CN109437700B - Unpowered-transportation self-compacting concrete and application thereof - Google Patents
Unpowered-transportation self-compacting concrete and application thereof Download PDFInfo
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- CN109437700B CN109437700B CN201811567339.4A CN201811567339A CN109437700B CN 109437700 B CN109437700 B CN 109437700B CN 201811567339 A CN201811567339 A CN 201811567339A CN 109437700 B CN109437700 B CN 109437700B
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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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/09—Ballastless systems
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Abstract
The invention discloses a self-compacting concrete for unpowered transportation, which comprises the following components in parts by weight: cement: 80-120 parts of fly ash: 30-50 parts of mineral powder: 10-30 parts of silica fume: 2-5 parts of diatomite: 0.05-0.5 parts of nano calcium carbonate powder: 0.02-0.1 part of fine aggregate: 200-300 parts of coarse aggregate: 250-350, swelling agent: 10-25 parts of a water reducing agent: 1.0-3.5 parts of retarder: 0.1-1 part of rheological additive: 0.01-0.05 part of defoaming agent: 0.001-0.003 parts of water: 50-80 parts. This newly mix self-compaction concrete is in transportation, the work progress, need not power and continuously stirs, can not take place to educe and bleed because of fortune utensil, environmental vibrations, leads to the pouring difficulty, can be used to the filling material between track board and the bottom plate among high-speed railway, the board-like ballastless track structure of subway, also can be used to the filling material between switch board and the bottom plate among the switch structure, especially is applicable to wherein difficult stirring that provides during transportation such as tunnel, bridge, and needs the occasion of long distance transportation.
Description
Technical Field
The invention relates to unpowered transported self-compacting concrete and application thereof, belonging to the technical field of plate-type ballastless track building materials.
Background
In recent years, rail transit represented by high-speed railways and subways is rapidly developed in the whole world, particularly in China, by 3 months in 2018, the operating mileage of the high-speed railways in China is 2.5 km ten thousand, and the urban subways are 0.53 km ten thousand, and according to planning, by 2020, the high-speed railways in China are built by 3 km and the newly increased subways are 0.3 km. In rail traffic of high-speed railways, subways and the like, a considerable number of lines adopt plate-type ballastless track structures, in the track structures, the height of a track plate is determined, errors of the height of a bottom plate in construction cannot be avoided, and as the high-speed railways and the subways need to have higher smoothness, filling layers are designed for later leveling and error elimination.
The cement emulsified asphalt mortar is used as the filling material between the track slab and the bottom slab at the earliest time, one of the disadvantages is that the construction difficulty is higher, and the quality of construction operation has serious influence on the quality of a filling layer. If the I-type cement emulsified asphalt mortar is constructed by adopting a bag injection method, a filling bag needs to be laid during construction, the opening of the filling bag needs to be cut after the construction is finished, in addition, special machines and tools need to be adopted for mortar filling, and the filling speed seriously influences the mortar quality. In addition, the mortar I and the mortar II are prepared by adopting a special stirring machine and stirring through a special stirring process, the process is complex, and the quality is extremely difficult to control. Moreover, the cost of the cement emulsified asphalt mortar is too high and is about 10 times of that of common concrete, each mortar mixer has a very low price which can reach millions of yuan, and the processing, labor and equipment costs (the construction speed is only 300 meters per day per working face) of special machines and tools are high during construction.
Therefore, it is necessary to develop materials with simple construction process, easily controlled construction quality and low cost to replace cement emulsified asphalt mortar. The self-compacting concrete has the advantages of large flow state, self-compacting, low cost and the like, and can meet the self-leveling requirement in the construction of the plate-type ballastless Track of the high-speed Railway, so that China autonomously develops a CRTS (China Railway Rail Track) III plate-type ballastless Track complete technology, adjusts the structure and then uses the adjusted structure in urban rail transit such as subways, tramways and the like, wherein the adoption of the self-compacting concrete to replace cement emulsified asphalt mortar is one of the core inventions. However, in construction, it is found that in the case of transportation in tunnels, bridges and the like, where stirring power is difficult to provide, after freshly-mixed self-compacting concrete is bumped in a hopper for a long distance, the concrete has large-area segregation, laitance and stone subsidence phenomena, which are particularly prominent in narrow and small single-line tunnels represented by subways. Because the subway space limits that it is impossible to equip a conveyer with stirring, and the distance between subway feed openings is very long, the transport distance often reaches more than 10km, the freshly-mixed self-compacting concrete is very easy to layer under the condition of no stirring, and the development of the unpowered-transported ultrahigh-stability self-compacting concrete is urgently needed.
Disclosure of Invention
In view of the defects of the prior art, the first object of the invention is to provide a self-compacting concrete for unpowered transportation, which has the characteristics of large flow state, self-compaction, low shrinkage, ultrahigh stability, no need of stirring during transportation and the like.
The second purpose of the invention is to provide the application of the unpowered self-compacting concrete in slab ballastless tracks.
In order to achieve the above object, the present invention provides a solution,
the invention relates to unpowered transport self-compacting concrete which comprises the following components in parts by weight:
cement: 80-120 parts of fly ash: 30-50 parts of mineral powder: 10-30 parts of silica fume: 2-5 parts of diatomite: 0.05-0.5 parts of nano calcium carbonate powder: 0.02-0.1 part of fine aggregate: 200-300 parts of coarse aggregate: 250-350, swelling agent: 10-25 parts of a water reducing agent: 1.0-3.5 parts of retarder: 0.1-1 part of rheological additive: 0.01-0.05 part of defoaming agent: 0.001-0.003 parts of water: 50-80 parts.
In a preferred scheme, the unpowered transport self-compacting concrete comprises the following components in parts by weight:
cement: 95-105 parts of fly ash: 30-40 parts of mineral powder: 15-25 parts of silica fume: 3-5 parts of diatomite: 0.1-0.5 parts of nano calcium carbonate powder: 0.03-0.08 parts of fine aggregate: 220-280 parts of coarse aggregate: 260-300, an expanding agent: 10-20 parts of a water reducing agent: 2-3.4 parts of retarder: 0.1-0.5 parts of rheological additive: 0.01-0.03 parts of defoaming agent: 0.001-0.002 parts of water: 50-60 parts.
As further optimization, the unpowered transport self-compacting concrete comprises the following components in parts by weight:
cement: 100 parts of fly ash: 30-35 parts of mineral powder: 15-20 parts of silica fume: 3-5 parts of diatomite: 0.2-0.5 parts of nano calcium carbonate powder: 0.03-0.05 part of fine aggregate: 260-265 parts of coarse aggregate: 275 to 280 parts by weight of an expanding agent: 10-12 parts of a water reducing agent: 2.7-3.4 parts of retarder: 0.1 part, rheological additive: 0.02 part, defoaming agent: 0.001 part, water: 56-58 parts.
Aiming at the problems that the self-compacting concrete in the prior art can have large-area segregation, laitance and stone subsidence under the condition of no stirring, the invention initially obtains the self-compacting concrete which has good segregation resistance under a large flow state by adjusting the components of the self-compacting concrete, effectively prevents the problems of laitance, layering, stone subsidence and the like of newly-stirred self-compacting concrete and is suitable for unpowered transportation.
In the invention, a certain amount of diatomite is doped, and the diatomite is aqueous amorphous SiO2The concrete has the advantages of porosity, low density, super large specific surface area and strong adsorbability, can realize physical thickening of slurry by utilizing the porosity, can effectively support stones to prevent the stones from sinking by utilizing the characteristics of low density and strong adsorbability, is not easy to delaminate during transportation, has certain reactivity, and can effectively improve the strength and durability of the concrete.
Meanwhile, the rheological additive is added into the formula, is a thixotropic substance, and can adjust the yield shear force, viscosity, pseudoplastic time and the like of the slurry, so that the concrete has good segregation resistance under a large flow state, and the problems of laitance, delamination and the like of newly-mixed self-compacting concrete are effectively prevented.
In addition, the nanometer calcium carbonate powder is added, the crystal structure and the surface electronic structure of the nanometer calcium carbonate are changed by utilizing the superfine of the nanometer calcium carbonate particles, and the quantum size effect, the small size effect, the surface effect, the macroscopic quantum effect and the steric hindrance effect which are not possessed by the common calcium carbonate are generated, so that the components with higher density in the concrete can be suspended, the thixotropy of a system is endowed, the coagulation and depolymerization structures of the fresh concrete structure are realized, the ultra-stability of the concrete is ensured, the adhesion of the concrete, the washing resistance and the stain resistance can be obviously improved, and the strength and the durability are improved.
It can be seen that the invention adds a plurality of substances, under the synergistic action of them, can prevent the stone from sinking, suspend the components with large density, and increase the anti-segregation ability, so that the invention can still maintain the performance of the concrete under the condition of no power and no bumping through long-distance transportation, and ensure that the problems of floating slurry, layering and the like do not occur.
The formula of the concrete of the invention also improves the performances of the concrete in various aspects such as self-compaction, strength, compactness, impermeability, crack resistance durability and the like through the synergistic effect of the components.
In a preferred embodiment, the diatomaceous earth has SiO therein2The content is more than or equal to 85 percent, and the surface area is more than or equal to 25000m2/kg。
The diatomite is formed by silicate remains after death of diatom unicellular algae, and is prepared by crushing, sorting, calcining, airflow grading, impurity removal and other processing of raw soil.
In a preferred embodiment, the rheological aid is at least one selected from the group consisting of sodium carboxymethylcellulose, carboxymethylcellulose ether, carboxyethyl cellulose, aqueous polyurethane emulsion, aqueous polyamide emulsion, and polyvinyl alcohol.
In a preferable scheme, the particle size of the nano calcium carbonate powder is less than or equal to 0.1 mu m.
Preferably, the cement is selected from silicate cement with 28d strength of more than 42.5MPa, and the alkali content of the silicate cement is less than 0.6 percent, and the chloride ion content is less than 0.06 percent.
The selected cement in the invention is silicate series cement with the strength grade of 42.5 or above sold on the market, and as the most main cementing material of concrete, the cement can effectively provide the strength and durability of concrete and ensure the casting and hardening performance of the concrete.
In the preferred scheme, the quality grade of the fly ash is grade I, the CaO content of the fly ash is more than or equal to 7 percent, the activity index of the fly ash is more than or equal to 80 percent, and the water demand ratio of the fly ash is less than or equal to 90 percent.
A certain amount of class I fly ash is added, the fly ash is fine ash captured from flue gas after electric field fire coal is combusted, the main component is high-temperature instant-cooling vitrified micro-beads, the roller bearing and lubricating effects are achieved, the water consumption of concrete can be effectively reduced, and the drying shrinkage of the concrete is further reduced; the density of the concrete is less than that of cement, and the specific surface area of the concrete is larger than that of the cement, so that the concrete has better suspension capacity and can effectively inhibit the bleeding of concrete; meanwhile, the volcanic ash effect and the dense filling effect can reduce the permeability coefficient of the concrete, improve the durability of the concrete, and inhibit the generation of alkali aggregate reaction and the like.
In a preferred scheme, the quality grade of the ore powder is more than S95 grade, the content of active oxides is more than or equal to 40 percent, and the water demand ratio is less than or equal to 85 percent.
The invention adopts high-quality mineral powder, can effectively improve the compressive strength of concrete and reduce the cost of the concrete, and simultaneously inhibits the reaction of alkali aggregate, reduces hydration heat, reduces early temperature cracks of a concrete structure, improves the compactness of the concrete, and effectively reduces the concrete Ca (OH) by utilizing the secondary hydration of the mineral powder2Content, and improved anti-seepage and anti-erosion ability.
In the preferred scheme, the surface area of the micro silicon powder is more than or equal to 20000m2Per kg, the activity index is more than or equal to 110 percent.
The micro silicon powder is a large amount of volatile SiO generated in a thermoelectric furnace in the process of smelting ferrosilicon and industrial silicon (metal silicon) in an iron alloy factory2And the product of Si gas after oxidation, condensation and precipitation, the invention selects the silica fume with super large specific surface area, which can realize the physical thickening and tackifying functions of concrete, thereby inhibiting the concrete bleeding; and takes advantage of its high reactivity, of which SiO2Can react with Ca (OH)2Secondary hydration is carried out to form compact C-S-H gel, so that the compactness, impermeability and durability of the concrete can be improved, the early strength of the self-compacting concrete can be effectively improved, and the turnover speed and construction speed of a mold on site are increased.
In a preferred scheme, the fine aggregate is selected from river sand or machine-made sand, the fineness modulus is 2.5-4.0, and the powder content is 2% -8%.
In a preferable scheme, the coarse aggregate is at least one selected from limestone and basalt with the particle size of less than or equal to 16mm, wherein the mass fraction of the coarse aggregate with the particle size of 10-16 mm is more than or equal to 20%, and the sphericity coefficient of the coarse aggregate is more than or equal to 0.85.
In the invention, by optimizing the grain composition of the coarse and fine aggregates, the content of stones with the grain diameter of 10-16 mm in the aggregates is particularly controlled, the self-compaction and reinforcing steel bar permeability of the concrete are improved, meanwhile, the maximum compaction and accumulation among the grains are achieved, and the volume stability of the concrete is improved.
Preferably, the expanding agent is a mixture consisting of scale-shaped aluminum powder and at least one of calcium sulphoaluminate, calcium oxide and magnesium oxide, wherein 1 part of the expanding agent contains 0.0001-0.0005 part of scale-shaped aluminum powder; the fineness of the scale-shaped aluminum powder is more than or equal to 250 meshes.
According to the invention, the degree of fullness of concrete can be effectively improved by reasonably controlling the fineness and the content of the aluminum powder in the expanding agent, and the purpose of compensating shrinkage is achieved.
In a preferred scheme, the water reducing agent is an ester polycarboxylate water reducing agent, wherein the water reducing rate is more than or equal to 30%, and the solid content is more than or equal to 20%.
The water reducing agent used in the invention is a commercially available ester polycarboxylate water reducing agent which has certain air entraining capacity, and the water reducing agent achieves the purposes of reducing shrinkage, preventing cracking and improving impermeability by doping special inorganic salt and interfering the formation of cement hydrate.
In a preferred scheme, the retarder is a slow release type retarder, and the slow release type retarder is selected from at least one of emulsified sodium gluconate, calcium gluconate and calcium lignosulfonate.
The retarder is added in the invention, the surface of the traditional water reducing agent is coated with slow soluble calcium salt by adopting an emulsification technology, and the retarder is continuously supplemented into concrete by slowly dissolving the calcium salt at the later stage, so that the slump constant of freshly-mixed self-compacting concrete is not lost, and the construction time of the concrete is ensured.
Preferably, the defoaming agent is selected from silicone defoaming agents, and the main component of the silicone defoaming agent is polyether-siloxane copolymer.
The invention adopts the organic silicon defoaming agent technology, the defoaming agent still has higher defoaming capability in a strong alkaline environment, the floating foam on the surface of newly-mixed self-compacting concrete can be effectively reduced, and the content of the introduced bubbles in the stirring and pumping process of the self-compacting concrete can be reduced.
The invention relates to unpowered transport self-compacting concrete, which is prepared by mixing and stirring cement, fly ash, mineral powder, micro silicon powder, diatomite, nano calcium carbonate powder, fine aggregate, coarse aggregate, an expanding agent, a water reducing agent, a retarder, a rheological additive, a defoaming agent and water.
The invention relates to application of unpowered transported self-compacting concrete, which is applied to a filling material between a track plate and a bottom plate of a ballastless track.
The ballastless track is a high-speed railway or a subway plate ballastless track.
The invention relates to application of unpowered transported self-compacting concrete, which is applied to a filling material between a turnout plate and a bottom plate in a turnout structure.
The unpowered self-compacting concrete can realize unpowered transportation, and is particularly suitable for occasions where stirring is difficult to provide during transportation of tunnels, bridges and the like and long-distance transportation is needed.
The principle and advantages of the invention are as follows:
aiming at the problems that the self-compacting concrete in the prior art can have large-area segregation, laitance and stone subsidence under the condition of no stirring, the invention initially obtains the self-compacting concrete which has good segregation resistance under a large flow state by adjusting the components of the self-compacting concrete, effectively prevents the problems of laitance, layering, stone subsidence and the like of newly-stirred self-compacting concrete and is suitable for unpowered transportation.
According to the invention, through the synergistic effect of the components, the stone sinking prevention, the suspension of the components with large density and the increase of the segregation resistance can be realized, so that the performance of the concrete can be still maintained under the condition of no power and no bumping through long-distance transportation, and the problems of slurry floating, layering and the like are avoided.
Meanwhile, the formula of the concrete improves the performances of the concrete in various aspects such as self-compaction, strength, compactness, impermeability, crack resistance durability and the like through the synergistic effect of the components.
The invention provides the unpowered self-compacting concrete for initially providing the unpowered self-compacting concrete, which is the unpowered ultrahigh-stability self-compacting concrete for the construction of occasions which are difficult to stir during transportation of tunnels, bridges and the like and need long-distance transportation. Has great industrial significance.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the following examples.
Example 1:
the self-compacting concrete for the slab ballastless track is prepared by mixing and stirring cement, fly ash, mineral powder, micro silicon powder (silica fume), diatomite, nano calcium carbonate powder, fine aggregate, coarse aggregate, an expanding agent, a water reducing agent, a retarder, a rheological aid, a defoaming agent and water. The weight parts of each component are as follows:
100 portions of cement and 30 portions of fly ash
20 parts of mineral powder and 3 parts of silica fume
0.2 part of diatomite and 0.05 part of nano calcium carbonate
265 parts of fine aggregate and 275 parts of coarse aggregate
10 parts of expanding agent and 2.8 parts of water reducing agent
0.1 part of retarder, 0.02 part of rheological additive
0.001 part of defoaming agent and 56 parts of water,
wherein the diatomaceous earth has a specific surface area of 27000m2Per kg, the average particle diameter of the nano calcium carbonate powder is 80nm, and the specific surface area of the micro silicon powder is 21000m2The fine aggregate is river sand, the coarse aggregate is limestone, the mass fraction of the coarse aggregate with the particle size of 10-16 mm is mainly 25%, the expanding agent is a mixture consisting of scale-shaped aluminum powder and calcium sulphoaluminate, 1 part of the expanding agent contains 0.0002 part of the scale-shaped aluminum powder, and the average fineness of the scale-shaped aluminum powder is 300 meshes. The rheological additive is sodium carboxymethylcellulose, and the retarder is emulsified sodium gluconate.
The performance indexes of the fresh concrete are as follows: the time required for the slump cone to expand to 500mm is 4.2s, the expansion degree is 680mm, the height difference of a J ring is 12mm, the time of an L instrument is 9s, the height ratio of two sides of the L instrument is 0.92, and the slump cone is freshly stirredPutting the concrete into a 10L capacity barrel, and putting the barrel on a vibration table to vibrate for 10 times, wherein the concrete can still be completely poured out; the performance indexes of the hardened concrete are as follows: 3d compressive strength of 18.0MPa, 28d compressive strength of 47.0MPa, 56d electric flux of 425 coulombs, freeze-thaw resistant cycle times of 300 times, and 56d drying shrinkage value of 350 multiplied by 10-6。
From the performance indexes, the unpowered self-compacting concrete for transportation has excellent segregation resistance, so that the performance of the freshly mixed self-compacting concrete can be maintained under the condition of unpowered long-distance transportation.
Example 2:
the self-compacting concrete for the slab ballastless track is prepared by mixing and stirring cement, fly ash, mineral powder, micro silicon powder (silica fume), diatomite, nano calcium carbonate powder, fine aggregate, coarse aggregate, an expanding agent, a water reducing agent, a retarder, a rheological aid, a defoaming agent and water. The weight parts of each component are as follows:
cement 100 parts fly ash 35 parts
15 parts of mineral powder and 5 parts of silica fume
0.3 part of diatomite and 0.03 part of nano calcium carbonate
260 parts of fine aggregate and 280 parts of coarse aggregate
12 parts of expanding agent and 2.7 parts of water reducing agent
0.1 part of retarder, 0.02 part of rheological additive
Defoaming agent 0.001 parts water 58 parts
Wherein the diatomaceous earth has a specific surface area of 25000m2Per kg, the average particle size of the nano calcium carbonate powder is 60nm, and the specific surface area of the micro silicon powder is 20000m2The expanded aggregate is prepared from limestone, wherein the mass fraction of the coarse aggregate with the particle size of 10-16 mm is 30%, the expanding agent is a mixture consisting of scale-shaped aluminum powder and calcium oxide, 1 part of the expanding agent contains 0.0003 part of the scale-shaped aluminum powder, and the average fineness of the scale-shaped aluminum powder is 350 meshes. The rheological additive is aqueous polyurethane emulsion, and the retarder is calcium gluconate.
The performance indexes of the fresh concrete are as follows: the time required for the slump cone to expand to 500mm is 3.8s, and the expansion degree is670mm, the height difference of the J ring is 11mm, the time of the L instrument is 8s, the height ratio of two sides of the L instrument is 0.92, the fresh concrete is filled into a 10L-volume barrel and placed on a vibration table to vibrate for 10 times, and the concrete can still be completely poured out; the performance indexes of the hardened concrete are as follows: 3d compressive strength of 20.2MPa, 28d compressive strength of 48.4MPa, 56d electric flux of 325 coulombs, freeze-thaw resistant cycle times of 300 times, and 56d drying shrinkage value of 320 multiplied by 10-6。
From the performance indexes, the unpowered self-compacting concrete for transportation has excellent segregation resistance, so that the performance of the freshly mixed self-compacting concrete can be maintained under the condition of unpowered long-distance transportation.
Example 3:
the self-compacting concrete for the slab ballastless track is prepared by mixing and stirring cement, fly ash, mineral powder, micro silicon powder, diatomite, nano calcium carbonate powder, fine aggregate, coarse aggregate, an expanding agent, a water reducing agent, a retarder, a rheological additive, a defoaming agent and water. The weight parts of each component are as follows:
cement 100 parts fly ash 35 parts
20 parts of mineral powder and 5 parts of silica fume
0.5 part of diatomite and 0.05 part of nano calcium carbonate
260 parts of fine aggregate and 280 parts of coarse aggregate
12 portions of expanding agent and 3.4 portions of water reducing agent
0.1 part of retarder, 0.02 part of rheological additive
Defoaming agent 0.001 parts water 56 parts
Wherein the diatomaceous earth has a specific surface area of 30000m2Per kg, the average particle size of the nano calcium carbonate powder is 50nm, and the specific surface area of the micro silicon powder is 25000m2The expanded aggregate is prepared from limestone, wherein the mass fraction of the coarse aggregate with the particle size of 10-16 mm is 20%, the expanding agent is a mixture consisting of scale-shaped aluminum powder and magnesium oxide, 1 part of the expanding agent contains 0.0004 part of the scale-shaped aluminum powder, and the average fineness of the scale-shaped aluminum powder is 400 meshes. The rheological additive is aqueous polyurethane emulsion, and the retarder is calcium lignosulfonate.
The performance indexes of the fresh concrete are as follows: the time required for expanding the slump cone to 500mm is 4.8s, the expansion degree is 680mm, the height difference of a J ring is 9mm, the time of an L instrument is 12s, the height ratio of two sides of the L instrument is 0.94, fresh concrete is filled into a 10L capacity barrel and is placed on a vibration table to vibrate for 10 times, and the concrete can still be completely poured out; the performance indexes of the hardened concrete are as follows: 22.5MPa of 3d compressive strength, 50.4MPa of 28d compressive strength, 280 coulombs of 56d electric flux, 400 times of freeze-thaw cycle resistance and 300 multiplied by 10 of 56d drying shrinkage value-6。
From the performance indexes, the unpowered self-compacting concrete for transportation has excellent segregation resistance, so that the performance of the freshly mixed self-compacting concrete can be maintained under the condition of unpowered long-distance transportation.
Comparative example 1
The other conditions were the same as in example 1, except that no rheological aid was added. The performance indexes of the fresh concrete are as follows: the time required for the slump cone to expand to 500mm is 6.4s, the expansion degree is 520mm, the height difference of a J ring is 21mm, fresh concrete is filled into a 10L capacity barrel and is placed on a vibrating table to vibrate for 10 times, the concrete is isolated and sinks to the bottom, and the concrete can hardly be poured out smoothly, so that the phenomenon that the concrete is easy to separate layers, isolate and bleed in the transportation process is reflected. .
Comparative example 2
Otherwise, the conditions were the same as in example 2, and the specific surface area of the diatomaceous earth added alone was 5000m2The performance indexes of the fresh concrete are as follows: the time required for the slump cone to expand to 500mm is 6.1s, the expansion degree is 630mm, the height difference of a J ring is 18mm, fresh concrete is filled into a 10L capacity barrel and is placed on a vibrating table to vibrate for 10 times, the concrete is isolated and sinks to the bottom, and the concrete can hardly be poured out smoothly, so that the phenomenon that the concrete is easy to separate layers, isolate and bleed in the transportation process is reflected.
Claims (8)
1. The utility model provides a self-compaction concrete of unpowered transport which characterized in that: the paint comprises the following components in parts by weight:
cement: 80-120 parts of fly ash: 30-50 parts of mineral powder: 10-30 parts of silica fume: 2-5 parts of diatomite: 0.05-0.5 parts of nano calcium carbonate powder: 0.02-0.1 part of fine aggregate: 200-300 parts of coarse aggregate: 250-350, swelling agent: 10-25 parts of a water reducing agent: 1.0-3.5 parts of retarder: 0.1-1 part of rheological additive: 0.01-0.05 part of defoaming agent: 0.001-0.003 parts of water: 50-80 parts of a water-soluble polymer,
the rheological additive is at least one selected from sodium carboxymethylcellulose, carboxymethylcellulose ether, carboxyethyl cellulose, aqueous polyurethane emulsion, aqueous polyamide emulsion and polyvinyl alcohol;
SiO in the diatomite2The content is more than or equal to 85 percent, and the surface area is more than or equal to 25000m2/kg。
2. The unpowered self-compacting concrete according to claim 1, wherein: the paint comprises the following components in parts by weight:
cement: 95-105 parts of fly ash: 30-40 parts of mineral powder: 15-25 parts of silica fume: 3-5 parts of diatomite: 0.1-0.5 parts of nano calcium carbonate powder: 0.03-0.08 parts of fine aggregate: 220-280 parts of coarse aggregate: 260-300, an expanding agent: 10-20 parts of a water reducing agent: 2-3.4 parts of retarder: 0.1-0.5 parts of rheological additive: 0.01-0.03 parts of defoaming agent: 0.001-0.002 parts of water: 50-60 parts.
3. A non-powered transportable self-compacting concrete according to claim 1 or 2, characterised in that: the particle size of the nano calcium carbonate powder is less than or equal to 0.1 mu m.
4. A non-powered transportable self-compacting concrete according to claim 1 or 2, characterised in that: the cement is selected from Portland cement with 28d strength more than 42.5MPa, the alkali content of the Portland cement is less than 0.6 percent, and the chloride ion content is less than 0.06 percent;
the quality grade of the fly ash is grade I, the CaO content of the fly ash is more than or equal to 7 percent, the activity index of the fly ash is more than or equal to 80 percent, and the water demand ratio of the fly ash is less than or equal to 90 percent;
the quality grade of the mineral powder is more than S95 grade, the content of active oxides is more than or equal to 40 percent, and the water demand ratio is less than or equal to 85 percent;
the surface area of the micro silicon powder is more than or equal to 20000m2Per kg, the activity index is more than or equal to 110 percent.
5. A non-powered transportable self-compacting concrete according to claim 1 or 2, characterised in that: the fine aggregate is selected from river sand or machine-made sand, the fineness modulus is 2.5-4.0, and the powder content is 2% -8%;
the coarse aggregate is at least one selected from limestone and basalt with the particle size of less than or equal to 16mm, wherein the mass fraction of the coarse aggregate with the particle size of 10-16 mm is more than or equal to 20%, and the sphericity coefficient of the coarse aggregate is more than or equal to 0.85.
6. A non-powered transportable self-compacting concrete according to claim 1 or 2, characterised in that: the expanding agent is a mixture consisting of scale-shaped aluminum powder and at least one of calcium sulphoaluminate, calcium oxide and magnesium oxide, wherein 1 part of the expanding agent contains 0.0001-0.0005 part of scale-shaped aluminum powder; the fineness of the scale-shaped aluminum powder is more than or equal to 250 meshes.
7. A non-powered transportable self-compacting concrete according to claim 1 or 2, characterised in that: the water reducing agent is an ester polycarboxylate water reducing agent, wherein the water reducing rate is more than or equal to 30 percent, and the solid content is more than or equal to 20 percent;
the retarder is a slow release type retarder, and the slow release type retarder is selected from at least one of emulsified sodium gluconate, calcium gluconate and calcium lignosulfonate;
the defoaming agent is selected from organosilicon defoaming agents, and the main component of the organosilicon defoaming agent is polyether-siloxane copolymer.
8. Use of a non-powered transportable self-compacting concrete according to claim 1 or 2, characterized in that: the unpowered self-compacting concrete is applied to a filling material between a track plate and a bottom plate of a ballastless track or a filling material between a turnout plate and a bottom plate in a turnout structure.
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| CN110156398B (en) * | 2019-05-22 | 2021-06-29 | 陕西新意达恒众混凝土有限公司 | High-strength concrete and preparation method thereof |
| CN111606676B (en) * | 2019-06-21 | 2022-05-17 | 中建材创新科技研究院有限公司 | High-water-retention gypsum self-leveling material and preparation method thereof |
| CN110563406A (en) * | 2019-09-27 | 2019-12-13 | 上海市城市建设设计研究总院（集团）有限公司 | Self-compacting concrete suitable for steel structure concrete combination beam combination section |
| CN113117132B (en) * | 2019-12-31 | 2022-11-22 | 广州迈普再生医学科技股份有限公司 | Absorbable expansion type nano short fiber powdery material and preparation method and application thereof |
| CN111454023A (en) * | 2020-05-26 | 2020-07-28 | 平潭远隆贸易有限公司 | Concrete and preparation method thereof |
| CN113105142B (en) * | 2021-04-24 | 2023-06-16 | 武汉理工大学 | Product concrete toughening functional component and preparation method and application thereof |
| CN113336508A (en) * | 2021-06-30 | 2021-09-03 | 中际远宏(福建)建设发展有限公司 | Self-compacting concrete and construction method thereof |
| CN116425447B (en) * | 2023-04-12 | 2023-11-17 | 保利长大工程有限公司 | Rheological agent and preparation method thereof, cable tower concrete and preparation method thereof |
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