Asympotic experimental study on static and dynemic moduli of ettringite crystal

Title: Asympotic experimental study on static and dynemic moduli of ettringite crystal
Author(s): M. Zhang, J-k. Chen, J. Zhu, J-g. Chen
Paper category : conference
Book title: The 50-year Teaching and Research Anniversary of Prof. Sun Wei on Advances in Civil Engineering Materials
Editor(s): C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-098-1
e-ISBN: 978-2-35158-099-8
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 181 - 190
Total Pages: 10
Nb references: 21
Language: English

Abstract: Under the environment of seawater, the decrease of durability of concrete structures is mainly induced by erosion of seawater. If the sulfate ions get into voids in the concrete, nucleation and growth of calcium sulphoaluminate crystal (i.e., ettringite) may take place. The internal pressure will occur due to the delay ettringite crystal, and this may lead to damage evolution in concrete. In order to study the damage evolution, the modulus of ettringite should be determined. In this paper, macro experimental methods are adopted to evaluate the static and dynamic moduli of ettringite. There are three processes in the experiments. Firstly, crystals of ettringite are obtained in terms of the synthesizing method. Secondly, powders of ettringite are compressed to form specimens. Thirdly, the moduli of ettringite are measured by macro experimental methods. In this paper, both the static modulus and the dynamic modulus have been measured. Experimental results indicate that the magnitude of the static modulus of ettringite is approximately 9.3 GPa, while that of the dynamic modulus is about 17.4 GPa.
Those results will be useful for the analysis of damage evolution in concrete materials due to the erosion of sulphate in seawater.

Online publication: 2010-04-22
Publication type : full_text
Public price (Euros): 0.00