Abstract
The intention of this paper is to analyze the properties of coral aggregate concrete (CAC) that is reinforced by alkali-resistant glass fibers (ARGF) and the bond performance with BFRP (basalt fiber reinforced polymer) bars. Two types of ARGF, denoted by Type A and Type B with different manufacturing technologies and fiber lengths, are used in the test. Tests of compressive strength, splitting tensile strength, and flexural performance were performed on ARGF-CAC with four different contents for the two types of ARGF. It is found that the cubic compressive strength is slightly reduced when the fiber volume fraction exceeds 0.5%, but almost keeps invariable if the fiber content further increases. However, the tensile strength, residual strength retention and flexural toughness are improved as more ARGFs are added into CAC, and even higher with Type B ARGF addition. The optimized volume fraction is 1.5% for both the two types of ARGF based on the evaluation of the workability and mechanical performance. Moreover, central pull-out test was performed to study the bond properties of ARGF-CAC with BFRP bars. It is found that both the maximum average bond stress and residual frictional stress are generally reduced as the bond length is longer. The addition of Type B ARGFs can significantly improve the bond strength; however, the Type A ARGFs seem to have marginal effect.
Highlights
Concrete, as a commonly used construction material, can be widely used in civil engineering.Portland cement, river sands, and crushed stones are essential components in conventional concrete
Once the alkali-resistant glass fibers (ARGF)-coral aggregate concrete (CAC) is used in structures, the bond performance between Fiber-reinforced polymer (FRP) bars concrete in the aggressive environment is weakened if fly ash and silica fume are incorporated in the and ARGF-CAC
When the fiber content is below 0.5% by volume, the f cu almost keeps invariable for Type A ARGF, but shows a slight increase for Type B ARGF with the increasing of fiber content
Summary
As a commonly used construction material, can be widely used in civil engineering. As the curing age increases, some of the water in the pre-soaked aggregates would be released and further hydration reaction occurs, which results in subsequent strength improvement [20] Because both the seawater and coral aggregates may have high saline content, steel bar cannot be effectively used in reinforced CAC structures. ARGFs. Besides, once the ARGF-CAC is used in structures, the bond performance between FRP bars concrete in the aggressive environment is weakened if fly ash and silica fume are incorporated in the and ARGF-CAC is important it would dominate the reinforced structural behaviors. The bond performance between Basalt FRP (BFRP) bars and strength and resistance to chloride permeability of ARGF-CAC. Once the ARGF-CAC is used in structures, the bond performance between FRP bars and ARGF-CAC is important and it would dominate the structural
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