STUDIES ON CEMENT PASTE AND CONCRETE BOTH MADE WITH LOW POROSITY CEMENT
Cement paste and concrete were examined in detail. Studies were carried out on the rheological behavior prior to hardening, on the hydration process, on the microstructure of the hardened products in compressive strength, on permeability and on pore size distribution. For concrete, the properties investigated included rheological behavior and workability in the fresh state and compressive strength, flexural strength, and dynamic modulus of elasticity in the hardened condition. It was found that excellent consistency and flow behavior could be produced in both cement pastes and concretes formulated at low water content. Lower cement contents produced a loss of consistency and a degradation of the flow properties of the fresh concretes. Higher cement contents, on the other hand, improved the workability of concrete and increased its compressive strength. It was found that hydration of the paste was small over the first 18 hours, but then accelerated noticeably. The time of setting of low porosity cement paste was found to coincide accurately with the end of its dormant period as indicated by temperature evolution measurements. For concrete, compressive strength development was rapid following the first day. It was observed that flexural strengths and dynamic elastic modulii were significantly higher than would be expected for high-strength concretes of similar compressive strength made with ordinary Portland cement. Tests indicate that low porosity cement paste is much less permeable, less porous, and "tighter" than ordinary Portland cement paste at any given age.
Purdue University/Indiana Department of Transportation JHRPPurdue University, School of Civil Engineering
West Lafayette, IN United States 47907-1284
- Gomez-Toledo, C
- Publication Date: 1977-7-6
- Features: Figures; Tables;
- Pagination: 143 p.
- TRT Terms: Cement paste; Compressive strength; Concrete; Flexural strength; Hydration; Modulus of elasticity; Permeability; Polymer concrete; Pore size distribution; Porosity; Portland cement; Rheology; Workability
- Subject Areas: Highways; Materials;
- Accession Number: 00165506
- Record Type: Publication
- Report/Paper Numbers: File No. 5-14-7 Final Rpt.
- Files: TRIS
- Created Date: Jan 13 1978 12:00AM