Performance-based design and carbonation of concrete with high fly ash content

By Akli Younsi, Philippe Turcry, E. Rozière, A. Aït-Mokhtar, A. Loukili. 2011

140 citations recorded by the source corpus.

This paper reports on an investigation of the durability of high-volume fly ash concrete exposed to carbonation (XC class in EN 206-1 Standard). The reduction of cement content is assumed to mitigate CO2 emissions due to the production of Portland cement clinker. The durability of concrete is assessed through a performance-based approach. First, a performance-based method was applied to design a concrete mixture with more than 50% substitution of cement by fly ash. To cope with the high viscosity of the so-obtained mixture, an air-entraining agent was used. Due to its low cement content, the so-obtained mixture does not comply with the prescriptive requirements of the European standard (EN 206-1). Thus, according to the equivalent performance concept, its potential durability has to be proved through comparison with reference mixtures complying with prescriptive standard requirements. The performance-based evaluation of the durability of the designed mixture and reference mixtures (with Portland cement and blended cement) consisted in porosity and accelerated carbonation tests. The influence of curing mode and thermal treatment duration before carbonation test were also investigated. Whatever the curing mode, the designed mixture was found as resistant to accelerated carbonation as the reference mixture containing blended cement.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/b0b961398e6e17d9c6eb7861ee9afa89f4017be7

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In Civil and Structural Engineering

In Materials Chemistry

Citations in the corpus

Calcined clay – Limestone cements: Hydration processes with high and low-grade kaolinite clays (2021, background): “Fly ash, blast furnace slag or silica fume have been widely studied ([1]–[5]), hydration mechanisms are now quite well understood ([6]) and they are the most commonly used SCMs.”
An overview on concrete carbonation in the context of eco-efficient construction: Evaluation, use of SCMs and/or RAC (2012, methodology): “[12] when fly-ash concrete mixes are stored 28 days under water before testing (water-curing), similar carbonation depths were measured for the two mixes (30% and 50% fly-ash), also whatever the prior oven-drying period.”