Assessment of Ultrasonic-Ethanol Extraction to Determine the pH Value of Hardened Cement Pastes
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.
Yiwang Bao, Danyu Jiang, Li Tian and Jianghong Gong
X. M. Xing and W. Yao, "Assessment of Ultrasonic-Ethanol Extraction to Determine the pH Value of Hardened Cement Pastes", Key Engineering Materials, Vol. 492, pp. 451-454, 2012