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作者:

Zhang, Jinxi (Zhang, Jinxi.) (学者:张金喜) | Wang, Jiangang (Wang, Jiangang.) | Li, Xinghai (Li, Xinghai.) | Zhou, Tongju (Zhou, Tongju.) | Guo, Yangyang (Guo, Yangyang.)

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EI Scopus SCIE

摘要:

Rapid-hardening controlled low strength material (CLSM) containing recycled fine aggregate from construction and demolition (C&D) waste was prepared with the sprayed concrete accelerator. Eleven mixtures were made with different accelerator-to-binder (A/B), water-to-solid (W/S) and binder-to-recycled fine aggregate (B/R) ratios. The workability (flowability and bleeding rate) of fresh mixture and the mechanical properties (early strength, long-term strength and dynamic elastic modulus) of hardened material were tested. The results show that adding (20 similar to 50%) accelerator reduces the bleeding rate of CLSM by 48.8 similar to 84.6%, with no significant effect on the flowability. Improved flowability of CLSM can be achieved by increasing the W/S or B/R ratio, with increased or reduced bleeding rate, respectively. The optimal A/B ratio for best early strength development is 40%, with the early hour strength (2 similar to 4 h) up to 0.41 0.79 MPa. When A/B ratio is held constant, the early strength of CLSM is affected by the amount of cementitious materials and the actual content of free water. An accurate predictive model for the long-term strength of CLSM was established through regression analysis, in which three control parameters are considered. A power function relationship between the compressive strength and the dynamic elastic modulus is also established. Dynamic elastic modulus can thus serve as an indicator for evaluation of the mechanical properties of CLSM. (C) 2018 Elsevier Ltd. All rights reserved.

关键词:

Controlled low strength material (CLSM) Recycled fine aggregate Rapid-hardening Mechanical properties Construction and demolition waste Workability

作者机构:

  • [ 1 ] [Zhang, Jinxi]Beijing Univ Technol, Dept Rd & Railway Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Wang, Jiangang]Beijing Univ Technol, Dept Rd & Railway Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Zhou, Tongju]Beijing Univ Technol, Dept Rd & Railway Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Guo, Yangyang]Beijing Univ Technol, Dept Rd & Railway Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Li, Xinghai]Beijing Rd Engn Qual Supervis Stn, Beijing 100076, Peoples R China

通讯作者信息:

  • 张金喜

    [Zhang, Jinxi]Beijing Univ Technol, Dept Rd & Railway Engn, Beijing 100124, Peoples R China

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来源 :

CONSTRUCTION AND BUILDING MATERIALS

ISSN: 0950-0618

年份: 2018

卷: 173

页码: 81-89

7 . 4 0 0

JCR@2022

ESI学科: MATERIALS SCIENCE;

ESI高被引阀值:260

JCR分区:1

被引次数:

WoS核心集被引频次: 41

SCOPUS被引频次: 51

ESI高被引论文在榜: 0 展开所有

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