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硫酸钠溶液pH值对硅酸盐水泥砂浆析钙及侵蚀产物的影响
Effects of pH Value of Sulfate Solution on Calcium Leaching and Products of Cement Mortars
投稿时间:2018-05-29  修订日期:2018-09-03
DOI:103969/j.issn.1007 9629201902003
中文关键词:  硅酸盐水泥  硫酸盐侵蚀  pH值  石膏  析钙
英文关键词:Portland cement  sulfate attack  pH value  gypsum  calcium leaching
基金项目:国家重点研发计划“重点基础材料技术提升与产业化”专项课题(2017YFB0310001);国家自然科学基金资助项目(51578004,51608004,51778003);安徽省自然科学基金资助项目(1708085QE102);安徽高校优秀青年骨干人才国内外访学研修项目(gxgwfx2018048);高性能土木工程材料国家重点实验室开放基金(2018CEM002)
              
作者单位
刘开伟
LIU Kaiwei
安徽建筑大学安徽省先进建筑材料重点实验室,安徽合肥230022
Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China
程星星
CHENG Xingxing
安徽建筑大学安徽省先进建筑材料重点实验室,安徽合肥230022
Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China
孙道胜
SUN Daosheng
安徽建筑大学安徽省先进建筑材料重点实验室,安徽合肥230022
Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China
王爱国
WANG Aiguo
安徽建筑大学安徽省先进建筑材料重点实验室,安徽合肥230022
Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China
张高展
ZHANG Gaozhan
安徽建筑大学安徽省先进建筑材料重点实验室,安徽合肥230022
Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China
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中文摘要:
      将水泥砂浆浸泡在pH值为5,9,13的Na2SO4溶液中至330d,采用化学滴定法测定砂浆中Ca2+,OH-的析出量,采用X射线衍射(XRD)仪和差示扫描量热法(DSC)对不同侵蚀龄期下侵蚀产物进行半定量分析,并通过扫描电子显微镜(SEM)对钙硅比和微结构进行了分析.结果表明:溶液pH值越低,Ca2+析出速率越快、析出量越大,且低pH值条件下Ca2+的大量析出有助于其与侵入的SO2-4结合,形成更多低溶解度的CaSO4·2H2O,从而加速Ca2+析出和SO2-4扩散渗入;低pH值环境下大量石膏的形成伴随着Ca(OH)2的大量消耗,且会引起CSH凝胶的脱钙,导致水泥砂浆的胶凝性降低,引起试件的软化和剥落.
英文摘要:
      Cement mortars were prepared and immersed in Na2SO4solution with different pH values, i.e. 5, 9, and 13, up to 330days. The contents of leached Ca2+ and OH- in solution were analyzed through chemical titration, and products of cement mortars during attack were analyzed by X ray diffraction and differential scanning calorimetry. In addition, scanning electron microscope was further applied to investigate nCa/nSi and microstructures. The results show that the content and rate of calcium leaching in high pH environment are larger than that in the lower pH solution. The leached Ca2+ will continue to react with the diffused SO2-4 to form more CaSO4·2H2O at the lower pH environment. The formation of gypsum in low pH value is accompanied with the consumption of calcium hydroxide, which can cause the decalcification of C S H gel and decrease the gelling property of cement mortar, and result in softening and spalling of the specimens.
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