某工程混凝土构件点状爆裂质量问题原因分析及处理  

Analysis and Treatment of Quality Problems Caused by Point-like Cracking of Concrete Components

作　　者：曹云玉 董彦圣 徐飘霞 徐国孝 CAO Yunyu;DONG Yansheng;XU Piaoxia;XU Guoxiao(Zhejiang Jianke New Material Development Co.,Ltd.,Hangzhou Zhejiang 310012,China;Zhejiang Jianke Architectural Design Institute Co.,Ltd.,Hangzhou Zhejiang 310012,China;Zhejiang Academy of Building Research and Design Co.,Ltd.,Hangzhou Zhejiang 310012,China)

机构地区：[1]浙江建科新材料开发有限公司,浙江杭州310012 [2]浙江省建科建筑设计院有限公司,浙江杭州310012 [3]浙江省建筑科学设计研究院有限公司,浙江杭州310012

出　　处：《工程质量》2023年第11期21-24,共4页Construction Quality

摘　　要：通过对某工程混凝土点状爆裂处粉末XRD图谱分析和化学成分分析,检测出该粉末含有硅酸三钙Ca_(3)(SiO_(4))O和铁铝酸二钙Ca_(2)(FeAl)O_(5)。经过调查,得出混凝土点状爆裂原因是混凝土细骨料中混入了少量水泥熟料颗粒,与水泥熟料中包裹着的游离氧化钙CaO的电厂炉渣Fe_(2)O_(3)、Ca(OH)_(2),在混凝土浇捣过程中和后期遇水或空气中的水分一起水化反应,从而引起混凝土体积膨胀,出现点状爆裂。Through XRD and chemical composition analysis,it was detected that the powder from the pointlike cracking of the concrete contained tricalcium silicate Ca_(3)(SiO_(4))O and dicalcium iron aluminate Ca_(2)(FeAl)O_(5).Upon analysis,it was found that a small amount of cement clinker particles had mixed into the concrete aggregate,which encapsulated power plant slag Fe_(2)O_(3),Ca(OH)_(2) containing free calcium oxide CaO.These particles reacted chemically with water,causing volu me expa nsion a nd point-like cracking in the concrete.

关 键 词：混凝土 点状爆裂 水泥熟料 电厂炉渣 游离氧化钙 

分 类 号：TU528[建筑科学—建筑技术科学]