Concentrically Loaded Recycled Aggregate Geopolymer Concrete Columns Reinforced with GFRP Bars and Spirals

2021 ◽  
pp. 113968
Author(s):  
Ali Raza ◽  
Allan C. Manalo ◽  
Umer Rafique ◽  
Omar S. AlAjarmeh ◽  
Qaiser uz Zaman Khan
Keyword(s):  
Concrete Columns ◽  
Recycled Aggregate ◽  
Geopolymer Concrete ◽  
Gfrp Bars

scholarly journals Study a Structural Behavior of Eccentrically Loaded GFRP Reinforced Columns Made of Geopolymer Concrete

2020 ◽  
Vol 6 (3) ◽  
pp. 563-575
Author(s):  
Hussein Talab Nhabih ◽  
Ahmed M. Hussein ◽  
Marwa Marza Salman
Keyword(s):  
Ultimate Load ◽  
Concrete Columns ◽  
Concrete Column ◽  
Geopolymer Concrete ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Gfrp Bars ◽  
Short Columns ◽  
Steel Bars ◽  
Normal Strength

This study investigated a modern composite material, which is a short geopolymer concrete column (GPCC) reinforced by GFRP bars. The structural performances of GPCC subjected to eccentric load were studied and compared to the normal strength concrete column (NSCC) reinforced by steel bars. In this study, the primary experimental parameters were the reinforcement bars types, load eccentricity, and concrete types. Seven short columns were tested: three normal strength concrete columns reinforced by steel bars, three geopolymer concrete columns reinforced by GFRP bars and one normal strength concrete column without reinforcement. The model dimensions chosen in the present study was a square section of 130×130 mm and a total height of 850 mm. It was shown that the steel bars contribute about 16.47% of column capacity under concentric load. Comparing with the normal strength concrete column, a geopolymer concrete column reinforced by GFRP bars showed a little increase in ultimate load (5.17%) under concentric load. Under the load eccentricity of 130 mm, a geopolymer concrete column reinforced by GFRP bars showed a significant increase in the ultimate load (69.37%). Under large eccentricity, a geopolymer concrete column reinforced by GFRP bars has an outstanding effect on the columns' ultimate load capacity. Also, the sine form can be utilized for GPCC to find the lateral deflection along with the column high at different load values up to the failure.

Structural behavior of GFRP reinforced recycled aggregate concrete columns with polyvinyl alcohol and polypropylene fibers

2021 ◽  
pp. 136943322110179
Author(s):  
Umer Rafique ◽  
Ather Ali ◽  
Ali Raza
Keyword(s):  
Research Study ◽  
Concrete Columns ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Polypropylene Fibers ◽  
Hybrid Fibers ◽  
Cracking Behavior ◽  
Axial Strength ◽  
Gfrp Bars ◽  
Concentric Loading

The objective of this research study is to demonstrate the axial compressive behavior of GRFC columns by fabricating five circular columns (1150 mm high and 250 mm in cross-section) and testing them under axial concentric loading. Two different kinds of fibers, that is, polyvinyl alcoholfibers (PVA) and polypropylene fibers (PPF) were incorporated into the concrete. Two types of transverse confinement (GFRP hoops and GFRP spirals) were provided. The efficiency of GFRP hoops was explored by providing them at the spacing of 75 mm, 150 mm, and 250 mm, respectively. The efficiency of GFRP spirals was examined by keeping the spacing of 38 mm and 75 mm, respectively. The GRFC columns confined with GFRP spirals portrayed higher axial strength and higher ductility indices. Furthermore, an extensive finite element modeling (FEM) was performed by considering the effect of hybrid fibers using a modified concrete damaged plastic (CDP) model. The proposed FEM captured the axial response and cracking behavior of GRFC columns with high accuracy. This study also proposed a new empirical model for capturing the axial strength of GRFC columns by considering the influence of GFRP bars and lateral confinement of GFRP hoops/spirals.

Experimental Investigation of Rectangular Air-Cured Geopolymer Concrete Columns Reinforced with GFRP Bars and Stirrups

2019 ◽  
Vol 23 (3) ◽  
pp. 04019011 ◽  
Author(s):  
M. Elchalakani ◽  
M. Dong ◽  
A. Karrech ◽  
G. Li ◽  
M. S. Mohamed Ali ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Concrete Columns ◽  
Geopolymer Concrete ◽  
Gfrp Bars

scholarly journals On the Structural Performance of Recycled Aggregate Concrete Columns with Glass Fiber-Reinforced Composite Bars and Hoops

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1508
Author(s):  
Ali Raza ◽  
Ahmad Rashedi ◽  
Umer Rafique ◽  
Nazia Hossain ◽  
Banjo Akinyemi ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Compressive Loading ◽  
Reinforcement Ratio ◽  
Recycled Aggregate Concrete ◽  
Experimental Results ◽  
Recycled Aggregate ◽  
Fiber Reinforced ◽  
Aggregate Concrete ◽  
Gfrp Bars ◽  
Glass Fiber Reinforced

Structural members comprising geopolymer recycled aggregate concrete (RAC) reinforced with glass fiber-reinforced polymer (GFRP) bars have not been investigated appropriately for axial compressive loading cases. The present study addresses this knowledge gap by evaluating the structural efficiency of GFRP-reinforced geopolymer recycled aggregate concrete (GGRAC)-based members subjected to axial compressive loading. A total of nine compressive members (250 mm in cross-section and 1150 mm in height) were constructed to examine the effect of the number of longitudinal GFRP bars and the vertical spacing of transverse GFRP hoops/ties. The experimental results portrayed that the ductility of GGRAC compressive members improved with the reduction in the pitch of GFRP hoops. The axial load-carrying capacity (LCC) of GGRAC compressive members increased by increasing the number of GFRP bars up to eight (corresponding to a reinforcement ratio of 2.11%) while it decreased by using ten longitudinal GFRP bars (corresponding to a reinforcement ratio of 2.65%). Additionally, an empirical model was suggested to predict the axial LCC of GGRAC compressive members based on a large amount of experimental data of similar members. The experimental results and related theoretical predictions substantially prove the applicability and accuracy of the proposed model. The proposed column represents a feasible structural member in terms of material availability and environmental sustainability.

scholarly journals Axial compression behavior of reinforced geopolymer concrete columns with demolished concrete lumps

2017 ◽  
Vol 210 ◽  
pp. 203-210
Author(s):  
Zhi-Jian Zhang ◽  
Hai-Yan Zhang ◽  
Jun-Hong Zheng ◽  
Kai-Hang Lin ◽  
Yi Su
Keyword(s):  
Axial Compression ◽  
Concrete Columns ◽  
Geopolymer Concrete ◽  
Compression Behavior

Bond Stress-Slip Behavior: Case of GFRP Bars in Geopolymer Concrete

2015 ◽  
Vol 27 (1) ◽  
pp. 04014116 ◽  
Author(s):  
Ginghis Maranan ◽  
Allan Manalo ◽  
Karu Karunasena ◽  
Brahim Benmokrane
Keyword(s):  
Bond Stress ◽  
Geopolymer Concrete ◽  
Gfrp Bars

scholarly journals Resistance of Acid Attack on Geopolymer Concrete Developed with Partial Replacement of Course Aggregate by Recycled Aggregate

2019 ◽  
Vol 8 (4) ◽  
pp. 12142-12146
Keyword(s):  
Fly Ash ◽  
Coarse Aggregate ◽  
Recycled Aggregate ◽  
Partial Replacement ◽  
Geopolymer Concrete ◽  
Acid Attack ◽  
Great Strength ◽  
Conventional Concrete ◽  
Existing Structures ◽  
Binder Material

Geopolymer concrete is one of the major developments in recent years resulting in utilization of fly ash in huge quantities and eventually reducing cement consumption and ultimately reducing emission of greenhouse gases.The geopolymer concrete is produced by using activated fly ash as binder material instead of cement. Geopolymer concrete accomplishes great strength and looks similar to conventional concrete. Recycled coarse aggregate (RCA )which is coming from demolition of construction of old and existing structures has been used in this study. The durability property; acid attack resistance with partial replacement of coarse aggregate by recycled aggregate in geopolymer and conventional concrete for the different composition such as 10, 20, 30 and 40percentage for a period of 15, 45,75 and 105 days has been evaluated. From the results it was observed that in both natural and recycled aggregate of Geopolymer concrete is highly resistant to acids such as sulphuric acid and hydrochloric acid compared to conventional concrete of respective aggregates.

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