水灰比对热环境中混凝土早期水化物相组成与强度发展的影响  

Effects of Water to Cement Ratio on Early Age Hydration Phases Composition and Strength Development of Concrete in Thermal Environment

作　　者：张风臣[1] 艾玲玲[2] 沈德建[2] 

机构地区：[1]河海大学力学与材料学院 [2]河海大学土木与交通学院,南京210098

出　　处：《混凝土与水泥制品》2010年第5期7-10,共4页China Concrete and Cement Products

基　　金：江苏省自然科学基金(BK2009754);中国博士后科学基金(20100471376)

摘　　要：大体积混凝土内部水化热以及制品的外部热源养护使得胶凝材料早期水化反应处在一定的温度场中,其物相组成与强度发展不同于常温养护。通过试验研究不同水灰比混凝土在不同环境温度下的早期水化物相组成和强度发展历程,采用劈裂抗拉强度与抗压强度的比值评价其脆性。试验结果表明,随着环境温度的提高,不同水灰比混凝土抗压强度呈现增长趋势。不同水灰比混凝土的劈裂抗拉强度在50℃环境温度下最高,温度继续升高,劈裂抗拉强度呈现降低趋势,且低水灰比混凝土劈裂抗拉强度降低明显。在较低温环境下,水灰比对水泥石物相组成几乎没有影响;而在较高温环境中,水灰比不同,水泥石物相组成也不相同。Cement hydration at early age is in a certain temperature field because of hydration heat of mass concrete as well as ce-ment productions curing with high temperature.Therefore phases composition and strength development in thermal environment are com-monly different from those in normal curing conditions.Phases composition and strength development at early age of concrete with differ-ent water to cement ratio（w/c） cured in different thermal environment are studied,and the brittleness is evaluated by means of tensile-splitting strength to compressive strength ratio.Experimental results show that compressive strength of concrete with different w/c are im-proved with the increase of curing temperature.Tensile-splitting strength increases most at 50℃ and decreases when the curing tempera-ture continued to increase.Moreover,tensile-splitting strength of concrete with lower w/c decreases obviously.In lower temperature envi-ronment,the w/c has little effects on phases composition,while in higher temperature environment,phases composition varies with the w/ c.

关 键 词：热环境 水灰比 早期 强度发展 水化物相组成 

分 类 号：TU528[建筑科学—建筑技术科学]