Consistent Inconsistencies in the Consistency of Concrete
C. H. Scholer
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Concrete segregation, usually considered objection able, is to some extent necessary and desirable as in placing and finishing operations at surfaces and around reinforcing. Concrete should be designed accordingly. Bleeding of concrete, long recognized as objectionable, has its uses. Construction practice depends on free water for lubrication. Arbitrary re-duction of bleeding may lead to serious errors. Den- sity of concrete is a common measure of its quality. Concrete technicians know that the densest concrete is not obtained with rich mixtures yet density is commonly considered a result of rich mixtures. The use of cement admixtures to promote workability actually reduces density by incorporating air, but nevertheless improves durability.