THE MEASUREMENT OF THE HEAT OF HYDRATION OF CEMENT
The heat of solution method is briefly described, and the results obtained in five test cycles are detailed. This method is used to calculate the heat of hydration by distinguishing between the heat of solution in an acid mixture, of anhydrous cement and hydrated cement kept for a period of time at a constant temperature. The testing is usually carried out on samples kept at the same temperature and during the same periods of time as for strength tests but, as with the latter, it can be applied to samples kept under different conditions. The first test program consisted of the measurement of the heat of hydration at 3.7 28 days for portland cement and at 28 days for pozzolana cement. The second test series carried out on portland cement, pozzolana and a blast furnace cement, included the measurement of the CaO (calcium oxide) and loss on ignition. The third cycle aimed at obtaining consistency in the basic measurement of the heat of solution of anhydrous and hydrated samples and establishing the most suitable method for calculating the corrected temperature rise. The fourth series of tests was designed to control the calibration of the calorimeter and to apply the procedure which has given satisfactory results for portland cement, to pozzolana and blastfurnace cements. The good consistency obtained for the heat of solution of anhydrous samples confirmed that the method did not involve operational difficulties when applied to cements with slow solution rates. The fifth cycle of tests evaluated the method with special reference to blastfurnace cement. A summary of standard deviations from the general average values obtained in the test cycles is tabulated. The results indicate that for all types of cement and all ages under consideration, the final standard deviations of the values obtained in different laboratories are less than +/- 2 cal/g.
- A report on co-operative tests leading to the development of the Cembureau International Reference Method.
European Cement BureauParis, France
- Publication Date: 1975-9
- Features: Tables;
- Pagination: 12 p.
- TRT Terms: Blast furnaces; Calcium compounds; Calibration; Cement; Deviation (Statistics); Heat of hydration; Hydrates; Measurement; Portland cement; Pozzolan; Temperature; Testing
- Old TRIS Terms: Anhydrites; Deviation
- Subject Areas: Highways; Materials;
- Accession Number: 00128802
- Record Type: Publication
- Files: TRIS
- Created Date: Apr 21 1976 12:00AM