CN113480274A - Low-shrinkage low-viscosity ultrahigh-strength concrete and preparation method thereof - Google Patents
Low-shrinkage low-viscosity ultrahigh-strength concrete and preparation method thereof Download PDFInfo
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- CN113480274A CN113480274A CN202110955010.0A CN202110955010A CN113480274A CN 113480274 A CN113480274 A CN 113480274A CN 202110955010 A CN202110955010 A CN 202110955010A CN 113480274 A CN113480274 A CN 113480274A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a low-shrinkage low-viscosity ultrahigh-strength concrete and a preparation method thereof; relates to the technical field of concrete production, and is prepared from the following components in parts by weight: portland cement, coarse aggregate, fine aggregate, silica fume, a water reducing agent, fly ash, polypropylene fiber, a lithium silicate and sodium silicate composite aqueous solution, ceramic powder, glass beads and asphalt; the concrete material prepared by the invention has ultrahigh strength, particularly greatly improved compressive strength, greatly increased application field, and can obviously improve the comprehensive performance of concrete through the synergistic promotion effect of all components, better fluidity and higher pumpability.
Description
Technical Field
The invention belongs to the technical field of concrete production, and particularly relates to low-shrinkage low-viscosity ultrahigh-strength concrete and a preparation method thereof.
Background
With the development of society and the continuous progress of science and technology, the living space of people is continuously expanded, the intensive use requirement of land is more and more strict, the quantity of modern buildings is continuously increased, the building height is gradually refreshed and recorded, high-rise buildings are visible everywhere in cities, the super high-rise buildings are also rapidly developed, and the accompanying high-strength materials are also widely applied.
The invention discloses a low-shrinkage low-viscosity ultrahigh-strength concrete in the prior art with application number CN 109400021A, which comprises the following raw materials in percentage by weight: 1-5% of cement, 1-5% of microbeads, 2-4% of mineral powder, 5-13% of machine-made sand, 15-20% of a water reducing agent, 8-10% of broken stone and 5-7% of water, and the product prepared by the method can simultaneously solve the problems of shrinkage cracking of ultra-high-strength concrete and pumping difficulty caused by overlarge viscosity.
Disclosure of Invention
The invention aims to provide low-shrinkage low-viscosity ultrahigh-strength concrete and a preparation method thereof, so as to solve the defects in the prior art.
The technical scheme adopted by the invention is as follows:
the low-shrinkage low-viscosity ultrahigh-strength concrete is prepared from the following components in parts by weight: 100-116 silicate cement, 550-580 coarse aggregate, 730-880 fine aggregate, 111-115 silica fume, 10-15 water reducing agent, 50-75 fly ash, 14-20 polypropylene fiber, 23-28 lithium silicate and sodium silicate composite aqueous solution, 10-15 ceramic powder, 8-12 glass microsphere and 10-20 asphalt.
As a further technical scheme: the average particle size of the coarse aggregate is 2 mm.
As a further technical scheme: the average particle size of the fine aggregate is 0.4 mm.
As a further technical scheme: the preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
As a further technical scheme: the liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
As a further technical scheme: the lithium hydroxide and sodium hydroxide composite solution contains 0.85% of lithium hydroxide by mass and 1.2% of sodium hydroxide by mass.
As a further technical scheme: the water reducing agent is a naphthalene-based high-efficiency water reducing agent.
As a further technical scheme: the bulk density of the fly ash is 1025kg/m3The laser granularity parameter D50 is less than or equal to 2.2 mu m, the water demand ratio of the sand is less than or equal to 90 percent, the loss on ignition is less than or equal to 1 percent, and the sand is activated for 28 daysThe sex index is more than or equal to 100 percent.
As a further technical scheme: the ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
A preparation method of low-shrinkage low-viscosity ultrahigh-strength concrete comprises the following steps:
(1) weighing portland cement, coarse aggregate, fine aggregate, silica fume, a water reducing agent, fly ash, polypropylene fiber, a lithium silicate and sodium silicate composite aqueous solution, ceramic powder, glass beads and asphalt according to parts by weight;
(2) firstly, sequentially adding portland cement, coarse aggregate and fine aggregate into a stirrer, and uniformly stirring and mixing, wherein the stirring speed is 300r/min, and the stirring time is 40min, so as to obtain a first mixture;
(3) sequentially adding silica fume, a water reducing agent, fly ash, polypropylene fiber, ceramic powder and glass beads into the first mixture, and continuously stirring for 30min at the stirring speed of 400r/min to obtain a second stirred material;
(4) adding a water reducing agent, a lithium silicate and sodium silicate composite aqueous solution and asphalt into the second stirred material, and stirring at the rotating speed of 500r/min for 40min to obtain a third stirred material;
(5) and adding water into the third stirred material according to the water-cement ratio of 0.48, and stirring for 4 hours at 50 ℃ to obtain concrete slurry.
The concrete prepared by the invention has excellent high strength and high durability, and the self weight of a building can be greatly reduced by using the concrete prepared by the invention, so that the height of the building in the same basic design is improved; the sectional area of the structural member of the beam plate column under the same bearing requirement condition is reduced, so that the use amount of concrete in unit building area is reduced, the use space in the limited building area is correspondingly increased, a large amount of concrete and steel are saved, and the service life of a building can be greatly prolonged due to the high durability of the concrete prepared by the method.
According to the invention, the performance of the concrete material can be obviously improved by introducing the lithium silicate and sodium silicate composite aqueous solution, and the introduction of the lithium silicate and sodium silicate composite aqueous solution can block capillary pores in the concrete material by precipitated silicic acid gel during hardening, so that the pore structure of the concrete material is improved; simultaneously, due to the hydration products Ca (OH) of the lithium silicate and sodium silicate composite aqueous solution and the cement in the concrete2The reaction can generate hydraulic calcium silicate colloid to fill the pores of the concrete material so as to greatly improve the compactness of the concrete material, thereby obviously improving the compressive strength of the concrete material, simultaneously, the lithium silicate and sodium silicate composite aqueous solution and the silica fume have obvious synergistic promotion effect, after being introduced into concrete, the mortar can react with hydration products in portland cement for the second time, further improve the internal void structure of the concrete material, reduce the porosity and the generation of microcracks, however, the silica fume is introduced independently, but can directly adsorb a large amount of water to wrap the surface of the silica fume, so that the hydration effect of the cement paste is reduced, therefore, the defect is reduced by introducing the lithium silicate and the sodium silicate composite aqueous solution for synergy, the concrete fluidity can also be improved initially by introducing a lithium silicate and sodium silicate composite aqueous solution.
By introducing the polypropylene fibers and combining the synergistic promotion effect of the cementing material, the invention can greatly improve the anti-shrinkage performance of the concrete, improve the anti-cracking performance of the concrete, greatly reduce the risk of shrinkage cracking and greatly improve the performance of the concrete.
Advantageous effects
The invention provides low-shrinkage low-viscosity ultrahigh-strength concrete and a preparation method thereof.
Detailed Description
The low-shrinkage low-viscosity ultrahigh-strength concrete is prepared from the following components in parts by weight: 100-116 silicate cement, 550-580 coarse aggregate, 730-880 fine aggregate, 111-115 silica fume, 10-15 water reducing agent, 50-75 fly ash, 14-20 polypropylene fiber, 23-28 lithium silicate and sodium silicate composite aqueous solution, 10-15 ceramic powder, 8-12 glass microsphere and 10-20 asphalt.
The specific surface area of the portland cement is 300m2The initial setting time is 50min, and the final setting time is 400 min;
glass beads: chemical components: SiO 22>67％,CaO>8.0％，MgO>2.5％Na2O<14％,Al2O30.5-2.0％，Fe2O3>0.15, the other 2.0%;
specific gravity: 2.4-2.6 g/cc;
appearance: bright, clean, round, transparent and impurity-free glass;
the rounding rate is as follows: more than or equal to 85 percent;
the asphalt is 10# asphalt.
As a further technical scheme: the average particle size of the coarse aggregate is 2 mm.
As a further technical scheme: the average particle size of the fine aggregate is 0.4 mm.
As a further technical scheme: the preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
As a further technical scheme: the liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
As a further technical scheme: the lithium hydroxide and sodium hydroxide composite solution contains 0.85% of lithium hydroxide by mass and 1.2% of sodium hydroxide by mass.
As a further technical scheme: the water reducing agent is a naphthalene-based high-efficiency water reducing agent.
As a further technical scheme: the bulk density of the fly ash is 1025kg/m3The laser granularity parameter D50 is less than or equal to 2.2 mu m, the water demand ratio of the sand is less than or equal to 90 percent, the loss on ignition is less than or equal to 1 percent, and the 28D activity index is more than or equal to 100 percent.
As a further technical scheme: the ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
A preparation method of low-shrinkage low-viscosity ultrahigh-strength concrete comprises the following steps:
(1) weighing portland cement, coarse aggregate, fine aggregate, silica fume, a water reducing agent, fly ash, polypropylene fiber, a lithium silicate and sodium silicate composite aqueous solution, ceramic powder, glass beads and asphalt according to parts by weight;
(2) firstly, sequentially adding portland cement, coarse aggregate and fine aggregate into a stirrer, and uniformly stirring and mixing, wherein the stirring speed is 300r/min, and the stirring time is 40min, so as to obtain a first mixture;
(3) sequentially adding silica fume, a water reducing agent, fly ash, polypropylene fiber, ceramic powder and glass beads into the first mixture, and continuously stirring for 30min at the stirring speed of 400r/min to obtain a second stirred material;
(4) adding a water reducing agent, a lithium silicate and sodium silicate composite aqueous solution and asphalt into the second stirred material, and stirring at the rotating speed of 500r/min for 40min to obtain a third stirred material;
(5) and adding water into the third stirred material according to the water-cement ratio of 0.48, and stirring for 4 hours at 50 ℃ to obtain concrete slurry.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The low-shrinkage low-viscosity ultrahigh-strength concrete is prepared from the following components in parts by weight: the concrete comprises portland cement 108, coarse aggregate 570, fine aggregate 790, silica fume 113, a water reducing agent 12, fly ash 58, polypropylene fibers 16, a lithium silicate and sodium silicate composite aqueous solution 24, ceramic powder 14, glass beads 11 and asphalt 15.
The coarse aggregate has an average particle size of 2 mm.
The average particle size of the fine aggregate was 0.4 mm.
The preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
The liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
The lithium hydroxide and sodium hydroxide composite solution contains 0.85% of lithium hydroxide and 1.2% of sodium hydroxide by weight.
The water reducing agent is a naphthalene high-efficiency water reducing agent.
The bulk density of the fly ash is 1025kg/m3The laser granularity parameter D50 is less than or equal to 2.2 mu m, the water demand ratio of the sand is less than or equal to 90 percent, the loss on ignition is less than or equal to 1 percent, and the 28D activity index is more than or equal to 100 percent.
The ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
Example 2
The low-shrinkage low-viscosity ultrahigh-strength concrete is prepared from the following components in parts by weight: 100 parts of portland cement, 550 parts of coarse aggregate, 730 parts of fine aggregate, 111 parts of silica fume, 10 parts of a water reducing agent, 50 parts of fly ash, 14 parts of polypropylene fiber, 23 parts of a lithium silicate and sodium silicate composite aqueous solution, 10 parts of ceramic powder, 8 parts of glass beads and 10 parts of asphalt.
The coarse aggregate has an average particle size of 2 mm.
The average particle size of the fine aggregate was 0.4 mm.
The preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
The liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
The lithium hydroxide and sodium hydroxide composite solution contains 0.85% of lithium hydroxide and 1.2% of sodium hydroxide by weight.
The water reducing agent is a naphthalene high-efficiency water reducing agent.
The bulk density of the fly ash is 1025kg/m3The laser granularity parameter D50 is less than or equal to 2.2 mu m, the water demand ratio of the sand is less than or equal to 90 percent, the loss on ignition is less than or equal to 1 percent, and the 28D activity index is more than or equal to 100 percent.
The ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
Example 3
The low-shrinkage low-viscosity ultrahigh-strength concrete is prepared from the following components in parts by weight: portland cement 116, coarse aggregate 580, fine aggregate 880, silica fume 115, water reducing agent 15, fly ash 75, polypropylene fiber 20, lithium silicate and sodium silicate composite aqueous solution 28, ceramic powder 15, glass beads 12 and asphalt 20.
The coarse aggregate has an average particle size of 2 mm.
The average particle size of the fine aggregate was 0.4 mm.
The preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
The liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
The lithium hydroxide and sodium hydroxide composite solution contains 0.85% of lithium hydroxide and 1.2% of sodium hydroxide by weight.
The water reducing agent is a naphthalene high-efficiency water reducing agent.
The bulk density of the fly ash is 1025kg/m3The laser granularity parameter D50 is less than or equal to 2.2 mu m, the water demand ratio of the sand is less than or equal to 90 percent, the loss on ignition is less than or equal to 1 percent, and the 28D activity index is more than or equal to 100 percent.
The ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
Example 4
The low-shrinkage low-viscosity ultrahigh-strength concrete is prepared from the following components in parts by weight: 104 parts of portland cement, 570 parts of coarse aggregate, 880 parts of fine aggregate, 111 parts of silica fume, 10 parts of water reducing agent, 75 parts of fly ash, 14 parts of polypropylene fiber, 28 parts of lithium silicate and sodium silicate composite aqueous solution, 15 parts of ceramic powder, 8 parts of glass beads and 20 parts of asphalt.
The coarse aggregate has an average particle size of 2 mm.
The average particle size of the fine aggregate was 0.4 mm.
The preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
The liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
The lithium hydroxide and sodium hydroxide composite solution contains 0.85% of lithium hydroxide and 1.2% of sodium hydroxide by weight.
The water reducing agent is a naphthalene high-efficiency water reducing agent.
The bulk density of the fly ash is 1025kg/m3The laser granularity parameter D50 is less than or equal to 2.2 mu m, the water demand ratio of the sand is less than or equal to 90 percent, the loss on ignition is less than or equal to 1 percent, and the 28D activity index is more than or equal to 100 percent.
The ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
Example 5
The low-shrinkage low-viscosity ultrahigh-strength concrete is prepared from the following components in parts by weight: portland cement 112, coarse aggregate 560, fine aggregate 760, silica fume 113, water reducing agent 11, fly ash 50-75, polypropylene fiber 14-20, lithium silicate and sodium silicate composite aqueous solution 24, ceramic powder 15, glass beads 12 and asphalt 18.
The coarse aggregate has an average particle size of 2 mm.
The average particle size of the fine aggregate was 0.4 mm.
The preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
The liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
The lithium hydroxide and sodium hydroxide composite solution contains 0.85% of lithium hydroxide and 1.2% of sodium hydroxide by weight.
The water reducing agent is a naphthalene high-efficiency water reducing agent.
The bulk density of the fly ash is 1025kg/m3The laser granularity parameter D50 is less than or equal to 2.2 mu m, the water demand ratio of the sand is less than or equal to 90 percent, the loss on ignition is less than or equal to 1 percent, and the 28D activity index is more than or equal to 100 percent.
The ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
Example 6
The low-shrinkage low-viscosity ultrahigh-strength concrete is prepared from the following components in parts by weight: portland cement 102, coarse aggregate 555, fine aggregate 730, silica fume 111, water reducing agent 11, fly ash 65, polypropylene fiber 14-20, lithium silicate and sodium silicate composite aqueous solution 25, ceramic powder 14, glass beads 9 and asphalt 12.
The coarse aggregate has an average particle size of 2 mm.
The average particle size of the fine aggregate was 0.4 mm.
The preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
The liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
The lithium hydroxide and sodium hydroxide composite solution contains 0.85% of lithium hydroxide and 1.2% of sodium hydroxide by weight.
The water reducing agent is a naphthalene high-efficiency water reducing agent.
The bulk density of the fly ash is 1025kg/m3The laser granularity parameter D50 is less than or equal to 2.2 mu m, the water demand ratio of the sand is less than or equal to 90 percent, the loss on ignition is less than or equal to 1 percent, and the 28D activity index is more than or equal to 100 percent.
The ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
Test of
The compressive strength test is carried out on a concrete test piece for 56d according to GB/T50081-2019 test method Standard for physical and mechanical Properties of concrete:
TABLE 1
Comparative example 1: the difference from the embodiment 1 is that the lithium silicate and sodium silicate composite aqueous solution is not added;
comparative example 2: the difference from the embodiment 1 is that the lithium silicate and sodium silicate composite water solution is replaced by the lithium silicate water solution;
comparative example 3: the difference from the embodiment 1 is that the lithium silicate and sodium silicate composite water solution is replaced by a sodium silicate water solution;
comparative example 4: the difference from example 1 is that no silica fume is added;
as can be seen from table 1, by introducing the lithium silicate and sodium silicate composite aqueous solution, the performance of the concrete can be significantly improved, the compressive strength of the concrete is greatly improved, and the improvement effect of the sodium silicate aqueous solution or the lithium silicate aqueous solution is limited, so that the lithium silicate and sodium silicate composite aqueous solution has an obvious synergistic promotion effect.
Slump test
Slump detection and comparison are carried out on each group of the embodiment;
TABLE 2
| Slump mm | |
| Example 1 | 212 |
| Example 2 | 215 |
| Example 3 | 212 |
| Example 4 | 213 |
| Example 5 | 215 |
| Example 6 | 213 |
As can be seen from Table 2, the present invention has good slump and exhibits very good pumpability.
Detection test of concrete T50 arrival time:
the arrival time of the concrete T50 of the examples and the comparative example is detected;
TABLE 3
Comparative example 1: the difference from the embodiment 1 is that the lithium silicate and sodium silicate composite aqueous solution is not added;
as can be seen from Table 3, the T50 arrival time of the concrete prepared by the invention is greatly reduced, and the concrete shows lower viscosity and greatly increased fluidity.
Testing crack resistance, pouring concrete of the embodiment, and comparing crack resistance of each group by pouring a 50X 100X 1500 strip of moisture-preserving curing for 7d in the open air under the same condition;
TABLE 4
| Crack resistance (28d) | |
| Example 1 | Without cracks |
| Example 2 | Without cracks |
| Example 3 | Without cracks |
| Example 4 | Without cracks |
| Example 5 | Without cracks |
| Example 6 | Without cracks |
As can be seen from Table 4, the concrete prepared by the present invention has excellent crack resistance, which is due to the lower shrinkage of the concrete, so that the cracking phenomenon of the concrete is greatly reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (10)
1. The low-shrinkage low-viscosity ultrahigh-strength concrete is characterized by being prepared from the following components in parts by weight: 100-116 silicate cement, 550-580 coarse aggregate, 730-880 fine aggregate, 111-115 silica fume, 10-15 water reducing agent, 50-75 fly ash, 14-20 polypropylene fiber, 23-28 lithium silicate and sodium silicate composite aqueous solution, 10-15 ceramic powder, 8-12 glass microsphere and 10-20 asphalt.
2. The low shrinkage, low viscosity ultra-high strength concrete according to claim 1, wherein: the average particle size of the coarse aggregate is 2 mm.
3. The low shrinkage, low viscosity ultra-high strength concrete according to claim 1, wherein: the average particle size of the fine aggregate is 0.4 mm.
4. The low shrinkage, low viscosity ultra-high strength concrete according to claim 1, wherein: the preparation method of the lithium silicate and sodium silicate composite aqueous solution comprises the following steps:
(1) mixing metal silicon powder, lithium hydroxide and sodium hydroxide composite solution, adding the mixture into a reaction kettle, and then pre-stirring for 30min to obtain pre-reaction liquid;
(2) heating the pre-reaction liquid to 88 ℃, keeping the temperature, stirring and reacting for 2 hours, then stopping heating, continuing stirring for 30 minutes, and then performing vacuum filtration by adopting a circulating water type vacuum pump to obtain the lithium silicate and sodium silicate composite aqueous solution.
5. The low shrinkage low viscosity ultra-high strength concrete according to claim 4, wherein: the liquid-solid ratio of the lithium hydroxide and sodium hydroxide composite solution to the metal silicon powder is 22.
6. A low shrinkage low viscosity ultra-high strength concrete according to claim 4 or 5, wherein: the mass fraction of lithium hydroxide in the lithium hydroxide and sodium hydroxide composite solution is 0.85%;
the mass fraction of sodium hydroxide is 1.2%.
7. The low shrinkage, low viscosity ultra-high strength concrete according to claim 1, wherein: the water reducing agent is a naphthalene-based high-efficiency water reducing agent.
8. The low shrinkage, low viscosity ultra-high strength concrete according to claim 1, wherein: the bulk density of the fly ash is 1025kg/m3；
The laser granularity parameter D50 is less than or equal to 2.2 mu m;
the water demand ratio of the mortar is less than or equal to 90 percent;
the ignition loss is less than or equal to 1 percent;
the 28d activity index is more than or equal to 100 percent.
9. The low shrinkage, low viscosity ultra-high strength concrete according to claim 1, wherein: the ceramic powder is obtained by crushing and grinding waste ceramics, and specifically comprises the following components:
washing waste ceramics with water, drying, washing with clear water for 30min, and drying at 80 deg.C for 30 min;
primarily crushing the dried waste ceramic, and sieving the crushed ceramic with a 100-mesh sieve to obtain primarily crushed material;
mixing the obtained preliminary crushed material with a grinding aid, then adding the mixture into a grinder for grinding, drying, and recovering the grinding aid to obtain ceramic powder;
the grinding aid adopts glycerol;
mixing the glycerol and the preliminary crushed material in a mass ratio of 1: 2;
the granularity of the ceramic powder is 1000 meshes.
10. The method for preparing the low-shrinkage low-viscosity ultra-high-strength concrete according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
(1) weighing portland cement, coarse aggregate, fine aggregate, silica fume, a water reducing agent, fly ash, polypropylene fiber, a lithium silicate and sodium silicate composite aqueous solution, ceramic powder, glass beads and asphalt according to parts by weight;
(2) firstly, sequentially adding portland cement, coarse aggregate and fine aggregate into a stirrer, and uniformly stirring and mixing, wherein the stirring speed is 300r/min, and the stirring time is 40min, so as to obtain a first mixture;
(3) sequentially adding silica fume, a water reducing agent, fly ash, polypropylene fiber, ceramic powder and glass beads into the first mixture, and continuously stirring for 30min at the stirring speed of 400r/min to obtain a second stirred material;
(4) adding a water reducing agent, a lithium silicate and sodium silicate composite aqueous solution and asphalt into the second stirred material, and stirring at the rotating speed of 500r/min for 40min to obtain a third stirred material;
(5) and adding water into the third stirred material according to the water-cement ratio of 0.48, and stirring for 4 hours at 50 ℃ to obtain concrete slurry.
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Application publication date: 20211008 |