Investigation of Cement-Replacement Materials. Report 7. Comparative Tests of Compressive Strength of Mortars Containing Pozzolans.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
Pagination or Media Count:
The requirement that specimens of a portland cement-pozzolan mortar stored at 100F develop a compressive strength at 28 days age of at least 75 per cent of that of a mortar without pozzolan has been included in Corps of Engineers specifications for fly ash. This requirement has the principal disadvantage of requiring more than a month to obtain the test results. A test using a lime-pozzolan mortar tested at 7 days age after storage at 130F was devised and tried out at two laboratories. The results obtained with it were compared with results from the cement-pozzolan test. This comparison indicated that lime-pozzolan mortars should develop a compressive strength of at least 900 psi in order to be considered as also complying with the 75 per cent limit. Various details of the testing procedure appear to require refinement in order to minimize differences in results between laboratories. Author
- Construction Equipment, Materials and Supplies