under the water immersion environment is better than that under the standard curing environment;the crack repair rate of the specimens mixed with quicklime and silica fume or metakaolin respectively is better.The best effect is the specimens mixed with quicklime and metakaolin,and its 28 d crack repair rate can reach 100%and the water permeability recovery rate can reach 80%under water immersion environment in 28 d.The compressive strength of the specimens can be increased by 10%—30%,reaching 60%—80%of the strength of the undamaged specimens,and the strength improvement effect has a high correlation with the repair degree of crack width and permeability coefficient.The main repair products of the double-mixed specimens containing quicklime are calcium carbonate,calcium hydroxide and magnesium compounds.The repair products mixed with silica fume and metakaolin include calcium silicate hydrate,calcium aluminosilicate hydrate and some aluminum phase compounds.

关 键 词：自修复 矿物掺合料 水泥基材料 双掺 

分 类 号：TU52[建筑科学—建筑技术科学]