CN113716915B - Sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement - Google Patents
Sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/26—Corrosion of reinforcement resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- 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 sprayed ultrahigh-performance concrete for anticorrosion reinforcement, which comprises the following components in parts by mass: cement: 500-700 parts of silicon-aluminum mineral admixture: 200-300 parts of silica fume: 100-200 parts of superfine powder: 50-70 parts of internal curing agent: 145-275 parts of water reducing agent: 8.9-17.1 parts of thickening agent: 3-7 parts of an early strength agent: 50-130 parts of glass fiber: 3-7 parts of water: 186 plus 236 parts of fine aggregate: 900 and 1000 portions. The sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement has the advantages that the sprayed ultrahigh-performance concrete has high early and later strength, low shrinkage rate, proper viscosity, good working performance and durability due to synergistic effect of the components, can be coagulated and cured within a short time to form high strength, ensures high construction efficiency, and avoids the problems of large shrinkage cracks caused by rapid coagulation of the concrete and low later strength of hardened slurry due to addition of a conventional sprayed concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement.
Background
The sprayed concrete is a construction method for pouring fine stone concrete by spraying a pressure spray gun. It is commonly used for pouring linings of tunnel, walls, ceilings and other thin-wall structures or linings of other structures and protective layers of steel structures. The sprayed concrete is formed by filling cement, sand, stones, water and a certain amount of additives which are prepared in advance into a spraying machine, sending the mixture to a spray head by utilizing high-pressure air, mixing the mixture with an accelerating agent and spraying the mixture to the surface of the rock or the concrete at a high speed. In the process of preparing the sprayed concrete, coarse aggregate and fine aggregate are usually added, the maximum nominal particle size of the coarse aggregate can be 12mm at most according to a spraying structure, the fine aggregate is coarse sand in a II area with the fineness modulus within the range of 2.5-3.2, so that the primary spraying thickness of the coarse aggregate is larger, for example, in railway tunnel engineering, the primary spraying thickness of the concrete is 3-5 cm in general arch parts, 5-10 cm in side walls, and the larger spraying thickness is easy to form larger rebound rate in the spraying process of the sprayed concrete, so that certain parts of the concrete cannot be completely compacted and cannot be completely adhered to a matrix, the capability of the sprayed concrete for resisting the corrosion of external harmful substances is greatly reduced, and the matrix cannot be well reinforced and prevented from corrosion.
The ultra-high performance concrete (UHPC) is a fiber reinforced cement-based composite material with ultra-high anti-permeability performance and mechanical performance, the closest packing theory is usually taken as a design theory, submicron-sized particles (silica fume) are adopted to fill the packing gaps among micron-sized particles (cement, fly ash and mineral powder), micron-sized particles (cement, fly ash and mineral powder) are adopted to fill the packing gaps among millimeter-sized particles (aggregate), the concrete with the compressive strength of more than 120MPa is obtained, and fibers are usually added for improving the toughness of the ultra-high performance concrete and preventing cracking. The UHPC is particularly suitable for large-span bridges, anti-explosion structures (military engineering, bank vaults and the like) and thin-wall structures as well as high-abrasion and high-corrosion environments due to the excellent mechanical property and anti-permeability performance of the UHPC. Currently, UHPC has been used in practical projects, such as large-span pedestrian overpasses, highway and railway bridges, thin-walled silos, nuclear waste tanks, steel cable anchoring reinforcing plates, ATM machine protective cases, and the like. If the material is used for the construction of sprayed concrete, the material has ultrahigh mechanical property, a super-compact structure and excellent durability, so that the thickness of the sprayed concrete can be greatly reduced under the same construction requirement or even higher construction requirement, the rebound rate is reduced, the corrosion resistance of a matrix is greatly improved, and the matrix is effectively reinforced. However, due to the high use amount and low water-gel ratio of the UHPC cementing material and the water reducing agent, the UHPC has the characteristics of high viscosity, high fluidity and large shrinkage, so that the UHPC is not suitable for spray construction.
Disclosure of Invention
The invention aims to solve the technical problem of providing sprayed ultra-high performance concrete for corrosion prevention and reinforcement so as to solve the problems of low strength and poor durability of the conventional sprayed concrete and further cause poor corrosion prevention and reinforcement effects.
The technical scheme adopted by the invention for solving the technical problems is as follows: the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement comprises the following components in parts by mass:
cement: 500-700 parts of silicon-aluminum mineral admixture: 200-300 parts of silica fume: 100-200 parts of superfine powder: 50-70 parts of internal curing agent: 145-275 parts of water reducing agent: 8.9-17.1 parts of thickening agent: 3-7 parts of an early strength agent: 50-130 parts of glass fiber: 3-7 parts of water: 186 plus 236 parts of fine aggregate: 900 and 1000 portions.
In the scheme, the cement is P.O 42.5 cement or P.O 52.5 cement.
In the scheme, the silicon-aluminum mineral admixture is one or more of fly ash, metakaolin and fly ash microbeads; the water requirement ratio of the silicon-aluminum mineral admixture is not more than 105 percent, and the 28d activity index is not less than 70 percent.
In the scheme, the water demand ratio of the silica fume is not more than 125%, and the 28d activity index is not less than 105%.
In the scheme, the ultrafine powder is one or more of quartz powder and iron tailing powder, and the specific surface area of the ultrafine powder is not less than 750kg/m 2 。
In the scheme, the internal curing agent is a mixture of zeolite powder and coal gangue slag, and the mass ratio of the zeolite powder to the coal gangue slag is 1: 1.4-4.5.
In the scheme, the fineness modulus of the coal gangue slag is 2.4-2.6, the maximum particle size of the coal gangue slag is not more than 4.25mm, and the content of particles smaller than 0.075mm is 6.0-9.3%; the fineness of the zeolite powder is 100-200 meshes.
In the scheme, the water reducing agent is a powdery polycarboxylic acid water reducing agent, the thickening agent is polyethylene glycol distearate, and the length of the glass fiber is 6-8 mm.
In the scheme, the early strength agent is a mixture of nano silicon dioxide and quick-hardening sulphoaluminate cement; the mass ratio of the nano silicon dioxide to the quick-hardening sulphoaluminate cement is (2-5) to 100.
In the scheme, the fine aggregate is one or more of quartz sand and machine-made sand; the fineness of the quartz sand is 40-70 meshes; the machine-made sand is limestone machine-made sand, the fineness modulus of the machine-made sand is 2.5-2.7, the maximum particle size of the machine-made sand is not more than 4.25mm, and the content of stone powder with the particle size less than 0.075mm is 5-15%.
The working principle of the invention is as follows:
the invention adopts the principle of dual synergistic optimization of multi-component particle size fraction and activity, takes cement, a silicon-aluminum mineral admixture and silica fume as main active cementing materials, and compounds micro-nano-scale ultrafine powder with physical filling effect to fill gaps among particles of the whole system, so that the whole system has excellent pumpability and sagging resistance under the action of a proper additive, and simultaneously has good mechanical property, durability and high adhesive property with a base material. In addition, the invention adds the porous zeolite powder with higher activity and the porous coal gangue slag as the internal curing agent, on one hand, the invention can promote the further hydration of the gelled material and improve the compactness of the hardened slurry, on the other hand, the invention can reduce the reduction effect of the internal humidity caused by the hydration, thereby achieving the purpose of inhibiting the self-shrinkage through the first self-curing effect and further greatly reducing the shrinkage of the whole system.
Meanwhile, the glass fiber is dispersed in the slurry to form a network structure, so that the glass fiber has good tensile and toughening effects, and the crack resistance of the whole system is greatly improved. In addition, the water-soluble polyethylene glycol distearate is taken as a thickening agent, contains hydrophobic-hydrophilic-hydrophobic groups, can be associated with surrounding water molecules through hydrogen bonds, and reduces the free movement space of particles in a system, thereby achieving the purpose of regulating and controlling the viscosity of the system. In addition, the invention uses nano silicon dioxide and quick hardening sulfur aluminiumThe mixture of the acid salt cement is an early strength agent which can promote C 3 The hydration of S improves the early strength of the hardened slurry, and on the other hand, the viscosity of the slurry can be further regulated and controlled under the combined action of the S and the S, so that the slurry can be effectively prevented from sagging after being sprayed to the matrix, and the slurry can be ensured to generate higher early strength after being sprayed to the matrix, thereby being beneficial to accelerating the construction progress, and avoiding the shrinkage crack caused by the rapid coagulation of the concrete after the conventional accelerator is added into the concrete. In addition, the porous zeolite powder with the internal curing effect and the coal gangue slag are added, so that the active mineral admixture and the trace nano-silica in the system still have enough water to participate in the hydration reaction in the later hydration period, and the whole system has higher later strength.
The sprayed ultrahigh-performance concrete for anticorrosion reinforcement has the following beneficial effects:
1. the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement has the advantages that the sprayed ultrahigh-performance concrete has high early and later strength, low shrinkage, proper viscosity, good working performance and durability due to synergistic effect of the components, wherein the 1d compressive strength can reach 115.2MPa, and the 1d bending strength can reach 15.2 MPa; the 28d compressive strength can reach 157.3MPa, and the 28d bending strength can reach 30.1 MPa; the 3d self-contraction can be as low as 147 x 10 -6 mm, 180d drying shrinkage can be as low as 75 multiplied by 10 -6 mm, the diffusion coefficient of chloride ions can be as low as 2.1 multiplied by 10 -14 m 2 ·s -1 And when the material is used for spraying construction, the rebound resilience can be as low as 2.8 percent.
2. Compared with the conventional sprayed concrete, the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement has the advantages that the raw materials have synergistic effect, so that the sprayed ultrahigh-performance concrete can be well pasted with a matrix under the condition of no accelerator, can be coagulated and cured in a short time to form higher strength, ensures higher construction efficiency, and avoids the problems of large shrinkage crack caused by rapid coagulation of the concrete and low later strength of hardened paste due to the addition of the accelerator in the conventional sprayed concrete.
3. The sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement has mechanical properties and durability which are equivalent to or even higher than those of the conventional ultrahigh-performance concrete, but can be subjected to spraying construction operation, so that the sprayed ultrahigh-performance concrete has a wider application range and can be constructed under various complex working conditions; meanwhile, due to the good compactness and durability, the spray gun can be sprayed in an ultrathin way with the thickness of 3-10 mm, and can be used for carrying out anticorrosion protection on structures such as steel, common concrete and the like in a corrosive environment.
4. The invention adopts the coal gangue slag as the internal curing agent to prepare the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement, provides a new way for the high added value utilization of the coal gangue slag, has important significance for the resource utilization of the coal gangue slag, can pre-mix each powder material in advance, contributes to further improving the construction efficiency, and is favorable for avoiding the slurry performance change caused by material fluctuation, thereby being favorable for the control of the construction quality.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described in detail.
Example 1
The sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement comprises the following components in parts by weight: cement: 700 parts of fly ash: 200 parts, silica fume: 100 parts of quartz powder: 50 parts, zeolite powder: 70 parts of water reducing agent: 17.1 parts, thickening agent: 3 parts of an early strength agent: 50 parts, glass fiber: 5 parts, water: 186 parts, fine aggregate: 900 parts of coal gangue slag: 100 parts.
Wherein the cement is P.O 52.5 cement; the water demand ratio of the fly ash is 103 percent, and the 28d activity index is 77 percent; the water demand ratio of the silica fume is 115 percent, and the 28d activity index is 118 percent; the superfine powder is quartz powder with specific surface area of 850kg/m 2 (ii) a The fineness of the zeolite powder is 200 meshes; the water reducing agent is a powdery polycarboxylic acid water reducing agent; the thickening agent is polyethylene glycol distearate; the early strength agent is a mixture of nano silicon dioxide and R.SAC 52.5 type rapid hardening sulphoaluminate cement, and the mass ratio of the nano silicon dioxide to the R.SAC 52.5 type rapid hardening sulphoaluminate cement is 2: 100; the length of the glass fiber is 6-8 mm; the fine aggregate is quartz sand, and the fineness of the quartz sand is 40-70 meshes(ii) a The coal gangue slag is waste slag discharged after power generation of a power plant by adopting a circulating fluidized bed boiler process, the maximum particle size of the waste slag is not more than 4.25mm, the fineness modulus is 2.5, and the content of particles smaller than 0.075mm is 7.8%.
Example 2
This example differs from example 1 in that: the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement comprises the following components in parts by weight: cement: 700 parts of fly ash: 300 parts, silica fume: 120 parts of quartz powder: 50 parts, zeolite powder: 70 parts of water reducing agent: 15.6 parts of a thickening agent: 3 parts of an early strength agent: 50 parts, glass fiber: 5 parts, water: 215 parts of fine aggregate: 1000 parts of coal gangue slag: 100 parts.
Example 3
The present example differs from example 1 in that: the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement comprises the following components in parts by weight: cement: 500 parts, fly ash microbeads: 200 parts of silica fume: 120 parts of quartz powder: 50 parts, zeolite powder: 70 parts of water reducing agent: 15.6 parts of a thickening agent: 3 parts of an early strength agent: 50 parts, glass fiber: 5 parts, water: 186 parts, fine aggregate: 1000 parts of coal gangue slag: 100 parts.
Wherein the water demand ratio of the fly ash micro-beads is 95%, and the 28d activity index is 90%; the early strength agent is a mixture of nano-silica and R.SAC 42.5 type rapid hardening sulphoaluminate cement, and the mass ratio of the nano-silica to the R.SAC 42.5 type rapid hardening sulphoaluminate cement is 2: 100.
Example 4
This example differs from example 1 in that: the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement comprises the following components in parts by weight: cement: 700 parts, fly ash micro-beads: 300 parts, silica fume: 200 parts of iron tailing powder: 70 parts, zeolite powder: 70 parts of water reducing agent: 14.2 parts of thickening agent: 3 parts of an early strength agent: 80 parts, glass fiber: 5 parts, water: 225 parts of fine aggregate: 1000 parts of coal gangue slag: 150 parts.
Wherein the water demand ratio of the fly ash micro-beads is 95%, and the 28d activity index is 90%; the early strength agent is a mixture of nano-silica and R.SAC 52.5 type rapid hardening sulphoaluminate cement, and the mass ratio of the nano-silica to the R.SAC 52.5 type rapid hardening sulphoaluminate cement is 5: 100.
Example 5
The present example differs from example 1 in that: the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement comprises the following components in parts by weight: cement: 650 parts, fly ash: 300 parts of silica fume: 100 parts of iron tailing powder: 50 parts, zeolite powder: 50 parts of water reducing agent: 17.1 parts, thickening agent: 7 parts of an early strength agent: 130 parts, glass fiber: 5 parts of water: 228 parts, fine aggregate: 900 parts, gangue slag: 200 parts.
Wherein the early strength agent is a mixture of nano-silica and R.SAC 42.5 type rapid hardening sulphoaluminate cement, and the mass ratio of the nano-silica to the R.SAC 42.5 type rapid hardening sulphoaluminate cement is 2: 100.
Example 6
The present example differs from example 1 in that: the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement comprises the following components in parts by weight: cement: 600 parts, higher soil taking: 260 parts of silica fume: 100 parts of quartz powder: 60 parts, zeolite powder: 45 parts of water reducing agent: 10.7 parts of a thickening agent: 5 parts of an early strength agent: 50 parts, glass fiber: 5 parts, water: 215 parts of fine aggregate: 950 parts of coal gangue slag: 150 parts.
Wherein the water demand ratio of the higher territory is 116 percent, and the 28d activity index is 112 percent; the fine aggregate is limestone machine-made sand, the fineness modulus of the fine aggregate is 2.5, the maximum grain diameter of the fine aggregate is not more than 4.75mm, and the content of stone powder with the grain diameter of less than 0.075mm is 10%.
The preparation method of the sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement in the embodiments 1 to 6 of the invention specifically comprises the following steps:
according to the formula of the raw materials, mixing cement, a silicon-aluminum mineral admixture, silica fume, ultrafine powder, a water reducing agent, a thickening agent, an early strength agent and fine aggregates, and stirring to fully premix the powder to obtain a mixture A;
and (2) spraying water to wet the mixture of the zeolite powder and the coal gangue slag until the set water content is not more than the water content of a dry state of a saturated surface to the maximum extent, then adding the mixture of the zeolite powder and the coal gangue slag after being sprayed with water and wetted into the mixture A, stirring for a period of time, adding water, continuing to stir for a period of time until slurry is discharged, adding glass fiber, and continuing to stir for a period of time to obtain the sprayed ultrahigh-performance concrete for corrosion protection and reinforcement.
In the embodiment, after premixing each powder raw material, mixing the premixed powder raw material with the mixture of the zeolite powder and the coal gangue slag after being wetted by water spray, and adding the glass fiber after slurry discharge, the whole preparation process is simple, and the mixture of the zeolite powder and the coal gangue slag after being wetted by water spray is in a passivation state, so that the physical and mechanical properties of the whole system can be improved, internal moisture can be released in a hydration process, the internal humidity of the hardened slurry can be regulated, the shrinkage of the hardened slurry can be effectively reduced, sufficient volcanic ash reaction conditions are provided for an active mineral admixture in the hardened slurry, the compactness of the internal structure of the hardened slurry is greatly improved, and the mechanical property and the durability of the prepared sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement are further improved.
The mechanical properties, impermeability, shrinkage and slurry resilience of the sprayed ultrahigh-performance concrete for corrosion protection and reinforcement in examples 1 to 6 of the present invention were measured, and the measurement results are shown in table 1, in which the dimensions of the compressive strength test block were 100 × 100 × 100mm, the dimensions of the bending strength test block were 100 × 100 × 400mm and the dimensions of the shrinkage test block were 100 × 100 × 515 mm.
TABLE 1
As can be seen from Table 1, the sprayed ultrahigh-performance concrete for anticorrosion reinforcement in examples 1 to 6 of the present invention has good mechanical properties, durability and low rebound resilience. Wherein the 1d compressive strength can reach 115.2MPa, and the 1d bending strength can reach 15.2 MPa; the 28d compressive strength can reach 157.3MPa, and the 1d bending strength can reach 30.1 MPa; the rebound rate can be as low as 2.8 percent, and the 7d self-contraction can be as low as 247 multiplied by 10 -6 mm, 180d drying shrinkage can be as low as 127 multiplied by 10 -6 mm, the diffusion coefficient of chloride ions can be as low as 2.1 multiplied by 10 -14 m 2 ·s -1 And the performances are far superior to those of the conventional sprayed concrete.
While embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, which are intended to be illustrative rather than limiting, and many modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement is characterized by comprising the following components in parts by mass:
cement: 500-700 parts of silicon-aluminum mineral admixture: 200-300 parts of silica fume: 100-200 parts of superfine powder: 50-70 parts of internal curing agent: 145-275 parts of water reducing agent: 8.9-17.1 parts of thickening agent: 3-7 parts of an early strength agent: 50-130 parts of glass fiber: 3-7 parts of water: 186 plus 236 parts of fine aggregate: 900-1000 parts of organic silicon;
the internal curing agent is a mixture of zeolite powder and coal gangue slag, and the mass ratio of the zeolite powder to the coal gangue slag is 1: 1.4-4.5; the water reducing agent is a powdery polycarboxylic acid water reducing agent, the thickening agent is polyethylene glycol distearate, and the length of the glass fiber is 6-8 mm; the early strength agent is a mixture of nano silicon dioxide and quick-hardening sulphoaluminate cement; the mass ratio of the nano silicon dioxide to the quick-hardening sulphoaluminate cement is (2-5) to 100;
the silicon-aluminum mineral admixture is one or more of fly ash, metakaolin and fly ash microbeads; the water requirement ratio of the silicon-aluminum mineral admixture is not more than 105 percent, and the 28d activity index is not less than 70 percent;
the superfine powder is one or more of quartz powder and iron tailing powder, and the specific surface area of the superfine powder is not less than 750kg/m 2 。
2. The sprayed ultrahigh-performance concrete for anticorrosive reinforcement according to claim 1, wherein the cement is P · O42.5 cement or P · O52.5 cement.
3. The sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement according to claim 1, wherein the silica fume has a water demand ratio of not more than 125% and a 28d activity index of not less than 105%.
4. The sprayed ultrahigh-performance concrete for anticorrosion reinforcement as claimed in claim 1, wherein the fineness modulus of the gangue slag is 2.4-2.6, the maximum particle size of the gangue slag is not more than 4.25mm, and the content of particles smaller than 0.075mm is 6.0-9.3%; the fineness of the zeolite powder is 100-200 meshes.
5. The sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement according to claim 1, wherein the fine aggregate is one or more of quartz sand and machine-made sand; the fineness of the quartz sand is 40-70 meshes; the machine-made sand is limestone machine-made sand, the fineness modulus of the machine-made sand is 2.5-2.7, the maximum particle size of the machine-made sand is not more than 4.25mm, and the content of stone powder with the particle size less than 0.075mm is 5-15%.
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| CN114213078A (en) * | 2021-12-20 | 2022-03-22 | 中核华辰建筑工程有限公司 | Wet spraying method cement micro-bead combined gel system sprayed concrete repairing and reinforcing material |
| CN114477843B (en) * | 2022-01-27 | 2022-09-09 | 武汉源锦建材科技有限公司 | Heat-resistant admixture for shotcrete and application thereof |
| CN114907070A (en) * | 2022-05-11 | 2022-08-16 | 湖南人健宝固高新科技发展有限公司 | Non-shrinkage sprayable ultrahigh-performance concrete and construction method thereof |
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