Practical Prediction Models of Tensile Strength and Reinforcement-Concrete Bond Strength of Low-Calcium Fly Ash Geopolymer Concrete

Chenchen Luan; Qingyuan Wang; Fuhua Yang; Kuanyu Zhang; Nodir Utashev; Jinxin Dai; Xiaoshuang Shi

doi:10.3390/polym13060875

Practical Prediction Models of Tensile Strength and Reinforcement-Concrete Bond Strength of Low-Calcium Fly Ash Geopolymer Concrete

Polymers (Basel). 2021 Mar 12;13(6):875. doi: 10.3390/polym13060875.

Authors

Chenchen Luan^{1

2}, Qingyuan Wang^{1

2

3}, Fuhua Yang^{1

2}, Kuanyu Zhang^{1

2}, Nodir Utashev², Jinxin Dai^{1

2}, Xiaoshuang Shi^{1

2}

Affiliations

¹ Key Laboratory of Deep Underground Science and Engineering (Ministry of Education), Department of Architecture and Environment, Sichuan University, Chengdu 610065, China.
² Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Lab of Sichuan Province, Chengdu 610065, China.
³ Department of Mechanical Engineering, Chengdu University, Chengdu 610106, China.

Abstract

There have been a few attempts to develop prediction models of splitting tensile strength and reinforcement-concrete bond strength of FAGC (low-calcium fly ash geopolymer concrete), however, no model can be used as a design equation. Therefore, this paper aimed to provide practical prediction models. Using 115 test results for splitting tensile strength and 147 test results for bond strength from experiments and previous literature, considering the effect of size and shape on strength and structural factors on bond strength, this paper developed and verified updated prediction models and the 90% prediction intervals by regression analysis. The models can be used as design equations and applied for estimating the cracking behaviors and calculating the design anchorage length of reinforced FAGC beams. The strength models of PCC (Portland cement concrete) overestimate the splitting tensile strength and reinforcement-concrete bond strength of FAGC, so PCC's models are not recommended as the design equations.

Keywords: cracking behaviors; design anchorage length; low-calcium fly ash geopolymer concrete; regression analysis; reinforcement-concrete bond strength; tensile strength.

Abstract

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