CN113800862B - Ultrahigh-strength steel quick-setting concrete polyurea composite material and preparation method and application thereof - Google Patents

Ultrahigh-strength steel quick-setting concrete polyurea composite material and preparation method and application thereof Download PDF

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CN113800862B
CN113800862B CN202110952795.6A CN202110952795A CN113800862B CN 113800862 B CN113800862 B CN 113800862B CN 202110952795 A CN202110952795 A CN 202110952795A CN 113800862 B CN113800862 B CN 113800862B
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CN113800862A (en
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孙光
霍显铭
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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
    • C04B28/06—Aluminous cements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • 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
    • C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

The invention relates to a super-high-strength steel quick-setting concrete polyurea composite material and a preparation method and application thereof, wherein the super-high-strength steel quick-setting concrete polyurea composite material comprises a high-strength self-flowing concrete layer, wherein two sides of the high-strength self-flowing concrete layer are respectively compounded with an explosion-proof steel plate, and the outer sides of the two explosion-proof steel plates are respectively compounded with a lead alloy thin plate; 6-8mm of polyurea coating is smeared on each surface of the ultrahigh-strength steel rapid-hardening concrete polyurea composite material; the high-strength gravity flow concrete is prepared from the following raw materials in parts by weight: 25-30 parts of cement, 65-75 parts of aggregate, 0-5 parts of mineral admixture, 1-3 parts of steel fiber, 0.1-0.3 part of additive, 0.5-1.5 parts of expanding agent, 0.1-0.3 part of coagulant and 6-6.8 parts of water. The invention has the excellent characteristics of high strength, high power bullet resistance, high bending resistance, tensile resistance, spalling resistance, high elasticity, energy absorption, wave absorption, explosion-proof bullet fragment, high-speed splashing secondary damage of concrete fragment, nuclear radiation prevention, shock wave prevention and the like, and is suitable for wide application in explosion-proof walls, national defense facilities and military airport ground rush repair engineering.

Description

Ultrahigh-strength steel quick-setting concrete polyurea composite material and preparation method and application thereof
Technical Field
The invention relates to the technical field of concrete and a preparation process thereof, in particular to an ultrahigh-strength steel quick-setting concrete polyurea composite material, a preparation method thereof and application thereof in explosion-proof walls, national defense nuclear radiation and military airport ground emergency repair facilities.
Background
At present, with the rapid development of national defense and military technologies, the explosive force of bombs is continuously improved, higher requirements are provided for the performance of concrete, and the realization of green concrete building materials is required, so that resources and energy are required to be saved, sustainable development is required, and the environment is friendly and is beneficial to the environment.
With the continuous development of technological progress, the improvement of the performance of special bullet-proof walls for military industry is the key to improve defense and combat. The wall body destroyed by the shell needs to strengthen the nuclear radiation prevention capability due to military operation needs, requires high construction speed, high early strength, self-flow high strength, vibration-free and the like, but has the problems that the construction speed is low, the early strength is low, vibration noise pollution can occur in the construction process, and the concrete at the edge of an explosion-proof wall is difficult to reach the compactness and the like.
Therefore, the research on the ultrahigh-strength steel quick-setting concrete polyurea composite material, the preparation method thereof and the application thereof in explosion-proof walls, national defense nuclear radiation and military airport ground emergency repair facilities are very important.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an ultra-high strength steel quick-setting concrete polyurea composite material, a preparation method thereof and application thereof in explosion-proof walls and national defense nuclear radiation and military airport ground emergency repair facilities, so as to solve the problems in the background technology.
The technical scheme of the invention is realized as follows:
the ultrahigh-strength steel quick-setting concrete polyurea composite material comprises a high-strength self-flowing concrete layer, wherein two sides of the high-strength self-flowing concrete layer are respectively compounded with an explosion-proof steel plate, and the outer sides of the two explosion-proof steel plates are respectively compounded with a lead alloy thin plate; coating polyurea coating with the thickness of 6-8mm on each surface of the ultra-high-strength steel rapid-hardening concrete polyurea composite material; the high-strength gravity flow concrete is prepared from the following raw materials in parts by weight: 25-30 parts of cement, 65-75 parts of aggregate, 0-5 parts of mineral admixture, 1-3 parts of steel fiber, 0.1-0.3 part of additive, 0.5-1.5 parts of expanding agent, 0.1-0.3 part of coagulant and 6-6.8 parts of water.
Preferably, the high-strength gravity flow concrete layer is included, two sides of the high-strength gravity flow concrete layer are respectively compounded with an explosion-proof steel plate, and the outer sides of the two explosion-proof steel plates are respectively compounded with a lead alloy thin plate; coating 7mm of polyurea coating on each surface of the ultra-high-strength steel rapid-hardening concrete polyurea composite material; the high-strength gravity flow concrete is prepared from the following raw materials in parts by weight: 28 parts of cement, 70 parts of aggregate, 2 parts of mineral admixture, 2 parts of steel fiber, 0.2 part of additive, 1 part of expanding agent, 0.2 part of coagulant and 6.5 parts of water.
Preferably, the cement is aluminate alumina A50 grade; the expanding agent is magnesium oxide powder, the purity of the magnesium oxide powder is 90-99%, and the particle size of the magnesium oxide powder is 200-300 meshes.
Preferably, the aggregate is quartz sand aggregate; the mineral admixture is fly ash.
Preferably, the steel fibers have a length of 22-27mm, a width of 0.5-1.5mm and a thickness of 0.3-0.7mm.
Preferably, the mechanical properties of the explosion-proof steel plate are tensile strength 2060-2100 MPa, yield strength 1760-1820 MPa, elongation 11-12%, brinell hardness 560-650 HB and density 7-8 g/cm 3 。
Preferably, the additive is a high-efficiency water reducing agent, and the water reducing rate of the high-efficiency water reducing agent is more than or equal to 50%; the coagulant is a lithium salt coagulant.
Preferably, the ultra-high-strength steel rapid-hardening concrete polyurea composite material is a cuboid block composite material, the length is 1800-2200 mm, the width is 300-1000 mm, and the height is 800-1200 mm; the thickness of the explosion-proof steel plate is 10-100 mm, and the thickness of the lead alloy thin plate is 0.5-5 mm.
A preparation method of an ultrahigh-strength steel quick-setting concrete polyurea composite material comprises the following steps:
(1) Firstly, erecting a template and binding reinforcing steel bars, then removing impurities and accumulated water on a substrate, and putting cement mortar into the substrate of the template, wherein the cement mortar has the water content of 6-8% by weight and the thickness of 50-100mm; laying carbon fiber cloth; respectively placing the two lead alloy thin plates on the inner sides of the templates in opposite directions to be tightly attached, and then respectively passing through the universal glue composite explosion-proof steel plates on the inner sides of the two lead alloy thin plates, and reserving a space between the two explosion-proof steel plates for pouring a concrete layer;
(2) Weighing raw materials according to parts by weight, uniformly mixing the raw materials at normal temperature, putting the raw materials into a pump, extending a discharge port of a pump pipe into a template, and reserving a space between two anti-explosion steel plates for pouring high-strength self-flow concrete, wherein the self-compaction of the concrete is achieved by utilizing kinetic energy generated by the falling of the concrete, and a guide pipe or a chute can be used when the throwing height exceeds 12 meters; the pumping and pouring of the high-strength self-flowing concrete keep continuity; the distance between the pouring and distributing points is 1 to 2 meters;
(3) After the high-strength self-flowing vibration-free concrete is poured, maintaining for 1-4 h, wherein the maintaining measures are covering, sprinkling, spraying a curing agent or moisturizing by using a film;
(4) And (4) covering carbon fiber cloth on each surface of the composite material molded by casting in the step (3), and coating polyurea coating with the thickness of 6-8mm to obtain a finished product.
The ultrahigh-strength steel rapid-hardening concrete polyurea composite material is applied to bulletproof walls and national defense radiation protection facilities, wherein the rapid-hardening concrete polyurea composite material is applied to military airport ground rush-repair facilities.
The invention has the following beneficial effects:
(1) The strength of the existing explosion-proof steel concrete wall is not lower than C20, the steel bar is calculated by the structure but not lower than the strength grade of the concrete, and the concrete wall is divided into twelve grades of C7.5, C10, C15, C20, C25, C30, C35, C40, C45, C50, C55 and C60 according to the cubic compressive strength. The high-performance strength of the invention exceeds the best performance of C60 in the original industry standard, can reach initial setting for 10 minutes, can reach C40 in 3 hours, can reach C60 in one day, and can reach C65, C70, C75, C80, C85, C90, C95 and C100 in 28 days.
(2) The steel fiber and the carbon fiber cloth are introduced, so that the strength and the toughness of the concrete can be enhanced, and the explosion-proof capability is improved; the magnesium oxide powder is added into the formula, has a micro-expansion effect in concrete, and can prevent shrinkage cracking in winter due to thermal expansion and cold contraction; a proper amount of fly ash is added to improve the workability of concrete, increase the compactness and reduce the hydration heat; the imported high-efficiency water reducing agent has low water adding amount and is beneficial to construction;
(3) The invention adopts an ultra-high strength alloy explosion-proof steel plate and an anti-nuclear radiation shielding lead alloy thin plate to be compounded outside concrete, and the mechanical properties of the adopted explosion-proof steel plate are that the tensile strength is 2060MPa to 2100MPa, the yield strength is 1760MPa to 1820MPa, the elongation is 11 to 12 percent, the Brinell hardness is 560 HB to 650HB, and the density is 7.86g/cm 3 The composite material has the excellent characteristics of high strength, high bending resistance, high tensile strength, high peeling resistance, high elasticity, explosion resistance, secondary damage resistance, nuclear radiation resistance and the like.
(4) The invention adopts the vibration-free self-flowing concrete technology, and adopts the high-performance water reducing agent to fill the template and to be uniform and compact, thereby solving the problems of the self-flowing concrete workability, the self-compactness, the bleeding property, the non-separation of fine powder and aggregate, and the like. The carbon fiber cloth can prevent secondary splashing when pouring.
(5) The composite material is a novel multifunctional composite explosion-proof impact nuclear radiation-proof component module wall and emergency repair fast-hardening concrete, and the high-strength self-flow concrete steel fiber carbon fiber cloth composite polyurea coating and the preparation method thereof and the application thereof on bulletproof walls, airport pavements and national defense radiation-proof equipment improve the defense fighting capability of troops. The thickness of the bulletproof wall is reasonably set to be different, such as 200mm300mm,500mm,600mm,700mm,800mm,900mm,1000mm and the like according to different explosion impact forces of live ammunition. The combined module is wide in application and convenient to transport, and is matched with an explosion-proof wall suitable for requirements according to different defense requirements.
Drawings
FIG. 1 is a schematic structural diagram of an ultra-high strength steel rapid-hardening concrete polyurea composite material.
In the attached drawings, 1 is a lead alloy thin plate, 2 is an explosion-proof steel plate, 3 is a high-strength concrete layer, 4 is the explosion-proof steel plate, and 5 is the lead alloy thin plate.
Detailed Description
For a more clear understanding of the technical features, objects and advantages of the present invention, reference is now made to the following detailed description of the embodiments of the present invention taken in conjunction with the accompanying drawings, which are included to illustrate and not to limit the scope of the present invention.
The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1
As shown in fig. 1: the high-strength steel concrete polyurea coating composite material is a cuboid massive composite material and is divided into 5 layers, wherein the first layer and the fifth layer are lead alloy thin plates, the second layer and the fourth layer are explosion-proof steel plates, the third layer is a high-strength gravity flow concrete layer, namely, the explosion-proof steel plates are respectively compounded on two sides of the high-strength gravity flow concrete layer, and the outer sides of the two explosion-proof steel plates are respectively compounded with the lead alloy thin plates; the ultra-high-strength steel quick-setting concrete polyurea composite material comprises six surfaces, wherein each surface is coated with 6mm of polyurea coating; the length of the ultra-high strength steel quick-setting concrete polyurea composite material is 1800mm, the width of the composite material is 1000mm, and the height of the composite material is 800mm; the thickness of the explosion-proof steel plate is 100mm, and the thickness of the lead alloy thin plate is 0.5mm;
the mechanical properties of the explosion-proof steel plate are that the tensile strength is 2060MPa to 2100MPa, the yield strength is 1760MPa to 1820MPa, the elongation is 11 to 12 percent, the Brinell hardness is 560 HB to 650HB, and the density is 7 to 8g/cm 3 。
The high-strength gravity flow concrete is prepared from the following raw materials in parts by weight: 30 parts of aluminate alumina A50-grade cement, 65 parts of quartz sand aggregate, 0 part of fly ash mineral admixture, 1 part of steel fiber, 0.1 part of high-efficiency water reducing agent (the water reducing rate is more than or equal to 50%), 0.5 part of expanding agent magnesium oxide powder (the purity of the magnesium oxide powder is 95%, and the particle size of the magnesium oxide powder is 250 meshes), 0.1 part of lithium carbonate coagulant and 6 parts of water; the length of the steel fiber is 22mm, the width of the steel fiber is 1.5mm, and the thickness of the steel fiber is 0.3mm. The quartz sand aggregate comprises 28 parts of quartz sand aggregate I and 37 parts of quartz sand aggregate II.
Example 2
As shown in fig. 1: the high-strength steel concrete polyurea coating composite material is a cuboid block composite material and is divided into 5 layers, wherein the first layer and the fifth layer are lead alloy thin plates, the second layer and the fourth layer are explosion-proof steel plates, the third layer is a high-strength self-flowing concrete layer, namely, the two sides of the high-strength self-flowing concrete layer are respectively compounded with the explosion-proof steel plates, and the outer sides of the two explosion-proof steel plates are respectively compounded with the lead alloy thin plates; the ultra-high-strength steel quick-setting concrete polyurea composite material comprises six surfaces, wherein 7mm of polyurea coating is coated on each surface; the length of the ultra-high strength steel quick-setting concrete polyurea composite material is 2000mm, the width of the composite material is 300mm, and the height of the composite material is 1000mm; the thickness of the explosion-proof steel plate is 10mm, and the thickness of the lead alloy thin plate is 0.5mm;
the mechanical properties of the explosion-proof steel plate are that the tensile strength is 2060MPa to 2100MPa, the yield strength is 1760MPa to 1820MPa, the elongation is 11 to 12 percent, the Brinell hardness is 560 HB to 650HB, and the density is 7 to 8g/cm 3 。
The high-strength gravity flow concrete is prepared from the following raw materials in parts by weight: 28 parts of aluminate alumina A50-grade cement, 6 parts of quartz sand aggregate, 2 parts of fly ash mineral admixture, 2 parts of steel fiber, 0.2 part of high-efficiency water reducing agent (the water reducing rate is more than or equal to 50%), 1 part of expanding agent magnesium oxide powder (the purity of the magnesium oxide powder is 90%, and the particle size of the magnesium oxide powder is 200 meshes), 0.2 part of lithium carbonate coagulant and 6.5 parts of water; the steel fiber has the length of 25mm, the width of 1mm and the thickness of 0.5mm.
The quartz sand aggregate comprises 30 parts of quartz sand aggregate I and 40 parts of quartz sand aggregate II.
Example 3
As shown in fig. 1: the high-strength steel concrete polyurea coating composite material is a cuboid block composite material and is divided into 5 layers, wherein the first layer and the fifth layer are lead alloy thin plates, the second layer and the fourth layer are explosion-proof steel plates, the third layer is a high-strength self-flowing concrete layer, namely, the two sides of the high-strength self-flowing concrete layer are respectively compounded with the explosion-proof steel plates, and the outer sides of the two explosion-proof steel plates are respectively compounded with the lead alloy thin plates; the ultra-high-strength steel quick-setting concrete polyurea composite material comprises six surfaces, wherein each surface is coated with 8mm of polyurea coating; the length of the ultra-high strength steel quick-setting concrete polyurea composite material is 2200mm, the width of the composite material is 800mm, and the height of the composite material is 1200mm; the thickness of the explosion-proof steel plate is 100mm, and the thickness of the lead alloy thin plate is 5mm;
the mechanical properties of the explosion-proof steel plate are that the tensile strength is 2060MPa to 2100MPa, the yield strength is 1760MPa to 1820MPa, the elongation is 11 to 12 percent, the Brinell hardness is 560 HB to 650HB, and the density is 7 to 8g/cm 3 。
The high-strength self-flowing concrete is prepared from the following raw materials in parts by weight: 25 parts of aluminate alumina A50-grade cement, 75 parts of quartz sand aggregate, 5 parts of fly ash mineral admixture, 3 parts of steel fiber, 0.2 part of high-efficiency water reducing agent (the water reducing rate is more than or equal to 50%), 1.5 parts of expanding agent magnesium oxide powder (the purity of the magnesium oxide powder is 99%, and the particle size of the magnesium oxide powder is 300 meshes), 0.1 part of lithium carbonate coagulant and 6.8 parts of water; the steel fiber has the length of 27mm, the width of 0.5mm and the thickness of 0.7mm.
The quartz sand aggregate comprises quartz sand aggregate I and quartz sand aggregate II, and the quartz sand aggregate I is 32 parts and the quartz sand aggregate II is 43 parts.
The above examples 1-3 were prepared as follows:
the technological principle of the invention is that reasonable gradation is adopted, the steel fiber and the high-efficiency water reducing agent are added according to the mixing ratio, so that the concrete mixture has high fluidity, no segregation and bleeding are generated after casting, and the casting has good fluidity and compactness.
(1) Preparation before casting:
the military project is quickly repaired, and the high-strength self-flowing vibration-free concrete has a special application range and is carefully prepared according to the structural form and the impact resistance; firstly, erecting a template and binding reinforcing steel bars, checking the quality of the erecting of the template and the binding of the reinforcing steel bars, fully considering the impact force of the high-strength self-flowing vibration-free concrete, and avoiding the phenomena of reinforcing steel bar displacement, mold expansion and slurry leakage and influence on the engineering quality; removing impurities and accumulated water on the substrate during pouring, and placing cement mortar on the substrate of the template, wherein the water content of the cement mortar is 6-8% by weight, and the thickness of the cement mortar is 50-100mm; laying carbon fiber cloth again to prevent the free falling concrete coarse aggregate from bouncing; and then the two lead alloy sheets are respectively placed on the inner sides of the templates in the opposite directions and tightly attached, the inner sides of the two lead alloy sheets are respectively compounded with the explosion-proof steel plates through the universal glue, and a space is reserved between the two explosion-proof steel plates for pouring a concrete layer.
(2) Pouring the high-strength steel vibration-free concrete:
weighing raw materials according to parts by weight, uniformly mixing the raw materials at normal temperature, putting the raw materials into a pump, extending a discharge port of a pump pipe into a template, and reserving a space between two anti-explosion steel plates for pouring high-strength self-flow concrete, wherein the self-compaction of the concrete is achieved by utilizing kinetic energy generated by the falling of the concrete, and measures such as a guide pipe, a chute and the like can be used when the throwing height exceeds 12 meters; the pouring and distributing points should be combined with the mixing characteristics and engineering characteristics of concrete to select proper intervals which are generally not more than 2 meters; when the structural member steel bars are dense, the material distribution points are required to be dense; the construction part of the high-strength free-flowing vibration-free concrete generally has particularity, and if a construction joint is formed, the construction is difficult to carry out according to the relevant requirements of the construction joint. Thus, the pumping and casting of concrete should maintain its continuity.
(3) Curing the high-strength self-flowing vibration-free concrete:
after the high-strength self-flowing vibration-free concrete is poured, timely curing is required, and the curing time is not less than 4 hours; the high-strength free-flowing vibration-free concrete after pouring is applied with curing measures such as covering, sprinkling, spraying curing agent or moisturizing by using a film. After the construction is finished, the engineering entity is detected, all performances of the high-strength free-flowing vibration-free concrete can better meet expected requirements, and quality defects of non-compact concrete, pitted surface and the like are avoided.
(4) The high-strength steel vibration-free concrete composite polyurea coating comprises:
covering carbon fiber cloth on each surface of the composite material prepared in the step (3), and then selecting polyurea coating to coat the carbon fiber cloth for spraying, wherein the thickness is 6-8mm, and the optimal thickness is 7mm, so as to obtain a finished product. The product model of the polyurea coating is as follows: the coating comprises an APC-2100 anti-fragmentation coating, an APC-3350 anti-explosion coating, an APC-AB anti-explosion coating, an APC-BC anti-explosion coating and an APC-BS anti-explosion coating; the bulletproof and explosion-proof products with different performances can be researched and customized for users, and the researched and developed series products all adopt domestic raw materials to completely replace imported products. The properties of the above antiknock coating are shown in tables 1 and 2.
1. Raw materials
The kinds and properties of the raw materials used in examples 1 to 3 are shown in tables 1 to 7, and are as follows:
table 1 performance index of polyurea coatings.
Main index/model APC-2100 APC-3350 APC-AB APC-BC APC-BS
Tensile strength (Mpa) 15 23 25 36 25
Tear Strength (N/mm) 86 137 96 128 96
Elongation at Break (%) 90 160 350 340 500
Shore hardness D50 D60 A95 A95 D45
Table 2 performance index of polyurea coatings.
Figure BDA0003218765140000071
● Good quality
The polyurea coating is cured for 7 days under the conditions of the temperature of 20-25 ℃ and the humidity of 65.0 percent, and the performance detection is carried out to obtain the result.
TABLE 3 technical parameters of aluminate aluminas grade A50.
Figure BDA0003218765140000072
Figure BDA0003218765140000081
Table 4 performance index of quartz sand aggregate I.
Origin of birth Containing mud Mud block Particle size Needle-like content Apparent density Crush index
Liaoning medicine 0％ 0％ 20-5mm 4％ 2.600Kg/m 3 5％
Table 5 performance index for quartz sand aggregate II.
Producing area Containing mud Mud block Particle size Modulus of fineness Apparent density Bulk density
Liaoning medicine 0％ 0％ 2-0.5mm 2.5 2.580Kg/m 3 1380Kg/m 3
Table 6 technical indices of fly ash.
Producing area Variety of (IV) C Fineness of fineness Water demand ratio Loss on ignition
Liaoning power plant Level 1 7.2％ 92％ 2.8％
Table 7 technical indices of superplasticizers.
Figure BDA0003218765140000082
2. Performance test
1. The concrete sample prepared in the embodiment 2 of the invention is subjected to performance test, and the test results are as follows:
(1) The average value of the flow value is 256mm, and the fluidity meets the construction requirement.
(2) Molding test pieces with strength detection for 3 hours, 1 day, 7 days and 28 days by gravity flow casting; and the results of the free-flow casting strength test are shown in table 8.
Table 8 strength comparison table.
Figure BDA0003218765140000083
The data show that the compressive strength of the high-strength gravity flow concrete at different times is suitable for the construction of the vibration-free method.
The ultrahigh-strength steel rapid-hardening concrete polyurea composite material prepared according to the formula and the structure of the embodiments 1 to 3 and the preparation method can be applied to bullet-proof walls and national defense radiation protection facilities, and the proportion in the formula and the thickness proportion of the lead alloy thin plate, the explosion-proof steel plate and the concrete layer in the structure can be adjusted according to the attack force of bullets to improve the performance so as to achieve the purposes of bullet prevention and radiation protection. The invention can meet the rapid construction characteristics of military combat, has high performance and high strength for resisting the sniping performance of a big-firepower cannonball, and on one hand, the excellent performance of the concrete improves the impact force of the cannonball; on the other hand, the composite polyurea carbon fiber coating enhances the bulletproof property and reduces the impact force. The application of the ultra-high strength alloy explosion-proof steel plate and the application of the nuclear radiation prevention shielding lead alloy thin plate two-layer structure strengthening nuclear radiation prevention and military airport pavement first-aid repair material.
The above embodiments are merely provided to help understand the method and core principle of the present invention, and the main steps and embodiments of the present invention are described in detail by using specific examples. To one skilled in the art, in light of the underlying principles of the invention, various conditions and parameters may be modified as desired in particular implementations, and in light of the above, this description should not be taken as limiting the invention.

Claims (4)

1. The super-high-strength steel quick-setting concrete polyurea composite material is characterized in that: the anti-explosion self-flow concrete comprises a high-strength self-flow concrete layer, wherein anti-explosion steel plates are compounded on two sides of the high-strength self-flow concrete layer respectively, and lead alloy thin plates are compounded on the outer sides of the two anti-explosion steel plates respectively; 6-8mm of polyurea coating is smeared on each surface of the ultrahigh-strength steel rapid-hardening concrete polyurea composite material; the high-strength self-flowing concrete is prepared from the following raw materials in parts by weight: 25-30 parts of cement, 65-75 parts of aggregate, 0-5 parts of mineral admixture, 1-3 parts of steel fiber, 0.1-0.3 part of additive, 0.5-1.5 parts of expanding agent, 0.1-0.3 part of coagulant and 6-6.8 parts of water;
the cement is aluminate alumina A50 grade; the expanding agent is magnesium oxide powder, the purity of the magnesium oxide powder is 90-99%, and the particle size of the magnesium oxide powder is 200-300 meshes;
the aggregate is quartz sand aggregate; the mineral admixture is fly ash;
the length of the steel fiber is 22-27mm, the width is 0.5-1.5mm, and the thickness is 0.3-0.7mm;
the mechanical properties of the explosion-proof steel plate are that the tensile strength is 2060MPa to 2100MPa, the yield strength is 1760MPa to 1820MPa, the elongation is 11 to 12 percent, the Brinell hardness is 560 HB to 650HB, and the density is 7 to 8g/cm 3 ；
The additive is a high-efficiency water reducing agent, and the water reducing rate of the high-efficiency water reducing agent is more than or equal to 50%; the coagulant is a lithium salt coagulant;
the ultra-high strength steel rapid-hardening concrete polyurea composite material is a cuboid block-shaped composite material, the length is 1800-2200 mm, the width is 300-1000 mm, and the height is 800-1200 mm; the thickness of the explosion-proof steel plate is 10-100 mm, and the thickness of the lead alloy thin plate is 0.5-5 mm.
2. The ultra-high strength steel rapid-hardening concrete polyurea composite material according to claim 1, wherein: the high-strength self-flowing concrete layer is characterized by comprising the high-strength self-flowing concrete layer, wherein two sides of the high-strength self-flowing concrete layer are respectively compounded with an explosion-proof steel plate, and the outer sides of the two explosion-proof steel plates are respectively compounded with a lead alloy thin plate; 7mm of polyurea coating is smeared on each surface of the ultrahigh-strength steel rapid-hardening concrete polyurea composite material; the high-strength gravity flow concrete is prepared from the following raw materials in parts by weight: 28 parts of cement, 70 parts of aggregate, 2 parts of mineral admixture, 2 parts of steel fiber, 0.2 part of additive, 1 part of expanding agent, 0.2 part of coagulant and 6.5 parts of water.
3. A method for preparing the ultra-high strength steel rapid-hardening concrete polyurea composite material according to any one of claims 1 to 2, which is characterized in that: the method comprises the following steps:
(1) Firstly erecting a template and binding reinforcing steel bars, then removing sundries and accumulated water of a substrate, and putting cement mortar into the substrate of the template, wherein the water content of the cement mortar is 6-8% by weight, and the thickness of the cement mortar is 50-100mm; laying carbon fiber cloth; respectively placing the two lead alloy thin plates on the inner sides of the templates in opposite directions to be tightly attached, and then respectively passing through the universal glue composite explosion-proof steel plates on the inner sides of the two lead alloy thin plates, and reserving a space between the two explosion-proof steel plates for pouring a concrete layer;
(2) Weighing raw materials according to parts by weight, uniformly mixing the raw materials at normal temperature, putting the raw materials into a pump, extending a discharge port of a pump pipe into a template, and reserving a space between two anti-explosion steel plates for pouring high-strength self-flow concrete, wherein the self-compaction of the concrete is achieved by utilizing kinetic energy generated by the falling of the concrete, and a guide pipe or a chute can be used when the throwing height exceeds 12 meters; the pumping and pouring of the high-strength self-flowing concrete keep continuity; the distance between the casting and distributing points is 1 to 2 meters;
(3) After the high-strength self-flowing vibration-free concrete is poured, maintaining for 1-4 h, wherein the maintaining measures are covering, sprinkling, spraying a curing agent or moisturizing by using a film;
(4) And (4) covering carbon fiber cloth on each surface of the composite material cast and molded in the step (3), and coating polyurea coating with the thickness of 6-8mm to obtain a finished product.
4. Use of the ultra-high-strength steel rapid-hardening concrete polyurea composite material according to any one of claims 1 to 2 in bullet-proof walls and defense radiation protection facilities, wherein the ultra-high-strength steel rapid-hardening concrete polyurea composite material is used in military airport ground repair facilities.
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