Abstract
According to the Spanish National Research Council (CSIC) report, the ex-situ leaching method (ESL) is more appropriate and accurate than other methods for measuring pH value in terms of repeatability and reproducibility. In this study, the ESL method was used to measure the pH value of cement matrix materials. The design test process aimed to avoid underestimating the variation in pH during the process of solution stirring and pH measurement without using both argon and nitrogen to block the specimen contact with air, with good repeatability and reproducibility. This study also considered the influence of the dryness of the specimen before crushing, the size of the powder, the air-exposed specimen, the air-exposed solution, the temperature of the solution, etc. After testing and analysis, a standard procedure for detecting the pH value of cement matrix materials was established which is known as the S-ESL method.
Highlights
Introduction of Measuring the pHValue of CementTo measure the pH value of concrete, Larbi et al [1] compressed the fresh concrete to squeeze the pore solution, and vacuum filtered it for chemical composition analysis and pH measurement
ordinary Portland cement (OPC) paste was cured for seven days, the powder was obtained according to the standard S-ex-situ leaching method (ESL) method, eight beakers were taken to make eight parts of the solution, and the test was carried out according to the standard S-ESL procedure
The OPC paste was cured for seven days, the powder was obtained according to the standard S-ESL method
Summary
To measure the pH value of concrete, Larbi et al [1] compressed the fresh concrete to squeeze the pore solution, and vacuum filtered it for chemical composition analysis and pH measurement. Paudel [9] developed a modified in situ leaching method to achieve a more accurate method using for measuring pH value of fly-ash geopolymer concrete. Another pH measurement method which is called ex situ leaching methods (ESL) is well-known for faster and easier due to its simple procedures and no special or expensive equipment required [10]. According to Plusquellec et al [11], a majority of ESL methods should include the following steps: (1) ground concrete is powdered, (2) leaching of the powder with a known amount of deionized water in a set time, (3) the solution is filtered, (4) the extracted solution is analyzed. S-ESL method is according to the above test results, by improving the standard procedures of ESL to simplify the equipment required of test, but still achieve the accuracy of pH measurement
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