[1]刘桂凤,蒋逸凡,阚德远,等.再生细骨料品质对砂浆力学性能和微观结构的影响[J].常州大学学报(自然科学版),2023,35(06):65-72.[doi:10.3969/j.issn.2095-0411.2023.06.009]
　LIU Guifeng,JIANG Yifan,KAN Deyuan,et al.Effect of the quality of recycled fine aggregate on the mechanical properties and microstructure of mortar[J].Journal of Changzhou University(Natural Science Edition),2023,35(06):65-72.[doi:10.3969/j.issn.2095-0411.2023.06.009]
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再生细骨料品质对砂浆力学性能和微观结构的影响()
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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:
第35卷
期数:
2023年06期
页码:
65-72
栏目:
土木工程：混凝土骨科专题
出版日期:
2023-11-28

文章信息/Info

Title:
Effect of the quality of recycled fine aggregate on the mechanical properties and microstructure of mortar
文章编号:
2095-0411(2023)06-0065-08
作者:
刘桂凤;  蒋逸凡;  阚德远;  陈正发
(常州大学 城市建设学院, 江苏 常州 213164)
Author(s):
LIU Guifeng;  JIANG Yifan;  KAN Deyuan;  CHEN Zhengfa
(School of Urban Construction, Changzhou University, Changzhou 213164, China)
关键词:
再生细骨料;  砂浆;  力学性能;  微观结构;  孔隙结构
Keywords:
recycled fine aggregate;  mortar;  mechanical properties;  microstructure;  pore structure
分类号:
TU 502
DOI:
10.3969/j.issn.2095-0411.2023.06.009
文献标志码:
A
摘要:
研究收集了不同来源的再生细骨料(RFA),并用压碎值和矿物组成来评定再生细骨料的品质。然后,将不同品质的再生细骨料制备成砂浆,对砂浆进行力学性能测试,并通过扫描电镜和核磁共振测试分别观察再生细骨料砂浆内部的微观结构和孔隙结构特征。结果表明,再生细骨料的品质与其压碎值呈负相关,再生细骨料的压碎值有差异的原因是其矿物组成不同,再生细骨料制备的砂浆的力学性能与再生细骨料的品质呈正相关。再生细骨料的品质越好,再生细骨料砂浆的微观缺陷和孔隙数量越少。相比于普通废弃混凝土,废弃的活性粉末混凝土的破碎产物只含再生细骨料且矿物组成更加坚硬,更适合用作天然河砂的替代品。
Abstract:
The use of recycled fine aggregate as an alternative to natural sand will not only help to solve the shortage of river sand resources, but also help to manage construction waste. The properties of mortar prepared from recycled fine aggregate are closely related to the quality of recycled fine aggregate. In this study, recycled fine aggregate from different sources was collected and the quality of recycled fine aggregate was assessed by crushing value and mineral composition. Then, the recycled fine aggregate of different qualities was prepared into mortar, and the mechanical properties of the mortar were tested. Besides, the internal microstructure and pore structure characteristics of the RFA mortar were observed by the scanning electron microscopy and nuclear magnetic resonance test. The results show that the quality of recycled fine aggregate is negatively correlated with its crushing value. The reason for the difference in crushing value of recycled fine aggregate is its different mineral composition. The mechanical properties of mortar prepared from recycled fine aggregate depend on the quality of recycled fine aggregate. The better the quality of recycled fine aggregate, the less the number of micro-defects and pores of recycled fine aggregate mortar. Compared to the ordinary waste concrete, the crushed product of waste reactive powder concrete contains only recycled fine aggregate and has a harder mineral composition, making it more suitable for use as a substitute for natural river sand.

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备注/Memo

备注/Memo:
收稿日期: 2023-05-10。
基金项目: 国家自然科学基金资助项目(51908075)。
作者简介: 刘桂凤(1973—), 女, 山东泰安人, 硕士, 副教授。通信联系人: 陈正发(1971—), E-mail: chenzhengfa@cczu.edu.cn
更新日期/Last Update: 1900-01-01