| abstract |
The present invention relates to a process for the preparation of a composition comprising: Unit bonding amount of 400 to 500 kg / m 3; Unit fine aggregate amount 600 to 830 kg / m3; And a unit coarse aggregate amount of 1,000 to 1,200 kg / m < 3 >, based on 100 parts by weight of cement, 1 to 40 parts by weight of a mixed material; And 1 to 2 parts by weight of a high-performance water reducing agent, wherein the coarse aggregate has a granulation blast range of 6 to 8, and the granulated blast furnace slag is a coarse aggregate, wherein the blast-furnace slag is slaked in the air and the coarse slag granulated blast furnace slag is coarse aggregate, %, Based on 100 parts by weight of the binding material, of at least one alkali metal carbonate or bicarbonate selected from the group consisting of lithium, sodium, and potassium as the accelerator, and further comprising 1 to 1.5 parts by weight of a tartaric acid , Citric acid, gluconic acid or a salt thereof in an amount of 0.2 to 1 part by weight based on 100 parts by weight of the binding material, As the filler, at least one selected from bentonite, silica, calcium carbonate, talc, barium sulfate and aluminum hydroxide is further included in an amount of 10 to 30 parts by weight based on 100 parts by weight of the binder. |