Abstract
The aim of this work was to examine the microstructural changes of CEM I standardised cement mortar caused by accelerated carbonation (20% CO2 concentration) using porosity accessible to water and nitrogen adsorption. The conflicted results obtained by these two techniques showed the differences in porous domains explored, while the pore size distributions calculated from nitrogen adsorption provided evolution of the micro and meso pores during carbonation. The porosity accessible to water showed changes in all three porous domains: macro, meso and micro pores. This is because of difference in the molecular sizes between water and nitrogen molecules. Although these two techniques are different, they help to complementarily evaluate the effects of carbonation. The results also indicated the influence of type of cement on microstructural evolutions and the correlation between variations of mesopores volume and specific surface area. Changes in microstructure induce changes in macroscopic properties that we also examined such as the solid phase volume using helium pycnometry, the gas permeability, the thermal conductivity, the thermal diffusivity, and the longitudinal and transverse ultrasonic velocities.
Highlights
Carbon dioxide from the air can react with the portlandite Ca(OH)2 and the calcium silicate hydrate C-S-H inHow to cite this paper: Pham, S.T. (2014) Effects of Carbonation on the Microporosity and Macro Properties of Portland Cement Mortar CEM I
We propose to investigate the evolution of the microstructure caused by the carbonation in a cementitious matrix (CEM I cement mortar) using nitrogen adsorption, which is suitable for meso pores with radii of 2 nm to 32 nm [7]
Changes in microstructural level will help to discuss the evolutions of macro properties that we propose to measure, such as the solid phase volume, the gas permeability, the thermal conductivity, the thermal diffusivity, the longitudinal and transverse ultrasonic velocities
Summary
Carbon dioxide from the air can react with the portlandite Ca(OH) and the calcium silicate hydrate C-S-H inHow to cite this paper: Pham, S.T. (2014) Effects of Carbonation on the Microporosity and Macro Properties of Portland Cement Mortar CEM I. Carbon dioxide from the air can react with the portlandite Ca(OH) and the calcium silicate hydrate C-S-H in. How to cite this paper: Pham, S.T. (2014) Effects of Carbonation on the Microporosity and Macro Properties of Portland Cement Mortar CEM I. Journal of Materials Science and Chemical Engineering, 2, 40-52. Pham concrete to form calcium carbonate CaCO3. This process is called carbonation, which is a natural aging process for all cement materials.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Journal of Materials Science and Chemical Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.