Influence of Fly Ash as Cement Replacement on the Properties of Recycled Aggregate Concrete

Kou, Shi Cong; Poon, Chi Sun; Chan, Dwm

doi:10.1061/(asce)0899-1561(2007)19:9(709)

Cited by 399 publications

(137 citation statements)

References 9 publications

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“…The diffusion mechanism of chloride ions occurs in a way comparable to that of carbonation and is mostly dependent on the porosity of the cementitious matrix. For this reason, the literature's findings have revealed that the increasing incorporation of coarse RCA tends to lead to higher chloride ion penetration depths (21,99,104,(120)(121)(122)(123)(124)(125).…”

Section: Chloride Ion Penetrationmentioning

confidence: 99%

Recycled concrete with coarse recycled aggregate. An overview and analysis

González-Fonteboa

Seara-Paz

Brito³

et al. 2018

Mater. construcc.

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ABSTRACT:The construction field has contributed to environmental degradation, producing a high amount of construction and demolition waste (C&D waste) and consuming large volumes of natural resources. In this context, recycled concrete (RC) has been recognised as a means to preserve natural resources and reduce space for waste storage. During the last decades, many researchers have developed works studying different recycled concrete properties.This review focuses on structural RC made with coarse recycled aggregate from concrete waste. The main objective is to provide a state of the art report on RC's properties and an analysis on how to predict them taking into account relevant research works. Moreover, the study tries to collect and update RC findings, proposing equations to define RC's performance, in terms of mechanical strength, modulus of elasticity, stress-strain, creep and shrinkage. RESUMEN:Hormigón reciclado con árido grueso reciclado. Una visión general y análisis. El campo de la construcción ha contribuido a la degradación del medio ambiente, produciendo gran cantidad de residuos de construcción y demolición y consumiendo grandes volúmenes de recursos naturales. En este contexto, el hormigón reciclado se ha presentado como una opción para preservar los recursos naturales y reducir el espacio destinado a vertedero. Así, durante las últimas décadas, muchos investigadores han desarrollado trabajos para estudiar las propiedades del hormigón reciclado.Este artículo se centra en el hormigón estructural fabricado con árido reciclado grueso procedente de residuos de hormigón. El principal objetivo es desarrollar un estado del arte que recoja las principales propiedades del hormigón reciclado y un análisis de cómo calcularlas teniendo en cuenta un gran número de trabajos relevantes en este ámbito. Adicionalmente, el estudio recopila y actualiza el conocimiento sobre estos hormigones, proponiendo ecuaciones que permitan definir sus resistencias mecánicas, módulo de elasticidad, tensión-deformación, fluencia y retracción.

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Section: Chloride Ion Penetrationmentioning

confidence: 99%

Recycled concrete with coarse recycled aggregate. An overview and analysis

González-Fonteboa

Seara-Paz

Brito³

et al. 2018

Mater. construcc.

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“…For the same volume of RAC, the diffusion coefficient of RAC increases with the content of old mortar (Xiao et al 2012;Ying et al 2013a). The application of RCA may increase the chloride penetration rate of RAC (Kou and Poon 2006;Kou et al 2007). The chloride diffusivities of RAC generally increase with an increase of the RCA replacement ratio (R rca ); while for the same R rca , the chloride diffusivities and the distribution of the chloride concentration in the modelled RAC still differ due to the effect of different distributions and arrangements of RCA (Ying et al 2013b).…”

Section: Introductionmentioning

confidence: 99%

“…The durability of concrete is of great concern, especially in high-chloride environments such as coastal areas and where de-icing salt is used in cold regions, and so determining the chloride diffusion characteristics of concrete is required in order to control the durability of concrete structures (Morga and Marano 2015). Additionally, the effects of water to binder ratios and mineral admixtures on RAC chloride diffusion coefficient have already been discussed by Kou and Poon (Kou et al 2007), this investigation will only focus on the physical and geometrical characteristics of RAC.…”

Section: Introductionmentioning

confidence: 99%

On Probability Distribution of Chloride Diffusion Coefficient for Recycled Aggregate Concrete

Ying

Xiao

Meng

2016

Int J Concr Struct Mater

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In predicating the probability distribution of chloride diffusion coefficient of recycled aggregate concrete (D RAC ), the morphological characteristics of three phases, i.e., the old attached mortar, the natural aggregate and the new mortar, should all be taken into account. The present paper attempts to develop a probability density evolution method (PDEM) to achieve this. After verifying the derived PDEM results with experimental results, the effects of old attached mortar to the D RAC are examined in a quantitative manner. It is found that (1) the variation of the attached mortar content is much sensitive to D RAC ; (2) given the probability distribution of the content and chloride diffusion coefficient of old mortar, the probability distribution of D RAC can be analysed based on the PDEM; and (3) the critical chloride diffusion coefficient at a certain assurance rate can be obtained by the PDEM. The analysis results of this investigation will be valuable to the durability design for RAC.

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“…Compressive strength is highly affected by parameters like water-cement ratio of concrete, with the increase in water cement ration the strength goes down and in case of recycled aggregate it also gets influenced by the percentage of replacement of recycled aggregate with quarried aggregate in [21,38,39]. It was reported that reduction in strength is mostly in between 12% to 30% but sometimes till 60 % with 100% replacement of recycled aggregate [7,9,18,19].…”

Section: Compressive Strengthmentioning

confidence: 99%

Behavior of Concrete Utilizing Recycled Aggregate – A Review

Shrimali¹,

Chauhan²,

Gupta³

et al. 2017

IJERA

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Today's modern era is demanding more and more infrastructure development and with the increasing demand of infrastructure, the demand and supply chain of the construction material are getting affected. With increasing pace of development, a great concern is required towards environment as well as natural resources. In this paper, behavior of concrete utilizing recycled aggregate is critically reviewed. Properties of recycled aggregate are discussed at first, followed by the properties of concrete utilizing recycled aggregate. It has been reported that recycled aggregate was found useful if the replacement level is about 30% .This type of concrete has been used in many applications. Recycled aggregate can be seen as future material which will be eco -friendly and will decrease in project cost.

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Influence of Fly Ash as Cement Replacement on the Properties of Recycled Aggregate Concrete

Cited by 399 publications

References 9 publications

Recycled concrete with coarse recycled aggregate. An overview and analysis

Recycled concrete with coarse recycled aggregate. An overview and analysis

On Probability Distribution of Chloride Diffusion Coefficient for Recycled Aggregate Concrete

Behavior of Concrete Utilizing Recycled Aggregate – A Review

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