Coated-fine-aggregate, concrete composition and method

摘要

A concrete composition and method include a portion of fine aggregate bearing a coating of a polymer, which may be a continuous coating layer or a layer of powdered, discrete particles embedded in a binder. The polymeric coating may be a super absorbent polymer (insoluble in water, but absorbing water), or another polymer such as the acrylamides, co-polymers thereof, polyacrylamides, or the like (soluble in water). The coating absorbs water, but particles are too small to form significant voids. Water is absorbed into the concrete mix in far greater proportions (e.g. w/c ratio over 0.5) improving workability, doubling workability time, and improving ultimate compressive stress (strength).

主权项

1. A composition comprising:
coarse aggregate comprising rocks of a comparatively larger size; fine aggregate comprising granules of sand having an average maximum dimension substantially smaller than the coarse aggregate; cement; and polymer coated aggregate comprising a portion of the fine aggregate having the granules individually coated with discrete, individual, and discontinuous particles of a powder comprising a water-absorbing polymer.