Abstract
The current research on concrete and cementitious materials focuses on finding sustainable solutions to address critical issues, such as increased carbon emissions, or corrosion attack associated with reinforced concrete structures. Geopolymer concrete is considered to be an eco-friendly alternative due to its superior properties in terms of reduced carbon emissions and durability. Similarly, the use of fibre-reinforced polymer (FRP) bars to address corrosion attack in steel-reinforced structures is also gaining momentum. This paper investigates the bond performance of a newly developed self-compacting geopolymer concrete (SCGC) reinforced with basalt FRP (BFRP) bars. This study examines the bond behaviour of BFRP-reinforced SCGC specimens with variables such as bar diameter (6 mm and 10 mm) and embedment lengths. The embedment lengths adopted are 5, 10, and 15 times the bar diameter (db), and are denoted as 5 db, 10 db, and 15 db throughout the study. A total of 21 specimens, inclusive of the variable parameters, are subjected to direct pull-out tests in order to assess the bond between the rebar and the concrete. The result is then compared with the SCGC reinforced with traditional steel bars, in accordance with the ACI 440.3R-04 and CAN/CSA-S806-02 guidelines. A prediction model for bond strength has been proposed using artificial neural network (ANN) tools, which contributes to the new knowledge on the use of Basalt FRP bars as internal reinforcement in an ambient-cured self-compacting geopolymer concrete.
Highlights
A prediction model for bond strength has been proposed using artificial neural network (ANN) tools, which contributes to the new knowledge on the use of Basalt fibre-reinforced polymer (FRP) bars as internal reinforcement in an ambient-cured self-compacting geopolymer concrete
This study will investigate the effects of bar diameter and embedment length on the bond behaviour of the pull-out specimens made of basalt FRP (BFRP)- and steel bar-reinforced
The bond behaviour of basalt-FRP-reinforced, newly developed selfcompacting geopolymer concrete was investigated by conducting direct pull-out tests on 21 specimens under ambient-cured conditions
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The use of sustainable geopolymer concrete in conjunction with fibre-reinforced polymer (FRP) bars ought to resolve the corrosion issues of traditional reinforced structures [3]. Even though FRP bars are durable, lightweight, and stronger compared to conventional steel reinforcement, the wider application of these bars is limited due to the lack of research on their wider properties, including those relating to bond behaviour—bonding with concrete and structural performance [13,14,15]. Direct pull-out tests have been carried out in order to study the bond strength of basalt FRP bars reinforcing a newly developed self-compacting geopolymer concrete (SCGC) [8]. Based on the outcomes from the experimental investigation, a prediction model has been developed for the bond strength and anchorage length of the BFRP-reinforced SCGC specimens
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