Recycled aggregate concrete: Particle Packing Method (PPM) of mix design approach

Pradhan, Subhasis; Kumar, Shailendra; Barai, Sudhirkumar V.

doi:10.1016/j.conbuildmat.2017.06.171

Cited by 94 publications

(55 citation statements)

References 105 publications

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“…Basically, in comparison to the conventional mixing method, water is added in two stages in TSMA. However, the detailed description of the mix design methods used in the present study (conventional method and PPM mix design approach) can be found elsewhere …”

Section: Experimental Programmentioning

confidence: 65%

“…Hence, this can be considered as an equivalent volume replacement method, where an equal volume of NCA is replaced by RCA. In addition to this, the concrete mixing was conducted by following the conventional approach, where coarse aggregate, fine aggregate, cement, and water were added in a single stage. Particle packing method of mix design: The proposed PPM mix design approach is based on the idea of void minimization by enhancing the packing density of the aggregate mixture. In this context, the experimental optimization technique is followed, and the proportion of the combination of coarse aggregate and fine aggregate is determined to achieve maximum possible packing density.…”

Section: Experimental Programmentioning

confidence: 98%

“…The presence of adhered mortar layer to the RCA increases the void content at the ITZ of RAC . The proposed particle packing method (PPM) of mix design approach minimizes the void content and improves the mechanical properties of concrete . The positive influence of PPM mix design on the tensile strength of the conventional concrete as well as the RAC motivates the authors to assess its effect on the fracture properties.…”

Section: Research Significancementioning

confidence: 99%

“…The physical and mechanical properties of RCA are inferior to that of NCA as observed from Tables S1 and S2. The detailed description can be found elsewhere …”

Section: Experimental Programmentioning

confidence: 99%

“…The present study aims to understand the influence of PPM of mix design in comparison to the conventional mix design method (IS: 10262 (2009)) on the fracture properties of concrete. Hence, both conventional and PPM mix design methods were employed to prepare NAC as well as RAC.…”

Section: Experimental Programmentioning

confidence: 99%

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Impact of particle packing mix design method on fracture properties of natural and recycled aggregate concrete

Pradhan

Kumar

Barai

2018

Fatigue Fract Eng Mat Struct

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The fracture properties of four types of concrete prepared using natural coarse aggregate and recycled coarse aggregate and conventional and particle packing method (PPM) of mix design approaches are studied. The three‐point bending (TPB) test is performed using three different sizes of single edge notched beam. The fracture energy is calculated from the load‐CMOD curve obtained in the TPB test, and in this process the load‐CMOD curve is curtailed at 2% of the depth of the beam. Based on CTODc and w1 relationship, appropriate softening function is used to estimate the double‐K fracture parameters. The fracture energy and fracture toughness parameters of recycled aggregate concrete (RAC) is inferior to the natural aggregate concrete (NAC). The PPM mix design improves the fracture properties of concrete in comparison to the conventional mix design approach. The fracture properties of PPM mix designed RAC are comparable to that of NAC prepared using conventional method.

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Section: Experimental Programmentioning

confidence: 65%

Section: Experimental Programmentioning

confidence: 98%

Section: Research Significancementioning

confidence: 99%

“…The physical and mechanical properties of RCA are inferior to that of NCA as observed from Tables S1 and S2. The detailed description can be found elsewhere …”

Section: Experimental Programmentioning

confidence: 99%

Section: Experimental Programmentioning

confidence: 99%

See 3 more Smart Citations

Impact of particle packing mix design method on fracture properties of natural and recycled aggregate concrete

Pradhan

Kumar

Barai

2018

Fatigue Fract Eng Mat Struct

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Experimental and numerical analysis of the thermal and mechanical behaviour of steel and recycled aggregate concrete composite elements exposed to fire

et al. 2022

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Using recycled aggregates in the production of concrete has been a viable alternative for sustainable development. Notwithstanding advanced information on this material at room temperature, its behavior when exposed to fire is still incipient. Thus, based on experimental analyses, the objective of this article is to evaluate the behavior of concrete produced with recycled aggregates for thermal insulation of steel elements, as well as to verify the physical and mechanical properties of these mixtures. For this purpose, eight prototypes, one made of steel and the others coated with different types of concrete, conventional and with recycled aggregates, were inserted in a horizontal oven and heated for 2 h. Based on experimental tests, numerical models were proposed and tested using the ABAQUS computational code, with consistent results when coherent thermal properties were adopted. The experimental results show that recycled aggregate concrete (RAC) has great thermal insulation potential and sustainable benefits, considering that the steel elements coated with this type of material, with the exception of those that underwent spalling, presented temperatures close to or below compared with concrete with natural aggregates. In this regard, it is observed that the thermal conductivity of RACs was inferior to conventional concrete, indicating that this material is a promising strategy for thermal insulation of steel structures.

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Effects of aggregate packing optimization and cement paste volume on the properties of natural and recycled aggregate concrete

Jiang

Shu

et al. 2021

Structural Concrete

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This paper investigates the influence of aggregate packing optimization based on a particle packing method (PPM) and cement paste volume (CPV) on the workability and mechanical properties of both natural aggregate concrete (NAC) and recycled aggregate concrete (RAC). The slump, compressive strength, flexural strength and Young's modulus of concrete were first examined, followed with the characterization of macro-pore structure inside RAC by using X-ray computed tomography (CT). The results indicate that the PPM can help to densify the granular skeleton of aggregates in concrete by reducing the void around the aggregates and the cement paste film thickness, and subsequently enhances the mechanical properties of the concrete with a constant CPV. This enhancement is higher for RAC than NAC, particularly for the Young's modulus. The particle packing optimization can also decrease the number of macro pores in RAC, contributing to the enhancement in the mechanical properties of RAC. Moreover, increasing CPV in concrete with a maximum aggregate packing status considerably decreases the mechanical properties of concrete, whereas increases its workability. This is mainly caused by the increased number of macro pores in the cement paste and at the interfaces between RCAs and hardened cement paste.

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Recycled aggregate concrete: Particle Packing Method (PPM) of mix design approach

Cited by 94 publications

References 105 publications

Impact of particle packing mix design method on fracture properties of natural and recycled aggregate concrete

Impact of particle packing mix design method on fracture properties of natural and recycled aggregate concrete

Experimental and numerical analysis of the thermal and mechanical behaviour of steel and recycled aggregate concrete composite elements exposed to fire

Effects of aggregate packing optimization and cement paste volume on the properties of natural and recycled aggregate concrete

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