Title: A Look Back at 1974 Type K Cements
Author(s): George C Hoff
Publication: Symposium Paper
Appears on pages(s): 1-16
Keywords: Air content, compressive strength, drying shrinkage, restrained expansion, shrinkage compensating cements, slump tests, specifications, Type K expansive cement, X-ray diffraction.
Samples of Type K shrinkage-compensating cement from all 17 mills producing that cement in 1974 were obtained and evaluated for compliance with the specification that was proposed at that time for these types of cements. The cements were also evaluated for specific gravity, fineness, heat of hydration, and expansion and drying shrinkage in mortars. An X-ray diffraction analysis was also made for each cement in an attempt to compare cements to note significant differences in composition or relative amounts of constituents. A standard concrete mixture was also made with all the cements and evaluated for air content, slump, compressive strength, expansion, and drying shrinkage. The results from these evaluations are revisited. The application of the 1974 proposed
specification called attention to several short-comings in that specification.