CN118026595A - Multi-performance composite concrete and method for manufacturing subway assembled evacuation platform by same - Google Patents
Multi-performance composite concrete and method for manufacturing subway assembled evacuation platform by same Download PDFInfo
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- CN118026595A CN118026595A CN202410145402.4A CN202410145402A CN118026595A CN 118026595 A CN118026595 A CN 118026595A CN 202410145402 A CN202410145402 A CN 202410145402A CN 118026595 A CN118026595 A CN 118026595A
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- 239000004567 concrete Substances 0.000 title claims abstract description 120
- 239000002131 composite material Substances 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000006004 Quartz sand Substances 0.000 claims abstract description 51
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000004568 cement Substances 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 28
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 24
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 23
- 239000011707 mineral Substances 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 239000003513 alkali Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 21
- 238000012360 testing method Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 15
- 238000012423 maintenance Methods 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 230000007613 environmental effect Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- 229920001410 Microfiber Polymers 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 239000007888 film coating Substances 0.000 claims description 5
- 238000009501 film coating Methods 0.000 claims description 5
- 238000007710 freezing Methods 0.000 claims description 5
- 230000008014 freezing Effects 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 230000010220 ion permeability Effects 0.000 claims description 5
- 239000003658 microfiber Substances 0.000 claims description 5
- 230000003020 moisturizing effect Effects 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000007306 turnover Effects 0.000 abstract description 2
- 239000011149 active material Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention relates to the technical field of constructional engineering concrete, in particular to a multi-performance composite concrete and a method for manufacturing a subway assembly type evacuation platform by using the same, wherein the method comprises the following steps: the multi-performance composite concrete comprises the following components in parts by mass: 600-750 parts of cement, 750-850 parts of quartz sand, 100-200 parts of silica fume, 20-80 parts of mineral powder, 20-80 parts of strength-promoting shrinkage-reducing agent, 100-150 parts of steel fiber and 20-35 parts of water reducer, wherein the cement is low-alkali P.O42.5 cement, and the silica fume and the mineral powder are active admixture; by adding the strength-promoting shrinkage-reducing agent, the steam curing temperature can be reduced, the energy consumption and the emission can be reduced, or the steam curing time can be reduced under the condition of not reducing the steam curing temperature, the turnover of the die can be quickened, the production efficiency can be improved, and the energy consumption and the emission can be reduced.
Description
Technical Field
The invention relates to the technical field of constructional engineering concrete, in particular to multi-performance composite concrete and a method for manufacturing a subway assembly type evacuation platform by using the same.
Background
The subway evacuation platform is mainly used for evacuating people and escaping after emergencies occur in the subway operation process, and plays an important role in ensuring the safety of the people. The evacuation platform is generally manufactured by adopting RPC concrete, the RPC concrete is prepared from cement, quartz sand, active powder, high-strength steel fibers and other materials, the strength, durability and toughness of the RPC concrete are lower than those of multi-performance composite concrete, in the method for manufacturing the subway evacuation platform by adopting the traditional RPC concrete, the traditional RPC concrete raw material mixing ratio often needs long-time steaming and pressing and a whole set of stirring equipment to manufacture the subway evacuation platform, and the method is long in time consumption, high in cost and difficult in construction.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a multi-performance composite concrete and a method for manufacturing a subway assembly type evacuation platform by using the same.
The invention adopts the following technical scheme to realize the aim: the multi-performance composite concrete comprises the following components in parts by mass: 600-750 parts of cement, 750-850 parts of quartz sand, 100-200 parts of silica fume, 20-80 parts of mineral powder, 20-80 parts of strength-promoting shrinkage-reducing agent, 100-150 parts of steel fiber and 20-35 parts of water reducer, wherein the cement is low-alkali P.O 42.5 cement, and the silica fume and the mineral powder are active admixture.
In particular, the quartz sand has the following composition: 1.21-0.63 mm thick-diameter quartz sand, 0.63-0.16 mm medium-diameter quartz sand and 0.315-0.16 mm thin-diameter quartz sand, wherein the weight ratio of the thick-diameter quartz sand to the medium-diameter quartz sand to the thin-diameter quartz sand is 3:4:3.
In particular, the strength-promoting shrinkage agent is CQJSJ-B type strength-promoting shrinkage agent, the specific surface area is more than or equal to 500m 2/kg, and the 28d compressive strength ratio is more than or equal to 105%.
Specifically, the steel fibers are high-strength microfibers having a length of 12mm to 16mm and a ratio of 90% or more, a diameter of 0.18mm to 0.22mm and a ratio of 96% or more, an average length of 14mm, and an average diameter of 0.20mm.
In particular, the water reducer is a polycarboxylic acid high-performance water reducer with the water reducing rate of more than 30 percent, and part of air entraining agent is added into the water reducer.
Particularly, the thickness of the subway fabricated evacuation platform manufactured by the multi-performance composite concrete is 50mm, the 28d compressive strength is more than or equal to 140Mpa, the flexural strength is more than or equal to 18Mpa, the elastic modulus is more than or equal to 40Gpa, the freezing resistance is more than or equal to F500, the chloride ion permeability Q is less than or equal to 100C, and the 300h compressive strength loss is less than or equal to 10%.
The method for manufacturing the subway assembled evacuation platform manufactured by the multi-performance composite concrete is characterized by comprising the following steps of:
(1) Weighing the required cement, quartz sand, silica fume, mineral powder, strength-promoting shrinkage-reducing dosage, steel fiber, water reducing agent, I-grade fly ash and S105 granulated blast furnace slag powder according to parts by weight for standby;
(2) Putting cement, quartz sand, silica fume, mineral powder, a strength-promoting shrinkage-reducing agent, I-grade fly ash and S105 granulated blast furnace slag powder into a stirrer, and pre-stirring the dry materials for 4min to uniformly mix the dry materials to obtain a mixture;
(3) Uniformly mixing water and a water reducing agent in a glass container to obtain a mixed solution;
(4) Adding 4/5 of the mixed solution into the mixture, and stirring for 2-4min;
(5) Adding the rest 1/5 of the mixed solution into the mixture, and stirring for 4-6min;
(6) Finally, adding steel fibers into the mixture, and stirring for 2-4min to obtain the multi-performance composite concrete;
(7) Assembling and placing the subway assembled evacuation platform die into a vibrating table, slowly and stably pouring uniformly mixed multi-performance composite concrete into the subway assembled evacuation platform die, and simultaneously forming a compression-resistant test piece of the multi-performance composite concrete;
(8) Removing redundant multi-performance composite concrete around the subway assembled evacuation platform, opening a vibrating table to perform compaction, and finally performing surface collecting, wherein the pouring of the multi-performance composite concrete poured subway assembled evacuation platform is completed;
(9) After the subway assembled evacuation platform with the multi-performance composite concrete pouring is molded, film coating, moisturizing and static-stop maintenance is carried out, the ambient temperature is kept above 10 ℃ during static stop, the relative humidity is kept above 60%, and the static-stop time is kept above 6 hours;
(10) Steam curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform after stopping, after the temperature is raised to 40 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 40+/-3 ℃ for 24 hours or until the compressive strength of a test piece under the same condition reaches 40Mpa, then the temperature is reduced to a temperature range that the difference between the surface temperature and the environmental temperature of the multi-performance composite concrete poured subway assembled evacuation platform is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and then primary curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform, wherein the environmental relative humidity in the primary curing process is maintained to be more than 70%;
(11) Removing the mold of the subway assembled evacuation platform poured by the multi-performance composite concrete after the initial maintenance is finished, wherein the difference between the surface temperature of a component and the ambient temperature during the mold removal is not more than 20 ℃;
(12) Steam curing is carried out again on the subway assembled evacuation platform poured by the multi-performance composite concrete after the mold is removed, after the temperature is raised to 70 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 70+/-5 ℃ for more than 24 hours, or the compressive strength value of a test piece under the same condition reaches a design value, then the temperature is reduced to a temperature range that the difference between the surface temperature of the subway assembled evacuation platform poured by the multi-performance composite concrete and the ambient temperature is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and the concrete surface is controlled not to be cracked or cracked rapidly in the cooling process, after the curing is finished, the heat preservation facility is withdrawn, and the ambient relative humidity in the final curing process is maintained at more than 95%;
(13) And (3) placing the final-cultured multi-performance composite concrete poured subway assembled evacuation platform in an environment with the temperature of more than 10 ℃ for natural maintenance, keeping the surface wet for at least 7d, and naturally maintaining the surface for 28d, wherein the manufacturing of the multi-performance composite concrete fabricated subway assembled evacuation platform is completed.
The beneficial effects of the invention are as follows:
(1) The invention adopts the strength-promoting shrinkage-reducing agent to reduce the Portland cement content to prepare low-cement, high-grade, low-hydration heat and low-shrinkage high-performance concrete, thereby reducing the cost of the concrete and reducing the later cracking of the concrete member; by adding the strength-promoting shrinkage-reducing agent, the steam curing temperature can be reduced, the energy consumption and the emission can be reduced, or the steam curing time can be reduced under the condition of not reducing the steam curing temperature, the turnover of the die can be quickened, the production efficiency can be improved, and the energy consumption and the emission can be reduced.
(2) The invention adopts superfine active materials such as silica fume, mineral powder and the like and aims at: the active material particles are very small, and small spherical silica powder is filled among cement particles, so that the cementing material has better grading, the bonding strength between cement paste and aggregate is improved, bleeding is reduced, moisture is prevented from condensing on the lower surface of the aggregate, the compactness of an interface transition area is improved, the thickness of the interface transition area is reduced, the silica fume has pozzolan activity as that of the class I fly ash, a large amount of amorphous silicon and superfine powder contained therein react with Ca (OH) 2 at the early stage of cement hydration to generate C-S-H gel, and the calcium-silicon ratio in concrete is reduced, so that the strength of the concrete can be effectively improved; the invention uses superfine active material and strength-promoting shrinkage-reducing agent to replace partial cement dosage to optimize cementing material in the mixing proportion, and carries out repeated test verification on three grain-grade aggregates to obtain the optimal grading proportion, thereby reducing the steam curing cost of the concrete and the shrinkage deformation of the concrete, and the breaking strength of the prepared multi-performance composite concrete can reach more than 24Mpa and the compressive strength of 145 Mpa.
(3) The purpose of the special polycarboxylic acid high-performance water reducer is as follows: the multi-performance composite concrete has the strength of more than 140Mpa, the concrete water gel is relatively low, and a special water reducer is needed. According to the test configuration, the polycarboxylic acid high-performance water reducer doped with the air entraining agent with proper doping amount can form a large number of tiny bubbles in the mixture, so that the ball effect is formed without reducing the friction force among aggregate particles, the fluidity of the concrete mixture is improved, and the water retention property and the cohesiveness are improved.
Detailed Description
The invention is further illustrated by the following examples:
Comparative examples
The multi-performance composite concrete comprises the following components in parts by mass: 727 parts of cement, 123 parts of silica fume, 42 parts of mineral powder, 782 parts of quartz sand, 127 parts of steel fiber, 135 parts of water and 28.4 parts of water reducer, wherein the cement is low-alkali P.O42.5 cement, and the silica fume and the mineral powder are active admixture.
In particular, the quartz sand has the following composition: 1.21-0.63 mm thick-diameter quartz sand, 0.63-0.16 mm medium-diameter quartz sand and 0.315-0.16 mm thin-diameter quartz sand, wherein the weight ratio of the thick-diameter quartz sand to the medium-diameter quartz sand to the thin-diameter quartz sand is 3:4:3.
Specifically, the steel fibers are high-strength microfibers having a length of 12mm to 16mm and a ratio of 90% or more, a diameter of 0.18mm to 0.22mm and a ratio of 96% or more, an average length of 14mm, and an average diameter of 0.20mm.
Particularly, the thickness of the subway fabricated evacuation platform manufactured by the multi-performance composite concrete is 50mm, the 28d compressive strength is more than or equal to 140Mpa, the flexural strength is more than or equal to 18Mpa, the elastic modulus is more than or equal to 40Gpa, the freezing resistance is more than or equal to F500, the chloride ion permeability Q is less than or equal to 100C, and the 300h compressive strength loss is less than or equal to 10%.
The method for manufacturing the subway assembled evacuation platform manufactured by the multi-performance composite concrete comprises the following steps:
(1) Weighing the required cement, quartz sand, silica fume, mineral powder, steel fiber and water reducer according to parts by weight for standby;
(2) Putting cement, quartz sand, silica fume, mineral powder and dry materials into a stirrer, and pre-stirring for 4min to uniformly mix the dry materials to obtain a mixture;
(3) Uniformly mixing water and a water reducing agent in a glass container to obtain a mixed solution;
(4) Adding 4/5 of the mixed solution into the mixture, and stirring for 2-4min;
(5) Adding the rest 1/5 of the mixed solution into the mixture, and stirring for 4-6min;
(6) Finally, adding steel fibers into the mixture, and stirring for 2-4min to obtain the multi-performance composite concrete;
(7) Assembling and placing the subway assembled evacuation platform die into a vibrating table, slowly and stably pouring uniformly mixed multi-performance composite concrete into the subway assembled evacuation platform die, and simultaneously forming a compression-resistant test piece of the multi-performance composite concrete;
(8) Removing redundant multi-performance composite concrete around the subway assembled evacuation platform, opening a vibrating table to perform compaction, and finally performing surface collecting, wherein the pouring of the multi-performance composite concrete poured subway assembled evacuation platform is completed;
(9) After the subway assembled evacuation platform with the multi-performance composite concrete pouring is molded, film coating, moisturizing and static-stop maintenance is carried out, the ambient temperature is kept above 10 ℃ during static stop, the relative humidity is kept above 60%, and the static-stop time is kept above 6 hours;
(10) Steam curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform after stopping, after the temperature is raised to 40 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 40+/-3 ℃ for 24 hours or until the compressive strength of a test piece under the same condition reaches 40Mpa, then the temperature is reduced to a temperature range that the difference between the surface temperature and the environmental temperature of the multi-performance composite concrete poured subway assembled evacuation platform is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and then primary curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform, wherein the environmental relative humidity in the primary curing process is maintained to be more than 70%;
(11) Removing the mold of the subway assembled evacuation platform poured by the multi-performance composite concrete after the initial maintenance is finished, wherein the difference between the surface temperature of a component and the ambient temperature during the mold removal is not more than 20 ℃;
(12) Steam curing is carried out again on the subway assembled evacuation platform poured by the multi-performance composite concrete after the mold is removed, after the temperature is raised to 70 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 70+/-5 ℃ for more than 24 hours, or the compressive strength value of a test piece under the same condition reaches a design value, then the temperature is reduced to a temperature range that the difference between the surface temperature of the subway assembled evacuation platform poured by the multi-performance composite concrete and the ambient temperature is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and the concrete surface is controlled not to be cracked or cracked rapidly in the cooling process, after the curing is finished, the heat preservation facility is withdrawn, and the ambient relative humidity in the final curing process is maintained at more than 95%;
(13) And (3) placing the final-cultured multi-performance composite concrete poured subway assembled evacuation platform in an environment with the temperature of more than 10 ℃ for natural maintenance, keeping the surface wet for at least 7d, and naturally maintaining the surface for 28d, wherein the manufacturing of the multi-performance composite concrete fabricated subway assembled evacuation platform is completed.
Example 1
The multi-performance composite concrete comprises the following components in parts by mass: 655 parts of cement, 153 parts of silica fume, 42 parts of mineral powder, 782 parts of quartz sand, 43 parts of strength-promoting shrinkage-reducing agent, 127 parts of steel fiber, 135 parts of water and 28.4 parts of water reducer, wherein the cement is low-alkali P.O42.5 cement, and the silica fume and the mineral powder are active admixture.
In particular, the quartz sand has the following composition: 1.21-0.63 mm thick-diameter quartz sand, 0.63-0.16 mm medium-diameter quartz sand and 0.315-0.16 mm thin-diameter quartz sand, wherein the weight ratio of the thick-diameter quartz sand to the medium-diameter quartz sand to the thin-diameter quartz sand is 3:4:3.
In particular, the strength-promoting shrinkage agent is CQJSJ-B type strength-promoting shrinkage agent, the specific surface area is more than or equal to 500m 2/kg, and the 28d compressive strength ratio is more than or equal to 105%.
Specifically, the steel fibers are high-strength microfibers having a length of 12mm to 16mm and a ratio of 90% or more, a diameter of 0.18mm to 0.22mm and a ratio of 96% or more, an average length of 14mm, and an average diameter of 0.20mm.
In particular, the water reducer is a polycarboxylic acid high-performance water reducer with the water reducing rate of more than 30 percent, and part of air entraining agent is added into the water reducer.
Particularly, the thickness of the subway fabricated evacuation platform manufactured by the multi-performance composite concrete is 50mm, the 28d compressive strength is more than or equal to 140Mpa, the flexural strength is more than or equal to 18Mpa, the elastic modulus is more than or equal to 40Gpa, the freezing resistance is more than or equal to F500, the chloride ion permeability Q is less than or equal to 100C, and the 300h compressive strength loss is less than or equal to 10%.
Example 2
The multi-performance composite concrete comprises the following components in parts by mass: 696 parts of cement, 176 parts of silica fume, 59 parts of mineral powder, 782 parts of quartz sand, 49 parts of strength-promoting shrinkage-reducing agent, 127 parts of steel fiber, 160 parts of water and 28.4 parts of water reducer, wherein the cement is low-alkali P.O 42.5 cement, and the silica fume and the mineral powder are active admixture.
In particular, the quartz sand has the following composition: 1.21-0.63 mm thick-diameter quartz sand, 0.63-0.16 mm medium-diameter quartz sand and 0.315-0.16 mm thin-diameter quartz sand, wherein the weight ratio of the thick-diameter quartz sand to the medium-diameter quartz sand to the thin-diameter quartz sand is 3:4:3.
In particular, the strength-promoting shrinkage agent is CQJSJ-B type strength-promoting shrinkage agent, the specific surface area is more than or equal to 500m 2, and the compression strength ratio per kg28d is more than or equal to 105%.
Specifically, the steel fibers are high-strength microfibers having a length of 12mm to 16mm and a ratio of 90% or more, a diameter of 0.18mm to 0.22mm and a ratio of 96% or more, an average length of 14mm, and an average diameter of 0.20mm.
In particular, the water reducer is a polycarboxylic acid high-performance water reducer with the water reducing rate of more than 30 percent, and part of air entraining agent is added into the water reducer.
Particularly, the thickness of the subway fabricated evacuation platform manufactured by the multi-performance composite concrete is 50mm, the 28d compressive strength is more than or equal to 140Mpa, the flexural strength is more than or equal to 18Mpa, the elastic modulus is more than or equal to 40Gpa, the freezing resistance is more than or equal to F500, the chloride ion permeability Q is less than or equal to 100C, and the 300h compressive strength loss is less than or equal to 10%.
A method for manufacturing a subway assembled evacuation platform by multi-performance composite concrete comprises the following steps:
(1) Weighing the required cement, quartz sand, silica fume, mineral powder, strength-promoting shrinkage-reducing dosage, steel fiber and water reducing agent according to parts by weight for standby;
(2) Adding cement, quartz sand, silica fume, mineral powder and strength-promoting shrinkage-reducing agent into a stirrer, and pre-stirring dry materials for 4min to uniformly mix the dry materials to obtain a mixture;
(3) Uniformly mixing water and a water reducing agent in a glass container to obtain a mixed solution;
(4) Adding 4/5 of the mixed solution into the mixture, and stirring for 2-4min;
(5) Adding the rest 1/5 of the mixed solution into the mixture, and stirring for 4-6min;
(6) Finally, adding steel fibers into the mixture, and stirring for 2-4min to obtain the multi-performance composite concrete;
(7) Assembling and placing the subway assembled evacuation platform die into a vibrating table, slowly and stably pouring uniformly mixed multi-performance composite concrete into the subway assembled evacuation platform die, and simultaneously forming a compression-resistant test piece of the multi-performance composite concrete;
(8) Removing redundant multi-performance composite concrete around the subway assembled evacuation platform, opening a vibrating table to perform compaction, and finally performing surface collecting, wherein the pouring of the multi-performance composite concrete poured subway assembled evacuation platform is completed;
(9) After the subway assembled evacuation platform with the multi-performance composite concrete pouring is molded, film coating, moisturizing and static-stop maintenance is carried out, the ambient temperature is kept above 10 ℃ during static stop, the relative humidity is kept above 60%, and the static-stop time is kept above 6 hours;
(10) Steam curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform after stopping, after the temperature is raised to 40 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 40+/-3 ℃ for 24 hours or until the compressive strength of a test piece under the same condition reaches 40Mpa, then the temperature is reduced to a temperature range that the difference between the surface temperature and the environmental temperature of the multi-performance composite concrete poured subway assembled evacuation platform is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and then primary curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform, wherein the environmental relative humidity in the primary curing process is maintained to be more than 70%;
(11) Removing the mold of the subway assembled evacuation platform poured by the multi-performance composite concrete after the initial maintenance is finished, wherein the difference between the surface temperature of a component and the ambient temperature during the mold removal is not more than 20 ℃;
(12) Steam curing is carried out again on the subway assembled evacuation platform poured by the multi-performance composite concrete after the mold is removed, after the temperature is raised to 70 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 70+/-5 ℃ for more than 24 hours, or the compressive strength value of a test piece under the same condition reaches a design value, then the temperature is reduced to a temperature range that the difference between the surface temperature of the subway assembled evacuation platform poured by the multi-performance composite concrete and the ambient temperature is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and the concrete surface is controlled not to be cracked or cracked rapidly in the cooling process, after the curing is finished, the heat preservation facility is withdrawn, and the ambient relative humidity in the final curing process is maintained at more than 95%;
(13) And (3) placing the final-cultured multi-performance composite concrete poured subway assembled evacuation platform in an environment with the temperature of more than 10 ℃ for natural maintenance, keeping the surface wet for at least 7d, and naturally maintaining the surface for 28d, wherein the manufacturing of the multi-performance composite concrete fabricated subway assembled evacuation platform is completed.
The subway assembly type evacuation platform manufactured by the multi-performance composite concrete in the embodiment 1-2 is manufactured by the following method:
(1) Weighing the required cement, quartz sand, silica fume, mineral powder, strength-promoting shrinkage-reducing dosage, steel fiber and water reducing agent according to parts by weight for standby;
(2) Adding cement, quartz sand, silica fume, mineral powder and strength-promoting shrinkage-reducing agent into a stirrer, and pre-stirring dry materials for 4min to uniformly mix the dry materials to obtain a mixture;
(3) Uniformly mixing water and a water reducing agent in a glass container to obtain a mixed solution;
(4) Adding 4/5 of the mixed solution into the mixture, and stirring for 2-4min;
(5) Adding the rest 1/5 of the mixed solution into the mixture, and stirring for 4-6min;
(6) Finally, adding steel fibers into the mixture, and stirring for 2-4min to obtain the multi-performance composite concrete;
(7) Assembling and placing the subway assembled evacuation platform die into a vibrating table, slowly and stably pouring uniformly mixed multi-performance composite concrete into the subway assembled evacuation platform die, and simultaneously forming a compression-resistant test piece of the multi-performance composite concrete;
(8) Removing redundant multi-performance composite concrete around the subway assembled evacuation platform, opening a vibrating table to perform compaction, and finally performing surface collecting, wherein the pouring of the multi-performance composite concrete poured subway assembled evacuation platform is completed;
(9) After the subway assembled evacuation platform with the multi-performance composite concrete pouring is molded, film coating, moisturizing and static-stop maintenance is carried out, the ambient temperature is kept above 10 ℃ during static stop, the relative humidity is kept above 60%, and the static-stop time is kept above 6 hours;
(10) Steam curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform after stopping, after the temperature is raised to 40 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 40+/-3 ℃ for 24 hours or until the compressive strength of a test piece under the same condition reaches 40Mpa, then the temperature is reduced to a temperature range that the difference between the surface temperature and the environmental temperature of the multi-performance composite concrete poured subway assembled evacuation platform is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and then primary curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform, wherein the environmental relative humidity in the primary curing process is maintained to be more than 70%;
(11) Removing the mold of the subway assembled evacuation platform poured by the multi-performance composite concrete after the initial maintenance is finished, wherein the difference between the surface temperature of a component and the ambient temperature during the mold removal is not more than 20 ℃;
(12) Steam curing is carried out again on the subway assembled evacuation platform poured by the multi-performance composite concrete after the mold is removed, after the temperature is raised to 70 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 70+/-5 ℃ for more than 24 hours, or the compressive strength value of a test piece under the same condition reaches a design value, then the temperature is reduced to a temperature range that the difference between the surface temperature of the subway assembled evacuation platform poured by the multi-performance composite concrete and the ambient temperature is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and the concrete surface is controlled not to be cracked or cracked rapidly in the cooling process, after the curing is finished, the heat preservation facility is withdrawn, and the ambient relative humidity in the final curing process is maintained at more than 95%;
(13) And (3) placing the final-cultured multi-performance composite concrete poured subway assembled evacuation platform in an environment with the temperature of more than 10 ℃ for natural maintenance, keeping the surface wet for at least 7d, and naturally maintaining the surface for 28d, wherein the manufacturing of the multi-performance composite concrete fabricated subway assembled evacuation platform is completed.
For one of the above comparative examples and examples 1 and 2, the detection was performed according to the relevant standard specification, and the data are summarized as follows:
Compared with the comparative example, the subway assembly type evacuation platform prepared by adopting the multi-performance composite concrete has better compressive strength and appearance quality, has small difference in strength and fluidity according to different weight parts of the used materials, can meet the requirements in other bid-making, and has higher practical value.
While the invention has been described above by way of example, it will be apparent that the invention is not limited to the above embodiments, but is intended to be within the scope of the invention, as long as various modifications of the method concepts and technical solutions of the invention are adopted, or as long as modifications are directly applicable to other applications without modification.
Claims (7)
1. The multi-performance composite concrete is characterized by comprising the following components in parts by mass: 600-750 parts of cement, 750-850 parts of quartz sand, 100-200 parts of silica fume, 20-80 parts of mineral powder, 20-80 parts of strength-promoting shrinkage-reducing agent, 100-150 parts of steel fiber and 20-35 parts of water reducer, wherein the cement is low-alkali P.O 42.5 cement, and the silica fume and the mineral powder are active admixture.
2. The multi-performance composite concrete of claim 1, wherein the silica sand has the following composition: 1.21-0.63 mm thick-diameter quartz sand, 0.63-0.16 mm medium-diameter quartz sand and 0.315-0.16 mm thin-diameter quartz sand, wherein the weight ratio of the thick-diameter quartz sand to the medium-diameter quartz sand to the thin-diameter quartz sand is 3:4:3.
3. The multi-performance composite concrete according to claim 1, wherein the strength-improving shrinkage-reducing agent is CQJSJ-B type strength-improving shrinkage-reducing agent, the specific surface area is not less than 500m 2/kg, and the 28d compressive strength ratio is not less than 105%.
4. The multi-performance composite concrete according to claim 1, wherein the steel fibers are high-strength microfibers having a length of 12mm to 16mm in a ratio of 90% or more, a diameter of 0.18mm to 0.22mm in a ratio of 96% or more, an average length of 14mm, and an average diameter of 0.20mm.
5. The multi-performance composite concrete according to claim 1, wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent with a water reducing rate of more than 30%, and a part of air entraining agent is added into the water reducing agent.
6. The subway assembled evacuation platform manufactured by the multi-performance composite concrete is characterized in that the thickness of the subway assembled evacuation platform manufactured by the multi-performance composite concrete is 50mm,28d compressive strength is more than or equal to 140Mpa, flexural strength is more than or equal to 18Mpa, elastic modulus is more than or equal to 40Gpa, freezing resistance is more than or equal to F500, chloride ion permeability Q is less than or equal to 100C, and 300h compressive strength loss is less than or equal to 10%.
7. A method for manufacturing the subway assembled evacuation platform manufactured by the multi-performance composite concrete according to claim 6, which is characterized by comprising the following steps:
(1) Weighing the required cement, quartz sand, silica fume, mineral powder, strength-promoting shrinkage-reducing dosage, steel fiber and water reducing agent according to parts by weight for standby;
(2) Adding cement, quartz sand, silica fume, mineral powder and strength-promoting shrinkage-reducing agent into a stirrer, and pre-stirring dry materials for 4min to uniformly mix the dry materials to obtain a mixture;
(3) Uniformly mixing water and a water reducing agent in a glass container to obtain a mixed solution;
(4) Adding 4/5 of the mixed solution into the mixture, and stirring for 2-4min;
(5) Adding the rest 1/5 of the mixed solution into the mixture, and stirring for 4-6min;
(6) Finally, adding steel fibers into the mixture, and stirring for 2-4min to obtain the multi-performance composite concrete;
(7) Assembling and placing the subway assembled evacuation platform die into a vibrating table, slowly and stably pouring uniformly mixed multi-performance composite concrete into the subway assembled evacuation platform die, and simultaneously forming a compression-resistant test piece of the multi-performance composite concrete;
(8) Removing redundant multi-performance composite concrete around the subway assembled evacuation platform, opening a vibrating table to perform compaction, and finally performing surface collecting, wherein the pouring of the multi-performance composite concrete poured subway assembled evacuation platform is completed;
(9) After the subway assembled evacuation platform with the multi-performance composite concrete pouring is molded, film coating, moisturizing and static-stop maintenance is carried out, the ambient temperature is kept above 10 ℃ during static stop, the relative humidity is kept above 60%, and the static-stop time is kept above 6 hours;
(10) Steam curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform after stopping, after the temperature is raised to 40 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 40+/-3 ℃ for 24 hours or until the compressive strength of a test piece under the same condition reaches 40Mpa, then the temperature is reduced to a temperature range that the difference between the surface temperature and the environmental temperature of the multi-performance composite concrete poured subway assembled evacuation platform is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and then primary curing is carried out on the multi-performance composite concrete poured subway assembled evacuation platform, wherein the environmental relative humidity in the primary curing process is maintained to be more than 70%;
(11) Removing the mold of the subway assembled evacuation platform poured by the multi-performance composite concrete after the initial maintenance is finished, wherein the difference between the surface temperature of a component and the ambient temperature during the mold removal is not more than 20 ℃;
(12) Steam curing is carried out again on the subway assembled evacuation platform poured by the multi-performance composite concrete after the mold is removed, after the temperature is raised to 70 ℃ at a heating rate of not more than 12 ℃/h, the constant temperature is maintained at 70+/-5 ℃ for more than 24 hours, or the compressive strength value of a test piece under the same condition reaches a design value, then the temperature is reduced to a temperature range that the difference between the surface temperature of the subway assembled evacuation platform poured by the multi-performance composite concrete and the ambient temperature is not more than 20 ℃ at a cooling rate of not more than 15 ℃/h, and the concrete surface is controlled not to be cracked or cracked rapidly in the cooling process, after the curing is finished, the heat preservation facility is withdrawn, and the ambient relative humidity in the final curing process is maintained at more than 95%;
(13) And (3) placing the final-cultured multi-performance composite concrete poured subway assembled evacuation platform in an environment with the temperature of more than 10 ℃ for natural maintenance, keeping the surface wet for at least 7d, and naturally maintaining the surface for 28d, wherein the manufacturing of the multi-performance composite concrete fabricated subway assembled evacuation platform is completed.
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