Suitability of cement combinations for carbonation resistance of structural concrete

TY - JOUR

T1 - Suitability of cement combinations for carbonation resistance of structural concrete

AU - Folagbade, Samuel Olufemi

AU - Newlands, Moray David

PY - 2014/9/30

Y1 - 2014/9/30

N2 - Purpose: This paper aims to assess the suitability of cement combination containing CEM I, fly ash, silica fume and metakaolin for durability design against carbonation-induced corrosion in concrete.Design/methodology/approach: Cube compressive strengths at 28 days and accelerated carbonation depths at 28 days and at various exposure ages were determined at the water/cement ratios of 0.35, 0.50 and 0.65. To assess their suitability for carbonation-induced corrosion, the material costs and embodied carbon dioxide (eCO2) contents of the concretes at equivalent performance were compared.Findings: Cement combination concretes achieved equal carbonation resistance with CEM I at higher compressive strengths, lower water/cement ratios and higher cement contents. The comparison of the concretes, at equivalent performance, based on the carbonation-induced corrosion exposure classes XC3 and XC4 (Table A.4 of BS 8500-1), shows that ternary and more binary cement concretes have lower costs and eCO2 contents than those recommended in Table A.6 of BS 8500-1.Research limitations/implications: This analysis is limited to a working life of 50 years. Further research is needed to verify the suitability of the cement combinations for a working life of 100 years and for the other aspects of durability design covered in BS 8500.Practical implications: Cement combination concretes have lower eCO2 content. Hence, when they are cheaper than CEM I concrete at equivalent performance, they would make concrete construction more economic and environmentally compatible.Originality/value: This research suggests the inclusion of metakaolin and ternary cement combination concretes in BS 8500 for durability design against carbonation-induced corrosion.

AB - Purpose: This paper aims to assess the suitability of cement combination containing CEM I, fly ash, silica fume and metakaolin for durability design against carbonation-induced corrosion in concrete.Design/methodology/approach: Cube compressive strengths at 28 days and accelerated carbonation depths at 28 days and at various exposure ages were determined at the water/cement ratios of 0.35, 0.50 and 0.65. To assess their suitability for carbonation-induced corrosion, the material costs and embodied carbon dioxide (eCO2) contents of the concretes at equivalent performance were compared.Findings: Cement combination concretes achieved equal carbonation resistance with CEM I at higher compressive strengths, lower water/cement ratios and higher cement contents. The comparison of the concretes, at equivalent performance, based on the carbonation-induced corrosion exposure classes XC3 and XC4 (Table A.4 of BS 8500-1), shows that ternary and more binary cement concretes have lower costs and eCO2 contents than those recommended in Table A.6 of BS 8500-1.Research limitations/implications: This analysis is limited to a working life of 50 years. Further research is needed to verify the suitability of the cement combinations for a working life of 100 years and for the other aspects of durability design covered in BS 8500.Practical implications: Cement combination concretes have lower eCO2 content. Hence, when they are cheaper than CEM I concrete at equivalent performance, they would make concrete construction more economic and environmentally compatible.Originality/value: This research suggests the inclusion of metakaolin and ternary cement combination concretes in BS 8500 for durability design against carbonation-induced corrosion.

KW - Carbonation

KW - Cement combination

KW - Concrete durability

KW - Corrosion

UR - https://www.scopus.com/pages/publications/84914173777

U2 - 10.1108/JEDT-08-2012-0033

DO - 10.1108/JEDT-08-2012-0033

M3 - Article

AN - SCOPUS:84914173777

SN - 1726-0531

VL - 12

SP - 523

EP - 539

JO - Journal of Engineering, Design and Technology

JF - Journal of Engineering, Design and Technology

IS - 4

ER -