Journal
CEMENT AND CONCRETE RESEARCH
Volume 161, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2022.106942
Keywords
Mercury porosimetry; Ink-bottle effect; Connectivity; Pore size distribution; Critical pore diameter
Funding
- National Natural Science Foundation of China [51978171]
- Key Laboratory of Advanced Civil Engineering Materials (Tongji University) , Ministry of Education [202102]
- Qishan Scholar (Overseas) Program of Fuzhou University [GXRC-19023]
- Natural Science Foundation of Fujian Province, China [2020J01482]
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Reliable characterization of the pore structure in cementitious materials is crucial for durability studies. Commonly used mercury intrusion porosimetry is affected by the ink-bottle effect, which affects the accuracy of pore size measurement. Two alternative methods, pressurization-depressurization cycling and intrusion-extrusion cyclic mercury porosimetry, have been developed to improve pore size estimation in cementitious materials.
Reliable characterization of the pore structure is essentially important for transport-related durability studies of cementitious materials. Mercury intrusion porosimetry has been commonly used for pore structure measurement while the ink-bottle effect significantly affects the trustworthiness of pore size features of cementitious materials. Pressurization-depressurization cycling mercury intrusion porosimetry (PDC-MIP) is an alternative approach previously reported with the purpose to provide better estimates of pore size results. It is found however that the PDC-MIP greatly overestimates the ink-bottle pore volume owing to the incomplete extrusion of mercury in throat pores after the pressurization-depressurization cycle. Intrusion-extrusion cyclic mercury porosimetry (IEC-MIP), as a further improvement, is then described, which can reliably capture the ink-bottle effect and obtain a clear picture of the distribution of the ink-bottle pores in cementitious materials. The ink-bottle effect of cement pastes is observed being pore size-dependent and the role of critical pores is emphasized. Water-cement ratio primarily changes the effective porosity while plays a minor role in the ink-bottle porosity. The addition of reactive blends substantially enhances the ink-bottle effect during mercury penetration into small pores. IEC-MIP tests, together with a unique data analysis, enable to obtain a more truthful pore size distribution.
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