超高韧性水泥基复合材料抗冻耐久性能试验研究  

Experimental study of the durability properties of ultra-high toughness cementitious composites under freezing and thawing cycles

作　　者：徐世烺[1] 蔡新华[1] 李贺东[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《土木工程学报》2009年第9期42-46,共5页China Civil Engineering Journal

基　　金：国家自然科学基金重点项目(50438010);南水北调工程建设重大关键技术研究及应用(JGZXJJ2006-13)

摘　　要：超高韧性水泥基复合材料(UHTCC)具有拉伸应变硬化特性,并伴随多条细密裂缝特征,具有良好的裂缝控制功效,但作为一种新型建筑材料,其在冻融循环条件下的性能是否发生显著改变也是我们关心的一个问题。通过对比试验系统地研究UHTCC与同强度等级的普通混凝土、引气混凝土和钢纤维混凝土在相同冻融循环条件下的性能变化,包括动弹性模量损失、质量损失、弯曲抗拉强度、弯曲韧性、裂缝状态以及UHTCC薄板冻融后的弯曲抗拉强度。结果表明,经过300次冻融循环,UHTCC仍然能较好的保持其原有的应变硬化特征以及拉应力状态下的多条细密裂缝特征,能够完全满足寒冷地区工程的需要。Due to its strain-hardening and tight crack width characteristics under tensile conditions, ultra-high toughness cementitious composite （UHTCC） has been increasingly developed in recent years. Its properties of resisting freezing and thawing cycles are also of concern, and the dynamic elastic modulus loss, mass loss, flexural strength, flexural toughness, crack pattern and bending property of thin UHTCC slabs under freezing-thawing cycles are investigated and compared with those of ordinary concrete, air-entrained concrete and fiber reinforced concrete with comparable ompressive strength levels. The results show that UHTCC could retain its strain-hardening and tight crack width characteristics under tensile conditions after 300 freezing and thawing cycles, satisfying the requirements for applications in cold regions.

关 键 词：超高韧性水泥基复合材料 冻融循环 应变硬化 弯曲抗拉强度 

分 类 号：TU502.6[建筑科学—建筑技术科学] TU528.58