CARBONATION-RELATED MICROSTRUCTURAL CHANGES IN LONG-TERM DURABILITY CONCRETE

Cláudio Rigo da Silva, Rubens Pedrosa Reis, Wander Luiz Vasconcelos, Fernando Soares Lameiras

Abstract


This paper discusses the effects of carbonation on the microstructure of portland cement concrete for longtermdurability applications. A class C40 concrete (characteristic compression strength between 40 MPa and 44 MPaon the 28th  2  th and 91st  days, respectively.atmosphere after physical and mechanical characterization. It was observed that carbonation provoked a reduction of 5% to 12% of the concreteopen porosity accessible to water. Flexural strength values obtained after the carbonation tests revealed a decrease of12% and 25% in relation to the values obtained before tests on the 28day, according to Brazilian standard NBR 8953) was chosen for the experimental study of the carbonationeffects, from which test samples were molded for accelerated test under a 100%-CO 

Keywords


concrete; carbonation; microstructure; long-term durability

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