| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to composition of a concrete mixture and mortar and can be used in construction when making prefrabricated concrete or reinforced concrete articles and structures. The concrete mixture contains the following, wt %: portland cement 30.83-33.94; finely ground quartz sand with silicon dioxide SiOcontent higher than 94%, in which content of fine particles with average diameter smaller than 3.9 mcm is higher than 50% 1.78-3.55, river sand with fineness modulus of 1.9 55.5-56.00, Petrolafs additive 0.28-0.42, water - the balance.EFFECT: high strength of concrete aged 12-24 hours, high bending and compression strength of concrete aged 28 days.1 ex, 1 tbl |
