A carbonation prediction model for accelerated carbonation testing of concrete

Abstract

This Paper reports an experimental investigation to establish the influence of ambient CO2, concentration, exposure temperature and curing duration on the rate of carbonation in concrete. The test specimens were concrete cylinders 100 mm in diameter and 200 mm high. Of the parameters investigated, the standard 28-day compressive strength f28 was found to be effectively representative of the concrete quality in several carbonation models proposed. Index test results, i.e. water absorption and sorptivity, were also incorporated to depict the effects of the surface property of concrete. The proposed models agreed well with the experimental data.

Theoretically Identified Strong Coupling of Carbonation Rate and Thermodynamic Moisture States in Micropores of Concrete

“…It can be seen that appropriate modeling of CO 2 diffusivity as well as the reaction rate coefficient greatly improves the simulation of the carbonation process in both accelerated and natural carbonation cases. Figure 11 shows the influence of the water-to-cement ratio on the numerical prediction of carbonation depth and its comparison with Uomoto's model (Uomoto and Takada 1993) and the experiment of Loo et al (1994). The influence of the porosity reduction factor was also examined as shown in Fig.…”

Cost-effective design of reinforced concrete with use of self-terminated carbonation model

“…The most common model used by most of the researchers (e.g. mentioned before [6][7][8][9][10][11][12][13][14][15][16][17]) as a basic model that determines the depth of carbonation, x after the time of exposure, t can be expressed in the form:…”

Modelling of concrete carbonation; is it a process unlimited in time and restricted in space?

“…This model is used by most researchers, for example, Bars et al [15], Burkan et al [16], Hossain et al [17], Ishida and Maekawa [18,19], Loo et al [20], Masuda [21]. These Ming Liang et al [22], Monteiro et al [23], Muntean [13], Steffens et al [24] as a basic model that determines the depth of carbonation x after the time of exposure t in the concentration of CO 2 equal to ϕ ext :…”