A method of placing a concrete compositions including a) combining 3-40 volume percent cement, 5-50 volume percent fine aggregate, 5-50 volume percent coarse aggregate, and 10-22 volume percent water; b) adding 1.5-40 volume percent of prepuff particles to form a concrete composition; and c) pumping...http://www.google.de/patents/US8048219?utm_source=gb-gplus-sharePatent US8048219 - Method of placing concrete
