钢渣砂砂浆(SSM)膨胀破坏的力学行为  

Mechanical Behavior of Expansion of Steel Slag Sand Mortar(SSM)

作　　者：伦云霞[1] 周明凯[1] 蔡肖[1] 陈美祝[1] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,武汉430070

出　　处：《武汉理工大学学报》2008年第11期62-64,86,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50678139)

摘　　要：通过力学性能和80℃水热加速养护条件下砂浆棒自由线性膨胀率实验,结合SEM等微观测试技术,分析探讨了不同基体强度对钢渣砂砂浆(SSM,下同)膨胀行为的影响及水热养护不同龄期的力学性能与自由线性膨胀率的关系,从力学角度阐述了SSM膨胀破坏的机理。结果表明:基体强度的提高能有效减小SSM的膨胀率,推迟断裂龄期,降低最终开裂破坏程度,但不能最终抑制钢渣砂砂浆的开裂。80℃水热加速养护条件下,SSM强度的发展趋势与砂浆棒自由线性膨胀率有较好的相关性。当某点水泥石的拉伸应变达到极限时,裂缝以钢渣砂膨胀粒子为中心向四周呈放射状扩散,最终导致SSM强度降低和宏观开裂。This research deals with the mechanical mechanism of expansion of steel slag sand mortar through the measurement of strength and expansion rate. The results indicate that the improvement of matrix strength could lower the expansion rate of steel slag sand mortar, extend the cracking age, reduce the degree of cracking but couldn＇t prevent the specimens made with stcel slag from crack. Under accelerated curing regime of hot water at 80 ℃, the developmental trend of strength and expansion rate present favorable correlation and the sharp increase of expansion rate is accompanied with the decrease of strength. The bonding strength from the hydration of cement could restrain expansion of steel slag at early age. But, cracks centered on the expansionary steel slag and diffused radioactively, when the tensile strain exceeded the critical value of hardened cement.

关 键 词：钢渣砂砂浆 基体强度 膨胀率 应力匹配 

分 类 号：TU528.2[建筑科学—建筑技术科学]