Carbonation-Related Microstructural Changesin Long-Term Durability Concrete

Materials Research

Cláudio A. Rigo Da Silva²  Rubens J. Pedrosa Reis¹  Fernando Soares Lameiras¹  Wander Luiz Vasconcelos¹ 

[1] ,Federal University of Minas Gerais Dep. of Materials Engineering and Civil Construction Belo Horizonte MG ,Brazil

关键词: concrete;    carbonation;    microstructure;    long-term durability;   

DOI  :  10.1590/S1516-14392002000300012

来源: SciELO

【 摘 要 】

This paper discusses the effects of carbonation on the microstructure of Portland cement concrete for long-term durability applications. A class C40 concrete (characteristic compression strength between 40 MPa and 44 MPa on the 28th day, according to Brazilian standard NBR 8953) was chosen for the experimental study of the carbonation effects, from which test samples were molded for accelerated test under a 100%-CO2 atmosphere after physical and mechanical characterization. It was observed that carbonation provoked a reduction of 5% to 12% of the concrete open porosity accessible to water. Flexural strength values obtained after the carbonation tests revealed a decrease of 12% and 25% in relation to the values obtained before tests on the 28th and 91st days, respectively.

【 授权许可】

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