STRENGTH VERSUS STRUCTURE IN CEMENT PASTES
The purpose of the present work was to study cement paste materials with regard to experimental data on strength properties and their relations to structural and compositional data at various stages of hydration and hardening. An attempt is made to correlate empirical data with certain theories on the strength vs. structure relationships, by using a structure variable of the character of an effective volume fraction of solid, and composed of contributions from the different solid phase in the composite material. Using tentatively the somewhat arbitrary criterion that the strength vs. effective solid volume fraction relationship should be unique for a certain strength property, the results of a preliminary analysis indicate that the whole volume of gel and about half the volume of remaining cement compounds contribute to the observed strength data. The unique fractions found in this way for compressive strength and surface microhardness are straight lines in log-log plots. The tensile strength, however, is limited or even reduced towards higher solid volume densities. This effect can be due to the development of crack-type pores, possibly those observed between lamellae in segregated stacks of calcium hydroxide crystals.
- Paper was presented at the 6th International Symposium on the Chemistry of Cement, Moscow, September 23 to 27, 1974.
Cement and Concrete Research InstituteDrottning Kristinas Vaeg 26
Stockholm 70, Sweden
- Grudemo, A
- Publication Date: 1975
- Features: Figures; References;
- Pagination: 15 p.
- TRT Terms: Cement paste; Composite materials; Compressive strength; Concrete hardening; Gels; Hardness; Hydration; Strength of materials; Structures; Tensile strength; Volume
- Subject Areas: Bridges and other structures; Highways; Materials;
- Accession Number: 00141536
- Record Type: Publication
- Report/Paper Numbers: CBI 13:75
- Files: TRIS
- Created Date: Nov 17 1976 12:00AM