Study on the properties of young concrete with fly ash using electrical measurement

Title: Study on the properties of young concrete with fly ash using electrical measurement
Author(s): Zongjin Li, Lianzhen Xiao, Xiaosheng Wei
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 11
Language: English

Abstract: This paper describes the results of an investigation using electrical resistivity measurement to detect the time varying bulk resistivity development (rho-t curves) and pore solution resistivity development (rho0-t curves) of young concrete, with and without fly ash. The resistivity (rho) development with time (t) can be divided into a phi0 dominating period and a phi ?dominating period. The porosity formation process (phi-t curves) is derived from the rho-t curves, rho0-t curves, initial porosity and MIP data. Concrete with fly ash initially has a higher bulk electrical resistivity than without fly ash; however after a period of about 10 to13 hours, its effect is reversed. The results show that fly ash acts as a micro-aggregate insulator during the ions dissolving period, having a slower reaction and a lower pore-decreasing rate which contributes to a lower electrical resistivity in the hardening period. The results from the electrical resistivity method agree with other methods, such as SEM examination and mechanical compression strength testing at 3 days.

Online publication: 2004-03-25
Classification: Measuring W/C and Porosity
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.015