Ultra-high performance concrete with high fiber dispersion and orientation and its preparation method
An ultra-high performance concrete technology, applied in the field of ultra-high performance concrete and its preparation, can solve the problem of no obvious improvement in the fiber distribution of ultra-high performance concrete, and achieve the effect of good work performance, strong compatibility and low viscosity
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Embodiment 1
[0045] The cementitious material of ultra-high-performance concrete with high fiber dispersion and orientation degree in this embodiment is cement and silica fume, and part of the cement is replaced by silica fume with a mass fraction of 5%, and river sand and machine-made sand are used as fine aggregates to improve accumulation. Density, liquid high-efficiency water reducer (polycarboxylate water reducer), steel fiber with a volume content of 2%. The slump spread of the fresh ultra-high performance concrete is 265mm.
[0046] The preparation method of the ultra-high performance concrete with high fiber dispersion and orientation degree of the present embodiment is as follows:
[0047] (1) Put cement, silica fume and fine aggregate into the mixer, and stir for 2 minutes at low speed;
[0048] (2) Mix water and polycarboxylate superplasticizer to obtain a mixture; add 87% of the mixture into the mixer, and stir for 3 minutes at low speed;
[0049] (3) Add the remaining mixtur...
Embodiment 2
[0055] The cementitious material of the ultra-high performance concrete with high fiber dispersion and orientation degree in this embodiment is cement and silica fume, and part of the cement is replaced by silica fume with a mass fraction of 10%, and river sand and machine-made sand are used as fine aggregates to improve accumulation. Density, liquid high-efficiency water reducer (polycarboxylate water reducer), steel fiber with a volume content of 2%. The slump spread of the fresh ultra-high performance concrete is 272mm.
[0056] The preparation method of the ultra-high performance concrete with high fiber dispersion and orientation degree of the present embodiment is as follows:
[0057] (1) Put cement, silica fume and fine aggregate into the mixer, and stir for 3 minutes at low speed;
[0058] (2) Mix water and polycarboxylate superplasticizer to obtain a mixture; add 90% of the mixture into the mixer, and stir for 4 minutes at low speed;
[0059] (3) Add the remaining m...
Embodiment 3
[0065] The cementitious material of the ultra-high performance concrete with high fiber dispersion and orientation degree in this embodiment is cement and silica fume, and part of the cement is replaced by silica fume with a mass fraction of 15%, and river sand and machine-made sand are used as fine aggregates to improve accumulation. Density, liquid high-efficiency water reducer (polycarboxylate water reducer), steel fiber with a volume content of 2%. The slump spread of the fresh ultra-high performance concrete is 279mm.
[0066] The preparation method of the ultra-high performance concrete with high fiber dispersion and orientation degree in this embodiment is the same as that in Embodiment 1.
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