A kind of cement accelerator and preparation method thereof
A technology of early strength agent and cement, which is applied in the field of cement early strength agent and its preparation, to achieve the effect of being conducive to sustainable development and saving resources
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Embodiment 1
[0025] Put 351g of calcium carbide slag, 310g of bauxite and 339g of desulfurized gypsum into a planetary mill, add 420g of water, and grind for 5 hours. After taking it out, pour the slurry into a mold, and demould after molding to obtain a block sample;
[0026] Put the above sample in a digital display constant temperature stirring circulation curing box that has been heated to a set temperature of 95°C, take it out and cool it after constant temperature curing for 15 hours;
[0027] After the cooled block sample is crushed, it is placed in a high-temperature furnace and calcined at 1000°C for 60 minutes. After taking it out, it is rapidly cooled and ground by a ball mill until the specific surface area is 390m 2 / kg to get cement early strength agent. The obtained cement accelerator, after testing, contains anhydrous calcium sulfoaluminate and monocalcium aluminate;
[0028] Add 3% of the above-mentioned early strength agent to P·I Portland cement (42.5), the initial sett...
Embodiment 2
[0030] Put 467g steel slag, 255g bauxite and 278g desulfurized gypsum into a planetary mill, add 375g water, grind for 4 hours, take it out, pour the slurry into the mold, demould after molding, and obtain a block sample;
[0031] Put the above sample in a digital display constant temperature stirring circulation curing box that has been heated to a set temperature of 85°C, take it out and cool it after constant temperature curing for 21 hours;
[0032] After the cooled block sample is crushed, it is placed in a high-temperature furnace and calcined at 860°C for 100 minutes. After taking it out, it is rapidly cooled and ground by a ball mill until the specific surface area is 370m 2 / kg to get cement early strength agent. The obtained cement accelerator, after testing, contains anhydrous calcium sulfoaluminate and monocalcium aluminate;
[0033] Add 5% of the above-mentioned early strength agent to P·I Portland cement (42.5), the initial setting time is 130min, and the streng...
Embodiment 3
[0035] Put 413g of sugar filter mud, 234g of bauxite and 353g of phosphogypsum into a planetary mill, add 335g of water, and grind for 7 hours. After taking it out, pour the slurry into a mold, and demould after molding to obtain a block sample ;
[0036] Put the above sample in a digital display constant temperature stirring circulation curing box that has been heated to a set temperature of 75°C, take it out and cool it after constant temperature curing for 18 hours;
[0037] After the cooled block sample is crushed, it is placed in a high-temperature furnace and calcined at 920°C for 80 minutes. After taking it out, it is rapidly cooled and ground by a ball mill until the specific surface area is 350m 2 / kg to get cement early strength agent. The obtained cement accelerator, after testing, contains anhydrous calcium sulfoaluminate and monocalcium aluminate;
[0038] Add 4% of the above-mentioned early strength agent to P·I Portland cement (42.5), the initial setting time ...
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