Durability of RC structures made from blended cement: Carbonation and chloride ingress

Durability of RC structures made from blended cement: Carbonation and chloride ingress

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The cement industry is responsible for producing about 7% of total global CO2 emissions. In last few years substantial efforts have been made to achieve some enhancements, in this respect, by increasing the production of blended cements using solid industrial by-products (fly ash, condensed silica fume, metallurgical slag, etc.) as well as some natural pozzolanic materials (volcanic tuffs, diatomaceous earth, etc.). These materials exhibit cementitious and/or pozzolanic properties and can be characterized as supplementary cementing materials (SCM). The production of such cements is believed to be a less CO2 intensive one. Considering the degradation of reinforced concrete structures the corrosion of reinforcement is dominant and the carbonation of concrete and the chloride penetration are the main mechanisms that pave the way for an initiation of such corrosion. Therefore, the focus of this paper is the durability of reinforced concretes made from blended cement, concentrating on carbonation progress and chloride ingress modeling, the influence of random properties of involved variables and some reliability consequences. The parametric studies are provided. Presented software tools may serve as an effective support for durability design of reinforced concrete structures.

The cement industry is responsible for producing about 7% of total global CO2 emissions. In last few years substantial efforts have been made to achieve some enhancements, in this respect, by increasing the production of blended cements using solid industrial by-products (fly ash, condensed silica fume, metallurgical slag, etc.) as well as some natural pozzolanic materials (volcanic tuffs, diatomaceous earth, etc.). These materials exhibit cementitious and/or pozzolanic properties and can be characterized as supplementary cementing materials (SCM). The production of such cements is believed to be a less CO2 intensive one. Considering the degradation of reinforced concrete structures the corrosion of reinforcement is dominant and the carbonation of concrete and the chloride penetration are the main mechanisms that pave the way for an initiation of such corrosion. Therefore, the focus of this paper is the durability of reinforced concretes made from blended cement, concentrating on carbonation progress and chloride ingress modeling, the influence of random properties of involved variables and some reliability consequences. The parametric studies are provided. Presented software tools may serve as an effective support for durability design of reinforced concrete structures.

service life, blended cement, carbonation, chloride ingress, modeling

service life, blended cement, carbonation, chloride ingress, modeling

CHROMÁ, M.; ROVNANÍK, P.; VOŘECHOVSKÁ, D.

11.01.2007

ČVUT

Praha

978-80-01-03687-7

Proceedings of the 6th International Seminar on ECS

97

102

6

http://hdl.handle.net/