CN113511860B - Emulsified asphalt modified low-resilience shotcrete and preparation method thereof - Google Patents
Emulsified asphalt modified low-resilience shotcrete and preparation method thereof 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/36—Bituminous materials, e.g. tar, pitch
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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
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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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Abstract
The invention discloses emulsified asphalt modified low-resilience shotcrete which comprises the following raw material components in parts by weight: 435 parts of cement, 70-100 parts of emulsified asphalt, 175-215 parts of water, 787.5-1050 parts of river sand, 700-962.5 parts of limestone, 35 parts of an accelerator and 24-40 parts of a mineral admixture. The preparation method of the low-resilience shotcrete comprises the steps of mixing and sieving river sand and limestone, adding cement, mixing, adding water, stirring and mixing uniformly, adding emulsified asphalt, quickly stirring and reacting at the stirring speed of 120-150 r/min, adding a mineral admixture and/or high-strength high-modulus fiber and an accelerating agent, and mixing for use. The shotcrete prepared by the method has the characteristic of low rebound rate, and can reduce material waste and improve construction efficiency when being used for supporting construction of tunnels and underground projects.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to emulsified asphalt modified low-resilience shotcrete and a preparation method thereof.
Background
The sprayed concrete is used as one of main forms of supporting of tunnels and underground engineering, the using amount of the sprayed concrete is increased sharply along with the increase of engineering projects along with the further development of foundation construction, meanwhile, in the existing sprayed concrete construction in China, because the proportion is unreasonable, the control parameters of the sprayer are not clear, the rebound rate in the spraying process is overlarge, a large amount of waste of materials is caused, the quality of the sprayed concrete is influenced, certain potential safety hazards are caused to a sprayer, meanwhile, unnecessary material circulation transportation is caused, the construction efficiency is influenced, and the material waste also causes great pressure to the environment. With the continuous expansion of the application range of the sprayed concrete in supporting and reinforcing engineering, the quality of the sprayed concrete is further improved, the rebound rate in the construction process of the sprayed concrete is reduced, and the method has practical significance for the technical research of the low-rebound sprayed concrete especially under the existing technical equipment and management level of highway tunnels in China.
The rebound resilience of the sprayed concrete is influenced by the following three factors: (1) from the raw material perspective, measures such as adding admixture and fiber, improving the fineness of the admixture, reducing the maximum particle size of aggregate and the like can reduce the dispersibility of concrete in the spraying and conveying process and reduce the rebound rate. (2) From the aspect of mixing proportion, measures of increasing the using amount of the cementing material, improving the consistency of concrete, adjusting proper slump and setting time and the like can improve the adhesion efficiency of the sprayed concrete and reduce the rebound rate. (3) From the construction process angle, measures such as properly improving the primary injection thickness, taking a straight angle as an injection angle, controlling reasonable working wind pressure and the like can obviously reduce the rebound rate.
At present, researchers at home and abroad make a lot of researches on reducing the rebound resilience of the sprayed concrete, but the researches from the viewpoint of material modification are less. Therefore, the common sprayed concrete material is urgently needed to be modified so as to solve the problems of high rebound rate of the sprayed concrete, poor concrete impermeability and the like, reduce the waste of raw materials while improving the performance of the tunnel lining concrete, ensure the health of constructors and improve the social and economic efficiency.
Disclosure of Invention
Aiming at the defects, the invention discloses emulsified asphalt modified low-resilience shotcrete and a preparation method thereof, and the shotcrete with low resilience rate is produced and prepared, so that the material waste is reduced, and the construction efficiency of the shotcrete is improved.
The invention is realized by adopting the following technical scheme:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 70-100 parts of emulsified asphalt, 175-215 parts of water, 787.5-1050 parts of river sand, 700-962.5 parts of limestone, 35 parts of an accelerator and 24-40 parts of a mineral admixture; the cement is P.O42.5 Portland cement, the emulsified asphalt is anionic emulsified asphalt, the accelerator is one or the combination of two of aluminum sulfate and sodium fluoride, and the mineral admixture is one or the combination of more of first-grade fly ash, micro-silica fume and superfine limestone powder.
Furthermore, the raw materials of the emulsified asphalt modified low-resilience shotcrete also comprise 2-6 parts by weight of high-strength and high-modulus fibers, wherein the high-strength and high-modulus fibers are one or a combination of polyvinyl alcohol fibers, polypropylene fibers and PE fibers.
Furthermore, the length of the polyvinyl alcohol fiber is 3-5 μm.
Further, the anionic emulsified asphalt is one or a combination of a sulfonate emulsified asphalt, a carboxylate emulsified asphalt and a sulfate emulsified asphalt.
Further, the mineral admixture is a combination of micro silica fume and superfine limestone powder, the mass ratio of the micro silica fume to the superfine limestone powder is 2:1, the particle size of the micro silica fume is 0.1-0.2 mu m, and the particle size of the superfine limestone powder is 30-35 mu m.
Further, the accelerator is a combination of aluminum sulfate and sodium fluoride, and the mass ratio of the aluminum sulfate to the sodium fluoride is 5: 1.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components in proportion, mixing and sieving river sand and limestone with the aperture of a screen being 4.75-9.5 mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 60-80 r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at the stirring speed of 120-150 r/min, and finally adding a mineral admixture and/or high-strength high-modulus fibers, and quickly stirring for 1.5min at the stirring speed of 120-150 r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the setting accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a grouting pump, fusing the mixture A with the setting accelerator, and spraying by using compressed air.
The invention adopts the emulsified asphalt to modify the sprayed concrete, and at the initial reaction stage, because of the electrostatic attraction and van der Waals force existing between the cement particles and the asphalt particles, the asphalt particles can be gathered on the surfaces of the cement particles, and most of the asphalt particles form a flocculent structure near the cement particles; along with the cement hydration and the demulsification of emulsified asphalt, asphalt particles can be gradually adsorbed onto the surfaces of the cement particles; after the emulsified asphalt is completely demulsified, the asphalt-water interfacial tension in the system gradually transits to the asphalt-cement interfacial tension, and at the moment, the asphalt particles recover the cohesive force, so that the asphalt particles can be adhered to the surrounding cement particles, thereby increasing the cohesive force and achieving the purpose of reducing the rebound rate of the sprayed concrete.
Meanwhile, because the concrete belongs to a continuous particle accumulation system, the strength is exerted by binding aggregates with various particle sizes together by a cementing material, and the concrete inevitably generates gaps in the hardening process to influence the compressive strength of the concrete, the invention adds the secondary-grade particles of the micro-silica fume, the superfine limestone powder and the like, so that the void ratio in the concrete can be reduced, the concrete structure is more compact, the strength of the concrete is improved to a certain extent, and the micro-silica fume has a strong pozzolanic effect, can generate a secondary hydration reaction with calcium hydroxide which is a cement hydration product to form a gel product, fills a cement stone structure, and improves the mechanical property of the concrete; the ultrafine limestone powder can promote hydration reaction of cement, and reacts with aluminum-containing minerals in the cement to generate calcium carbonate aluminate, which contributes to the development of concrete strength.
The high-strength high-modulus fiber is added, because the cement base material and the fiber bear external force together at the initial loading stage of the sprayed concrete, and the cement base material and the fiber are main recipients of the external force; when the base material is cracked, the fibers across the crack become the primary subject of the external force. In the hardening process of the concrete, the fiber can change the internal structure of the concrete, reduce the number and the size of plastic cracks and internal microcracks of the concrete, and improve the continuity of concrete material media, thereby improving the comprehensive performance of the concrete; the fiber changes the stress field of the concrete matrix in the stress process of the fiber concrete, thereby improving the mechanical property of the concrete.
Compared with the prior art, the technical scheme has the following beneficial effects:
the invention adopts emulsified asphalt as a modified material, prepares a shotcrete material with low rebound rate by physical blending, has good mechanical property and larger cohesive force after the material is condensed and cured, can be effectively bonded to the tunnel wall in the lining support engineering at the initial stage of tunnel construction, reduces the rebound rate of the shotcrete and increases the impermeability, thereby effectively improving the protection capability of the shotcrete on structures.
Detailed Description
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. The specific experimental conditions and methods not indicated in the following examples are generally conventional means well known to those skilled in the art.
Example 1:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 100 parts of emulsified asphalt, 175 parts of water, 787.5 parts of river sand, 962.5 parts of limestone, 35 parts of an accelerator, 30 parts of a mineral admixture and 5 parts of high-strength and high-modulus fibers; the cement is P.O42.5 Portland cement, the emulsified asphalt is sodium dodecyl sulfate emulsified asphalt, the accelerator is sodium fluoride, the mineral admixture is microsilica ash, and the particle size of the microsilica ash is 0.1-0.2 μm; the high-strength high-modulus fiber is polyvinyl alcohol fiber, and the length of the polyvinyl alcohol fiber is 3-5 mu m.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 4.75mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 60r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at the stirring speed of 120r/min, and finally adding a mineral admixture and high-strength high-modulus fibers, and quickly stirring for 1.5min at the stirring speed of 120r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Example 2:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 75 parts of emulsified asphalt, 215 parts of water, 787.5 parts of river sand, 962.5 parts of limestone, 35 parts of an accelerating agent and 30 parts of a mineral admixture; the cement is Portland cement of P.O42.5, the accelerating agent is aluminum sulfate, the emulsified asphalt is sodium dodecyl sulfate emulsified asphalt, and the mineral admixture is first-grade fly ash.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 5.5mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 70r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at the stirring speed of 130r/min, and finally adding a mineral admixture, and quickly stirring for 1.5min at the stirring speed of 120r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Example 3:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 100 parts of emulsified asphalt, 175 parts of water, 787.5 parts of river sand, 962.5 parts of limestone, 35 parts of an accelerating agent, 30 parts of a mineral admixture and 3 parts of high-strength and high-modulus fibers; the cement is Portland cement of P.O42.5, the emulsified asphalt is sodium dodecyl sulfate emulsified asphalt, the accelerating agent is aluminum sulfate, the mineral admixture is a combination of primary fly ash and superfine limestone powder, the mass ratio of the primary fly ash to the superfine limestone powder is 2:1, and the particle size of the superfine limestone powder is 30-35 mu m; the high-strength high-modulus fiber is polypropylene fiber.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a sieve being 7.5mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 80r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at the stirring speed of 140r/min, and finally adding a mineral admixture and high-strength high-modulus fibers, and quickly stirring for 1.5min at the stirring speed of 130r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Example 4:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 75 parts of emulsified asphalt, 215 parts of water, 787.5 parts of river sand, 962.5 parts of limestone, 35 parts of an accelerating agent and 30 parts of a mineral admixture; the cement is P.O42.5 Portland cement, the emulsified asphalt is sodium dodecyl sulfate emulsified asphalt, the accelerator is a combination of aluminum sulfate and sodium fluoride, the mass ratio of the aluminum sulfate to the sodium fluoride is 5:1, the mineral admixture is ultrafine limestone powder, and the particle size of the ultrafine limestone powder is 30-35 mu m.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 9.5mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 80r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at the stirring speed of 150r/min, and finally adding a mineral admixture and/or high-strength high-modulus fibers, and quickly stirring for 1.5min at the stirring speed of 150r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Example 5:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 100 parts of emulsified asphalt, 175 parts of water, 787.5 parts of river sand, 962.5 parts of limestone, 35 parts of an accelerator, 30 parts of a mineral admixture and 2-6 parts of high-strength and high-modulus fibers; the cement is P.O42.5 Portland cement, the emulsified asphalt is sodium dodecyl sulfate emulsified asphalt, the accelerator is a combination of aluminum sulfate and sodium fluoride, the mass ratio of the aluminum sulfate to the sodium fluoride is 5:1, the mineral admixture is a combination of micro-silica fume and ultrafine limestone powder, the mass ratio of the micro-silica fume to the ultrafine limestone powder is 2:1, the particle size of the micro-silica fume is 0.1-0.2 mu m, the particle size of the ultrafine limestone powder is 30-35 mu m, the high-strength high-modulus fiber is polyvinyl alcohol fiber, and the length of the polyvinyl alcohol fiber is 3-5 mu m.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 5mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 60r/min, adding emulsified asphalt, quickly stirring and reacting for 3min at the stirring speed of 130r/min, and finally adding a mineral admixture and high-strength high-modulus fibers, and quickly stirring for 1.5min at the stirring speed of 120r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Example 6:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 75 parts of emulsified asphalt, 215 parts of water, 787.5 parts of river sand, 962.5 parts of limestone, 35 parts of an accelerating agent, 35 parts of a mineral admixture and 3 parts of high-strength and high-modulus fibers; the cement is P.O42.5 Portland cement, the emulsified asphalt is sodium dodecyl sulfate emulsified asphalt, the accelerator is a combination of aluminum sulfate and sodium fluoride, the mass ratio of the aluminum sulfate to the sodium fluoride is 5:1, the mineral admixture is a combination of micro silica fume and ultrafine limestone powder, the mass ratio of the micro silica fume to the ultrafine limestone powder is 2:1, the particle size of the micro silica fume is 0.1-0.2 mu m, the particle size of the ultrafine limestone powder is 30-35 mu m, the high-strength high-modulus fiber is polyvinyl alcohol fiber, and the length of the polyvinyl alcohol fiber is 3-5 mu m.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 8.0mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at a stirring speed of 70r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at a stirring speed of 140r/min, and finally adding a mineral admixture and high-strength high-modulus fibers, and quickly stirring for 1.5min at a stirring speed of 130r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Example 7:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 70 parts of emulsified asphalt, 190 parts of water, 950 parts of river sand, 825 parts of limestone, 35 parts of an accelerating agent, 24 parts of a mineral admixture and 6 parts of high-strength high-modulus fibers; the cement is P.O42.5 Portland cement, the emulsified asphalt is equal-mass mixed combination of sodium dodecyl sulfate emulsified asphalt and sodium dodecyl sulfate emulsified asphalt, the accelerating agent is aluminum sulfate, the mineral admixture is equal-mass mixed combination of first-grade fly ash and ultrafine limestone powder, and the particle size of the ultrafine limestone powder is 30-35 mu m; the high-strength high-modulus fiber is a polypropylene fiber.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 6.0mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at a stirring speed of 70r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at a stirring speed of 150r/min, and finally adding a mineral admixture and high-strength high-modulus fibers, and quickly stirring for 1.5min at a stirring speed of 140r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Example 8:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 70 parts of emulsified asphalt, 200 parts of water, 1050 parts of river sand, 700 parts of limestone, 35 parts of an accelerator, 40 parts of a mineral admixture and 2 parts of high-strength and high-modulus fibers; the cement is P.O42.5 Portland cement, the emulsified asphalt is sodium dodecyl sulfate emulsified asphalt, the accelerator is a combination of aluminum sulfate and sodium fluoride, the mass ratio of the aluminum sulfate to the sodium fluoride is 5:1, the mineral admixture is a combination of micro silica fume and ultrafine limestone powder, the mass ratio of the micro silica fume to the ultrafine limestone powder is 2:1, the particle size of the micro silica fume is 0.1-0.2 mu m, the particle size of the ultrafine limestone powder is 30-35 mu m, the high-strength high-modulus fiber is an equal mass combination of polyvinyl alcohol fiber and polypropylene fiber, and the length of the polyvinyl alcohol fiber is 3-5 mu m.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 6.5mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 80r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at the stirring speed of 120r/min, and finally adding a mineral admixture and high-strength high-modulus fibers, and quickly stirring for 1.5min at the stirring speed of 120r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Example 9:
the emulsified asphalt modified low-resilience shotcrete comprises the following raw material components in parts by weight: 435 parts of cement, 85 parts of emulsified asphalt, 195 parts of water, 850 parts of river sand, 880 parts of limestone, 35 parts of an accelerator, 35 parts of a mineral admixture and 4 parts of high-strength and high-modulus fibers; the cement is P.O42.5 Portland cement, the emulsified asphalt is sodium dodecyl sulfate emulsified asphalt, the accelerator is a combination of aluminum sulfate and sodium fluoride, the mass ratio of the aluminum sulfate to the sodium fluoride is 5:1, the mineral admixture is a combination of micro-silica fume and ultrafine limestone powder, the mass ratio of the micro-silica fume to the ultrafine limestone powder is 2:1, the particle size of the micro-silica fume is 0.1-0.2 mu m, the particle size of the ultrafine limestone powder is 30-35 mu m, the high-strength high-modulus fiber is polyvinyl alcohol fiber, and the length of the polyvinyl alcohol fiber is 3-5 mu m.
The preparation method of the emulsified asphalt modified low-resilience shotcrete comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 5.5mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 60r/min, adding emulsified asphalt, quickly stirring for reaction for 3min at the stirring speed of 130r/min, and finally adding a mineral admixture and high-strength high-modulus fibers, and quickly stirring for 1.5min at the stirring speed of 130r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
Comparative example 1:
the sprayed concrete comprises the following raw material components in parts by weight: 435 parts of cement, 200 parts of water, 850 parts of river sand, 820 parts of limestone, 35 parts of an accelerator and 4 parts of high-strength and high-modulus fibers; the cement is P.O42.5 portland cement, the accelerator is a mixed combination of aluminum sulfate and sodium fluoride in equal mass, and the high-strength and high-modulus fiber is polypropylene fiber.
The shotcrete of this comparative example was prepared in the same manner as the emulsified asphalt-modified low-resilience shotcrete described in example 1.
Experimental example:
the shotcretes prepared according to the methods of examples 1 to 9 and comparative example 1 were tested for the compressive strength and the resilience for 28d, and the test results are shown in table 1.
TABLE 1 test results of 28d compressive strength and rebound resilience of shotcrete
As can be seen from Table 1, the addition of the mineral admixture and the emulsified asphalt according to the method of the present invention can improve the compressive strength of shotcrete and reduce the rebound resilience. When the mineral admixture is mixed by the micro-silica fume and the superfine limestone powder, the compressive strength and the rebound resilience of the obtained sprayed concrete are obviously superior to those of the single use of the mixed combination of the first-grade fly ash, the micro-silica fume or the superfine limestone powder and the first-grade fly ash and the superfine limestone powder; and the compressive strength of the sprayed concrete can be effectively improved by adding the high-strength and high-modulus fibers.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The low-resilience shotcrete modified by emulsified asphalt is characterized in that: the material comprises the following raw material components in parts by weight: 435 parts of cement, 70-100 parts of emulsified asphalt, 175-215 parts of water, 787.5-1050 parts of river sand, 700-962.5 parts of limestone, 35 parts of an accelerator and 24-40 parts of a mineral admixture; the cement is P.O42.5 Portland cement, the emulsified asphalt is anionic emulsified asphalt, the accelerator is one or the combination of two of aluminum sulfate and sodium fluoride, and the mineral admixture is one or the combination of more of first-grade fly ash, micro-silica fume and superfine limestone powder.
2. The emulsified asphalt modified low-resilience shotcrete according to claim 1, wherein: the emulsified asphalt modified low-resilience shotcrete comprises 2-6 parts by weight of high-strength and high-modulus fibers, wherein the high-strength and high-modulus fibers are one or a combination of polyvinyl alcohol fibers, polypropylene fibers and PE fibers.
3. The emulsified asphalt modified low-resilience shotcrete as claimed in claim 2, wherein: the length of the polyvinyl alcohol fiber is 3-5 mu m.
4. The emulsified asphalt modified low-resilience shotcrete according to claim 1, wherein: the anionic emulsified asphalt is one or a combination of sulfonate emulsified asphalt, carboxylate emulsified asphalt and sulfate emulsified asphalt.
5. The emulsified asphalt modified low-resilience shotcrete according to claim 1, wherein: the mineral admixture is a combination of micro silica fume and superfine limestone powder, the mass ratio of the micro silica fume to the superfine limestone powder is 2:1, the particle size of the micro silica fume is 0.1-0.2 mu m, and the particle size of the superfine limestone powder is 30-35 mu m.
6. The emulsified asphalt modified low-resilience shotcrete according to claim 1, wherein: the accelerator is a combination of aluminum sulfate and sodium fluoride, and the mass ratio of the aluminum sulfate to the sodium fluoride is 5: 1.
7. A method for preparing the emulsified asphalt modified low-resilience shotcrete according to any one of claims 1 to 6, comprising: the method comprises the following steps:
(1) weighing the raw material components according to a ratio, mixing and sieving river sand and limestone with the aperture of a screen being 4.75-9.5 mm, placing the mixture into a stirring pot, adding cement, uniformly mixing, adding water, stirring for 2min at the stirring speed of 60-80 r/min, adding emulsified asphalt, quickly stirring for 3min at the stirring speed of 120-150 r/min, and finally adding a mineral admixture or adding a mineral admixture and high-strength high-modulus fibers, and quickly stirring for 1.5min at the stirring speed of 120-150 r/min to obtain a mixture A;
(2) pouring the mixture A obtained in the step (1) out of the stirring pot, pouring the mixture A into a hopper of a wet spraying machine, pouring the accelerator into an accelerator pipe, starting the machine, pumping the mixture A to a nozzle of the spraying machine through a mud jacking pump, fusing the mixture A with the accelerator, and spraying with compressed air.
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| CN101255042B (en) * | 2008-04-11 | 2010-09-01 | 清华大学 | Mortar and concrete modified by emulsified asphalt |
| CN101580366A (en) * | 2008-04-11 | 2009-11-18 | 清华大学 | Mortar and concrete modified by emulsified asphalt |
| CN101993225A (en) * | 2010-08-26 | 2011-03-30 | 卢建华 | Cement asphalt (CA) mortar for polymer cement substrate type ballastless track and preparation method thereof |
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