ECC全包裹混凝土的抗硫酸盐侵蚀和抗冻性能  

Sulfate Corrosion and Frost Resistances of Concrete Confined with Engineered Cementitious Composites(ECC)

作　　者：康迎杰 郭自利[4] 叶斌斌 潘鹏[4,5] KANG Yingjie;GUO Zili;YE Binbin;PAN Peng(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;MOE Key Laboratory of Civil Engineering Safety and Durability,Tsinghua University,Beijing 100084,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]河北省风工程和风能利用工程技术创新中心,石家庄050043 [3]石家庄铁道大学土木工程学院,石家庄050043 [4]清华大学土木工程系,北京100084 [5]土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《材料导报》2024年第22期164-170,共7页Materials Reports

基　　金：国家重点研发计划(2019YFC1907204)。

摘　　要：工程用水泥基复合材料(ECC)和混凝土组合构件在力学性能上体现出一定的优势,但目前缺乏对此类组合构件耐久性能的定性和定量评价。为研究该类组合构件的抗硫酸盐侵蚀和抗冻性能,采用二次浇筑方式制备出ECC全包裹混凝土组合试件,随后对混凝土、ECC和ECC全包裹混凝土试件进行了硫酸盐干湿循环和冻融循环试验,建立了耐久性损伤模型,并预测了服役寿命。结果表明,从抗压强度、表观状态和质量损失的变化规律来看,ECC全包裹混凝土试件相比普通混凝土试件抗硫酸盐侵蚀和抗冻性能均有显著提升,提升效果随包裹厚度的增大而提高。另外,ECC全包裹混凝土试件在受环境侵蚀后仍能维持良好的表观状态,预测的服役寿命更长,其中尤以在硫酸盐侵蚀环境中表现突出。Engineeredcementitious composites(ECC)-concrete combined components have exhibited specific advantages in terms of mechanical properties.However there currently lacks qualitative and quantitative evaluation of the durability performance of such combined components.In order to study the sulfate corrosion and frost resistance of ECC-concrete combined components,the combined specimens of concrete confined with ECC were prepared through secondary pouring method.The cyclic tests of sulfate drying-wetting alternations and freeze-thaw alternations were carried out on the concrete,the ECC,and the combined specimens.The damage model was established and the service life prediction was performed.Results showed that resistances of the combined specimens to sulfate corrosion and frost were significantly improved compared with the concrete specimen from the perspectives of variations of compressive strength,apparent morphology,and mass loss,and the magnitude of these improvements increased with increasing thickness of ECC.Moreover,the combined specimens maintained apparent status better than the concrete specimen after exposed to environmental erosion,and also had longer predicted service lifetime,especially in the sulfate corrosion environment.

关 键 词：ECC全包裹混凝土 抗硫酸盐侵蚀 抗冻性能 组合试件 

分 类 号：TU528.1[建筑科学—建筑技术科学]