Microstructural and Morphological Studies of Ordinary Portland Cement Paste and Fly Ash based Geopolymer in the presence of Chloride Ions

Author(s): Pavithra Parthasarathy, Asad Hanif, Hongyu Shao and Zongjin Li
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: 648-656
Total Pages: 9
Language : English

Abstract: This paper presents the microstructural and morphological studies carried on ordinary portland cement paste and fly ash based geopolymer in the presence of chloride ions. Cement and geopolymer pastes were made with seawater and the resulting reaction products were analysed for phase composition, hydration degree, microstructural, and morphological features. The experimental results showed that in seawater cement paste, Friedel’s salt was formed as hydration product co-existing with C-S-H and Ca(OH)2. Chloride ions present in seawater promoted the Friedel’s salt formation and increased the Ca(OH)2 content. However, it was found that the presence of Friedel’s salt decreased at later age. In geopolymer samples, use of seawater enhanced the formation of C-A-S-H phase. Microstructure of the seawater cement paste and geopolymer samples are much denser and smoother than the normal water cement paste and geopolymer samples. Presence of chloride ions in seawater densified the microstructure of seawater cement paste samples. For geopolymer samples, presence of the C-A-S-H phase made its microstructure denser and the chloride ions present in seawater was immobilized by fly ash.

Online publication : 2017
Publication type : full_text
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