PERCOLATION IN CEMENTITIOUS MATERIALS UNDER FREEZE-THAW CYCLES INVESTIGATED BY MEANS OF ELECTRICAL RESISTIVITY

Author: Zhendi Wang, Ling Wang, Yan Yao
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference Segment on Frost Action in Concrete
Editor(s): Marianne Tange Hasholt, Katja Fridh and R. Doug Hooton
ISBN:978-2-35158-182-7
e-ISBN:978-2-35158-183-4
Publisher:RILEM Publications SARL
Publication year:2016
Pages:212-221
Total Pages:10
Language:English

Abstract: Percolation in cement-based materials under cyclic freezing and thawing was observed by electrical resistance measurement. Wenner method was employed to determine the electrical response, reference mortar and mortar with 0.5wt.% of cement mass of analytically pure AgI were investigated in this study. Plots of electrical resistivity in terms of time and temperature were used to analyse the percolation process. Results show that ice played a decisive role in the percolation of electric current. Two phases of electrical resistivity in terms of temperature during freezing and thawing was picked out. Depercolation during freezing and repercolation during thawing occurred, and the percolation electrical resistivity remains 800-900 ohm.m for mortar with AgI. The percolation in reference mortar was not observed due to the water content and high degree of surpecooling of pore water. Because depercolation and repercolation occur at certain diameter of pores, the findings may provide a new perspective
for in-suit pore structure determination.

Online publication:2016
Publication type:full_text
Public price (Euros):0.00