Durability of recycled aggregate concrete designed with equivalent mortar volume method

Abbas, A.; Fathifazl, Gholamreza; Isgor, O. Burkan; Razaqpur, A. Ghani; Fournier, Benoît; Foo, Simon

doi:10.1016/j.cemconcomp.2009.02.012

Cited by 238 publications

(95 citation statements)

References 8 publications

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“…It was ensured in the EMV concept that the total volume of natural aggregate in recycled concrete aggregate (RCA) concrete is equal to the volume of natural aggregate in the conventional concrete with the same specified properties (Fathifazl 2008;Fathifazl et al 2009;Abbas et al 2009). Thus, the new fresh mortar volume in the RCA concrete (RAC) mix is required to be reduced as much as the residual mortar content (RMC).…”

Section: Modified Equivalent Mortar Volume Methodsmentioning

confidence: 99%

“…An innovative method to solve this problem has been introduced by Fathifazl (2008), Fathifazl et al (2009) and Abbas et al (2009). They undertook an extensive literature review and summarized the mechanical and durability properties of RCA concrete (Fathifazl 2008).…”

Section: Introductionmentioning

confidence: 99%

“…In particular, if RCA concrete is proportioned according to the conventional American Concrete Institute (ACI) method, it would be difficult to enhance its properties such as the modulus of elasticity, drying shrinkage, and freeze-and-thaw resistance (Fathifazl 2008;Fathifazl et al 2009;Abbas et al 2009). …”

Section: Introductionmentioning

confidence: 99%

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Freeze–Thaw Resistance and Drying Shrinkage of Recycled Aggregate Concrete Proportioned by the Modified Equivalent Mortar Volume Method

Yang

Lee²

2017

Int J Concr Struct Mater

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To evaluate the effect of the mix proportioning method on drying shrinkage and freeze-and-thaw resistance of recycled concrete aggregate (RCA) concrete, two series of concrete mixes were made using the modified equivalent mortar volume (EMV) method and the conventional ACI method. In this study, different sources of RCAs were manufactured from on-site plants on air bases and at a commercial recycling plant. Keeping the total mortar at the same level, concrete mixes were proportioned by the modified EMV method, using different scale factors: S = 1 (with RCA substitution of 23%), S = 2 (with RCA substitution of 47%), and S = 3 (with RCA substitution of 73%). It was assumed that the residual mortar volume in the RCA concrete was represented in the sum of the volume of mortar and the volume of aggregate, in variance to the scale factors. Test results showed that the modified EMV method for all the mixes yielded the drying shrinkage property of the RCA concrete comparable to that of the companion concrete with natural coarse aggregate. On the other hand, it was observed in the freeze-and-thaw test that the modified EMV method could be marginally applied to the limited condition with S = 2.

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Section: Modified Equivalent Mortar Volume Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Freeze–Thaw Resistance and Drying Shrinkage of Recycled Aggregate Concrete Proportioned by the Modified Equivalent Mortar Volume Method

Yang

Lee²

2017

Int J Concr Struct Mater

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“…However, the effect of CMCs on concrete durability is still ambiguous. Moreover, previous researches [24][25][26][27][28] have reported that the use of RA up to 30% showed slight reduction in mechanical and durability properties of concrete. Researches carried out on RGS concrete mixes have showed that the use of RGS up to 15% indicated comparable mechanical performances [29].…”

Section: Introductionmentioning

confidence: 99%

“…Existing literature [26,28,[32][33] on the use of CMC reduced carbonation resistance of concrete. Gönen and Yazıcıoğlu [24] investigated ternary blend (PC+FA+SF) concrete had lower carbonation depth which could be attributed to SF addition reduced concrete porosity.…”

Section: Introductionmentioning

confidence: 99%

Portland-composite and composite cement concretes made with coarse recycled and recycled glass sand aggregates: Engineering and durability properties

Bostancı

Limbachiya

Kew

2016

Construction and Building Materials

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Sustainable development approach demands the use of environmentally friendly materials. One possible way to encourage sustainable approach is via use of Portland cement (PC) replacement through use of permitted cement constituents in conformity with BS EN 197-1, to lower carbon footprint, and use of recycled aggregates as permitted within BS 8500, to encourage sustainability. Thus, this research study aimed to produce low carbon and sustainable concrete. For this aim, engineering and durability properties of equal 28-day design strength (40 and 50 N/mm 2 ) concretes made with Portland-composite and composite cements, CEM II/B-M and CEM V/A respectively, and partially substituted coarse recycled (RA) and washed recycled glass sand (RGS), 25% and 15% respectively, aggregates was investigated. The loss of workability was found to be larger for particularly CEM V/A and recyled aggregate concrete (RAC) mixes. Studies of hardened concrete properties, comprising bulk engineering properties (compressive cube and cylinder strength, flexural strength, drying shrinkage) and durability (initial surface absorption) showed enhanced performance for CEM II/B-M and CEM V/A mixes of equivalent strength natural aggregate concrete mixes (NAC), except resistance to carbonation. However, the use of CEM II/B-M and CEM V cements in RAC mixes slightly reduced the engineering and durability properties compared to corresponding NAC mixes.Keywords: Carbonation, initial surface absorption, drying shrinkage, fly ash, ground granulated blast-furnace slag, silica fume, recycled glass sand, coarse recycled aggregate Bullet points:Use of CEM II/B-M and CEM V/A cements and coarse recycled aggregates and recycled glass sand in concrete production increased the required superplasticizer demand to achieve the similar consistency.CEM II/B-M cement recycled aggregate concrete mixes indicated either similar or slightly better loss of workability over time compared to corresponding CEM I cement RAC mix.The partial substitution of natural coarse and fine aggregates by 25% coarse recycled and 15% recycled glass sand aggregates reduced the compressive cube strength of concrete approximately by 10%.Recycled aggregates concrete mixes showed dramatically lower compressive cylinder strength results compared to conventional natural aggregate concrete mixes.Drying shrinkage results showed that the contribution of pozzolanic reactions for Portlandslag and composites cement concretes takes place after 14 days.CEM II/B-M cement mixes indicated lower ISAT-10 values as the design strength class increased.Carbonation penetration results showed improvement as the design strength increased for the same cement type concrete mixes.

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Effect of old attached mortar on the creep of recycled aggregate concrete

Fan

Xiao

Tam

2014

Structural Concrete

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This paper first presents an experimental study on the shrinkage and creep behaviour of recycled aggregate concrete (RAC) with different recycled coarse aggregate (RCA) replacement percentages (i.e. 0 %, 33 %, 66 %, 100 %). The experimental results reveal that increasing the RCA replacement percentage can increase the shrinkage and creep of RAC. A numerical method for creep behaviour with old adhering mortar is also proposed by analysing the influence mechanism of creep and the volume content of old adhering mortar on the creep of RAC. It is found that the RAC creep is significantly influenced by old adhering mortar properties and its volume content. Finally, a numerical model of RAC creep is established by considering the influence of mechanical properties and the creep behaviour of old adhering mortar. It is proved that this model can calculate the creep of RAC.

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Durability of recycled aggregate concrete designed with equivalent mortar volume method

Cited by 238 publications

References 8 publications

Freeze–Thaw Resistance and Drying Shrinkage of Recycled Aggregate Concrete Proportioned by the Modified Equivalent Mortar Volume Method

Freeze–Thaw Resistance and Drying Shrinkage of Recycled Aggregate Concrete Proportioned by the Modified Equivalent Mortar Volume Method

Portland-composite and composite cement concretes made with coarse recycled and recycled glass sand aggregates: Engineering and durability properties

Effect of old attached mortar on the creep of recycled aggregate concrete

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