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.
Xiaoming Xing Wu Yao
Institute of Smart Construction Material, Tongji University, 4800 Caoan Road, Shanghai 201804, China
国际会议
长沙
英文
451-454
2011-06-30（万方平台首次上网日期，不代表论文的发表时间）