TY - JOUR
T1 - Use of recycled concrete aggregate in fly-ash concrete
AU - Limbachiya, Mukesh
AU - Meddah, Mohammed Seddik
AU - Ouchagour, Youssef
N1 - Funding Information:
The authors would like to acknowledge the Day Group Ltd., UK for partial funding of the reported work and supplying recycled concrete aggregate sample for the test programme.
PY - 2012/2
Y1 - 2012/2
N2 - Nowadays, environmentally friendly building is becoming a crucial issue in construction industry. The course towards sustainable concrete involves mainly minimizing the environmental impact of concrete production by substituting virgin mineral materials by recycled ones as well as reducing the global CO 2 emissions. The approach adopted here includes a large substitution of natural coarse aggregates (NA) by recycled concrete aggregates (RCA) obtained from crushed concrete debris, as well as the use of 30% fly ash (FA) as a partial substitute of Portland cement for FA concrete production. Previous study by the authors has revealed the potential of using coarse RCA to produce concrete with a similar 28-day design strength to that obtained when using natural aggregates. This paper discusses the effect of both partial and full replacement of natural coarse aggregates by coarse RCA in a fly ash concrete. Engineering properties and durability performance have been examined on both concrete types (Portland cement and fly ash) for mixes designed with various proportions of the RCA (0%, 30%, 50% and 100%) by mass. The results obtained showed that while embedding high amount of the RCA could lower the resistance to chloride penetration and carbonation of concrete still comparable design strength to that of the control mix might be achieved.
AB - Nowadays, environmentally friendly building is becoming a crucial issue in construction industry. The course towards sustainable concrete involves mainly minimizing the environmental impact of concrete production by substituting virgin mineral materials by recycled ones as well as reducing the global CO 2 emissions. The approach adopted here includes a large substitution of natural coarse aggregates (NA) by recycled concrete aggregates (RCA) obtained from crushed concrete debris, as well as the use of 30% fly ash (FA) as a partial substitute of Portland cement for FA concrete production. Previous study by the authors has revealed the potential of using coarse RCA to produce concrete with a similar 28-day design strength to that obtained when using natural aggregates. This paper discusses the effect of both partial and full replacement of natural coarse aggregates by coarse RCA in a fly ash concrete. Engineering properties and durability performance have been examined on both concrete types (Portland cement and fly ash) for mixes designed with various proportions of the RCA (0%, 30%, 50% and 100%) by mass. The results obtained showed that while embedding high amount of the RCA could lower the resistance to chloride penetration and carbonation of concrete still comparable design strength to that of the control mix might be achieved.
KW - Carbonation
KW - Drying shrinkage
KW - Durability
KW - Fly ash
KW - Mechanical properties
KW - Permeability
KW - Portland cement
KW - Recycled concrete aggregates
KW - Sustainable concrete
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U2 - 10.1016/j.conbuildmat.2011.07.023
DO - 10.1016/j.conbuildmat.2011.07.023
M3 - Article
AN - SCOPUS:80755140545
SN - 0950-0618
VL - 27
SP - 439
EP - 449
JO - Construction and Building Materials
JF - Construction and Building Materials
IS - 1
ER -