Interfacial Behavior of Glass Fiber-Reinforced Polymer Bars Embedded in Concrete with Internal Curing Agents

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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.

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.