Study on chemical shrinkage and electrical resistivity of cement pastes at early age

Author(s): Yishun Liao and Xiaosheng Wei
Paper category: Conference
Book title: 2nd International Conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. van Breugel, Wei Sun and Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 332 – 341
Total Pages: 10
Language: English

Abstract: This paper focuses on the correlation between electrical resistivity and chemical shrinkage when these two independent techniques were used to study the hydration of Portland cement. The electrical resistivity during 3 days was measured by a non-contacting electrical resistivity apparatus. The chemical shrinkage during 28 days was measured by dilatometry described in ASTM Standard C1608-07. The experiments were conducted on the Portland cement pastes with different water to cement (W/C) ratios of 0.3, 0.4 and 0.5 cured at 20 ºC. The results obtained show that the relationship between electrical resistivity and chemical shrinkage appears to be linear after 12 h. The non-evaporable water was measured for determining the degree of hydration of the cement pastes. The evolution of chemical shrinkage and electrical resistivity can be used to determine the degree of hydration.

Key words: Chemical shrinkage; Electrical resistivity; Portland cement; Hydration; Degree of hydration; Non-evaporable water.

Online publication: 2012
Publication Type: full_text
Public price (Euros): 0.00