Composite concrete for floor slabs and rafts

摘要

The invention is in the field of construction and can be used for constructing industrial floors and foundation slabs. The offered composite concrete mixture, comprising cement, sand-stone mixture, water, plasticizer, nano-size pozzolans, shrinkage reducing additive, and steel and/or synthetic fibers, allows the construction of thin, completely jointless without limitation of area, large composite concrete slabs, with no observable shrinkage cracks or curling.

主权项

1. A monolithic floor slab or monolithic raft slab having at least 1000 J of energy absorption, determined in accordance with the Swiss Standard SIA 162, and zero shrinkage after 150 days of hardening, the floor slab or raft slab made of composite concrete containing cement, water, sand-stone mixture, fibers, plasticizer, at least one shrinkage reducing additive chosen from a group consisting of free lime, ethylene glycol, and calcium sulfoaluminate, wherein the ingredients content in 1 m3 of said composite concrete comprises:
cement, being CEMI, CEMII or CEMIII cement type containing at least 75% of clinker:
240-360 kg; water: 110-165 kg; sand-stone mixture with particle size to 16 mm: 1700-1900 kg; plasticizer: 0.5-2% of the cement content; shrinkage reducing additive or additives added in the quantity of:
5-70 kg; steel fibers of diameter 0.75-1 mm and aspect ratio 50-70:
25-60 kg, wherein the monolithic floor slab or monolithic raft slab being fully jointless without limitation of area and the thickness of the said fully jointless monolithic floor slab or fully jointless monolithic raft slab is at least 50 mm.