International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
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Effects of Carbonation on the Microstructure of Cement Materials: Influence of Measuring Methods and of Types of Cement

  • Pham, Son Tung (Laboratory of Civil Engineering and Mechanical Engineering, National Institute of Applied Sciences) ;
  • Prince, William (Laboratory of Civil Engineering and Mechanical Engineering, National Institute of Applied Sciences)
  • Received : 2014.01.30
  • Accepted : 2014.05.07
  • Published : 2014.12.30
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Abstract

The objective of this work was to examine the influence of carbonation on the microstructure of cement materials. Different materials, which were CEM I mortar and paste, CEM II mortar and paste, were carbonated at $20^{\circ}C$, 65 % relative humidity and 20 % of $CO_2$ concentration. The specific surface area and pore size distribution were determined from two methods: nitrogen adsorption and water adsorption. The results showed that: (1) nitrogen adsorption and water adsorption do not cover the same porous domains and thus, we observed conflicts in the results obtained by these two techniques; (2) the CEM II based materials seemed to be more sensible to a creation of mesoporosity after carbonation than the CEM I based materials. The results of this study also helped to explain why observations in the literature diverge greatly on the influence of carbonation on specific surface area.

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References

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