Correlation of Shirnkage and Curing in Concrete Masonry Units
Harry W. Easterly, Jr.
Appears on pages(s):
Need for a specification defining maximum shrinkage in concrete masonry units has long been recognized. The present specification which limits the amount of moisture in the unit when it is laid is inadequate and cannot be enforced. This paper shows how use of the British specification which limits shrinkage rather than moisture content in the block was applied to block cured by high-pressure steam and by high-temperature steam. High-pressure steam cured blocks shrank only about half as much as those cured by high-temperature steam. The literature on high-pressure steam curing is briefly reviewed and the British standard method of measuring drying shrinkage is shown to be applicable to masonry units manufactured in this country.