THE KINETIC PROCESS AND PARAMETERS FROM ELECTRICAL RESISTIVITY THROUGH HARDENING PASTE, MORTAR AND CONCRETE

Author(s): Lianzhen XIAO and Xiaosheng WEI
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 355-365
Total Pages: 961
Language : English

Abstract: This paper monitored the hydration process for fresh mixing pastes, mortars and concretes using a non-contact electrical resistivity measurement. The bulk resistivity development (ρ(t)-t curves) of fresh paste, mortar and concrete, with various water cement ratios, were obtained for the period from casting to the age of 24 hours. The kinetics parameter Km and D were obtained from the electrical resistivity development of fresh concrete during the decelerating period of hydration process.
The transition point on the transition region marks setting to hardening process. Cement paste with a lower W/C or the addition of aggregate has a higher Km, indicating that Parameter Km represents the rate of densification of the cement matrix during hydration. The pastes, mortars and concretes have quite similar D values, indicating that parameter D represents the hydration rate of a cement particle in the hydration system.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00