Changes in Pore Structure Properties of Cement Paste and Concrete on Carbonation

Author(s): Vineet Shah, Anuj Parashar and Shashank Bishnoi
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 520-525
Total Pages: 6
Language : English

Abstract: Carbonation is one of the major factors affecting the performance of concrete. Calcium hydroxide (CH) and calcium silicate hydrate (C-S-H) which constitutes the major part of the hydration products, aids in maintaining the alkaline environment in concrete. The hydration products get transformed to calcium carbonate (CC) on exposure to carbon dioxide. Because of difference in molar solid volume of the hydrated and carbonated products, overall porosity and pore structure of the concrete system is altered. In this study effect of carbonation on the microstructure of cement paste and concrete cast with ordinary Portland cement, binary and ternary cement have been investigated. Carbonation study was carried out at 3% carbon dioxide concentration, 60% relative humidity and 27°C. Coarsening of pore structure was observed on carbonation in general. For blended cement, the total porosity increased on
carbonation.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00