Assessment of Ultrasonic-Ethanol Extraction to Determine the pH Value of Hardened Cement Pastes

Xiao Ming Xing; Wu Yao

doi:10.4028/www.scientific.net/KEM.492.451

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Assessment of Ultrasonic-Ethanol Extraction to Determine the pH Value of Hardened Cement Pastes

Abstract:

A simple method is presented to extract the pore solution of hardened cement pastes during the first 28 days and to measure the pH value, which is dependent on anhydrous-ethanol extraction (AEE) and improved by the assistance of ultrasonic vibration generator. The results were compared with the pore water expression (PWE) and anhydrous ethanol extraction through observing the variation tendency of pH values along with time and different water-cement ratios (w/c). The study showed that as w/c decreased, the pH value had a rising tendency; the density of [OH^-] extracted by ultrasonic-ethanol extraction (UEE) method is 4-5 times higher than that by AEE method, which indicates the feasibility of UEE method.

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Periodical:

Key Engineering Materials (Volume 492)

Pages:

451-454

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.492.451

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Online since:

September 2011

Authors:

Xiao Ming Xing, Wu Yao

Keywords:

Cement Paste, Ethanol, Pore Solution, Ultrasonic

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