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作者:

Ding, Yao (Ding, Yao.) | Bai, Yu-Lei (Bai, Yu-Lei.) (学者:白玉磊) | Dai, Jian-Guo (Dai, Jian-Guo.) | Shi, Cai-Jun (Shi, Cai-Jun.)

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摘要:

This paper aimed to determine the softening laws and fracture toughness of slag-based geopolymer (SG) concrete and mortar (SGC and SGM) as compared to those of Portland cement (PC) concrete and mortar (PCC and PCM). Using three-point bending (TPB) tests, the load vs. mid-span displacement, crack mouth opening displacement, and crack tip opening displacement curves (P-d, P-CMOD, and P-CTOD curves) were all recorded. Bilinear softening laws of the PC and SG series were determined by inverse analysis. Furthermore, the cohesive toughness was predicted using an analytical fracture model. The cohesive toughness obtained by experimental study was consistent with that predicted by analytical method, proving the correctness of the tension softening law obtained from inverse analysis. In addition, both initial and unstable fracture toughness values of SG mortar were lower than those of PC mortar given the same compressive strength. Moreover, the initial fracture toughness of SG concrete was generally lower than that of PC concrete, whereas the unstable fracture toughness exhibited an opposite trend.

关键词:

slag-based geopolymer mortar concrete fracture toughness softening law TPB test

作者机构:

  • [ 1 ] [Ding, Yao]Chongqing Univ, Coll Civil Engn, Chongqing 400044, Peoples R China
  • [ 2 ] [Bai, Yu-Lei]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100000, Peoples R China
  • [ 3 ] [Dai, Jian-Guo]Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong 999077, Peoples R China
  • [ 4 ] [Shi, Cai-Jun]Hunan Univ, Coll Civil Engn, Changsha 410000, Peoples R China

通讯作者信息:

  • [Dai, Jian-Guo]Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong 999077, Peoples R China

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来源 :

MATERIALS

年份: 2020

期: 22

卷: 13

3 . 4 0 0

JCR@2022

ESI学科: MATERIALS SCIENCE;

ESI高被引阀值:169

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WoS核心集被引频次: 2

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