盐冻作用下再生砖粉ECC力学性能及寿命预测  

Mechanical properties and life prediction of recycled brick powder ECC under salt freezing

作　　者：楚留声[1] 赵静静 赫约西 元成方[1] 程站起[1] CHU Liusheng;ZHAO Jingjing;HE Yuexi;YUAN Chengfang;CHENG Zhanqi(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]北京工业大学建筑工程学院,北京100124

出　　处：《建筑科学与工程学报》2025年第2期131-141,共11页Journal of Architecture and Civil Engineering

基　　金：黄河实验室(郑州大学)一流课题专项基金资助项目(YRL22IR09)。

摘　　要：利用再生砖粉取代石英砂制备工程用水泥基复合材料(ECC),研究了不同砖粉取代率对ECC力学性能的影响;根据力学性能试验结果选取再生砖粉100%取代石英砂制备再生砖粉ECC,对比其与基准配合比ECC、同强度等级混凝土在不同介质(清水、NaCl溶液、Na_(2)SO_(4)溶液以及NaCl与Na_(2)SO_(4)混合溶液)侵蚀下的抗冻耐久性,对不同侵蚀介质下基准配合比ECC和再生砖粉ECC的抗冻耐久性寿命进行预测。结果表明:随再生砖粉取代率的增大,ECC的抗折与抗压强度逐渐减小,100%取代率下基体抗折强度为16.5 MPa,抗压强度为33.7 MPa;不同砖粉取代率下基体拉应变均可达2.5%以上,且弯曲韧性良好;300次冻融循环后,C30混凝土质量损失率、相对动弹性模量变化率及抗压强度损失率均最大,再生砖粉ECC次之,基准配合比ECC最小;基准配合比ECC和再生砖粉ECC均具有良好的抗盐冻能力;再生砖粉ECC在“三北”地区的抗冻耐久性良好,单一冻融环境下抗冻耐久性寿命均在90年以上,单一盐冻环境下均在65年以上。Using recycled brick powder instead of quartz sand to prepare engineering cementitious composites(ECC),the influence of different brick powder substitution rates on the mechanical properties of ECC was studied.Based on the results of mechanical performance tests,recycled brick powder was selected to replace quartz sand 100%to prepare recycled brick powder ECC.The frost-resistance durability of ECC with reference mix ratio and concrete of the same strength grade were compared under different media(water,NaCl solution,Na_(2)SO_(4)solution,and NaCl Na_(2)SO_(4) mixed solution)erosion.The frost-resistance durability life of benchmark mix ECC and recycled brick powder ECC under different erosion medium were predicted.The result show that as the substitution rate of recycled brick powder increases,the flexural and compressive strength of ECC gradually decreases.At 100%substitution rate,the flexural strength of matrix is 16.5 MPa and the compressive strength is 33.7 MPa.Under different substitution rates of brick powder,the tensile strain of matrix can reach over 2.5%,and the bending toughness is good.After 300 freeze-thaw cycles,the mass loss rate,change rate of relative dynamic modulus of elasticity,and compressive strength loss rate of C30 concrete are the highest,followed by recycled brick powder ECC,and the benchmark mix ratio ECC is the lowest.The benchmark mix ratio ECC and recycled brick powder ECC both have good salt freezing resistance.Recycled brick powder ECC has a good frost resistance in the“Three North”and the frost-resistance durability life is area,up to more than 90 years in a single freeze-thaw environment and more than 65 years in a single salt freezing environment.

关 键 词：工程用水泥基复合材料 再生砖粉 盐冻 质量损失率 相对动弹性模量 寿命预测 

分 类 号：TU528[建筑科学—建筑技术科学]