A kind of ultra-high performance concrete and preparation method thereof
An ultra-high-performance concrete technology, applied in the field of concrete, can solve the problems of easy cracks in concrete and increased self-shrinkage of concrete, and achieve the effects of enhancing self-repair performance, reducing self-shrinkage, and enhancing comprehensive performance
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[0036] In the preparation method of the ultra-high performance concrete of the present invention, when preparing the first slurry, when mixing Portland cement and silicon micropowder, stir at a speed of 10-20rpm for 20-30s. After adding fine foundry sand, stir at 30-50rpm for 30-50s. After adding coarse foundry sand, stir at 20-30rpm for 15-30s. After adding water, stir at a speed of 50-80 rpm for 1-2 min to prepare the first slurry. Further, when mixing Portland cement and silicon micropowder, aluminum slag ash is also added and mixed evenly. Further, when mixing Portland cement and silicon micropowder, magnesium oxide expansion agent is also added and mixed evenly.
[0037] When preparing the second slurry, the viscosity-modified powder and water are firstly mixed evenly, then the water reducer is added and mixed evenly, and then the steel fiber is added and mixed evenly. Further, when the viscosity-modified powder and water are uniformly mixed, starch is also added and m...
Embodiment 1
[0041]The ultra-high performance concrete in this example is made of the following raw materials: Portland cement 1000kg, micro silica fume 125kg, viscosity modified powder 55kg, coarse casting sand 480kg, fine casting sand 520kg, steel fiber 185kg, water reducer 20kg, water 395kg. The average particle size of the silica fume is 0.15 μm. The viscosity modifying powder is sodium carboxymethylcellulose. The particle size of coarse foundry sand is 20 / 40 mesh, and the particle size of fine foundry sand is 40 / 70 mesh. The length of the steel fiber is 32±2mm. The water reducer is a polycarboxylate water reducer.
[0042] The preparation method of the ultra-high performance concrete of the present embodiment comprises the steps:
[0043] 1) Stir and mix Portland cement and silica fume at a speed of 15rpm for 20s, then add fine casting sand, stir and mix at a speed of 30rpm for 50s, then add coarse casting sand, stir and mix at a speed of 20rpm for 20s, then add 355kg water, stir...
Embodiment 2
[0047] The ultra-high performance concrete in this example is made of the following raw materials: Portland cement 1000kg, micro silica fume 130kg, viscosity modified powder 72kg, coarse casting sand 500kg, fine casting sand 520kg, steel fiber 195kg, water reducer 28kg, aluminum ash slag 20kg, magnesium oxide expansion agent 15kg, water 405kg. The average particle size of the silica fume is 0.15 μm. The viscosity modifying powder is sodium carboxymethylcellulose. The particle size of coarse foundry sand is 20 / 40 mesh, and the particle size of fine foundry sand is 40 / 70 mesh. The length of the steel fiber is 32±2mm. The water reducer is a polycarboxylate water reducer.
[0048] The preparation method of the ultra-high performance concrete of the present embodiment comprises the steps:
[0049] 1) Stir and mix Portland cement, silica fume, aluminum slag ash, and magnesium oxide expansion agent at a speed of 10rpm for 30s, then add fine casting sand, stir and mix at a speed o...
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