Influence of mixed recycled aggregate on the physical – mechanical properties of recycled concrete

Medina, César; Zhu, Wenzhong; Howind, Torsten; Rojas, M.I. Sánchez de; Frías, Moisés

doi:10.1016/j.jclepro.2014.01.002

Cited by 247 publications

(130 citation statements)

References 43 publications

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“…Concretes made with 100% of RMA from series 3 showed a significantly higher value than those of conventional concretes from series 1 and 2. According to Langford and Broomfield [36], the mixes from series 3, produced with type III cement, showed low and moderate corrosion risk, respectively.These results, as other researchers have already confirmed [11], endorse the fact that it is in reality the cement type that is the major influence on electrical resistivity, playing an active part above that of the replacement ratio of RMA or the water type used. …”

supporting

confidence: 84%

“…Both types of cement were selected according to the recommendations laid down by international standards and the appropriate behaviour in seawater environments as described by several authors [11,14,16].…”

Section: Cementmentioning

confidence: 99%

“…Up to date, certain studies have analysed the possibility of using RMA for higher grade applications than those of non-structural concrete, such as medium-strength concrete [7] [10, 11,12] and high-performance concrete [7,8] [10, 13]. The consistency of the concretes produced with RMA may be affected by the high absorption capacity of the mixed recycled aggregates, which as known is much more than that of natural aggregates [5] [8].…”

Section: List Of Figuresmentioning

confidence: 99%

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Properties of Plain Concrete Produced Employing Recycled Aggregates and Sea Water

Etxeberria

Gonzalez-Corominas

2017

Int J Civ Eng

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Highlights:The use of Recycled Mixed Aggregates (RMA) leads to a reduction of landfills growthThe use of seawater represents another advance in sustainability by reducing fresh water consumption Analysis of the possibility of using RMA and seawater in the production of concrete to be used in port sitesThe use of seawater in concretes with type III cement produced a denser cement matrix, which suffered low decrease by RMA addition. AbstractThe generation of construction and demolition waste (C&DW) is a noteworthy environmental and economic concern. The development of new applications in which Recycled Mixed Aggregates (RMA) can be used will lead to a reduction of landfills growth. Moreover, the use of seawater shall represent another advance in sustainability due to the consequent reduction of fresh water consumption, which can be a limited resource in certain areas. Although seawater is not generally recommended for concrete production, especially in reinforced concretes, seawater could be a viable replacement for fresh water in the production of plain concretes. This study intends to analyse the possibility of using RMA and seawater in the production of concrete to be used in port sites. This study is based on 3 different parameters: cement class, water source and RMA content. The results highlighted the beneficial effects of using type III cement, especially with regard to durability properties. The concretes produced employing RMA and type III cement achieved lower value of sorptivity coefficient and higher values of ultrasonic pulse velocity (UPV), chloride ion penetration resistance and electrical resistivity than those produced with natural aggregates and type I cement. Moreover the use of seawater in concretes with type III cement not only produced higher density and lower absorption capacity but also higher mechanical properties by creating a denser cement matrix, which proved to suffer low decrease by RMA addition.Key words: mixed recycled aggregate, sea water, blast furnace cement, recycled concrete, properties INTRODUCTIONConstruction and demolition waste (C&DW) generation is a major economic and environmental concern for European Union countries, as it represents the heaviest and most voluminous waste streams [1]. C&DW still registers low recycling ratios, especially in Southern European countries. In these countries C&DW is commonly comprised of several different materials such as concrete, old raw aggregates, ceramic bricks and gypsum. Following their treatment in a recycling plant the recycled aggregates sourced from this type of C&DW are designated as recycled mixed aggregate (RMA) [2][3][4]. This mixed aggregate, while being comprised of a much greater percentage of ceramic material and other impurities has comparatively only a small percentage of concrete and raw aggregates. Currently most of RMA used in the construction industry are employed in low-strength required applications, such as road sub-base layers.The use of RMA in concrete production has mainly been studied for non-structural eleme...

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supporting

confidence: 84%

Section: Cementmentioning

confidence: 99%

Section: List Of Figuresmentioning

confidence: 99%

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Properties of Plain Concrete Produced Employing Recycled Aggregates and Sea Water

Etxeberria

Gonzalez-Corominas

2017

Int J Civ Eng

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“…The maximum water absorption obtained after 72 ± 2 h immersion was 7.11% for the control mix and the lowest was 6.29%, belonging to a mix with 50% RGA content. It is generally believed that good quality concrete has water absorption of less than 10% [50]. All the SCM mixes produced in this research met the requirements and can be regard as a good quality concrete.…”

Section: Water Absorptionmentioning

confidence: 56%

“…It is generally believed that good quality concrete has water absorption of less than 10% [50]. All the SCM mixes produced in this research met the requirements and can be regard as a good quality concrete.…”

Section: Water Absorptionmentioning

confidence: 56%

Experimental Study of Self-Compacting Mortar Incorporating Recycled Glass Aggregate

Tuaum

Shitote

Oyawa³

2018

Buildings

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Abstract:This experimental research is focused on the development of self-compacting mortar incorporating recycled glass aggregate (SCM-RGA) as partial substitution of fine aggregate (wt 0%, 10%, 20%, 30%, 40% and 50%). The fresh and hardened mechanical properties as well as durability of SCM-RGA mixes were investigated. Limestone powder (LP) was used as filler that constitutes 20% of the powder volume to reduce the amount of cement. The SCM-RGA mixtures were designed based on Japanese mix design method. The experimental test results showed that the slump flow of SCM-RGA mixes decreased and V-funnel flow time increased when the content of recycled glass aggregate (RGA) increased. The bulk density, compressive strength, flexural strength, water absorption and sorptivity of SCM-RGA mixes were decreased as RGA content increased. Moreover, the accelerated mortar bar test results showed that the expansion due to alkali-silica reaction (ASR) of SCM-RGA mixes increased as the content of RGA increased although the expansion of all mixes were within acceptable limit and potentially innocuous. In conclusion, up to 30% of RGA can be successfully integrated in SCM mixes that offers comparable strength performance, sorptivity enhancement and without long term detrimental ASR effect, and thus, contributes towards sustainable solid waste management, conservation of natural resources and environmental protection.

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Mechanical and durability properties of steel fiber‐reinforced concrete containing coarse recycled concrete aggregate

Kaplan

Bayraktar

Gholampour

et al. 2021

Structural Concrete

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The focus of this study is to investigate the effect of using coarse recycled concrete aggregates (RCAs) as an alternative material to natural coarse aggregate on the fresh, mechanical and durability behavior of concrete reinforced with steel fiber. Eighteen unique concrete mixes with RCA content of 0%, 50%, and 100% and steel fiber content of 0%, 1%, and 2% were prepared, and tests were performed to study slump, density, compressive and splitting tensile strengths, flexural behavior, surface hardness, surface abrasion resistance, water absorption, and sorptivity of each mix. It is shown that concrete containing RCA has a lower unit weight, compressive, splitting tensile and flexural strength, flexural toughness, surface hardness, and abrasion resistance, and a higher water absorption and sorptivity in comparison with conventional concrete. An increased compressive, splitting tensile and flexural strength, flexural toughness, surface hardness, and abrasion resistance, and a decreased water absorption and sorptivity of concrete with an increased steel fiber content from 1% to 2% is less significant compared to those from 0% to 1%. The results also show that, at RCA content of 50%, incorporating 1% steel fiber develops a concrete mix with similar or even better properties compared to unreinforced conventional concrete. At 100% RCA content, incorporating 2% steel fiber develops a concrete mix with similar properties to unreinforced conventional concrete having water to cement ratio of 0.3, but inferior properties to unreinforced conventional concrete having water to cement ratio of 0.5. These findings indicate that recycled aggregate concrete with similar or even better properties compared to concrete with natural aggregate can be developed through properly designing mixes, providing a great avenue toward the production of green construction material for structural applications.

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Influence of mixed recycled aggregate on the physical – mechanical properties of recycled concrete

Cited by 247 publications

References 43 publications

Properties of Plain Concrete Produced Employing Recycled Aggregates and Sea Water

Properties of Plain Concrete Produced Employing Recycled Aggregates and Sea Water

Experimental Study of Self-Compacting Mortar Incorporating Recycled Glass Aggregate

Mechanical and durability properties of steel fiber‐reinforced concrete containing coarse recycled concrete aggregate

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