HIGH-RANGE WATER REDUCER Russian patent published in 2009 - IPC C04B24/22 C04B111/20 

FIELD: chemistry; building.

SUBSTANCE: invention refers to construction materials, particularly to compositions of water reducing additives used in manufacturing concrete, mortar mixes, reinforced concrete and special concrete products, namely - to composition of high-range water reducer based on naphthalensulphonic acid and formaldehyde polycondensation products. The high-range water reducer based on neutralised naphthalensulphonic acid and formaldehyde condensation product contains, wt %: oligomers with 2-4 naphthalene rings - 10.0-28.5, oligomers with 5-9 naphthalene rings - 6.0÷11.5, oligomers containing 10 naphthalene rings and more - 60.0÷80.0. Besides specified high-range water reducer can contain in addition salts of naphthalensulphonic acid, naphthalendisulphonic acid and sodium sulphate in ratio, wt %: specified oligomers 85.00÷98.00; salts of naphthalensulphonic acid and naphthalendisulphonic acid 0.5÷5.0; sodium sulphate - the rest. Specified oligomers can contain in addition hydroxyl groups, and one hydroxyl group goes to 40÷200 naphthalene rings.

EFFECT: maintained consistency of concrete mix without loss of grade strength, as well as higher fracture strength.

3 cl, 3 tbl