A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention relates to a concrete accelerator. The concrete accelerator is prepared by mixing, by weight, 10-15 parts of fatty acid methylolamide, 8-12 parts of a water-soluble calcium salt, 3-7 parts of sodium carbonate, 5-10 parts of fly ash, 3-7 parts of blast furnace gas mud, 4-8 parts of silicon powder, 10-15 parts of aluminum oxygen chamotte powder, 6-10 parts of calcium formate, 5-10 parts of quicklime and 7-12 parts of zinc sulfate. The concrete accelerator has the following advantages: 1, the setting time is short: the initial setting time is 1-5min, the final setting time is 5-10min, and the suitable mixing amount is 3-5% of the amount of a gelling material; 2, the alkali metal content is smaller than 1%, and the accelerator is nontoxic, tasteless and irritant; 3, the fineness meets a condition that the proportion of residues on a 80[mu]m sieve is smaller than 10%; 4, the early stage strength of a sprayed concrete is high, and the 28d age compressive strength retention rate reaches 80-100%; and 5, the cohesiveness of a spray material is good, the spray material has no corrosion effect on steel bars, the one-time spraying layer is thick, the thickness of a spray arch can reach 130mm, and the thickness of a spray wall can reach 200mm or more.
The invention relates to a concrete accelerator. The concrete accelerator is prepared by mixing, by weight, 10-15 parts of fatty acid methylolamide, 8-12 parts of a water-soluble calcium salt, 3-7 parts of sodium carbonate, 5-10 parts of fly ash, 3-7 parts of blast furnace gas mud, 4-8 parts of silicon powder, 10-15 parts of aluminum oxygen chamotte powder, 6-10 parts of calcium formate, 5-10 parts of quicklime and 7-12 parts of zinc sulfate. The concrete accelerator has the following advantages: 1, the setting time is short: the initial setting time is 1-5min, the final setting time is 5-10min, and the suitable mixing amount is 3-5% of the amount of a gelling material; 2, the alkali metal content is smaller than 1%, and the accelerator is nontoxic, tasteless and irritant; 3, the fineness meets a condition that the proportion of residues on a 80[mu]m sieve is smaller than 10%; 4, the early stage strength of a sprayed concrete is high, and the 28d age compressive strength retention rate reaches 80-100%; and 5, the cohesiveness of a spray material is good, the spray material has no corrosion effect on steel bars, the one-time spraying layer is thick, the thickness of a spray arch can reach 130mm, and the thickness of a spray wall can reach 200mm or more.