Properties of concrete blocks prepared with low grade recycled aggregates

Poon, Chi Sun; Kou, Shi Cong; Wan, Huiwen; Etxeberria, Miren

doi:10.1016/j.wasman.2009.02.018

Cited by 109 publications

(58 citation statements)

References 9 publications

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“…The results suggest that the recycled aggregates were porous about 7 (700%) times more than natural aggregates. Our results are generally in agreement even relatively higher with previous studies conducted in Hong Kong where it was reported that water absorption for recycled coarse aggregates range from 4.2 to 7.6% (Poon et al, 2002;Poon et al, 2009). This could be caused by the presence of the cement paste/mortar attached to the crushed recycled aggregates.…”

Section: Aggregates Qualitysupporting

confidence: 93%

“…The rest of the recycled aggregates, the results showed that the TFV is out of range even though, the graphs of percentage of material passing at 2.36 mm sieve size versus load applied gave high value to the correlation coefficient (R 2 ) which were greater than 93%. Unlike Poon et al (2002) and Poon et al (2009) who indicated that the TFV of recycled aggregates range from 72 -145.1 kN, in this study, the TFV obtained from recycled aggregates from construction waste, and the rest of the recycled aggregates was out of range. The TFV results indicate that the recycled aggregates from demolition (i.e.…”

Section: Aggregates Qualitycontrasting

confidence: 86%

“…Debied and Kenai (2008) investigated the possibility to reuse coarse and fine crushed bricks as aggregate in concrete production, and found that the level of substitution should be limited to 25% and 50% for coarse and fine crushed brick aggregates respectively, in order to obtain minimum of compressive strength of 22 MPa. Poon et al's (2009) study was based on recycling and assessing the low grade aggregates obtained from a construction waste sorting facility for use in the production of concrete blocks. It was reported that the low grade recycled aggregates obtained from the construction waste sorting facility had the potential to be used as aggregates for making non-structural pre-cast concrete blocks.…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that the low grade recycled aggregates obtained from the construction waste sorting facility had the potential to be used as aggregates for making non-structural pre-cast concrete blocks. In addition, the optimal percentage of recycled fine aggregates (RFA) that can be used to replace natural fine aggregates by 50% (Poon et al, 2009). These studies show that much effort has been made to recycle the C&D waste into building material particularly concrete products in different places especially developed countries.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Concrete block production from construction and demolition waste in Tanzania

Sabai

Cox

Mato

et al. 2013

Resources, Conservation and Recycling

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Section: Aggregates Qualitysupporting

confidence: 93%

Section: Aggregates Qualitycontrasting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Concrete block production from construction and demolition waste in Tanzania

Sabai

Cox

Mato

et al. 2013

Resources, Conservation and Recycling

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show abstract

“…Studies such as that of Etxeberria et al (14) and Kou (25) focus on the properties of recycled concrete (RC) for use as structural concrete, and report satisfactory results provided that less than 25% of the coarse fraction is replaced. Other studies have demonstrated the feasibility of using RA in the production of nonstructural concrete (13,15,26) such as concrete blocks for use in partition walls (11,27), paving blocks (8)(9)(10)(28)(29)(30), paving flags (8, 31) and concrete kerbs and floor blocks (10). These studies have shown that the quality of the pre-cast elements depends on the extent to which NA is replaced by RA, with values that ranged from 25-50% for paving blocks, 30-65% in the case of paving flags, 50% for kerbs and partition wall concrete blocks, or even 100% in the manufacture of floor blocks.…”

Section: Introductionmentioning

confidence: 99%

Study of potential advantages of pre-soaking on the properties of pre-cast concrete made with recycled coarse aggregate

et al. 2016

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Recycled aggregate (RA) from construction and demolition waste is traditionally used for the manufacture of concrete for different applications. Due primarily to high water content required by RA, the quality of the concrete is determined by the amount of replacement RA. The aim of this study is to determine if RA pre-soaking enhances the properties of pre-cast concrete for street furniture, with low mechanical and structural requirements, in which 100% of the coarse fraction is replaced. The results of physical and mechanical tests performed on concrete specimens in which the RA was pre-soaked using five different methods applied are compared with a reference concrete sample and a concrete sample made with non-pre-soaked RA. The results show that non-pre-soaked RA offers improved physical-mechanical properties for pre-cast concrete, except for the workability; problems arising from poorer workability could be improved with the use of plasticizers, which can be easily included in the production process. RESUMEN: Estudio de las ventajas potenciales del premojado en las propiedades del hormigón prefabricado con árido reciclado grueso.El árido reciclado (AR) procedente de residuos de construcción y demolición se utiliza tradicionalmente en la elaboración de hormigón para diferentes aplicaciones. Debido principalmente al mayor contenido en agua requerido por el AR, la calidad del hormigón está determinada por la cantidad de AR reemplazado. El objetivo de este estudio es determinar si el AR premojado mejora las propiedades del hormigón prefabricado para mobiliario urbano, con bajas exigencias mecánicas y estructurales, en el que se sustituye el 100% de la fracción gruesa. Los resultados de los ensayos físicos y mecánicos realizados sobre muestras de hormigón en las cuales el AR se ha premojado usando cinco métodos diferentes se han comparado con una muestra de hormigón de referencia y una muestra de hormigón fabricada con AR no premojado. Los resultados muestran que el AR no premojado proporciona propiedades físico-mecánicas mejoradas en el hormigón prefabricado, a excepción de la trabajabilidad; los problemas derivados de una deficiente trabajabilidad pueden ser fácilmente corregidos con la incorporación de plastificantes en el proceso de fabricación.

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Effects of replacement ratio and particle size distribution of recycled coarse aggregate on mechanical properties of concrete designed using equivalent mortar volume method

Wang

Liu

Wang

2022

Structural Concrete

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The equivalent mortar volume (EMV) mixing method has been proposed to prepare recycled aggregate concrete (RAC) with comparable mechanical properties to those of reference natural aggregate concrete (NAC). Previous studies primarily focused on the mechanical properties of EMV concrete with a single replacement ratio of recycled coarse aggregate (RCA). This paper investigates how the mechanical properties of EMV concrete vary with the replacement ratios and particle size distributions of RCA. Five different RCA replacement ratios and two RCA particle size distributions were assessed. A material demand coefficient was principally proposed to quantify the contribution of the EMV mixing method to reduce the environmental impact; the maximum RCA replacement ratio was suggested to obtain sufficient workability of EMV concrete using an effective sand ratio; a drying shrinkage model was theoretically proposed for EMV concrete accounting for the drying shrinkage of residual mortar. The obtained results indicated that the compressive strength and elastic modulus properties of EMV concrete decreased with increasing RCA replacement ratios; using the effective sand ratio of EMV concrete, comparable mechanical properties to those of reference NAC could be obtained for EMV concrete; the proposed shrinkage model was consistent with the available experimental data.

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Properties of concrete blocks prepared with low grade recycled aggregates

Cited by 109 publications

References 9 publications

Concrete block production from construction and demolition waste in Tanzania

Concrete block production from construction and demolition waste in Tanzania

Study of potential advantages of pre-soaking on the properties of pre-cast concrete made with recycled coarse aggregate

Effects of replacement ratio and particle size distribution of recycled coarse aggregate on mechanical properties of concrete designed using equivalent mortar volume method

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