In this work, both dynamic water vapor sorption (DVS) and low temperature calorimetry (LTC) methods were adopted to study the pore size distribution of cement pastes prepared by two types of cements CEM I and CEM III. A model porous material, MCM-41, was also included in order to in-vestigate important aspects of the measurement and the data evaluation ap-proaches. As indirect methods for pore structure characterization, important as-sumptions involved in the data analysis of both methods were highlighted and discussed. In addition, a special attention was paid to the comparison of the re-sults obtained from the two methods. A careful examination of the bases for the two methods for pore structure characterization revealed that a number of mat-ters could affect the obtained results, including sample preparation, possible in-fluencing factors on the measured results, unsolved factors for data analysis, etc. Consequently, the results obtained from one method might differ signifi-cantly from the other. Nevertheless, a certain degree of agreement was still found for the pore size distributions determined by the DVS and the LTC meth-ods, despite of the uncertainties involved in each method. Meanwhile, it was concluded that probably none of the two studied methods could deliver the “true” (actual) pore size distribution information at this stage. To further im-prove the accuracy of the results obtained from the methods, it was highlighted that emphases should be laid on clarifying relevant assumptions made in both measurement and data analysis.
|Title of host publication||Proceedings of the 3rd RILEM Spring Convention and Conference|
|Number of pages||12|
|Publication status||Accepted/In press - 2020|
|Event||3rd RILEM Spring Convention 2020 - Guimarães, Portugal|
Duration: 10 Mar 2020 → 14 Mar 2020
|Conference||3rd RILEM Spring Convention 2020|
|Period||10/03/2020 → 14/03/2020|
- Pore size distribution
- Low temperature calorimetry
- Cement paste
Wang, T., & Wu, M. (Accepted/In press). Pore size distribution of cement based materials determined by dynamic water vapor sorption and low temperature calorimetry. In Proceedings of the 3rd RILEM Spring Convention and Conference Rilem publications.