Title:
Interfacial Behavior of Glass Fiber-Reinforced Polymer Bars Embedded in Concrete with Internal Curing Agents
Author(s):
Yail J. Kim and Jun Wang
Publication:
Structural Journal
Volume:
113
Issue:
3
Appears on pages(s):
595-604
Keywords:
glass fiber-reinforced polymer (GFRP); interface; internal curing; multi-material interaction.
DOI:
10.14359/51688068
Date:
5/1/2016
Abstract:
This paper presents an experimental investigation into the interfacial behavior of glass fiber-reinforced polymer (GFRP) bars embedded in concrete mixed with internal curing agents. Such an innovative concept to achieve high-performance concrete (HPC) structures has a number of advantages—for example, improved early-age cracking resistance and long-term sustainability. Of interest is the interaction between the noncorrosive GFRP and the internally cured concrete when mechanically loaded. Three types of presaturated internal curing agents—namely, microporous lightweight aggregate (LWA), crushed returned concrete aggregate (CCA), and superabsorbent polymer (SAP)—are employed to supply necessary moisture inside the concrete so that autogenous shrinkage is controlled, along with minimizing self-desiccation and expediting cement hydration. The effect of various replacement or addition ratios of the curing agents is examined in terms of concrete strength, surface friction, and interfacial stresses. A refined bondslip relationship is established in accordance with test observations and probability-based simulation. Simplified design equations are proposed to estimate the embedment length of GFRP bars for the application of internally cured concrete.
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