Patent ID: 8048219

Claim:
A method of placing a light weighted concrete compositions comprising: a) combining ingredients comprising 3-40 volume percent cement, 5-50 volume percent fine aggregate, 1.5-50 volume percent coarse aggregate, and 10-22 volume percent water to form a concrete mixture; b) during or after (a), adding 5-40 volume percent of prepuff particles to the concrete mixture to form a light weighted concrete composition; and c) pumping the light weighted concrete composition to a point higher in elevation than the delivery point of the concrete to place the concrete; wherein the light weighted concrete composition contains less than 30 volume percent of other light weighting aggregates; wherein the prepuff particles have an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.02 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3; wherein the slump value of the placed light weighted concrete composition measured according to ASTM C 143 is greater than 1 inch; and wherein the light weighted concrete composition has a density of from about 40 to about 135 lb./ft 3 .