presents research results, test methods, and performance criteria related to the structural and environmental functions and the durability and safety characteristics of building elements and systems. studies of sulfate expansion, heat of hydration, autoclave expansion, compressive strength after normal and steam curing, shrinkage, absorption, freeze-thaw durability, as well as the effect of outdoor exposure on concrete specimens.

No abstract

A comparison of compressive strength tests of six portland cements shows that the proposed ISO procedures gave results from 25 to 95 per cent higher than ASTM C 109, depending upon strength level, test age, and cement fineness. The testing sand is seen as the major problem in developing a truly international standard for cement strength, and it is concluded that the selection of equivalent sands is complicated by the prescribed mechanical compaction, which causes forced bleeding. ISO tests using Ottawa-type, round-grain sands are described.