Recycled Aggregate Concrete as Material for Reinforced Concrete Structures

Kosior‐Kazberuk, Marta; Grzywa, Mateusz

doi:10.5755/j01.sace.7.2.7135

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…Therefore, various fibres are used to reinforce recycled aggregate concrete to improve its mechanical properties [32][33][34][35]. Among many fibres, steel fibre is one of the most effective materials to enhance the tensile strength of recycled aggregate concrete [36][37][38]. Most studies have investigated the improvement in the mechanical properties of recycled aggregate concrete containing steel fibres by measuring the compressive, tensile and flexural strengths.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres

et al. 2021

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In this study, the impact of steel fibres and Silica Fume (SF) on the mechanical properties of recycled aggregate concretes made of two different types of Recycled Coarse Aggregates (RCA) sourced from both low- and high-strength concretes were evaluated through conducting 60 compressive strength tests. The RCAs were used as replacement levels of 50% and 100% of Natural Coarse Aggregates (NCA). Hook-end steel fibres and SF were also used in the mixtures at the optimised replacement levels of 1% and 8%, respectively. The results showed that the addition of both types of RCA adversely affected the compressive strength of concrete. However, the incorporation of SF led to compressive strength development in both types of concretes. The most significant improvement in terms of comparable concrete strength and peak strain with ordinary concrete at 28 days was observed in the case of using a combination of steel fibres and SF in both recycled aggregate concretes, especially with RCA sourced from high strength concrete. Although using SF slightly increased the elastic modulus of both recycled aggregate concretes, a substantial improvement in strength was observed due to the reinforcement with steel fibre and the coexistence of steel fibre and SF. Moreover, existing models to predict the elastic modulus of both non-fibrous and fibrous concretes are found to underestimate the elastic modulus values. The incorporation of SF changed the compressive stress-strain curves for both types of RCA. The addition of steel fibre and SF remarkably improved the post-peak ductility of recycled aggregates concretes of both types, with the most significant improvement observed in the case of RCA sourced from a low-strength parent concrete. The existing model to estimate the compressive stress-strain curve for steel fibre-reinforced concrete with natural aggregates was found to reasonably predict the compressive stress-strain behaviour for steel fibres-reinforced concrete with recycled aggregate.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres

et al. 2021

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“…Authors used various doses of recycled fine aggregates and based on the research outcome they concluded that the use of recycled fine aggregates in structural concrete has promising effect on the strength of the concrete. Authors in [12] used 100% replacement of course aggregates with coarse aggregates from demolished concrete to study the load-strain behavior of reinforced concrete beams along with the influence of steel fiber reinforcements. Based on the experimental results they observed that addition of steel fibers and recycled aggregates significantly increased the mechanical strength and fracture process in comparison to the control concrete.…”

Section: Wwwetasrcom Oad Et Al: Flexural Stress-strain Behavior Of Rc Beams Made With Partial Replacement Of Coarse …mentioning

confidence: 99%

Flexural Stress-Strain Behavior of RC Beams made with Partial Replacement of Coarse Aggregates with Coarse Aggregates from Old Concrete: Part-2: Rich Mix

Oad

Buller

Memon

et al. 2018

Eng. Technol. Appl. Sci. Res.

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Crowded city centers pose serious problems of infrastructure and associated facilities. Construction industry is obliged to opt for vertical construction in place of short height structures in order to meet with the needs. This leads to the generation of huge quantities of demolishing waste whose management is a serious issue. One of its best uses is its utilization in new concrete. Concrete is widely used in construction industry. Normally 1:2:4 mix is used, but the use of rich mix is also common in columns and elsewhere. Therefore, this research work focuses on evaluating the flexural stress-strain behavior of rich concrete mix beams made with 50% replacement of natural coarse aggregates with coarse aggregates from old concrete. A total of 12 reinforced concrete beams 1:1.5:3 ratio mix and 0.54 w/c ratio are prepared in two batches in 0.9mx0.15mx0.15m beams. In the first batch, natural coarse aggregates are replaced in 50% with coarse aggregates from demolished concrete and the second batch contains beams made with all-natural coarse aggregates. To reinforce the beams, 2#4 deformed bars are used in compression and tension zone along with #3 stirrups at 15cm c/c all along the length of the beam. In each batch, half of the beams are cured for 7 days and half for 28 days. After curing, all beams are tested for load, deflection, and strain in a universal load testing machine. All parameters are recorded at regular intervals and cracking and failure patterns are monitored. From obtained results, it is analyzed that the beams presented 11.68% reduction in flexural capacity. Cracking pattern and failure mode of the beams is similar to those of the control specimen.

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“…Several studies have been carried out on reusing by-products and residual wastes as recycled materials. Among them, are the utilization of wastes as additive or substitute in concrete and cement mixtures [8][9][10][11][12]; as soil stabilization in geotechnical soil work; and in various stages of road construction [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Despite this drawback, this method is able to reduce the space required for the disposal of CRT glass and thus contribute positively to environmental management. Kosior-Kazberuk and Grzywa [10] have discovered a method for producing sustainable concrete beam structures which utilize 100% recycled coarse aggregates. Ismail and Al-Hashmi [12] employed glass residues obtained from glass bottles and window glass with an optimum mix of 20% replacement to produce concrete with maximum compressive strength and bending, relative to the control concrete.…”

Section: Introductionmentioning

confidence: 99%

Performance Characteristics of Road-base Containing Mixed Steel Slag and Cathode Ray Tube Glass

Mohamad¹,

Jamil²,

Yusoff³

et al. 2021

cea

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One way to promote sustainability in construction is through the preservation of natural resources and utilization of recycled wastes. This paper describes a laboratory study on the use of steel slag and cathode ray tube (CRT) glass for road base pavement layer. Measurements of the physical and mechanical characteristics of each sample are taken to evaluate the effectiveness of using these materials in road base pavements. The laboratory evaluation comprised of Los Angeles abrasion value (LAAV) test, California bearing ratio (CBR) test and performance characterization; the unconfined compression strength (UCS) and indirect tensile strength (ITS) tests were also performed. The values for LAAV are satisfactory, indicating that the steel slag and granite mixtures have adequate resistance and abrasion for use as road base pavement aggregates. The higher percentages of steel slag in the mixture produced higher CBR values for both the soaked and unsoaked mixtures. Test results also show that the mixtures containing up to 70% steel slag and 15% CRT glass meet the standards requirements. Results of the UCS and ITS tests for performance characterization showed that the performance of the sample mixture was enhanced significantly upon incorporating a higher percentage of steel slag in the mixture. The lab test results showed that the mixture composing of granite, steel slag and CRT glass is a suitable alternative made from recyclable materials, for use in road base pavement layer.

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Recycled Aggregate Concrete as Material for Reinforced Concrete Structures

Cited by 9 publications

References 26 publications

Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres

Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres

Flexural Stress-Strain Behavior of RC Beams made with Partial Replacement of Coarse Aggregates with Coarse Aggregates from Old Concrete: Part-2: Rich Mix

Performance Characteristics of Road-base Containing Mixed Steel Slag and Cathode Ray Tube Glass

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