Performance evaluation of structural concrete using controlled quality coarse and fine recycled concrete aggregate

Lotfy, Abdurrahmaan; Al-Fayez, Mahmoud

doi:10.1016/j.cemconcomp.2015.02.009

Cited by 110 publications

(27 citation statements)

References 22 publications

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“…Yildirim et al 10) investigated the effect of internal curing provided by FRCA on the freezethaw resistance of a 0.50.7 w/c concrete. Lotfi and Al-Fayez 11) reported that the freezethaw resistance of concrete containing CRCA and FRCA at replacement rates of 20% natural aggregate is as high as that of the reference non-recycled concrete. Lotfi et al 12) investigated low-strength and moderate-strength concrete that both contained an air-entraining agent (AEA).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the freeze–thaw resistance of concrete incorporating carbonated coarse recycled concrete aggregates

Wang

et al. 2017

J. Ceram. Soc. Japan

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This study aims to characterise the freezethaw resistance of concrete incorporating carbonated coarse recycled concrete aggregate (C-CRCA) at partial or full replacement rates of coarse natural aggregate (CNA). Experimental work is conducted for C-CRCA with varying CO 2 curing time (0 day, 3 day, 7 day) and C-CRCA weight replacement percentages (0, 20, 50, 100%) for concrete production. Weight loss, relative dynamic modulus of elasticity (RDME) and residual compressive strength were monitored after 300 freezethaw cycles. Pore size distribution and crack volume variation were also measured via nuclear magnetic resonance to investigate changes in the microstructure of the concrete interior. The compressive strength of concrete decreases with the replacement percentage of CNA by the C-CRCA. The internal freezethaw resistance of concrete with C-CRCA was higher or equal to those of concrete with CRCA and CNA. The total replacement of CNA by C-CRCA led to the highest RDME, and 50% replacement of CNA by C-CRCA led to the highest residual compressive strengths after the freezethaw cycles. However, the weight loss was more severe with the increasing replacement of CNA by C-CRCA. Increasing CO 2 curing time improved the frost resistance of C-CRCA concrete. The analyses of concrete mesostructure based on pore size distribution and crack volume variation agreed with the results of RDME and the compressive strength of concrete.

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Section: Introductionmentioning

confidence: 99%

Assessment of the freeze–thaw resistance of concrete incorporating carbonated coarse recycled concrete aggregates

Wang

et al. 2017

J. Ceram. Soc. Japan

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“…This finding was consistent to that of Kwan et al (2012) [2] who reported that RCA influences concrete design and durability. This trend was not observed by Lotfy and Al-Fayez, (2015) [13] when they used high-quality RCA produced on a commercial scale. Their RCA performed equally to virgin aggregates up to 30% coarse replacement and 20% granular replacement.…”

Section: Compressive Strengthmentioning

confidence: 63%

Engineering Behavior of Concrete with Recycled Aggregate

et al. 2016

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Abstract. Concrete is extensively used as construction materials in Malaysia. Concrete contributes suitable feature for construction industry for instance durability, adequate compressive strength, fire resistance, availability and is economic as compared to other construction materials. Depletion of natural resources and disposal of construction and demolition waste remarkably claim environmental threat. In this paper, the engineering behavior, durability, and concrete microstructure of recycled concrete aggregates (RCA) on short-term concrete properties were investigated. The studied concrete at design mix proportion of 1:0.55:2.14:2.61 (weight of cement :coarse aggregates :sand :water) used to obtain medium-high compressive strength with 20%, 50%, and 100% of RCA. Results show that for the same water/cement ratio, RCA replacement up to 50% still achieved the targeted compressive strength of 25 MPa at 28 curing days. Addition, at similar RCA replacement, the highest carbonation depth value was found at 1.03 mm which could be attributed to the pozzolanic reaction, thus led to lower carbonation resistance. Scanning electron microscopy microstructure shows that the RCA surface was porous and covered with loose particles. Moreover, the interfacial transition zone was composed of numerous small pores, micro cracks, and fissures that surround the mortar matrix. On the basis of the obtained results, recommendable mineral admixtures of RCA are necessary to enhance the quality of concrete construction.

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“…En la Figura 3 se observa que la mezcla con 100% de reemplazo de arena por AFR presentó una resistencia a la compresión promedio de 47,1 MPa a los 28 días de curado, resistencia mayor en comparación con la de la mezcla patrón (43,9 MPa). Este aumento de 7,3% en la resistencia se debe principalmente a que los finos provenientes de escombros forman una matriz con mayor adherencia debido a la rehidratación del cemento contenido en este, lo cual proporciona sitios de nucleación para la formación de nuevos productos de hidratación, lo que sugiere que la adición de finos de escombros reciclados contribuye al (Florea, 2013) (Lotfy y Al-Fayez, 2015;Ledesma, E.F. et al, 2014;Jiménez, J.R. et al, 2013).…”

Section: Resistencia a La Compresión De Los Morterosunclassified

Evaluación de las propiedades mecánicas de paneles de ferrocemento con agregado fino reciclado

et al. 2015

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Este trabajo describe la obtención de paneles de ferrocemento con la incorporación de agregado fino reciclado (AFR) obtenidos a partir de la trituración de escombros de concreto. Se partió de la obtención de un mortero referencia que cumpliera con la resistencia mínima a la compresión requerida para esta aplicación (25 MPa a los 28 días de curado) y asentamiento máximo de 6 cm. Se estudió el efecto sobre la resistencia a la compresión de este mortero de referencia, de la incorporación de AFR en niveles de 25%, 50%, 75% y 100%. Posteriormente y con base en resultados óptimos se elaboraron paneles de ferrocemento utilizando barras de acero, malla hexagonal y malla zaranda (ZAG). Los resultados obtenidos revelan la posibilidad de sustituir totalmente la arena natural por AFR en la fabricación de paneles de ferrocemento con resistencias a la flexión de hasta 34,16 MPa y morteros con resistencias a la compresión superiores a 7,3% a los basados en un 100% de arena natural.

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Performance evaluation of structural concrete using controlled quality coarse and fine recycled concrete aggregate

Cited by 110 publications

References 22 publications

Assessment of the freeze–thaw resistance of concrete incorporating carbonated coarse recycled concrete aggregates

Assessment of the freeze–thaw resistance of concrete incorporating carbonated coarse recycled concrete aggregates

Engineering Behavior of Concrete with Recycled Aggregate

Evaluación de las propiedades mecánicas de paneles de ferrocemento con agregado fino reciclado

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