Influence of steel fibres on tension stiffening and cracking of reinforced geopolymer concrete

Ganesan, N.; Indira, P. V.; Santhakumar, Anjana

doi:10.1680/macr.13.00273

Cited by 22 publications

(15 citation statements)

References 19 publications

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“…In recent years, the researches on the effects of steel fibers are mainly focused on tension, shear, and flexural strengths. Liu et al [[6]] studied tensile properties of glass fiber; Gansenan et al [ [7]] examined the influence of steel fibers on tension stiffening of concrete. Ashour et al [ [8]] and Kwak et al [ [9]] studied the shear behavior of high-strength fiber reinforced concrete beams.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Effects of Steel and Glass Fibers on Engineering Properties of Concrete: Engineering Properties of Concrete

Âkbari

Abed

2020

Frattura Ed Integrità Strutturale

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This paper experimentally investigates the effect of steel and glass fibers on the engineering properties of concrete. To achieve this, 0.3%, 0.6%, and 0.9% by volume fraction of steel and glass fibers are added in concrete mixtures with water-to-cement (W/C) ratios 0.35 and 0.45. For each ratio of water to cement, 21 cubic samples for compressive strength tests, 14 cylindrical samples for tension strength tests, and also 14 prismatic samples for three-point flexural strength tests were prepared. The experimental results show that adding 0.3% to 0.9% % steel fibers for concrete increases simultaneously the compressive, tension, and also flexural strengths in comparison with plain concrete. Adding glass fibers only between 0.3% to 0.6% increases the compressive strength. The results reveal that the best range for reinforcing concrete with steel fiber is 0.3% to 0.9 % and glass fiber is 0.3% to 0.6 % by volume fraction of fiber to improve the engineering strengths concrete. As a rule of thumb, the tension and flexural strengths of concrete could be explained as 8% and 13% of the compressive strength, respectively.

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Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Effects of Steel and Glass Fibers on Engineering Properties of Concrete: Engineering Properties of Concrete

Âkbari

Abed

2020

Frattura Ed Integrità Strutturale

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“…The characteristics of the fibers depend on many factors such as fiber size, fiber type, elastic properties, aspect ratio (ratio of length to diameter-L/D) and fiber volume fraction. Each type of fiber can be useful for some specific function [97]. Several studies on the effect of different fibers on the geopolymer matrix will be presented below.…”

Section: Geopolymer Matrix Composites Reinforced With Natural Fibersmentioning

confidence: 99%

Untitled

2018

RDMS

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Geopolymers are a new class of high performance materials able to replace traditional Portland cement due to its excellent mechanical properties, high initial resistance and durability. The raw material used for the production of geopolymers generally consists of industrial wastes such as fly ash and met kaolin, both rich in silica and alumina. Thus, geopolymers are an economically viable alternative for minimizing environmental impact by carbon sequestration. Although extremely resistant, their mechanical properties can be improved by the insertion of reinforcing agents. Among them, the fibers improve several properties such as tensile strength and toughness; besides allow controlling the cracking mechanism and the ductility of the geopolymer composites. Among the fibers used as geopolymer reinforcement the metallic, inorganic, organic and natural fibers should be highlighted. Each of these reinforcement materials influences positively the mechanical properties of the geopolymer composite, thus favoring a wide range of applications, especially in civil construction. Therefore, the objective of this work was to study the influence of the addition of different fibers on the mechanical properties of geopolymer matrix composites.

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“…Adding FA to OPC concrete members subjected to impact and dynamic loads is also recommended to enhance the microcrack resistance [21]. The complete replacement of OPC concrete with FA has been widely assessed [22][23][24][25][26][27][28][29][30][31]. However, most of the previous studies on AA concrete have focused mainly on the mix design and microscale investigation [22][23][24], which supports the potential of FA as a promising building material [24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Tension Stiffening and Cracking Behavior of Axially Loaded Alkali-Activated Concrete

Abdulrahman,

Muhamad,

Shukri

et al. 2023

Materials

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Alkali-activated concrete is an eco-friendly construction material that is used to preserve natural resources and promote sustainability in the construction industry. This emerging concrete consists of fine and coarse aggregates and fly ash that constitute the binder when mixed with alkaline activators, such as sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). However, understanding its tension stiffening and crack spacing and width is of critical importance in fulfilling serviceability requirements. Therefore, this research aims to evaluate the tension stiffening and cracking performance of alkali-activated (AA) concrete. The variables considered in this study were compressive strength (fc) and concrete cover-to-bar diameter (Cc/db) ratios. After casting the specimen, they were cured before testing at ambient curing conditions for 180 days to reduce the effects of concrete shrinkage and obtain more realistic cracking results. The results showed that both AA and OPC concrete prisms develop slightly similar axial cracking force and corresponding cracking strain, but OPC concrete prisms exhibited a brittle behavior, resulting in a sudden drop in the load–strain curves at the crack location. In contrast, AA concrete prisms developed more than one crack simultaneously, suggesting a more uniform tensile strength compared to OPC specimens. The tension-stiffening factor (β) of AA concrete exhibited better ductile behavior than OPC concrete due to the strain compatibility between concrete and steel even after crack ignition. It was also observed that increasing the confinement (Cc/db ratio) around the steel bar delays internal crack formation and enhances tension stiffening in AAC. Comparing the experimental crack spacing and width with the values predicted using OPC codes of practice, such as EC2 and ACI 224R, revealed that EC2 tends to underestimate the maximum crack width, while ACI 224R provided better predictions. Thus, models to predict crack spacing and width have been proposed accordingly.

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Influence of steel fibres on tension stiffening and cracking of reinforced geopolymer concrete

Cited by 22 publications

References 19 publications

Experimental Evaluation of Effects of Steel and Glass Fibers on Engineering Properties of Concrete: Engineering Properties of Concrete

Experimental Evaluation of Effects of Steel and Glass Fibers on Engineering Properties of Concrete: Engineering Properties of Concrete

Untitled

Tension Stiffening and Cracking Behavior of Axially Loaded Alkali-Activated Concrete

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