贻贝粗骨料混凝土的宏微观性能
作者:
作者单位:

浙江大学 建筑工程学院,浙江 杭州 310058

作者简介:

钟 何(1990—),男,安徽凤阳人,浙江大学硕士生. E-mail: 18055997978@163.com

通讯作者:

赵羽习(1973—),女,浙江杭州人,浙江大学教授,博士生导师,博士. E-mail: yxzhao@zju.edu.cn

中图分类号:

TU528.09

基金项目:

浙江省“高层次人才特殊支持计划”科技创新领军人才项目(2021R52035)


Macroscopic and Microscopic Properties of Mussel Coarse Aggregate Concrete
Author:
Affiliation:

College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

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    摘要:

    为了提高贝壳废弃物的消纳量,实现资源循环利用,以贻贝粗骨料替代天然粗骨料,制备了贻贝粗骨料取代率为15%、30%、45%、60%、100%的贻贝粗骨料混凝土,并研究了其宏微观性能.结果表明:贻贝粗骨料中具有较高含量的无机钙,但作为天然粗骨料的替代材料,由于吸水率为2.4%、表观密度为2 402 kg/m3、压碎指标为68.2%,均超出规范要求,贻贝粗骨料物理性能弱于天然粗骨料;随着贻贝粗骨料取代率的提高,贻贝粗骨料混凝土的力学性能降低;贻贝粗骨料与砂浆界面过渡区的缺陷区域是混凝土性能劣化的主要原因;配合比设计得出,当贻贝粗骨料取代率为30%时,可以制备强度等级为C30的贻贝粗骨料混凝土.

    Abstract:

    In order to increase the consumption of shellfish waste and realize the recycling of resources, the mussel coarse aggregate was used to replace the natural coarse aggregate. The mussel coarse aggregate concrete with the substitution rate of 15%, 30%, 45%, 60% and 100% was prepared, and its macro and micro properties were studied. The results show that the mussel coarse aggregate has a high content of inorganic calcium, but as a substitute for natural coarse aggregate, the physical properties of mussel coarse aggregate are weaker than that of natural coarse aggregate because the water absorption is 2.4%, the apparent density is 2 402 kg/m3, and the crushing index is 68.2%, which exceeds the requirements of the specification.With the increase of the replacement rate of mussel coarse aggregate, the mechanical properties of mussel coarse aggregate concrete decrease. The main reason for the deterioration of concrete performance is the defect area in the interface transition zone between mussel coarse aggregate and mortar. The mix design shows that when the replacement rate of mussel coarse aggregate is 30%, the mussel coarse aggregate concrete with C30 strength can be prepared.

    表 1 贻贝粗骨料混凝土配合比Table 1 Mix proportions of mussel coarse aggregate concrete
    表 2 贻贝粗骨料混凝土的其他力学性能Table 2 Other mechanical properties of mussel coarse aggregate concrete
    图1 显微硬度测试压痕点阵示意图Fig.1 Schematic diagram of indentation dot matrix for microhardness test
    图2 贻贝壳微观结构Fig.2 Microstructure of mussel shell
    图3 贻贝壳EDS分析Fig.3 EDS analysis of mussel shell
    图4 贻贝粗骨料混凝土立方体抗压强度Fig.4 Cube compressive strength of mussel coarse aggregate concrete
    图5 MU-30组在显微硬度仪中的界面形貌Fig.5 Interface morphology of MU-30 group in microhardness tester
    图6 贻贝粗骨料混凝土界面长度与骨料取代率、28 d立方体抗压强度的关系Fig.6 Relationship between interface length and mussel coarse aggregate substitution rate, 28 d cube compressive strength
    图7 XCT断层扫描下MU-30组28 d贻贝粗骨料混凝土劈裂受拉裂缝的发展情况Fig.7 Development of splitting tensile cracks in 28 d mussel coarse aggregate concrete of MU-30 group under XCT scanning
    图8 MU-30组显微硬度测试结果Fig.8 Microhardness test results of MU-30 group
    图9 贻贝粗骨料混凝土界面过渡区显微硬度Fig.9 Microhardness of mussel coarse aggregate concrete interface transition zone
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钟何,赵羽习,孟涛.贻贝粗骨料混凝土的宏微观性能[J].建筑材料学报,2022,25(11):1160-1167

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  • 收稿日期:2022-04-27
  • 最后修改日期:2022-07-21
  • 在线发布日期: 2022-11-30
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