Potential use of granite waste sourced from rock processing for the application as coarse aggregate in high-performance self-compacting concrete

Ostrowski, Krzysztof; Stefaniuk, Damian; Sadowski, Łukasz; Krzywiński, Kamil; Gicala, Magdalena; Różańska, Magdalena

doi:10.1016/j.conbuildmat.2019.117794

Cited by 68 publications

(37 citation statements)

References 43 publications

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“…To substitute the natural aggregates of concrete with the recycled aggregates made of mining waste and demolished concrete structures, different approaches have been investigated in recent decades [1][2][3]. Efforts have been put into improving the recycling process and technology of recycled aggregates to eliminate the defects of recycled coarse aggregate, including irregular morphology of particles, and rough surface bonded with old mortar leading to greater water absorption [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates

Liang

Zhao

et al. 2020

Materials

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This paper is the outcome of experiments on the shear performance of reinforced concrete beams with approved composite-recycled aggregates. The strength grade of composite-recycled aggregate concrete (CRAC) was between 30 MPa and 60 MPa. The shear span-to-depth ratio varied from 1 to 3. The adaptability of HRB400 rebar, with critical yield strength of 400 MPa, used as stirrups was also verified. As the composite technology overcame the shortcomings of recycled coarse aggregate, CRAC had similar mechanical properties with those of conventional concrete. Details on the shear behaviors of test beams under a four-point loading test are presented. The results indicated that the changes of CRAC strain, stirrup strain, and shear-crack width depended on the failure patterns, which are controlled by the shear-span to depth ratio. The stirrups yield at the failure of reinforced CRAC beams. The shear cracking resistance and the shear capacity of reinforced CRAC beams can be predicted by the statistical equations. Based on the design codes GB50010, ACI318-19, Model Code 2010 and DIN-1045-1-2008 for conventional reinforced concrete beams, the shear strengths provided by CRAC and stirrups are statistical analyzed. The rationality of the design equations is examined by the utilization level of shear strength provided by CRAC. The maximum shear-crack widths are extracted from the test data of reinforced CRAC beams at normal service state. Comparatively, by specifying the lower limit of shear strength provided by the CRAC with various shear-span to depth ratios, China code GB50010 gives a rational method for utilizing CRAC. Under the premise that the design of shear capacity would give considerations to meet the normal serviceability, the factored strength of HRB400 rebar should be 360 MPa for the calculation of shear strength provided by stirrups. The design methods in codes of GB50010, ACI318-19 and Model Code 2010 are conservative for the shear capacity of reinforced CRAC beams.

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Section: Introductionmentioning

confidence: 99%

Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates

Liang

Zhao

et al. 2020

Materials

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“…In order to investigate the effects of the mixture design on concrete, many studies have been conducted. Ostrowski et al [20,21] evaluated the effect of aggregate shape on the mechanical properties of self-compacting high-performance fiber-reinforced concrete (SCHPFRC). They characterized the difference between the regular coarse aggregate and irregular coarse aggregate by comparing the rheological, physical and mechanical properties.…”

Section: Materials and MIX Designmentioning

confidence: 99%

Microstructural Characteristics of Cement-Based Materials Fabricated Using Multi-Mode Fiber Laser

2020

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Cement-based materials are the most prevalent construction materials, and the conventional cutting techniques are still mostly used for fabricating the materials. However, these conventional cutting methods could generate undesirable micro-cracks and remove unintentional structural sections. This experimental study aims to evaluate the effects of the new fabricating method using laser on the microstructural characteristics of the cement-based materials. The experimental variables are laser cutting speed, water to cement ratio and material compositions. In order to compare the microstructure before and after the laser interaction, the microstructure of the cut surface is observed through scanning electron microscopy/energy dispersive X-Ray (SEM/EDX). After the laser interaction, the Material Removed Zone (MRZ) and Heat Affected Zone (HAZ) are observed on the cut surface. In MRZ, it is found that the glassy layer is thickened by an increasing amount of silicate-based materials in cement-based materials. In addition, it concluded that the amount of silicate-based material mixed in the cement-based materials affects the laser cutting quality.

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“…This has spawned a new branch of eco-building materials and the renovation of concrete production equipment dealing with the recycled aggregate. Many recycling and treatment technologies are investigated to improve the morphology feature and surface defects of recycled coarse aggregate [1][2][3][4][5], the design methods for the mix proportion of concrete is modified to concern about the changes of performance due to the natural aggregate partially or fully substituted by recycled aggregate [5][6][7][8][9], and the mixing method of mixture is perfected with pre-soaked procedure to face the issue of high water absorption of recycled aggregates [5,[10][11][12][13]. Generally, these researches provide a foundation for the engineering application of concrete with recycled aggregate.…”

Section: Introductionmentioning

confidence: 99%

Bending Performance of Steel Fiber Reinforced Concrete Beams Based on Composite-Recycled Aggregate and Matched with 500 MPa Rebars

Pei

Fan

et al. 2020

Materials

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To promote the engineering application of recycled aggregate for concrete production with good adaptability and economic efficiency, this paper performed a campaign to investigate the flexural performance of steel fiber reinforced composite-recycled aggregate concrete (SFR-CRAC) beams matched with 500 MPa longitudinal rebars. The composite-recycled aggregate has features of the full use recycled fine aggregate and small particle recycled coarse aggregate, and the continuous grading of coarse aggregate ensured by admixing the large particle natural aggregate about 35% to 45% in mass of total coarse aggregate. The properties of SFR-CRAC have been comprehensively improved by using steel fibers. With a varying volume fraction of steel fiber from 0% to 2.0%, 10 beam specimens were produced. The flexural behaviors of the beams during the complete loading procedure were experimentally studied under a four-point bending test. Of which the concrete strain at mid-span section, the appearance of cracks, the crack distribution and crack width, the mid-span deflection, the tensile strain of longitudinal rebars, and the failure patterns of the beams were measured in detail. Results indicated that the assumption of plane cross-section held true approximately, the 500 MPa longitudinal rebars worked at a high stress level within the limit width of cracks on reinforced SFR-CRAC beams at the normal serviceability, and the typical failure occurred with the yield of 500 MPa longitudinal rebars followed by the crushed SFR-CRAC in compression. The cracking resistance, the flexural capacity, and the flexural ductility of the beams increased with the volume fraction of steel fiber, while the crack width and mid-span deflection obviously decreased. Finally, by linking to those for conventional reinforced concrete beams, formulas are suggested for predicting the cracking moment, crack width, and flexural stiffness at normal serviceability, and the ultimate moment at bearing capacity of reinforced SFR-CRAC beams.

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Potential use of granite waste sourced from rock processing for the application as coarse aggregate in high-performance self-compacting concrete

Cited by 68 publications

References 43 publications

Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates

Shear Performance of Reinforced Concrete Beams Affected by Satisfactory Composite-Recycled Aggregates

Microstructural Characteristics of Cement-Based Materials Fabricated Using Multi-Mode Fiber Laser

Bending Performance of Steel Fiber Reinforced Concrete Beams Based on Composite-Recycled Aggregate and Matched with 500 MPa Rebars

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