Bond Behavior between BFRP Bars and Hybrid Fiber Recycled Aggregate Concrete after High Temperature

Zhu, B.; Liu, Huaxin; Liu, Genjin; Hussain, Abasal; Zhang, Xiaofei; Wang, Xuezhi

doi:10.32604/jrm.2021.013580

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…The mix proportion of benchmark concrete was mass (cement): mass (sand): mass (coarse aggregate) = 1: 1.46: 2.06, and the water-binder ratio was 0.48. The volume content of BF and CF was set to be 0.15 % and 0.2 % of the concrete volume, respectively, based on existing research (31,32). The target temperature was set to be 20 °C, 100 °C, 200 °C, 300 °C, 400 °C and 500 °C.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Liu,

et al. 2024

Mater. constr.

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This research investigated the bond properties at high temperatures and with hybrid fiber addition between basalt fiber reinforced polymer (BFRP) bars and hybrid fiber-reinforced concrete (HFRC). The tensile strength and appearance morphology of BFRP bars were analyzed. Used scanning electron microscopy (SEM) to examine the microscopic morphology and used the bond-slip constitutive model to fit the bond-slip curves. When BFRP bars after exposed to 300 °C, their tensile strength dropped by 42%. With the increasing temperature, the bond strength and stiffness of normal concrete (NC) specimens decreased by 27.3 % and 67.5 %, respectively, while HFRC specimens decreased by 20.8 % and 55 %, respectively. Hybrid fibers increased the bond strength and stiffness of HFRC specimens by 27.1 % and 49.1 %, respectively. The best fitting models were the Malvar model and the Continuous Curve model.

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Section: Methodsmentioning

confidence: 99%

Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Liu,

et al. 2024

Mater. constr.

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“…This test focused on the qualitative study, so the effect of various fiber volume fractions was not investigated. The volume content of CF and BF were set as 0.15% and 0.2% of the concrete volume, respectively, and the number of freeze-thaw cycles was set as 0, 25, 50, 75, and 100, based on references [33,34]. Three specimens from each of the 10 groups of cube center…”

Section: Design Of Pull-out Specimensmentioning

confidence: 99%

“…Data processing and sample training. A database of 96 groups of test results of FRP bars pull-out specimens [17,33,34,[54][55][56][57] was collected as training samples for a BP neural network in this investigation. A total of 10 factors, including the number of freeze-thaw cycles, types of FRP bars types, FRP bar diameter, surface treatment of bars, bond anchorage length, compressive strength of concrete, failure mode, BF volume content, CF volume content, and recycled aggregate replacement rate, were used as input parameters, with bond strength as an output parameter.…”

Section: Plos Onementioning

confidence: 99%

Bond performance between hybrid fiber-reinforced concrete and BFRP bars under freeze-thaw cycle

2024

PLoS ONE

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This study applied the pull-out test to examine the influence of freeze-thaw cycles and hybrid fiber incorporation on the bond performance between BFRP bars and hybrid fiber-reinforced concrete. The bond-slip curves were fitted by the existing bond-slip constitutive model, and then the bond strength was predicted by a BP neural network. The results indicated that the failure mode changed from pull-out to splitting for the BFRP bar ordinary concrete specimens when the freeze-thaw cycles exceeded 50, while only pull-out failure occurred for all BFRP bar hybrid fiber-reinforced concrete specimens. An increasing trend was shown on the peak slip, but a decreasing trend was shown on the bond stiffness and bond strength when freeze-thaw cycles increased. The bond strength could be increased significantly by the incorporation of basalt fiber (BF) and cellulose fiber (CF) under the same freezing and thawing conditions as compared to concrete specimens without fibers. The Malvar model and the Continuous Curve model performed best in fitting the ascending and descending sections of the bond-slip curves, respectively. The BP neural network also accurately predicted the bond strength, with relative errors of predicted bond strengths ranging from 3.75% to 13.7%, and 86% of them being less than 10%.

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“…It has been reported that the water absorption of natural aggregate is usually less than 1%, while the water absorption of RCA is between 3.6% and 8.0% [5]. Therefore, pre-wetting before using RCA to prepare concrete is usually necessary [6], otherwise, the concrete mixed with RCA has low workability and a significant reduction in mechanical properties and durability [7][8][9]. In addition, the RCA has such defects as large porosity, high crushing index, low apparent density and irregular particle shape [10,11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Various Modification Methods for Enhancing the Performance of Recycled Concrete Aggregate

Liu¹,

Liu²,

Zuo³

et al. 2022

Journal of Renewable Materials

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Due to the existence of the attached mortar, the performance of the recycled concrete aggregate (RCA) is inferior to the natural aggregate, which significantly limits its wide application in industry. In this study, five kinds of modified solutions were used to modify the surface of RCA, and the modification effects were compared. The results showed that sodium silicate, nano-silica (NS), Bacillus pasteurii and soybean powder had relatively good modification effects on RCA, which could reduce the crushing value and water absorption, and increase apparent density. The composite solution (15% sodium silicate and 2% NS) and soybean powder solution had better modification effect. The 28 d compressive strength and splitting tensile strength of recycled aggregate concrete (RAC) prepared by RCA modified by soybean powder solution were 4.6% and 5.2% higher than those prepared by RCA modified by composite solution, respectively. This indicates that among the five kinds of modified solutions, soybean powder solution has the best modification effect on RCA, and the optimal soaking time of soybean powder solution is 8 h. At this time, the crushing value, water absorption and apparent density of RCA are 12.8%, 5.3%, and 2653 kg/m 3 , respectively. The research results of this study provide a reference for the modification of RCA and its efficient utilization.

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Bond Behavior between BFRP Bars and Hybrid Fiber Recycled Aggregate Concrete after High Temperature

Cited by 5 publications

References 27 publications

Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Bond performance between hybrid fiber-reinforced concrete and BFRP bars under freeze-thaw cycle

Evaluation of Various Modification Methods for Enhancing the Performance of Recycled Concrete Aggregate

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