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Open AccessArticle

Fracture Properties and Softening Curves of Steel Fiber-Reinforced Slag-Based Geopolymer Mortar and Concrete

by Yao Ding 1 and Yu-Lei Bai 2,*
1
College of Civil Engineering, Chongqing University, Chongqing 400044, China
2
Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1445; https://doi.org/10.3390/ma11081445
Received: 14 July 2018 / Revised: 1 August 2018 / Accepted: 2 August 2018 / Published: 15 August 2018
(This article belongs to the Special Issue New and Emerging Construction Materials)
Adding short steel fibers into slag-based geopolymer mortar and concrete is an effective method to enhance their mechanical properties. The fracture properties of steel fiber-reinforced slag-based geopolymer concrete/mortar (SGC/SGM) and unreinforced control samples were compared through three-point bending (TPB) tests. The influences of steel fiber volume contents (1.0%, 1.5% and 2.0%) on the fracture properties of SGC and SGM were studied. Load-midspan deflection (P-δ) curves and load-crack mouth opening displacement (P-CMOD) curves of the tested beams were recorded. The compressive and splitting tensile strengths were also tested. The fracture energy, flexural strength parameters, and fracture toughness of steel fiber-reinforced SGC and SGM were calculated and analyzed. The softening curves of steel fiber-reinforced SGC and SGM were determined using inverse analysis. The experimental results show that the splitting tensile strength, fracture energy, and fracture toughness are significantly enhanced with fiber incorporation. A strong correlation between the equivalent and residual flexural strengths is also observed. In addition, the trilinear strain-softening curves obtained by inverse analysis predict well of the load-displacement curves recorded from TPB tests. View Full-Text
Keywords: slag-based geopolymer; concrete; mortar; short steel fibers; fracture property; softening curve slag-based geopolymer; concrete; mortar; short steel fibers; fracture property; softening curve
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Ding, Y.; Bai, Y.-L. Fracture Properties and Softening Curves of Steel Fiber-Reinforced Slag-Based Geopolymer Mortar and Concrete. Materials 2018, 11, 1445.

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