A novel method to predict concrete carbonation.


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Title: A novel method to predict concrete carbonation.

Author(s): Paulo Roberto Do Lago Helene & Pedro Castro Borges

Publication: IMCYC

Volume: 1

Issue: 1

Appears on pages(s): 25-35

Keywords: Carbonation-C; Corrosion-C; Durability-C; Concrete-E; Mixture Proportion

Date: 7/1/2009

Although the causes, mechanisms, and factors which promote concrete carbonation have been widely studied, factors that come into play during concrete fabrication such as mix proportioning combinations - a critical factor influencing the rate of carbonation - have not been properly researched or modeled. The present work involved the fabrication of concrete samples with different slumps, cement contents, and water/cement ratios which were subjected to tests of accelerated carbonation. As reported in previous studies, the water/cement ratio had the greatest influence on concrete carbonation rates. Cement content did not influence the carbonation rate when the water/cement ratio was kept constant; however, if the workability was fixed, an increase in cement content led to a reduction in carbonation depth. By conducting this experiment, the main objective of the present study was to demonstrate how a mix design nomogram, aside from being a powerful tool for the practitioner, can serve to predict and reduce the degree of concrete carbonation by identifying the most appropriate mixture parameters.

Mexican Institute of cement and concrete, International Partner Access.