Super high performance concrete prepared by wet granite stone powder and preparation method thereof

Abstract

The invention discloses a super high performance concrete prepared by a wet granite stone powder and prepared from cement, fly ash microbeads, silica fume, the wet granite stone powder, a hydrogen peroxide solution, river sand, steel-imitated fibers, a superdispersion shrinkage-reducing admixture, a defoamer and water as main raw materials. The concrete workability and microstructure of concrete are controlled by the fly ash microbeads; the hydrogen peroxide solution is decomposed to release oxygen to disperse the wet granite stone powder, the wet granite stone powder and cementitious materialparticles are dispersed by dispersing groups of the superdispersion shrinkage-reducing admixture, the hydration rate and the utilization ratio of the cementitious material are effectively improved, and shrinkage of the concrete is reduced; bubbles, introduced by oxygen generated from decomposition of hydrogen peroxide and other materials, in concrete are eliminated by the defoamer, so as to ensure the mechanical properties and durability of the concrete. The UHPC prepared by the wet granite stone powder has the advantages of super high strength, toughness, excellent crack resistance and the like, meets the requirements of environmental protection and energy conservation, and has important application value.

Description

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to an ultra-high performance concrete prepared by using wet granite powder and a preparation method thereof. Background technique

[0002] Ultra-high performance concrete is widely used in cable trays, sidewalk covers, high-speed railways, subways, and bridges due to its advantages such as ultra-high strength, excellent toughness and durability, almost no penetration, and certain self-repairing functions. But there are also the following defects: 1) The amount of cement used in ultra-high performance concrete is as high as 800-1000kg / m 3 , which increases the heat of hydration and is prone to shrinkage problems; 2) The raw materials required for the preparation of ultra-high performance concrete include cement, silica fume, quartz sand, quartz powder, steel fiber and superplasticizer, etc., and the production cost is that of ordinary concrete Several times; 3) The wate...

Examples

preparation example Construction

[0039] The preparation method of described hyperdispersion shrinkage reduction admixture comprises the following steps:

[0040] 1) Pour siloxane, polyacrylamide emulsifier, water and ammonium persulfate initiator into the Erlenmeyer flask in proportion, stir and emulsify, raise the temperature to 85°C, stir regularly for 4 hours, add hydroquinone inhibitor Terminate its reaction and extract the homopolymer, volatilize and remove the solvent to obtain the oligomer; wherein the molar ratio of siloxane, emulsifier, and water is 1:0.008:0.6, and the mass ratio of siloxane and ammonium persulfate initiator is 1:0.5, the hydroquinone inhibitor is 0.005% of the monomer mass;

[0041] 2) Dissolve the oligomers obtained in step 1) in benzene, add polyacrylate, stir the reaction in a water bath at 65°C for 2 hours, remove the solvent by volatilization, and extract 3 times with dechlorinated water to remove unreacted oligomers. body, extracted with benzene at room temperature to obtain...

Embodiment 1～4

[0047] The ultra-high-performance concrete prepared from wet granite stone powder described in Examples 1 to 4 is prepared with cement, fly ash microbeads, silica fume, wet granite stone powder, hydrogen peroxide solution, river sand, imitation steel fiber, and ultra-dispersed shrinkage reduction The additive, defoamer and water are prepared as raw materials, and the preparation method includes the following steps:

[0048] 1) Weigh each raw material according to the mixing ratio in Table 1, place the weighed wet granite powder in a mixer, add hydrogen peroxide solution while stirring, and continue stirring for 3 minutes; then add part of the ultra-dispersion shrinkage reduction Admixture, continue stirring for 1 to 2 minutes to obtain fully dispersed wet granite powder, wherein the mass ratio of wet granite powder to ultra-dispersed shrinkage reducing admixture is 1:0.004;

[0049] 2) Add the weighed river sand into the mixer and mix with the dispersed wet granite powder even...

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to an ultra-high performance concrete prepared by using wet granite powder and a preparation method thereof. Background technique

[0002] Ultra-high performance concrete is widely used in cable trays, sidewalk covers, high-speed railways, subways, and bridges due to its advantages such as ultra-high strength, excellent toughness and durability, almost no penetration, and certain self-repairing functions. But there are also the following defects: 1) The amount of cement used in ultra-high performance concrete is as high as 800-1000kg / m 3 , which increases the heat of hydration and is prone to shrinkage problems; 2) The raw materials required for the preparation of ultra-high performance concrete include cement, silica fume, quartz sand, quartz powder, steel fiber and superplasticizer, etc., and the production cost is that of ordinary concrete Several times; 3) The wate...

Examples

preparation example Construction

[0039] The preparation method of described hyperdispersion shrinkage reduction admixture comprises the following steps:

[0040] 1) Pour siloxane, polyacrylamide emulsifier, water and ammonium persulfate initiator into the Erlenmeyer flask in proportion, stir and emulsify, raise the temperature to 85°C, stir regularly for 4 hours, add hydroquinone inhibitor Terminate its reaction and extract the homopolymer, volatilize and remove the solvent to obtain the oligomer; wherein the molar ratio of siloxane, emulsifier, and water is 1:0.008:0.6, and the mass ratio of siloxane and ammonium persulfate initiator is 1:0.5, the hydroquinone inhibitor is 0.005% of the monomer mass;

[0041] 2) Dissolve the oligomers obtained in step 1) in benzene, add polyacrylate, stir the reaction in a water bath at 65°C for 2 hours, remove the solvent by volatilization, and extract 3 times with dechlorinated water to remove unreacted oligomers. body, extracted with benzene at room temperature to obtain...

Embodiment 1～4

[0047] The ultra-high-performance concrete prepared from wet granite stone powder described in Examples 1 to 4 is prepared with cement, fly ash microbeads, silica fume, wet granite stone powder, hydrogen peroxide solution, river sand, imitation steel fiber, and ultra-dispersed shrinkage reduction The additive, defoamer and water are prepared as raw materials, and the preparation method includes the following steps:

[0048] 1) Weigh each raw material according to the mixing ratio in Table 1, place the weighed wet granite powder in a mixer, add hydrogen peroxide solution while stirring, and continue stirring for 3 minutes; then add part of the ultra-dispersion shrinkage reduction Admixture, continue stirring for 1 to 2 minutes to obtain fully dispersed wet granite powder, wherein the mass ratio of wet granite powder to ultra-dispersed shrinkage reducing admixture is 1:0.004;

[0049] 2) Add the weighed river sand into the mixer and mix with the dispersed wet granite powder even...

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