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硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (8): 2680-2686.

• 资源综合利用 • 上一篇    下一篇

利用砖混建筑废弃物制备再生混凝土的性能研究

张献蒙1, 刘旭2, 柏彬1, 彭千1, 冀韦伊2   

  1. 1.国网江苏省电力工程咨询有限公司,南京 210008;
    2.南京航空航天大学民航学院,南京 210016
  • 收稿日期:2021-03-11 修回日期:2021-03-18 出版日期:2021-08-15 发布日期:2021-09-02
  • 通讯作者: 刘 旭,博士研究生。E-mail:846092100@qq.com
  • 作者简介:张献蒙(1990—),男,工程师。主要从事输变电工程新技术应用和研究。E-mail:15298379985@163.com
  • 基金资助:
    国网江苏省电力工程咨询有限公司2020年自主科技项目(J202008)

Research on Properties of Recycled Concrete Prepared with Brick and Concrete Construction Waste

ZHANG Xianmeng1, LIU Xu2, BAI Bin1, PENG Qian1, JI Weiyi2   

  1. 1. State Grid Jiangsu Electric Power Engineering Consulting Co., Ltd., Nanjing 210008, China;
    2. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2021-03-11 Revised:2021-03-18 Online:2021-08-15 Published:2021-09-02

摘要: 由砖混建筑废弃物制备的再生粗骨料通常含有部分碎砖粗骨料。为研究碎砖含量对混凝土性能的影响,将再生混凝土粗骨料和碎砖粗骨料按不同比例(体积分数)混合制备混合型再生粗骨料,并以30%的取代率取代天然骨料浇筑混凝土试块进行试验研究。研究结果表明:混凝土破坏时,天然粗骨料沿粗骨料与砂浆之间的界面过渡区断裂失效,而碎砖粗骨料则是贯穿粗骨料内部断裂失效;当碎砖含量不超过18%时,对混凝土抗压强度和抗氯离子渗透性能没有明显影响,碎砖含量超过18%时,抗压强度和抗氯离子渗透性明显下降;碎砖含量越大,混凝土抗盐冻能力越差;当砖含量不变时,水灰比越高,再生碎砖粗骨料对混凝土抗压强度的不利影响越小。

关键词: 混合型再生粗骨料, 混凝土, 抗氯离子渗透, 立方体抗压强度, 抗盐冻性能

Abstract: Recycled coarse aggregate prepared from brick and concrete construction waste usually contains part of the brick aggregate. In order to study the failure mode and the influence of brick content on the properties of mixed recycled coarse aggregate concrete, the recycled concrete aggregate and brick aggregate were mixed in various proportions (volume fraction) to prepare mixed recycled aggregate, and the natural aggregate was replaced by mixed recycled aggregate in 30% to produce concrete specimens for test. The experimental results indicate that the natural aggregate in mixed recycled aggregate concrete fails along the interface transition zone between the aggregate and the mortar, while the recycled brick coarse aggregate is fractured through the aggregate. When the brick content is less than 18%, there is no obvious effect on compressive strength and resistance of chloride penetration, and once the brick content is more than 18%, compressive strength and resistance of chloride penetration decrease obviously. The higher the content of brick is, the worse the salt frost resistance of concrete is. When the brick content is constant, the higher the water cement ratio is, the smaller the adverse effect of recycled brick coarse aggregate on the compressive strength of concrete.

Key words: mixed recycled coarse aggregate, concrete, chloride penetration resistance, cube compressive strength, salt frost resistance

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