Cost-Benefit Analysis of Using Recycled Coarse Aggregate In Plain and Fiber Reinforced Concrete

Awchat, Ganesh

doi:10.12913/22998624/139205

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…The total cost saving in construction due to the use of steel fibers in replacement of conventional steel reinforcing bars can be as high as 30% [55]. Previous studies have also verified that the extra cost caused by the inclusion of steel fibers could be counteracted significantly by quantified sustainable benefits of RCAs in an optimum concrete mixture [56][57][58]. Future research should focus on studying the interaction between the structural performance, environmental benefits, and associated costs using quantifiable measures and life cycle assessment concepts.…”

Section: Discussionmentioning

confidence: 99%

Shear Response of Recycled Aggregates Concrete Deep Beams Containing Steel Fibers and Web Openings

et al. 2022

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Replacement of natural aggregates (NAs) with recycled concrete aggregates (RCAs) in complex reinforced concrete (RC) structural elements, such as deep beams with openings, supports environmental sustainability in the construction industry. This research investigates the shear response of RC deep beams with openings made with 100% RCAs. It also examines the effectiveness of using steel fibers as a replacement to the minimum conventional steel stirrups in RCA-based deep beams with web openings. A total of seven RC deep beams with a shear span-to-depth ratio (a/h) of 0.8 were constructed and tested. A circular opening with an opening height-to-depth ratio (h0/h) of 0.3 was placed in the middle of each shear span. Test parameters included the type of the coarse aggregate (NAs and RCAs), steel fiber volume fraction (vf = 1, 2, and 3%), and presence of the minimum conventional steel stirrups. The deep beam specimens with web openings made with 100% RCAs exhibited 13 to 18% reductions in the shear capacity relative to those of their counterparts made with NAs. The inclusion of conventional steel stirrups in RC deep beams with openings was less effective in improving the shear response when 100% RCAs was used. The addition of steel fibers remarkably improved the shear response of the tested RCA-based beams. The gain in the shear capacity of the RCA-based beams caused by the inclusion of steel fibers was in the range of 39 to 84%, whereas the use of conventional steel stirrups resulted in 18% strength gain. The use of 1% steel fiber volume fraction in the RCA-based beam with openings without steel stirrups was sufficient to restore 96% of the original shear capacity of the NA-based beam with conventional steel stirrups. The shear capacities obtained from the tests were compared with predictions of published analytical models. The predicted-to-measured shear capacity was in the range of 0.71 to 1.49.

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Section: Discussionmentioning

confidence: 99%

Shear Response of Recycled Aggregates Concrete Deep Beams Containing Steel Fibers and Web Openings

et al. 2022

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“…As concrete is weak in tension, fi bers are generally provided in high tensile zones to strengthen concrete and reduce crack width [67,68]. Synthetic fi bers such as glass, steel, asbestos, carbon [69] and other polymers are generally used in fi ber reinforced concrete, but with scarcity and high energy demands of synthetic fi bers, the use of recycled aggregates [70] or naturally available fi bers such as wood, coconut, hemp, sisal and rice husk and bamboo are encouraged in fi ber reinforced concrete [71][72][73][74][75][76].…”

Section: Bamboo Fi Ber Reinforced Concretementioning

confidence: 99%

Bamboo as a Construction Material: Prospects and Challenges

Fahim¹,

Haris²,

Khan³

et al. 2022

Adv. Sci. Technol. Res. J.

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Bamboo is a naturally available, fast growing and renewable resource. Bamboo plants are found all over the world in tropical and non-tropical regions. Asia pacific region is specifically rich in bamboo biodiversity. Due to high energy demand of existing construction materials and scarcity of other naturally available materials like wood, bamboo is a good alternative for construction. This paper reviews the mechanical properties and use of bamboo in construction. The tensile strength of different bamboo species varies in the range 70-210 MPa, compressive strength 20-65 MPa, elastic modulus 2500-17500 MPa, and modulus of rupture 50-200 MPa. Bamboo is a versatile material and can be used in construction in various ways. Bamboo can be engineered to specific need in construction such as laminated and scrimber bamboo. Engineered bamboo are used for various housing purposes such as roofing and flooring. Bamboo culms are often used directly without any alteration as structural members such as beams and columns. Bamboo can also be used as reinforcement in concrete as a replacement to steel. The shear and flexural behavior of bamboo reinforced concrete (BRC) beams is significantly better than plain concrete beams. Bamboo fibers reinforced concrete (BFRC) is a good alternative to existing synthetic fibers reinforced concrete such as glass and steel fibers. Development of standardized testing procedures and structural specifications utilizing existing and future research findings will pave the way towards an extensive use of bamboo in construction industry.

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“…Minimum amounts of transverse reinforcement are typically required in RC structural elements to ensure adequate crack control and sufficient ductility [12,18]. The use of steel fibers instead of conventional steel stirrups could compensate for the initial cost of steel fibers, eliminate congestion of steel, and reduce the risk of defects and cracks [19][20][21][22]. Previous experimental studies verified the potential of steel fibers to improve the shear behavior of RC deep beams with and without openings [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Concrete Deep Beams Made with Recycled Aggregates and Steel Fibers

et al. 2022

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A bilinear tensile softening law that can describe the post-cracking behavior of concrete made with RCAs and steel fibers was developed based on an inverse analysis of characterization test data. Numerical simulation models were developed for large-scale concrete deep beams. The tensile softening laws along with characterization test results were used as input data in the analysis. The numerical deep beam models were validated through a comparative analysis with published experimental results. A parametric study was conducted to investigate the effect of varying the shear span-to-depth (a/h) ratio, steel fiber volume fraction (vf), and the presence of a web opening on the shear response. Results of the parametric study indicated that the shear strength gain caused by the addition of steel fibers at vf of 1 and 2% was higher in the deep beam models with a lower a/h of 0.8, relative to that of their counterparts with a/h of 1.6. The effect of a/h on the shear strength gain of the solid deep beam models diminished at the higher vf of 3%. The solid deep beam models with a/h of 0.8 exhibited a shear strength gain of 78 to 108% due to the addition of steel fibers, whereas their counterparts with the web opening experienced a reduced shear strength gain of 45 to 70%.

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Cost-Benefit Analysis of Using Recycled Coarse Aggregate In Plain and Fiber Reinforced Concrete

Cited by 3 publications

References 18 publications

Shear Response of Recycled Aggregates Concrete Deep Beams Containing Steel Fibers and Web Openings

Shear Response of Recycled Aggregates Concrete Deep Beams Containing Steel Fibers and Web Openings

Bamboo as a Construction Material: Prospects and Challenges

Numerical Modeling of Concrete Deep Beams Made with Recycled Aggregates and Steel Fibers

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