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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

37卷

期数:

2020年02期

页码:

20-26

栏目:

出版日期:

2020-03-30

文章信息/Info

Title:

Investigation on Low-strength Recycled Concrete and Its Application

文章编号:

1673-2049(2020)02-0020-07

作者:

肖建庄,张航华,唐晨隽,陈宣宇,段珍华,张青天

(同济大学 土木工程学院,上海 200092)

Author(s):

XIAO Jian-zhuang, ZHANG Hang-hua, TANG Chen-jun, CHEN Xuan-yu, DUAN Zhen-hua, ZHANG Qing-tian

(College of Civil Engineering, Tongji University, Shanghai 200092, China)

关键词:

废混凝土;  再生骨料;  再生微粉;  泡沫再生混凝土;  特性材料拦阻系统

Keywords:

waste concrete;  recycled aggregate;  recycled powder;  recycled foamed concrete;  engineered materials arresting system

分类号:

TU528

DOI:

10.19815/j.jace.2018.02009

文献标志码:

A

摘要:

通过疏理和分析国内外文献,结合试验论证,为建筑固废资源化提供一个新思路,即利用由废混凝土生产的再生原料(再生骨料和再生微粉)制备泡沫再生混凝土。阐述了再生骨料和再生微粉的加工工艺和复杂特性,分别介绍了再生混凝土和泡沫混凝土的力学性能及应用,并重点分析了影响泡沫混凝土性能的主要因素。充分利用再生混凝土与泡沫混凝土的自身特点,将两者进行有效结合,提出了一种低强功能化泡沫再生混凝土的制备方法,并确定了可行的配合比。最后,对这一研究方向进行了展望,提出了拦阻系统被破坏后现场实现二次、多次再生的可能性,使其具有更高的利用价值。研究结果表明:在同一种配合比下,泡沫混凝土的强度和密度远低于再生混凝土; 用再生细骨料取代标准砂后,所得泡沫再生混凝土的强度和密度会进一步降低; 所制备的泡沫再生混凝土符合规范《特性材料拦阻系统》(MH/T 5111—2015)中提出的耗能曲线要求,验证了将其用作机场跑道端末端安全区特性材料拦阻系统的可行性。

Abstract:

A method of recycling construction and demolition waste was provided based on the analysis of previous investigations and experimental verifications. The recycled materials, including recycled aggregate(RA)and recycled powder(RP), could be used to produce a new kind of recycled foamed concrete. The processing technique and properties of RA and RP were introduced. Mechanical behaviors and application of recycled concrete(RC)and foamed concrete were assessed, especially the major influence factors on property of foamed concrete. Based on this, an effective combination of RC and foamed concrete was proposed. A kind of recycled foamed concrete with proposed mix proportion was produced and tested to confirm the mechanical behaviors. Finally, some further research was suggested. The possibility of recycling the engineered materials arresting system(EMAS)materials for second or even multiple times after destroyed was put forward, which made the applicability of this material more valuable. The results show that, with the same mixture, the strength and density of foamed concrete are much lower than those of RC. The strength and density of foamed concrete will be further reduced by totally replacing the sand with recycled fine aggregate. In addition, the recycled foamed concrete can meet the requirements of energy dissipation ability in the code Engineered Materials Arresting System(MH/T 5111—2015), which validates the feasibility to apply this kind of concrete in the EMAS at the runway end safety area(RESA).

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相似文献/References:

[1]马士宾,牛宗岳,刘月钊,等.建筑垃圾再生骨料性能强化研究进展[J].建筑科学与工程学报,2022,39(06):1.[doi:10.19815/j.jace.2021.09011]
　MA Shi-bin,NIU Zong-yue,LIU Yue-zhao,et al.Research Progress on Performance Enhancement of Recycled Aggregate from Construction Waste[J].Journal of Architecture and Civil Engineering,2022,39(02):1.[doi:10.19815/j.jace.2021.09011]

备注/Memo

备注/Memo:

收稿日期:2019-06-11
基金项目:国家自然科学基金项目(51661145023)
作者简介:肖建庄(1968-),男,山东沂南人,教授,博士研究生导师,工学博士,E-mail:jzx@tongji.edu.cn。

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更新日期/Last Update: 2020-04-21