The carbonation of autoclaved aerated concrete

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Cement and Concrete Research

DOI:https://doi.org/10.1016/S0008-8846(97)00024-0· OSTI ID:511900

Hanecka, K; Koronthalyova, O; Matiasovsky, P ^[1]

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1. Slovak Academy of Sciences, Bratislava (Slovakia). Inst. of Construction and Architecture

During the long-term investigation of the physical properties of autoclaved aerated concrete (AAC) in the indoor environment with changing relative humidity and temperature the significant increase of the AAC density was found. It was proved that the increase of the density was a consequence of carbonation process. For the investigated types of the AAC the ultimate increase of density was proportional to initial dry density of the AAC. It was found as well that relative volumes of the micropores (with radius from 3.5 nm to 7,500 nm) of the investigated types of the AAC are proportional to their dry densities. The simulation of the time courses of density increase due to carbonation based on solution of modified diffusion equation was done. In spite of using simplifications (constant value of CO{sub 2} diffusion coefficient, neglecting the relative humidity changes), the calculated time courses coincided sufficiently with the measured ones.

• OSTI ID: 511900
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 4 Vol. 27; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
AUTOCLAVES
BULK DENSITY
CARBON DIOXIDE
CHEMICAL REACTIONS
CONCRETES
DIFFUSION
MATHEMATICAL MODELS
POROSITY
VALIDATION