Cement-free low-carbon concrete and preparation method thereof
A concrete, cement-free technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of not taking into account the use, low utilization rate of coal-to-liquid crude residue, etc., to reduce production costs, Improved effect of solid waste recycling
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[0034] The application also provides the preparation method of above-mentioned cementless low-carbon concrete, comprising the following steps:
[0035] According to the weight ratio, coal gasification coarse slag, steel slag, gypsum and lime kiln dust are mixed to obtain cementitious material;
[0036] The cementitious material, the fine aggregate, the coarse aggregate, water and the water reducer are mixed according to the weight ratio, cured, and the concrete is obtained.
[0037] In the present application, the preparation method of the gelling material specifically includes the following two methods:
[0038] 1) Drying, crushing, iron removal, and grinding the steel slag until reaching the above particle size or specific surface area range;
[0039] 2) drying and grinding the coal gasification coarse slag until it reaches the above-mentioned range of particle size or specific surface area;
[0040] 3) Drying and breaking up the gypsum until the above particle size or spe...
Embodiment 1
[0054] 1) Dry the steel slag, crush it, remove iron, and grind it until the particle size D90 of the steel slag is 35μm or the specific surface area is 450m 2 / kg; and need to go through iron removal, the iron content after iron removal is 3.0%;
[0055] 2) Dry and grind the coal gasification coarse slag until the particle size D90 of the coal gasification coarse slag is 25 μm or the specific surface area is 550 m 2 / kg;
[0056] 3) Dry and disperse the gypsum until the particle size D90 of the gypsum is 35 μm or the specific surface area is 450 m 2 / kg;
[0057] 4) Mix the materials mentioned above according to the following proportions: 30 parts of coal gasification coarse slag, 40 parts of steel slag, 15 parts of gypsum, and 15 parts of lime kiln dust collection, to obtain the cementitious material;
[0058] 5) Take the cementitious material, fine aggregate, coarse aggregate, water and water reducer according to the weight in Table 1, mix the above raw materials evenly t...
Embodiment 2
[0063] 1) Drying, crushing and iron removal of steel slag;
[0064] 2) Coal gasification coarse slag is dried;
[0065] 3) Gypsum is dried and dispersed;
[0066] 4) Mix the materials mentioned above according to the following proportions: 40 parts of coal gasification coarse slag, 35 parts of steel slag, 15 parts of gypsum, 10 parts of lime kiln dust collection, mix and grind until the specific surface area is 550m 2 / kg; the particle size meets the following conditions: 0 < particle size ≤ 80 μm; 0.045mm sieved to 1.0%, and then mixed with lime kiln dust according to the proportion to obtain the cementitious material;
[0067] 5) Take the cementitious material, fine aggregate, coarse aggregate, water and water reducer according to the weight in Table 2, mix the above raw materials evenly to obtain the concrete, preferably put the concrete into the prefabricated mold, Store at 45°C until the specified age;
[0068] Table 2 Concrete mix ratio data table (amount of concrete ...
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