CN108439899B - High-strength ultra-light cement-based composite material and preparation method thereof - Google Patents
High-strength ultra-light cement-based composite material and preparation method thereof Download PDFInfo
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/40—Porous or lightweight materials
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- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
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Abstract
The invention discloses a high-strength ultralight cement-based composite material which is characterized by comprising the following components: the water-based composite material comprises a cementing material, hollow glass beads, a polycarboxylic acid high-performance water reducing agent and water, wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:1-2.5:100-200, and the volume ratio of the cementing material to the hollow glass beads is 1: 3-8; the cementing material comprises the following components in percentage by mass: 57-78% of cement, 15-25% of floating beads, 3-10% of silica fume, 1-3% of phosphogypsum and 3-5% of polyaluminium chloride, wherein the sum of the percentages of the cement, the floating beads, the silica fume, the phosphogypsum and the polyaluminium chloride is 100%. The invention adopts the combination of the cementing material and the hollow glass beads to obtain the ultra-light cement-based composite material with low density and high strength, has better effect of resisting chloride ion permeability and has better application prospect on offshore floating buildings.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a high-strength ultra-light cement-based composite material and a preparation method thereof.
Background
The ultra-light cement-based composite material has a volume weight of less than 1000kg/m3I.e. a cement-based material having a density less than that of water. The existing cement-based materials with volume weight smaller than water mainly comprise foam concrete and aerated concrete, namely, air is introduced into the concrete to form a honeycomb cavity, and the compression strength of the concrete is lower and about 5MPa due to the cavity structure, so that the concrete cannot be used in engineering load-bearing structures. The trend of adopting the hollow glass beads as components for reducing the density of the concrete is ultra-light concrete.
CN 106007599A discloses an ultra-light concrete and a preparation method thereof, the components comprise a cementing material (Portland cement, granulated blast furnace slag and silica fume), hollow glass beads, a water reducing agent, water, latex and polyvinyl alcohol fiber, and the density is 650kg/m3But the strength is too low to be used for marine building materials at 8.1-8.3 MPa.
CN 107602019A discloses an ultra-light concrete, which comprises the components of cement, floating beads, silica fume, a water reducing agent, water,Fly ash, limestone powder, free calcium oxide, polypropylene fiber or steel fiber or the combination thereof, a water reducing agent and a water reducing agent, wherein the concrete density is 1179-350-65.5MPa at 30 ℃ and 8.2-19.4MPa at 900 ℃, so that the concrete is applied to a high-temperature burst-proof building member, and the density of the concrete is higher than that of water, so that the concrete cannot be applied to marine building materials.
The concrete is corroded by chloride ions in the special offshore environment, the steel bars are corroded seriously, and the important index of resisting chloride ions and corrosion is not considered in the ultra-light concrete, so that an ultra-light composite material with low density, high strength and good chloride ion permeability and a preparation method thereof need to be developed to promote the construction of offshore floating buildings.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide an ultra-light composite material with low density, high strength and good impermeability and a preparation method thereof.
The technical scheme of the invention is as follows: the high-strength ultra-light cement-based composite material is characterized by comprising the following components: the water-based composite material comprises a cementing material, hollow glass beads, a polycarboxylic acid high-performance water reducing agent and water, wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:1-2.5:100-200, and the volume ratio of the cementing material to the hollow glass beads is 1: 3-8;
the cementing material comprises the following components in percentage by mass: 57-78% of cement, 15-25% of floating beads, 3-10% of silica fume, 1-3% of phosphogypsum and 3-5% of polyaluminium chloride, wherein the sum of the percentages of the cement, the floating beads, the silica fume, the phosphogypsum and the polyaluminium chloride is 100%. The scheme adopts the combination of the cementing material and the hollow glass microspheres, and because the cement, the floating beads, the silica fume, the phosphogypsum and the polyaluminium chloride are mutually excited and promote hydration, the generated hydration product is very compact, the strength and the chloride ion permeability resistance of the ultra-light cement-based composite material are greatly improved under the low density, and the compressive strength of the ultra-light cement-based composite material is 12.6-15.2MPa, and the density of 870 plus 970kg/m3Resistance to chloride ion permeability of 3.6X 10-12-5×10-12m2/s。
The invention aims to use the phosphogypsum to: the phosphogypsum is an ultra-fine acidic industrial solid waste, the specific surface area of the phosphogypsum is larger as the particles are finer, the contact area with water is increased, and the Ca content per se is accelerated2+And SO4 2-The dissolution rate of the gypsum is accelerated, namely the crystal nucleation rate of the ettringite is accelerated, the gypsum has a great promotion effect on the formation of the early strength of the gelled material, and the phosphogypsum is added into the ultra-light cement-based composite material to play a role in optimizing the grain composition and the effect of exciting the silica fume by sulfate. The ardealite particles are fine, so that the physical dense filling effect of the ardealite particles can be fully exerted; secondly, the silica fume in the cementing material system is subjected to hydration reaction under the alkali excitation effect provided by the silicate cement and the sulfate excitation effect of the phosphogypsum, hydration products are ettringite and C-S-H gel which are interwoven together to form a space net structure, and the surface, holes and gaps of the hardened cement slurry are filled to form a compact whole. The method is not realized by other materials, and the method is used as a mineral admixture of an ultra-light cement-based composite material, is a good way for realizing the effective utilization of the phosphogypsum, and has obvious economic benefit.
The purpose of the invention using polyaluminium chloride is that: the polyaluminium chloride is industrial water treatment agent polyaluminium chloride, and is mixed with Ca (OH)2Increased consumption rate of Ca (OH) dissolved in the pore solution2The reaction degree with the mineral powder is improved, and more hydration products are generated. Further, Al in polyaluminum chloride3+Can enter between C-S-H gel chains to replace Si in the C-S-H gel and participate in the formation process of the C-S-H gel, the Ca/(Si + Al) ratio of a hydration product is reduced, the hydration degree of a cementing material at an interface is improved, the amount of the hydration product is increased, interface gaps are filled, and a bonding interface is more compact.
The purpose of the invention using the hollow glass beads is as follows: the hollow glass beads have a hollow structure, have the characteristics of light weight, large volume, high compressive strength, good fluidity and the like, can greatly reduce the density of the material, and can endow the material with excellent heat insulation, sound insulation and other properties.
Preferably, the floating beads have an average particle diameter D501-5 μm, and specific surface area of 3000-3600 m2/kg。
Preferably, the silica fume is SiO292-98% of mass percent and 15000m of specific surface area2/kg～18000m2(ii) an unencrypted silica fume of/kg.
Preferably, the density of the hollow glass microspheres is 360kg/m3～400kg/m3The compressive strength is 38MPa to 43MPa, and the particle size is not more than 80 mu m and not more than D90≤90μm。
Preferably, the phosphogypsum is formed by grinding undisturbed phosphogypsum to the specific surface area of 800m2/kg～900m2/kg。
Preferably, the specific surface area of the polyaluminum chloride is 180m2/kg～200m2/kg。
Preferably, the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:1.5-2:150-180, and the volume ratio of the cementing material to the hollow glass beads is 1: 5-7.
Preferably, the cementing material comprises the following components in percentage by mass: 68-75% of cement, 18-20% of floating bead, 3-6% of silica fume, 1-2% of phosphogypsum and 3-4% of polyaluminium chloride, wherein the sum of the percentages of the cement, the floating bead, the silica fume, the phosphogypsum and the polyaluminium chloride is 100%. The proposal is beneficial to the better matching among the components of the cementing material, and the finally obtained ultralight cement-based composite material has the compression strength of 14.4-15.2MPa and the density of 870-3Resistance to chloride ion permeability of 3.6X 10-12-4×10-12m2/s。
The invention also provides a preparation method of the high-strength ultralight cement-based composite material, which is characterized by comprising the following steps:
(1) placing the hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2 hours, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass of 10-20% of the total water, mixing and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steaming for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material. The scheme is that the hollow glass beads are pretreated in order to roughen the surfaces of the hollow glass beads through alkaline etching and increase the binding power between the hollow glass beads and hydration products of the cementing materials, so that the strength and the chloride ion permeability resistance are improved.
The invention has the beneficial effects that:
the cementing material is matched with the hollow glass beads to obtain the ultra-light cement-based composite material with low density and high strength, and the ultra-light cement-based composite material has excellent chloride ion permeability resistance effect, has better application prospect on the offshore floating buildings, and is beneficial to promoting the construction of the offshore floating buildings (artificial floating islands, floating platforms, floating boxes for engineering and the like).
Drawings
FIG. 1 is a process flow diagram of the preparation method of the present invention
Detailed Description
The following specific examples further illustrate the invention in detail.
In the following examples: the cement is Portland cement (42.5, 52.5 and 62.5 grades) with the strength grade not lower than 42.5 grade; the average particle diameter of the floating beads is 1-5 mu m, and the specific surface area is 3000-3600 m2Per kg; the silica fume is SiO292-98% of mass percent and 15000m of specific surface area2/kg～18000m2(ii) a non-fumed silica fume of/kg; the density of the hollow glass beads is 360kg/m3～400kg/m3The compressive strength is 38MPa to 43MPa, and the particle size is not more than 80 mu m and not more than D90Less than or equal to 90 mu m; grinding the phosphogypsum into powder with the specific surface area of 800m by taking the phosphogypsum as the original state2/kg～900m2/kg；The specific surface area of the polyaluminum chloride is 180m2/kg～200m2Per kg; the water reducing rate of the polycarboxylic acid high-performance water reducing agent is more than 30 percent.
Example 1
The implementation provides an ultralight cement-based composite material, which comprises the following components: cementing material, hollow glass bead, polycarboxylic acid high-performance water reducing agent and water,
wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:2: 100;
the volume ratio of the cementing material to the hollow glass beads is 1: 5;
the cementing material is prepared by mixing the following components in percentage by mass: 62.5% of cement, 25% of floating beads, 5% of silica fume, 2.5% of phosphogypsum and 5% of polyaluminium chloride.
The process flow of the preparation method of the ultra-light cement-based composite material is shown in figure 1, and the preparation method comprises the following specific steps:
(1) placing hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2h, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass fraction of 10% (namely 10% of the mass of the whole water), mixing, and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, then adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steam curing for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
Example 2
The implementation provides an ultralight cement-based composite material, which comprises the following components: cementing material, hollow glass bead, polycarboxylic acid high-performance water reducing agent and water,
wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:2.5: 200;
the volume ratio of the cementing material to the hollow glass beads is 1: 4;
the cementing material is prepared by mixing the following components in percentage by mass: 57% of cement, 25% of floating beads, 10% of silica fume, 3% of phosphogypsum and 5% of polyaluminium chloride.
The process flow of the preparation method of the ultra-light cement-based composite material is shown in figure 1, and the preparation method comprises the following specific steps:
(1) placing hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2h, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass fraction of 15% (namely 15% of the total water mass), mixing, and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, then adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steam curing for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
Example 3
The implementation provides an ultralight cement-based composite material, which comprises the following components: cementing material, hollow glass bead, polycarboxylic acid high-performance water reducing agent and water,
wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:1.5: 160;
the volume ratio of the cementing material to the hollow glass beads is 1: 7;
the cementing material is prepared by mixing the following components in percentage by mass: 69% of cement, 19.5% of floating beads, 5.5% of silica fume, 2% of phosphogypsum and 4% of polyaluminium chloride.
The process flow of the preparation method of the ultra-light cement-based composite material is shown in figure 1, and the preparation method comprises the following specific steps:
(1) placing hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2h, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass fraction of 20% (namely 20% of the total water mass), mixing, and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, then adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steam curing for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
Example 4
The implementation provides an ultralight cement-based composite material, which comprises the following components: cementing material, hollow glass bead, polycarboxylic acid high-performance water reducing agent and water,
wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:1.8: 150;
the volume ratio of the cementing material to the hollow glass beads is 1: 6;
the cementing material is prepared by mixing the following components in percentage by mass: 72.5% of cement, 19% of floating beads, 3.5% of silica fume, 1.5% of phosphogypsum and 3.5% of polyaluminium chloride.
The process flow of the preparation method of the ultra-light cement-based composite material is shown in figure 1, and the preparation method comprises the following specific steps:
(1) placing hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2h, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass fraction of 12% (namely 12% of the total water mass), mixing, and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, then adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steam curing for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
Example 5
The implementation provides an ultralight cement-based composite material, which comprises the following components: cementing material, hollow glass bead, polycarboxylic acid high-performance water reducing agent and water,
wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:2: 180;
the volume ratio of the cementing material to the hollow glass beads is 1: 5;
the cementing material is prepared by mixing the following components in percentage by mass: 68% of cement, 20% of floating beads, 6% of silica fume, 2% of phosphogypsum and 4% of polyaluminium chloride.
The process flow of the preparation method of the ultra-light cement-based composite material is shown in figure 1, and the preparation method comprises the following specific steps:
(1) placing hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2h, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass fraction of 18% (namely 18% of the total water mass), mixing, and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, then adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steam curing for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
Example 6
The implementation provides an ultralight cement-based composite material, which comprises the following components: cementing material, hollow glass bead, polycarboxylic acid high-performance water reducing agent and water,
wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:1.7: 170;
the volume ratio of the cementing material to the hollow glass beads is 1: 5.5;
the cementing material is prepared by mixing the following components in percentage by mass: 75% of cement, 18% of floating beads, 3% of silica fume, 1% of phosphogypsum and 3% of polyaluminium chloride.
The process flow of the preparation method of the ultra-light cement-based composite material is shown in figure 1, and the preparation method comprises the following specific steps:
(1) placing hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2h, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass fraction of 10% (namely 10% of the mass of the whole water), mixing, and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, then adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steam curing for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
Example 7
The implementation provides an ultralight cement-based composite material, which comprises the following components: cementing material, hollow glass bead, polycarboxylic acid high-performance water reducing agent and water,
wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:2.2: 130;
the volume ratio of the cementing material to the hollow glass beads is 1: 8;
the cementing material is prepared by mixing the following components in percentage by mass: 78% of cement, 15% of floating beads, 3% of silica fume, 1% of phosphogypsum and 3% of polyaluminium chloride.
The process flow of the preparation method of the ultra-light cement-based composite material is shown in figure 1, and the preparation method comprises the following specific steps:
(1) placing hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2h, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass fraction of 15% (namely 15% of the total water mass), mixing, and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, then adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steam curing for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
Example 8
The implementation provides an ultralight cement-based composite material, which comprises the following components: cementing material, hollow glass bead, polycarboxylic acid high-performance water reducing agent and water,
wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:1: 190;
the volume ratio of the cementing material to the hollow glass beads is 1: 3;
the cementing material is prepared by mixing the following components in percentage by mass: 62% of cement, 23% of floating beads, 7% of silica fume, 3% of phosphogypsum and 5% of polyaluminium chloride.
The process flow of the preparation method of the ultra-light cement-based composite material is shown in figure 1, and the preparation method comprises the following specific steps:
(1) placing hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2h, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass fraction of 20% (namely 20% of the total water mass), mixing, and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, then adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steam curing for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
Performance testing
Test standard of compressive strength test: refer to GBT17671-1999 in the national Standard "Cement mortar Strength test method (ISO method)".
Chloride ion permeability resistance test standard: refer to the national standard GBT50082-2009 standard for testing the long-term performance and the durability of common concrete.
Examples 1-8 the results of testing ultralight cement-based composites are shown in table 1 below.
TABLE 1 detection results of ultralight cement-based composite materials
The existing chlorine ion permeability resistance data of concrete for offshore environment is about 4 multiplied by 10-12m2As can be seen from the above table, the composite material obtained by the invention has low density, high strength and chloride ion permeability resistance equivalent to that of the existing marine concrete used in the marine environment, so that the composite material can be widely used for the bearing structures of various marine floating buildings (artificial floating islands, floating platforms, engineering buoyancy tanks and the like).
Claims (6)
1. The high-strength ultra-light cement-based composite material is characterized by comprising the following components: the water-based composite material comprises a cementing material, hollow glass beads, a polycarboxylic acid high-performance water reducing agent and water, wherein the mass ratio of the cementing material to the polycarboxylic acid high-performance water reducing agent to the water is 100:1-2.5:100-200, and the volume ratio of the cementing material to the hollow glass beads is 1: 3-8;
the cementing material comprises the following components in percentage by mass: 57-78% of cement, 15-25% of floating beads, 3-10% of silica fume, 1-3% of phosphogypsum and 3-5% of polyaluminium chloride, wherein the sum of the percentages of the cement, the floating beads, the silica fume, the phosphogypsum and the polyaluminium chloride is 100%;
the silica fume is SiO292-98% of mass percent and 15000m of specific surface area2/kg～18000m2(ii) a non-fumed silica fume of/kg;
the density of the hollow glass beads is 360kg/m3～400kg/m3The compressive strength is 38MPa to 43MPa, and the particle size is not more than 80 mu m and not more than D90≤90μm；
The specific surface area of the polyaluminum chloride is 180m2/kg～200m2/kg。
2. The high strength ultra light weight cement-based composite material of claim 1, wherein the floating beads have an average particle size D501-5 μm, and specific surface area of 3000-3600 m2/kg。
3. The high-strength ultra-light cement-based composite material as claimed in claim 1, wherein the phosphogypsum is an undisturbed phosphogypsum ground to a specific surface area of 800m2/kg～900m2/kg。
4. The high-strength ultra-light cement-based composite material as claimed in claim 1, wherein the mass ratio of the cementing material, the polycarboxylic acid-based high-performance water reducing agent and the water is 100:1.5-2:150-180, and the volume ratio of the cementing material to the hollow glass beads is 1: 5-7.
5. The high-strength ultra-light cement-based composite material as claimed in claim 1, wherein the cementitious material comprises the following components in mass percent: 68-75% of cement, 18-20% of floating bead, 3-6% of silica fume, 1-2% of phosphogypsum and 3-4% of polyaluminium chloride, wherein the sum of the percentages of the cement, the floating bead, the silica fume, the phosphogypsum and the polyaluminium chloride is 100%.
6. A method for preparing a high strength ultra light weight cement based composite material as claimed in any one of claims 1 to 5, characterized by the steps of:
(1) placing the hollow glass beads in 17-23 ℃ saturated limewater clear liquid, stirring and carrying out alkaline etching for 2 hours, then washing to be neutral, drying at 60 ℃, naturally cooling, adding water with the mass of 10-20% of the total water, mixing and carrying out pre-wetting treatment to obtain a component A;
(2) premixing cement, floating beads, silica fume, phosphogypsum and polyaluminium chloride serving as cementing material components to obtain a component B, and mixing a polycarboxylic acid high-performance water reducing agent with the rest water to obtain a component C;
(3) placing the component A in a stirrer and mixing for 1 minute, adding the component B and mixing for 1 minute, finally adding the component C and mixing for 3-5 minutes, injecting into a mold after the slurry is uniformly mixed, placing at 60 ℃ for steaming for 3 days, and naturally cooling to room temperature to obtain the ultralight cement-based composite material.
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| CN111019616A (en) * | 2019-11-15 | 2020-04-17 | 中国石油化工集团有限公司 | Low-density cement slurry for well cementation operation and cement composition for well cementation operation |
| CN115073028A (en) * | 2022-07-25 | 2022-09-20 | 贵阳中建西部建设有限公司 | Environment-friendly light cementing material and preparation method thereof |
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