TY - GEN
T1 - Durability and environmental impact of concrete combining various waste and recycled materials
AU - Henry, Michael
AU - Pardo, German
AU - Nishimura, Tsugio
AU - Kato, Yoshitaka
PY - 2010
Y1 - 2010
N2 - Utilization of waste and recycled materials in concrete is necessary to rcducc environmental impact but may have an adverse affect on mechanical properties. This paper investigated the effect of various combinations of fly ash, blast furnace slag, and low-grade recycled aggregates in concrete at three different water-binder ratios on mechanical and environmental performance. The balance between durability and environmental impact for a given strength level similar to normal-use concrete was also examined using analytic hierarchy process. Results showed that increasing the water-binder ratio and volume of recycled aggregate reduced compressive strength and increased air permeability and drying shrinkage. However, compared to normal-use concrete similar or better performance could be achieved, which was attributed to improvement of low-grade recycled aggregate performance when combined with fly ash. Similarly, CO2 emissions and volume of raw materials were lower than the normal-use concrete for all mixes. Concrete mixes with low air permeability and low CO2 footprint had the best balance of durability and environmental impact, as decreasing raw material volume tended to more greatly reduce durability.
AB - Utilization of waste and recycled materials in concrete is necessary to rcducc environmental impact but may have an adverse affect on mechanical properties. This paper investigated the effect of various combinations of fly ash, blast furnace slag, and low-grade recycled aggregates in concrete at three different water-binder ratios on mechanical and environmental performance. The balance between durability and environmental impact for a given strength level similar to normal-use concrete was also examined using analytic hierarchy process. Results showed that increasing the water-binder ratio and volume of recycled aggregate reduced compressive strength and increased air permeability and drying shrinkage. However, compared to normal-use concrete similar or better performance could be achieved, which was attributed to improvement of low-grade recycled aggregate performance when combined with fly ash. Similarly, CO2 emissions and volume of raw materials were lower than the normal-use concrete for all mixes. Concrete mixes with low air permeability and low CO2 footprint had the best balance of durability and environmental impact, as decreasing raw material volume tended to more greatly reduce durability.
KW - Air permeability
KW - Blast furnace slag
KW - Environmental impact
KW - Fly ash
KW - Low-grade recycled aggregate
KW - Shrinkage
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M3 - Conference contribution
AN - SCOPUS:84905462848
SN - 9784832903609
T3 - Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010
SP - 191
EP - 200
BT - Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010
PB - Hokkaido University Press
T2 - 2nd International Conference on Durability of Concrete Structures, ICDCS 2010
Y2 - 24 November 2010 through 26 November 2010
ER -