Residual properties of recycled concrete after exposure to high temperatures

Chen Zongping; Chen Jianjia; Ning Fan; Li Yi

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Residual properties of recycled concrete after exposure to high temperatures

机译：再生混凝土在高温下的残留特性

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摘要

This paper presents the results of an experimental study on the residual properties of recycled concrete after exposure to high temperatures. Three parameters were considered in this test: (a) high temperatures (i.e. 20, 200, 300, 400, 500, 600, 700 and 800 degrees C); (b) recycled coarse aggregate replacement percentages (i.e. 0, 30, 50, 70 and 100%); (c) recycled coarse aggregate types (gravel and pebble). A total of 144 standard prism specimens (150 mm x 150 mm x 300 mm) of recycled concrete were prepared and subjected to different high temperatures for 1 h; after cooling down to ambient temperature, the following basic physical and mechanical properties were then tested and discussed: (a) surface change and mass loss ratio; (b) compressive strength; (c) compressive stress-strain curve; (d) elasticity modulus. Based on the mass loss ratio, a residual strength assessment method for recycled concrete after exposure to high temperatures was put forward.

机译：本文介绍了再生混凝土在高温下的残余性能的实验研究结果。在此测试中考虑了三个参数：（a）高温（即20、200、300、400、500、600、700和800摄氏度）；（b）回收的粗骨料替代百分比（即0、30、50、70和100％）；（c）再生的粗骨料类型（砾石和卵石）。总共准备了144块再生混凝土的标准棱镜试样（150毫米x 150毫米x 300毫米），并经受了不同的高温1小时。冷却至环境温度后，然后测试并讨论了以下基本物理和机械性能：（a）表面变化和质量损失比；（b）抗压强度；（c）压应力-应变曲线；（d）弹性模量。基于质量损失率，提出了再生混凝土高温暴露后的残余强度评估方法。

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来源
《Magazine of Concrete Research》 |2019年第16期|781-793|共13页
作者
Chen Zongping; Chen Jianjia; Ning Fan; Li Yi;
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作者单位

Guangxi Univ, Coll Civil Engn & Architecture, Nanning, Peoples R China|Chinese Minist Educ, Key Lab Disaster Prevent & Struct Safety, Nanning, Peoples R China;

Guangxi Univ, Coll Civil Engn & Architecture, Nanning, Peoples R China;

Guangxi Univ, Coll Civil Engn & Architecture, Nanning, Peoples R China;

Guangxi Univ, Coll Civil Engn & Architecture, Nanning, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
aggregates; compressive strength; temperature-related thermal effects;

机译：骨料;抗压强度;温度相关和热效应;

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专利

1. Residual properties of recycled concrete after exposure to high temperatures [J] . Chen Zongping, Chen Jianjia, Ning Fan, Magazine of Concrete Research . 2019,第15a16期

机译：高温暴露后再生混凝土的残余特性
2. Thermal and residual mechanical profile of recycled aggregate concrete prepared with carbonated concrete aggregates after exposure to elevated temperatures [J] . Xuan Dongxing, Zhan Baojian, Poon Chi Sun Fire and materials . 2018,第1期

机译：碳化混凝土骨料在高温下暴露后的再生骨料混凝土的热力学和残余力学性能
3. Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure [J] . Francisco B. Varona, Francisco Baeza-Brotons, Antonio J. Tenza-Abril, Materials . 2020,第8期

机译：高温暴露后再生骨料混凝土的残留抗压强度
4. Evaluation of residual mechanical properties of steel fiber-reinforced reactive powder concrete after exposure to high temperature using nondestructive testing [C] . Xiaomeng Hou, Muhammad Abid, Wenzhong Zheng Conference on Performance-based Fire and Fire Protection Engineering . 2018

机译：使用非破坏性测试在高温暴露于高温后钢纤维增强活性粉混凝土的残留力学性能评价
5. The effects of elevated temperatures on the residual properties of externally-bonded fibre reinforced polymer systems for concrete. [D] . Foster, Sarah Katherine. 2007

机译：高温对用于混凝土的外部粘结的纤维增强聚合物体系的残余性能的影响。
6. Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure [O] . Francisco B. Varona, Francisco Baeza-Brotons, Antonio J. Tenza-Abril, 2020

机译：高温暴露后再生骨料混凝土的残余抗压强度
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。
8. Mechanical Properties of High Performance Concrete after Exposure to ElevatedTemperatures [R] . Lawson, J. R., Phan, L. T., Davis, F. 2000

机译：高性能混凝土暴露后高性能混凝土的力学性能

Residual properties of recycled concrete after exposure to high temperatures

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