CONCRETE MIX Russian patent published in 2003 - IPC

FIELD: manufacture of building materials. SUBSTANCE: concrete mix for manufacturing high- quality concretes in fabrication of ferroconcrete items for underground tunnel construction and hydroengineering structures includes, wt +ACU-: as binding component, low-aluminate additive-free Portland cement M500, 17.97-18,23+ADs- broken granite fraction 5-10 mm, 17.97-18.24, and 10- 29 mm, 29.79-31.00+ADs- sand, 28.69-30.49+ADs- superplasticizer C-3, 0.076-0.136+ADs- mineral component (hermetic), 0.76-1.36+ADs- and water, the balance. Portland cement contains tricalcium aluminate in amount 4-7+ACU- of the weight of binder. Sand is, more particularly, river sand with fineness modulus 2-3. Ratio tricalcium aluminate (in Portland cement)/superplasticizer/hermetic is 10: 1: 10. EFFECT: intensified concrete strength growth in early stage and reduced expenses. 2 tbl