CN115819020A - Light high-strength concrete for prefabricating power grid and preparation process thereof - Google Patents
Light high-strength concrete for prefabricating power grid and preparation process thereof Download PDFInfo
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- CN115819020A CN115819020A CN202211491009.8A CN202211491009A CN115819020A CN 115819020 A CN115819020 A CN 115819020A CN 202211491009 A CN202211491009 A CN 202211491009A CN 115819020 A CN115819020 A CN 115819020A
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims description 12
- 239000004567 concrete Substances 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 12
- 239000011707 mineral Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000004576 sand Substances 0.000 claims description 52
- 239000012615 aggregate Substances 0.000 claims description 51
- 239000003365 glass fiber Substances 0.000 claims description 33
- 239000011162 core material Substances 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 21
- 239000002699 waste material Substances 0.000 claims description 21
- 235000019738 Limestone Nutrition 0.000 claims description 15
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 15
- 239000000440 bentonite Substances 0.000 claims description 15
- 229910000278 bentonite Inorganic materials 0.000 claims description 15
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 15
- 239000006028 limestone Substances 0.000 claims description 15
- 229910052744 lithium Inorganic materials 0.000 claims description 15
- 235000019353 potassium silicate Nutrition 0.000 claims description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 239000004927 clay Substances 0.000 claims description 13
- 238000001354 calcination Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 5
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 5
- 239000008262 pumice Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims 1
- 238000009417 prefabrication Methods 0.000 claims 1
- 239000001117 sulphuric acid Substances 0.000 claims 1
- 235000011149 sulphuric acid Nutrition 0.000 claims 1
- 239000011376 self-consolidating concrete Substances 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011178 precast concrete Substances 0.000 description 4
- 230000004907 flux Effects 0.000 description 2
- 108010025899 gelatin film Proteins 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- -1 polysiloxane Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention relates to the technical field of power grid materials, and discloses light high-strength concrete for prefabricating a power grid, wherein each cubic concrete is prepared from the following raw materials in parts by weight: 600-950 kg of coarse aggregate; 250-400 kg of fine aggregate; 300-400 kg of lightweight aggregate; 250-360 kg of cement; 60-95 kg of fly ash; 30-50 kg of mineral powder; 5-7 kg of defoaming agent; 8-10 kg of water reducing agent; 120-160 kg of water; the lightweight aggregate prepared by the autoclaved technology in the concrete can ensure higher compressive strength of the concrete while reducing the volume weight of the concrete; and a high-performance self-compacting concrete technology is adopted, so that the workability of concrete is enhanced, the concrete pouring quality of the member is ensured, and the appearance quality of the member is ensured.
Description
Technical Field
The invention relates to the technical field of electric power calandria materials, in particular to light high-strength concrete for prefabricating an electric power calandria and a preparation process thereof.
Background
The power grid is a power channel which is used for meeting the requirements of a cable access channel of a transformer substation and an overhead line access to the ground and providing power for matching power supply of a land along the line. The power grid is also called a cable pipe, a power cable pipe, a cement cable pipe, a power grid and the like, and the power grid is generally constructed synchronously in combination with road construction or municipal pipeline construction. The electric power calandria has the outstanding characteristics of high strength and small frictional resistance, the strength of the electric power calandria is 40% higher than that of a common pipe, the bending load of the pipe body is more than or equal to 12000N, the external pressure load is more than or equal to 15000N, and the electric power calandria can be used for laying roads of various levels.
The traditional electric power calandria adopts common concrete, and the apparent density of the concrete is 2350-2400kg/m 3 And the heavy weight brings inconvenience to production, transportation and installation. In order to solve the problem, in the prior art, for example, the light concrete with the authorization publication number of CN105503018B and the special admixture for producing the light concrete are prepared by pouring and hardening the common concrete and a foaming agent which are uniformly doped, and then the light building material with the dense holes and a large number of closed air holes is formed, and has excellent performance and low production cost. The apparent density of the concrete is less than 630kg/m 3 The strength of the prepared prefabricated power grid pipe is not enough, and the prefabricated power grid pipe is easy to crack and is not durable. Therefore, the invention aims to provide the light high-strength self-compacting concrete for prefabricating the electric power grid, and the apparent density of the concrete is less than or equal to 2000kg/m 3 The self weight of the light precast concrete power grid is reduced, the transportation and the installation are convenient, and the strength and the durability of the power grid component are ensured.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide light high-strength concrete for prefabricating an electric power grid and a preparation process thereof, wherein the raw materials in the concrete adopt light aggregate prepared by an autoclaved process, so that the concrete volume weight is reduced, and meanwhile, the concrete can be ensured to have higher compressive strength; and a high-performance self-compacting concrete technology is adopted, so that the workability of concrete is enhanced, the concrete pouring quality of the member is ensured, and the appearance quality of the member is ensured.
In order to achieve the above purpose, the invention provides the following technical scheme:
a light high-strength concrete for prefabricating electric power grid pipes is characterized in that each cubic concrete is composed of the following raw materials by weight:
600-950 kg of coarse aggregate;
250-400 kg of fine aggregate;
300-400 kg of lightweight aggregate;
250-360 kg of cement;
60-95 kg of fly ash;
30-50 kg of mineral powder;
5-7 kg of defoaming agent;
8-10 kg of water reducing agent;
120-160 kg of water.
Preferably, each cubic concrete is composed of the following raw materials by weight:
750kg of coarse aggregate;
300kg of fine aggregate;
350kg of lightweight aggregate;
300kg of cement;
80kg of fly ash;
40kg of mineral powder;
6kg of defoaming agent;
9kg of water reducing agent;
140kg of water.
Preferably, the coarse aggregate comprises yellow sand and crushed stone with the particle size of 5-20mm, wherein the mass ratio of the yellow sand to the crushed stone is 1-1.2.
Preferably, the fine aggregate is machine-made sand with the particle size of 2-5 mm; the machine-made sand is obtained by selecting natural sand with the particle size larger than 0.6mm through a sand making machine, and mixing and calcining the natural sand, lithium bentonite, glass fiber, limestone, water glass and water; the mass ratio of the natural sand to the lithium bentonite, the glass fiber, the limestone and the water glass is 100:5-20:2-10:0.1-0.5:1-5.
Preferably, the preparation method of the machine-made sand comprises the following steps: stir-frying natural sand until the temperature reaches 60 ℃, sequentially adding lithium bentonite, glass fiber, limestone and water glass for mixing, adding water for multiple times to prepare mortar with the water content of less than 5%, subpackaging, shaping and shaping the mortar into blocks, then transferring the blocks into a kiln for calcining for 1-3h, cooling and crushing the blocks to obtain machine-made sand with the particle size of 2-5 mm; wherein the calcining temperature is 1100-1200 ℃.
Lithium-based bentonite, glass fiber, limestone and water glass are added into natural sand at the temperature of 60 ℃, all components can be rapidly and uniformly mixed and are in a primary coating state, then calcination is carried out, the water glass can form a gel film on the surface of the natural sand, the gel film is matched with the lithium-based bentonite soaking hydration expansion performance, the glass fiber and the limestone increase the strength, and when the prepared machine-made sand is mixed with cement, fly ash, mineral powder and the like, rapid self-compacting coagulation can be realized.
Preferably, the lightweight aggregate comprises an inner framework and an outer coating, the inner framework is a porous core material, the porous core material comprises one or a combination of waste ceramics and pumice, the outer coating comprises waste concrete blocks, clay and glass fibers in parts by weight, and the mass ratio of the waste concrete blocks to the clay to the glass fibers is 100-30; wherein the glass fiber has a diameter of 50 to 100 μm.
The preparation method of the lightweight aggregate comprises the following steps:
1) Crushing the porous core material to the particle size of less than 20mm, soaking in acid liquor for 1-3h, airing, then putting into a high-temperature furnace for roasting, and keeping the temperature of the porous core material at 100-120 ℃;
2) Melting the waste concrete blocks in a high-temperature furnace, quickly adding clay and glass fiber after the waste concrete blocks are completely melted, uniformly mixing, pouring the mixture into a porous core material, quickly turning over the porous core material, and cooling to obtain a crude lightweight aggregate;
3) After the coarse product of the lightweight aggregate is steamed under high pressure, the coarse product is cleaned by ethanol solution with the mass concentration of 5-20 percent and crushed to obtain the lightweight aggregate with the particle size of 5-20mm.
The porous core material has many pores, light weight and volume weight less than 1g/cm 3 The outer coating layer is coated to increase the mechanical strength, the lightweight aggregate is treated by adopting an autoclaved process, and the high-performance self-compacting concrete technology is matched, so that the weight of the concrete is reduced, the mechanical property and the durability of the concrete member are improved, the construction period is accelerated, the construction is convenient, the energy is saved, the environment is protected, the connection is firm, and the long-term property and the durability of the power calandria member are improvedThe purpose is.
Preferably, the water reducing agent can be a powder polycarboxylic acid water reducing agent, and the water reducing rate is more than 25%; and the defoaming agent is selected from an organic silicon defoaming agent, a polyether modified polysiloxane defoaming agent and the like, so that bubbles on the surface of the concrete are eliminated, and the mechanical property, the durability and the appearance of the concrete member are ensured.
A preparation process of light high-strength concrete for prefabricating power grid pipes comprises the following steps:
1) Weighing coarse aggregate, fine aggregate, light aggregate, cement, fly ash and mineral powder according to the weight ratio, mixing, adding water, and pre-stirring for 30s;
2) Adding a defoaming agent and a water reducing agent according to the weight ratio, controlling the water amount, and stirring for 60s;
3) And after concrete sampling detection, conveying the concrete to concrete pouring and concrete curing procedures.
Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:
1) The lightweight high-strength self-compacting concrete is adopted to treat the lightweight aggregate by adopting an autoclaved process, and the high-performance self-compacting concrete technology is matched, so that the weight of the concrete is reduced, and the mechanical property and the durability of a concrete member are improved; the apparent density of the prefabricated power calandria is less than or equal to 2000kg/m 3 The self weight of the light precast concrete power grid is reduced by 15-20% compared with that of common concrete, and the light precast concrete power grid is convenient to transport and install, saves energy and improves efficiency.
2) The invention has the advantages of simplified production process, simple construction process and ensured appearance quality, and the concrete adopts high-performance self-compacting concrete.
Detailed Description
Example 1: a light high-strength concrete for prefabricating electric power grid pipes is characterized in that each cubic concrete is composed of the following raw materials by weight: 300kg of yellow sand, 300kg of broken stone, 350kg of machine-made sand, 400kg of lightweight aggregate, 250kg of cement, 90kg of fly ash, 45kg of mineral powder, 7kg of defoaming agent, 8kg of water reducing agent and 120kg of water;
the fine aggregate is machine-made sand with the particle size of 2-5 mm; the machine-made sand is obtained by selecting natural sand with the particle size larger than 0.6mm through a sand making machine, and mixing and calcining the natural sand, lithium bentonite, glass fiber, limestone, water glass and water; the mass ratio of the natural sand to the lithium bentonite, the glass fiber, the limestone and the water glass is 100:5-20:2-10: 0.1-0.5; the lightweight aggregate comprises an inner framework and an outer coating, the inner framework is a porous core material, the porous core material comprises one or a combination of waste ceramics and pumice, the outer coating comprises waste concrete blocks, clay and glass fiber in parts by weight, and the mass ratio of the waste concrete blocks to the clay to the glass fiber is 100-30; wherein the glass fiber has a diameter of 50 to 100 μm.
Example 2: a light high-strength concrete for prefabricating electric power grid pipes is characterized in that each cubic concrete is composed of the following raw materials by weight: 400kg of yellow sand, 350kg of broken stone, 300kg of machine-made sand, 350kg of lightweight aggregate, 300kg of cement, 80kg of fly ash, 40kg of mineral powder, 6kg of defoaming agent, 9kg of water reducing agent and 140kg of water;
the fine aggregate is machine-made sand with the particle size of 2-5 mm; the machine-made sand is obtained by selecting natural sand with the particle size larger than 0.6mm through a sand making machine, and mixing and calcining the natural sand, lithium bentonite, glass fiber, limestone, water glass and water; the mass ratio of the natural sand to the lithium bentonite, the glass fiber, the limestone and the water glass is 100:5-20:2-10: 0.1-0.5; the lightweight aggregate comprises an inner framework and an outer coating, the inner framework is a porous core material, the porous core material comprises one or a combination of waste ceramics and pumice, the outer coating comprises waste concrete blocks, clay and glass fiber in parts by weight, and the mass ratio of the waste concrete blocks to the clay to the glass fiber is 100-30; wherein the glass fiber has a diameter of 50 to 100 μm.
Example 3: a light high-strength concrete for prefabricating electric power grid pipes is characterized in that each cubic concrete is composed of the following raw materials by weight: 450kg of yellow sand, 350kg of broken stone, 250kg of machine-made sand, 300kg of lightweight aggregate, 360kg of cement, 60kg of fly ash, 30kg of mineral powder, 7kg of defoaming agent, 10kg of water reducing agent and 160kg of water;
the fine aggregate is machine-made sand with the particle size of 2-5 mm; the machine-made sand is obtained by selecting natural sand with the particle size larger than 0.6mm through a sand making machine, and mixing and calcining the natural sand, lithium bentonite, glass fiber, limestone, water glass and water; the mass ratio of the natural sand to the lithium bentonite, the glass fiber, the limestone and the water glass is 100:5-20:2-10: 0.1-0.5; the lightweight aggregate comprises an inner framework and an outer coating, the inner framework is a porous core material, the porous core material comprises one or a combination of waste ceramics and pumice, the outer coating comprises waste concrete blocks, clay and glass fiber in parts by weight, and the mass ratio of the waste concrete blocks to the clay to the glass fiber is 100-30; wherein the glass fiber has a diameter of 50 to 100 μm.
The method of making the machine-made sand described in examples 1-3 includes the steps of: stir-frying natural sand until the temperature reaches 60 ℃, sequentially adding lithium bentonite, glass fiber, limestone and water glass for mixing, adding water for multiple times to prepare mortar with the water content of less than 5%, subpackaging, shaping and shaping the mortar into blocks, then transferring the blocks into a kiln for calcining for 1-3h, cooling and crushing the blocks to obtain machine-made sand with the particle size of 2-5 mm; wherein the calcining temperature is 1100-1200 ℃.
The preparation method of the lightweight aggregate comprises the following steps: 1) Crushing the porous core material to the particle size of less than 20mm, soaking in acid liquor for 1-3h, airing, then putting into a high-temperature furnace for roasting, and keeping the temperature of the porous core material at 100-120 ℃; 2) Melting the waste concrete blocks in a high-temperature furnace, quickly adding clay and glass fiber after the waste concrete blocks are completely melted, uniformly mixing, pouring into the porous core material, quickly turning over, and cooling to obtain a crude lightweight aggregate; 3) After the coarse product of the lightweight aggregate is steamed under high pressure, the coarse product is cleaned by ethanol solution with the mass concentration of 5-20 percent and crushed to obtain the lightweight aggregate with the particle size of 5-20mm.
Example 4: a preparation method of light high-strength concrete for prefabricating a power grid pipe comprises the following steps:
1) Respectively weighing coarse aggregate, fine aggregate, lightweight aggregate, cement, fly ash and mineral powder according to the weight ratio of the embodiment 1-3, mixing, adding water, and pre-stirring for 30s;
2) Adding a defoaming agent and a water reducing agent according to the weight ratio, controlling the water amount, and stirring for 60s;
3) And 2) after the mixed material is qualified through sampling detection, conveying the mixed material to concrete pouring and tamping and concrete curing procedures.
Precast concrete power pipes were prepared according to the preparation method of example 4 using the concrete formulations of examples 1-3, and the power pipes were tested, and the detailed data are shown in table 1:
TABLE 1
| Serial number | Detecting the index | Standard design requirements of enterprises | Tolerance deviation | Whether it reaches the standard |
| 1 | Apparent density of concrete | ≤2000kg/m 3 | ±2.0％ | Is that |
| 2 | Strength of resilience of concrete | C35 | ≥C35 | Is that |
| 3 | Concrete impermeability grade | ≥P6 | ≥P6 | Is that |
| 4 | Electric flux of concrete | Less than or equal to 2000 coulombs | Less than or equal to 2000 coulombs | Is that |
Through detection, the power grid obtained in the embodiment 1-3 reaches the enterprise standard in the aspects of concrete apparent density, concrete resilience strength, concrete impermeability grade and concrete electric flux; the power grid is prefabricated by adopting light high-strength self-compacting concrete and assembled on a construction site, so that the complex procedures caused by on-site cast-in-place concrete components are reduced, the cost is reduced, and the environment friendliness and energy conservation are facilitated; meanwhile, the weight of the power grid obtained in the embodiments 1-3 is reduced by 15-20% compared with that of common concrete, so that the power grid is convenient to transport and install, and is energy-saving and synergistic.
Claims (9)
1. The light high-strength concrete for prefabricating the power grid is characterized in that each cubic concrete consists of the following raw materials by weight:
600-950 kg of coarse aggregate;
250-400 kg of fine aggregate;
300-400 kg of lightweight aggregate;
250-360 kg of cement;
60-95 kg of fly ash;
30-50 kg of mineral powder;
5-7 kg of defoaming agent;
8-10 kg of water reducing agent;
120-160 kg of water.
2. A lightweight high strength concrete for prefabricated electric power gauntlets according to claim 1, characterized in that each cubic concrete consists of the following raw materials by weight:
750kg of coarse aggregate;
300kg of fine aggregate;
350kg of lightweight aggregate;
300kg of cement;
80kg of fly ash;
40kg of mineral powder;
6kg of defoaming agent;
9kg of water reducing agent;
140kg of water.
3. The lightweight high-strength concrete for prefabricated power pipes according to claim 2, characterized in that said coarse aggregate comprises yellow sand and crushed stone with a particle size of 5-20mm, wherein the mass ratio of yellow sand to crushed stone is 1-1.2.
4. The lightweight high strength concrete for prefabricated electric power gauntlets according to claim 1, characterized in that said fine aggregate is machine-made sand with a particle size of 2-5 mm; the machine-made sand is obtained by selecting natural sand with the particle size larger than 0.6mm through a sand making machine, and mixing and calcining the natural sand, lithium bentonite, glass fiber, limestone, water glass and water; the mass ratio of the natural sand to the lithium bentonite, the glass fiber, the limestone and the water glass is 100:5-20:2-10:0.1-0.5:1-5.
5. Light weight high strength concrete for prefabricated power pipes stacks according to claim 4, characterized in that the preparation method of said machine-made sand comprises the following steps: stir-frying natural sand until the temperature reaches 60 ℃, sequentially adding lithium bentonite, glass fiber, limestone and water glass for mixing, adding water for multiple times to prepare mortar with the water content of less than 5%, subpackaging, shaping and shaping the mortar into blocks, then transferring the blocks into a kiln for calcining for 1-3h, cooling and crushing the blocks to obtain machine-made sand with the particle size of 2-5 mm; wherein the calcining temperature is 1100-1200 ℃.
6. The lightweight high-strength concrete for prefabricating power pipes according to claim 5, wherein the lightweight aggregate comprises an inner skeleton and an outer coating layer, the inner skeleton is a porous core material, the porous core material comprises one or a combination of waste ceramics and pumice, and the outer coating layer comprises waste concrete blocks, clay and glass fibers in parts by weight, and the weight ratio of the waste concrete blocks to the clay to the glass fibers is 100-30; wherein the glass fiber has a diameter of 50 to 100 μm.
7. A lightweight high strength concrete for prefabrication of power pipes according to claim 6, characterized in that said lightweight aggregate is prepared by a method comprising the steps of:
1) Crushing the porous core material to the particle size of less than 20mm, soaking in acid liquor for 1-3h, airing, then putting into a high-temperature furnace for roasting, and keeping the temperature of the porous core material at 100-120 ℃;
2) Melting the waste concrete blocks in a high-temperature furnace, quickly adding clay and glass fiber after the waste concrete blocks are completely melted, uniformly mixing, pouring into the porous core material, quickly turning over, and cooling to obtain a crude lightweight aggregate;
3) After the coarse product of the lightweight aggregate is steamed under high pressure, the coarse product is cleaned by ethanol solution with the mass concentration of 5-20 percent and crushed to obtain the lightweight aggregate with the particle size of 5-20mm.
8. Light weight, high strength concrete for prefabricated electric power gauntlets according to claim 7, characterized in that said acid is dilute sulphuric acid, dilute hydrochloric acid or carbonic acid.
9. A preparation process of light high-strength concrete for prefabricating power grid pipes is characterized by comprising the following steps:
1) Weighing coarse aggregate, fine aggregate, light aggregate, cement, fly ash and mineral powder according to the weight ratio, mixing, adding water, and pre-stirring for 30s;
2) Adding a defoaming agent and a water reducing agent according to the weight ratio, controlling the water amount, and stirring for 60s;
3) And 2) after the mixed material is qualified through sampling detection, conveying the mixed material to concrete pouring and tamping and concrete curing procedures.
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| CN202211491009.8A CN115819020A (en) | 2022-11-25 | 2022-11-25 | Light high-strength concrete for prefabricating power grid and preparation process thereof |
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| CN202211491009.8A CN115819020A (en) | 2022-11-25 | 2022-11-25 | Light high-strength concrete for prefabricating power grid and preparation process thereof |
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