The Relation between Porosity, Microstructure and Strength, and the Approach to Advanced Cement-Based Materials [and Discussion]
A theory is formulated to connect the strength of cement paste with its porosity. The theory shows that bending strength is largely dictated by the length of the largest pores, as in the Griffith (1920) model, but there is also an influence of the volume of porosity, which affects toughness through...
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Veröffentlicht in: | Philosophical transactions of the Royal Society of London. Series A: Mathematical and physical sciences 1983-09, Vol.310 (1511), p.139-153 |
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Sprache: | eng |
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Zusammenfassung: | A theory is formulated to connect the strength of cement paste with its porosity. The theory shows that bending strength is
largely dictated by the length of the largest pores, as in the Griffith (1920) model, but there is also an influence of the
volume of porosity, which affects toughness through changing elastic modulus and fracture energy. Verification of this theory
was achieved by observing the large pores in cement, and then relating bending strength to the measured defect length, modulus
and fracture energy. The argument was proved by developing processes to remove the large pores from cement pastes, thereby
raising the bending strength to 70 MPa. Further removal of colloidal pores gave a bending strength of 150 MPa and compression
strength up to 300 MPa with improved toughness. Re-introduction of controlled pores into these macro-defect-free (MDF) cements
allowed Feret's law (1897) to be explained. |
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ISSN: | 1364-503X 0080-4614 1471-2962 2054-0272 |
DOI: | 10.1098/rsta.1983.0073 |