EFFECT OF ALUMINUM ON STRUCTURE AND CHLORIDE ADSORPTION CAPACITY OF C-(A)-S-H

Author(s): Guoqiang Liu, Xiaomei Wan, Tiejun Zhao and Baoxian Yang
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference on UHPC Materials and Structures (UHPC2018-China)
Editor(s): Caijun Shi and Baochun Chen
ISBN: 978-2-35158-219-0
e-ISBN: 978-2-35158-220-6
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 610-617
Total Pages: 8
Language : English

Abstract: In this paper, a series of hydrated calcium silicates with verious induced Aluminum (C-
(A)-S-H) were prepared artificially by chemical precipitation method. The chloride ions
adsorption capacity of C-(A)-S-H were determined through immersion exposure in chloride
solution with pH value of 12, while the structures of C-(A)-S-H with various aluminum
content and Al/Si ratio were characterized by Fourier Infrared Spectroscopy (FTIR), Scanning
Electron Microscopy (SEM) and Nuclear Magnetic Resonance (NMR). The results show that
the Al/Si ratio affects the degree of polymerization and structure of C-(A)-S-H, and affects the
adsorption capacity of chloride ions as while. With the increase of Al/Si ratio from 0 to 0.6,
the degree of polymerization of [SiO4]4- increases, the average chain length increases and the
structure of C-(A)-S-H becomes more dense. At the same time, porosity, specific surface area
of hydrated gel and amount of adsorbed chloride ions decrease with Al/Si ratio. However, the
increase trend becomes mild in the range of Al/Si ratio from 0.4 to 0.6.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00