Investigation of mechanical properties and carbonation of concretes


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Construction and Building Materials Volume 153, 30 October 2017, Pages 704-715

Investigation of mechanical properties and carbonation of concretes with construction and demolition waste and fly ash Sérgio Roberto da Silva a

, Jairo José de Oliveira Andrade b

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Highlights •

Mechanical properties and durability of concretes with recycled aggregate and fly ash were evaluated.

Five levels of recycled coarse aggregate (RCA) substitution for construction and demolition (C&D) materials and 5 levels of fly ash in replacement Portland cement were investigated.

For results analysis, statistical analysis (ANOVA) and mathematical models were used.

The increase in the substitution level of natural aggregate by recycled aggregate reduces the mechanical properties.

The synergic effect of RCA and fly ash in carbonation process was investigated.

Abstract The cement industry is one of the segments that release large amounts of carbon dioxide into the atmosphere during its manufacturing process, which consists of fuels burning. As the demand for concrete grows every year, the use of recycled coarse aggregate (RCA) in the construction industry can pose a significant effort to achieve a more sustainable construction. The present study investigated the mechanical properties (compressive and tensile strength) and durability (water absorption and carbonation depth) of concretes with different RCA substitution levels (25%, 50%, 75%, and 100%) instead of natural coarse aggregate, as well as replacement of Portland cement by fly ash in some levels (10%, 15%, 25%, and 30%) for different water/binder ratios (0.40, 0.45, 0.50, 0.55, and 0.65). All the results were statistically analyzed and showed that the mechanical properties decrease with the increase of replacement levels. Besides, the fly ash has a major influence on concretes with higher RCA replacement levels and water binder ratio. The carbonation of concretes with RCA and fly ash have a holistic effect, when 30% of replacement of cement by fly ash the carbonation over time was quite similar to the reference concrete.

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Keywords Concrete; Construction and demolition waste; Fly ash; Mechanical properties; Carbonation

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