Pore size distribution of cement based materials determined by dynamic water vapor sorption and low temperature calorimetry

Tian Wang, Min Wu*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

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.
Original languageEnglish
Title of host publicationProceedings of the 3rd RILEM Spring Convention and Conference
Number of pages12
PublisherRilem publications
Publication statusAccepted/In press - 2020
Event3rd RILEM Spring Convention 2020 - Guimarães, Portugal
Duration: 10 Mar 202014 Mar 2020

Conference

Conference3rd RILEM Spring Convention 2020
CountryPortugal
CityGuimarães
Period10/03/202014/03/2020

Keywords

  • Pore size distribution
  • Sorption
  • Low temperature calorimetry
  • Cement paste

Cite this

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.