| 摘要 |
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 - 6.011.5, oligomers containing 10 naphthalene rings and more - 60.080.0. Besides specified high-range water reducer can contain in addition salts of naphthalensulphonic acid, naphthalendisulphonic acid and sodium sulphate in ratio, wt %: specified oligomers 85.0098.00; salts of naphthalensulphonic acid and naphthalendisulphonic acid 0.55.0; sodium sulphate - the rest. Specified oligomers can contain in addition hydroxyl groups, and one hydroxyl group goes to 40200 naphthalene rings. ^ EFFECT: maintained consistency of concrete mix without loss of grade strength, as well as higher fracture strength. ^ 3 cl, 3 tbl |
