TY - GEN
T1 - Pore size distribution of cement based materials determined by dynamic water vapor sorption and low temperature calorimetry
AU - Wang, Tian
AU - Wu, Min
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Pore size distribution
KW - Sorption
KW - Low temperature calorimetry
KW - Cement paste
U2 - 10.1007/978-3-030-76551-4_32
DO - 10.1007/978-3-030-76551-4_32
M3 - Article in proceedings
SN - 978-3-030-76550-7
T3 - R I L E M Bookseries
SP - 355
EP - 367
BT - Proceedings of the 3rd RILEM Spring Convention and Conference (RSCC 2020)
A2 - Valente, I. B.
A2 - Ventura Gouveia , A.
A2 - Dias, S. S.
PB - Springer
CY - Cham
T2 - 3rd RILEM Spring Convention 2020
Y2 - 10 March 2020 through 14 March 2020
ER -