COMPARISON OF TYPE I AND TYPE II PORTLAND CEMENTS
In the autumn of 1975, a research program was initiated to determine if advantages would be experienced by changing the Maine Department of Transportation's specification requiring Type II portland cement to permit the use of Type I. The one in-state cement company, on numerous occasions, had requested such a change. The study included both chemical analysis and physical testing of both Type I and Type II cements from four different manufacturers. In most cases, the physical properties of the cements related closely to these anticipated by the chemical analysis. The Type II cements exhibited lower tricalcium silicate, higher dicalcium silicate, and lower tricaccium aluminate than the Type I cements. This corresponds to the physical characteristics, of Type II, which shows more stable hydration, greater long term strength gains, less volume change, greater resistance to sulfates and in conjunction with entrained air-greater durability. Because of the severe climatic conditions experienced in Maine, strong considerations should be made to limit alkali contents, heat of hydration, and fineness. The optional requirements of AASHTO M 85 should be specified to limit the sum of tricalcium silicate and tricalcium aluminate to a maximum percentage of 58 and the maximum alkalies to 0.60 percent. /Author/
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- Sponsored by DOT, Federal Highway Administration.
Bangor, ME USA 04402
- Edgecomb Jr, W C
- Publication Date: 1977-7
- Features: Figures; References; Tables;
- Pagination: 31 p.
- TRT Terms: Alkali; Chemical analysis; Hydration; Portland cement; Specifications; Strength of materials; Thaw; Tricalcium aluminate; Tricalcium silicate; Volume changes
- Uncontrolled Terms: Spring breakup
- Old TRIS Terms: Alkalies; Physical tests
- Subject Areas: Highways; Materials;
- Accession Number: 00173901
- Record Type: Publication
- ISBN: FHWA-ME
- Report/Paper Numbers: FHWA ME TP 77-14 Final Rpt.
- Contract Numbers: 58541
- Files: TRIS, STATEDOT
- Created Date: May 31 1978 12:00AM