CN117125955A - Quick hardening early strength material applied to emulsified asphalt slurry seal layer and preparation method thereof - Google Patents
Quick hardening early strength material applied to emulsified asphalt slurry seal layer and preparation method thereof Download PDFInfo
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- CN117125955A CN117125955A CN202310726925.3A CN202310726925A CN117125955A CN 117125955 A CN117125955 A CN 117125955A CN 202310726925 A CN202310726925 A CN 202310726925A CN 117125955 A CN117125955 A CN 117125955A
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- 239000000463 material Substances 0.000 title claims abstract description 99
- 239000010426 asphalt Substances 0.000 title claims abstract description 71
- 239000002002 slurry Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000002270 dispersing agent Substances 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 21
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims abstract description 18
- 239000004137 magnesium phosphate Substances 0.000 claims abstract description 18
- 229960002261 magnesium phosphate Drugs 0.000 claims abstract description 18
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims abstract description 18
- 235000010994 magnesium phosphates Nutrition 0.000 claims abstract description 18
- 238000012423 maintenance Methods 0.000 claims abstract description 13
- 239000011159 matrix material Substances 0.000 claims abstract description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 31
- 239000010881 fly ash Substances 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 27
- 239000000395 magnesium oxide Substances 0.000 claims description 22
- 235000012245 magnesium oxide Nutrition 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
- 229910021538 borax Inorganic materials 0.000 claims description 19
- 239000004328 sodium tetraborate Substances 0.000 claims description 19
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 19
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 18
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 17
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 17
- 235000010755 mineral Nutrition 0.000 claims description 17
- 239000011707 mineral Substances 0.000 claims description 17
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 17
- 239000006012 monoammonium phosphate Substances 0.000 claims description 15
- 229920003086 cellulose ether Polymers 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 229910021487 silica fume Inorganic materials 0.000 claims description 14
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 13
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 238000009775 high-speed stirring Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 229920006317 cationic polymer Polymers 0.000 claims description 2
- CDMADVZSLOHIFP-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane;decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 CDMADVZSLOHIFP-UHFFFAOYSA-N 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims description 2
- 238000005056 compaction Methods 0.000 claims 1
- 239000008399 tap water Substances 0.000 claims 1
- 235000020679 tap water Nutrition 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 8
- 230000008439 repair process Effects 0.000 description 6
- 201000010099 disease Diseases 0.000 description 4
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/02—Phosphate cements
- C04B12/025—Phosphates of ammonium or of the alkali or alkaline earth metals
-
- 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
-
- 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 a rapid hardening early-strength material applied to an emulsified asphalt slurry seal layer and a preparation method thereof, belonging to the field of pavement maintenance composite materials. Aiming at the defects of the prior art, the invention provides a slurry seal material capable of rapidly opening traffic, which is prepared from magnesium phosphate cement matrix powder, emulsified asphalt, mixing water, machine-made sand, coarse aggregate and an anti-dispersant, and has the rapid hardening early strength characteristic of MPC and the flexibility of the emulsified asphalt material. The material can be used by simple mixing, has the characteristics of high early strength, short setting time and excellent high temperature resistance, is beneficial to shortening the curing time, and improves the high temperature resistance of the curing place.
Description
Technical Field
The invention belongs to the technical field of pavement maintenance composite materials, and particularly relates to a rapid hardening early-strength material applied to an emulsified asphalt slurry seal layer and a preparation method thereof.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
Asphalt pavement applications are becoming more common on higher grade roads, which have unique viscoelasticity that makes them more sensitive to temperature changes: when the temperature is higher in summer, the material is in a fluid state, low in strength and low in elastic modulus, and is easy to generate rut deformation and other diseases; under the condition of low temperature in winter, the elastic modulus of the asphalt pavement is increased to become a rigid material, so that diseases such as brittle shrinkage cracks and the like are easy to generate; in seasons with more rainwater, asphalt pavement is easy to be damaged by water, so that aggregate is loosened and peeled off, and pits are formed. Worse, asphalt pavement is subjected to repeated effects of vehicle load for a long time and water temperature coupling, so that various diseases are generated more frequently and seriously. The slurry seal technology belongs to a preventive maintenance construction method for surface treatment of pavement. Cracks and depressions often appear on old asphalt pavement, and when the surface is worn, the emulsified asphalt slurry seal mixture is paved into a thin layer on the pavement, and the thin layer is solidified as soon as possible, so that the asphalt concrete pavement is maintained. The thickness of the slurry seal layer is generally below 3cm. The maintenance and repair method aims at recovering the pavement function and preventing further damage, so that the aims of effectively prolonging the service life of the expressway pavement and reducing the repair cost are fulfilled.
When a slurry seal layer is paved on a highway or an urban expressway, high-quality emulsified asphalt or polymer modified emulsified asphalt is selected to increase the bonding strength between asphalt and mineral aggregate. The emulsified asphalt is required to be mixed with the mineral aggregate and not to be isolated in the mixing process, so that the emulsified asphalt has good binding property to the mineral aggregate and is in a good flowing state, and the emulsified asphalt can be quickly solidified after being paved, so that the traffic is opened. The common emulsified asphalt slurry is formed for more than 4-5 hours after being paved, which seriously hinders the time of traffic opening, so that traffic is blocked and traffic safety is threatened.
The chemically combined magnesium phosphate cementing Material (MPC) is a novel inorganic cementing material which is produced by magnesium oxide, soluble phosphate, an additive and a mineral admixture according to a certain proportion through acid-base chemical reaction and physical action under an acidic condition and takes phosphate as a binding phase, and has the characteristics of high early strength, quick setting time and excellent binding performance. In the prior study of the inventor, the emulsified asphalt is combined with the MPC material, and the compounded material has the rigidity of an inorganic material and the flexibility of an organic material, so that the crack pouring material which is environment-friendly and simple and convenient to operate is provided, and the road disease repair time can be effectively shortened. However, the application modes of the slurry seal layer and the crack filling material are obviously different, and the performance requirements of the composite material are also obviously different, and the construction requirements cannot be met by direct transfer, so that the composite material suitable for the slurry seal layer has important research significance.
Disclosure of Invention
Aiming at the technical problems, the invention provides a slurry seal composite material suitable for asphalt pavement maintenance, which has the characteristics of quick hardening and early strength, and has high early strength and short setting time after paving, thereby being beneficial to shortening the construction time of pavement maintenance work.
The technical idea of the invention is as follows:
the invention provides a rapid hardening early-strength material applied to an emulsified asphalt slurry seal layer, which comprises the following raw materials in parts by weight: magnesium phosphate cement matrix powder, emulsified asphalt, mixing water, machine-made sand, coarse aggregate and anti-dispersant;
wherein the magnesium phosphate cement matrix powder is prepared from dead burned magnesium oxide, borax, ammonium dihydrogen phosphate, mineral powder, silica fume and fly ash;
the anti-dispersant comprises cellulose ether and nano SiO 2 Superfine fly ash.
The traditional slurry seal layer material has the defects of poor strength, long strength forming time and insufficient bonding performance in practical application, and is difficult to really achieve the aim of road maintenance. According to the invention, the magnesium phosphate cement matrix Material (MPC) is added into the emulsified asphalt to form an organic-inorganic composite system, water in the emulsified asphalt can be consumed through hydration of the magnesium phosphate cement, and the demulsification speed of the emulsified asphalt can be accelerated by hydration heat released by hydration of the cement, so that the emulsified asphalt can recover the original adhesive property after the demulsification process, and interacts with the MPC material to form a semi-rigid cementing material between the MPC material and the emulsified asphalt, and the strength is formed by the mechanical engagement effect of the MPC-emulsified asphalt system and the jogging effect between the mixture, so that the rapid operation is completed.
Further, emulsified asphalt is added according to 40-70% of the total mass of the MPC, and the total water-cement ratio W/C=0.15-0.45 is adjusted. The mixing amount of the emulsified asphalt is too small, so that the MPC material cannot be completely wrapped, segregation phenomenon occurs, the uniformity of the material is influenced, the mixing amount of the emulsified asphalt is too large, the mechanical property and the setting time of the material are greatly reduced, the material loses the performance advantage of the material, and the material performance advantage is obvious when the mixing amount of the emulsified asphalt is 40% -70% through examination and relevant documents and tests.
Among the anti-dispersant agents, the cellulose ether is hydroxypropyl methylcellulose, which can play a variety of roles in cement-based material systems, including water retention and dispersion, thickening and viscosity increasing, air entraining and lubrication, and retarder action. The previous research results show that when the mixing amount of the cellulose ether is more than 0.15%, the consistency of a material system can be obviously increased, and the mechanical property of the material is reduced. The cellulose ether with low doping amount can well disperse particles in suspension, and improve the stability of the material. Earlier-stage researches show that the mass percentage of cellulose ether in the anti-dispersant in the matrix material is 0.05% -0.5% more reasonable; nano SiO 2 The suspension stability, the bonding strength, the weather resistance and the like of the cement-based material can be improved, and early researches show that when the mixing amount is too high, the mechanical property is adversely affected, and the mixing amount of the nano material in the anti-dispersing agent is 1-3 percent; the superfine fly ash is used as superfine powder, a small amount of the superfine fly ash is doped to improve the stability of the material, the problem that when magnesium and phosphorus are relatively small, magnesium oxide is precipitated under the action of gravity to cause non-uniformity of the material is avoided, meanwhile, the structure compactness of the material can be improved by a certain amount of the fly ash, the flowability and the mechanical property of the material are enhanced, and the recommended doping amount is not more than 20% of the magnesium phosphate cement matrix powder.
The invention also provides a preparation method of the quick-hardening early-strength material, which comprises the steps of adding the MPC dry material and the anti-dispersant into the liquid, mixing, adding coarse aggregate and the like, spreading the mixed material on a road surface to form an asphalt sealing layer, and firmly combining the mixed material with the original road surface through the processes of wrapping, demulsification, water separation, evaporation, solidification and the like to form a dense, firm, wear-resistant and road surface sealing layer, thereby greatly improving the service performance of the road surface.
The beneficial effects of the above technical scheme are:
1. compared with the existing asphalt pavement repair material, the setting time of the slurry seal layer provided by the invention is obviously shortened, the hardening time is controlled within 2 hours, the pavement maintenance construction is effectively shortened, the traffic is opened quickly, and the early strength development is rapid.
2. The slurry seal layer material provided by the invention is prepared from green and environment-friendly raw materials, so that pollution to the environment and underground water is avoided, and green repair is realized.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As introduced by the background technology, the material for asphalt pavement maintenance in the prior art has the defect of long construction time, and in order to solve the technical problems, the invention provides a rapid hardening early-strength material applied to an emulsified asphalt slurry seal layer, which comprises the following specific scheme:
the invention provides a rapid hardening early-strength material applied to an emulsified asphalt slurry seal layer, which comprises the following raw materials in parts by weight: 21-50 parts of magnesium phosphate cement matrix powder, 10-25 parts of emulsified asphalt, 5-15 parts of mixing water, 5-20 parts of machine-made sand, 40-60 parts of coarse aggregate and 0.5-1 part of anti-dispersant;
the magnesium phosphate cement powder is prepared from 10-20 parts of re-burned magnesium oxide, 1-4 parts of borax, 5-10 parts of monoammonium phosphate, 0-3 parts of mineral powder, 0-3 parts of silica fume and 5-10 parts of fly ash.
Aiming at the first aspect, the invention also provides the following preferable technical scheme:
emulsified asphalt: the emulsified asphalt is cationic polymer modified emulsified asphalt with the solid content of 55-60 percent, and accords with the BCR type regulation in micro surfacing and slurry seal technical guidelines (JTG/T F40-02-2005).
Mixing water: mixing water, namely mixing the components and using the mixed water, wherein the mixed water can be divided into drinking water, surface water, underground water, seawater and industrial wastewater after proper treatment or disposal according to water sources; in general, the source of the mixing water has little influence on the strength of the concrete material, and a technician can perform routine selection according to building standard requirements.
Machine-made sand: the machine-made sand is processed by a sand making machine and other accessory equipment, and compared with river sand, the machine-made sand has little influence on the performance of the MPC material mixture. Meanwhile, the machine-made sand has a series of advantages of energy conservation, emission reduction, small pollution, low manufacturing cost and the like, so that the machine-made sand is better used as aggregate in the system. The grain size of the machine-made sand is 40-80 meshes.
Coarse aggregate: the invention preferably adopts basalt with better suitability with cationic emulsified asphalt, adopts a framework compact structure SMA-13 for grading, and screens aggregates according to JTG E42-2005 Highway engineering aggregate test procedure.
Anti-dispersant: the anti-dispersant comprises the following components in parts by weight: cellulose ether 0.05-0.15 parts, nano SiO 2 1-3 parts of superfine fly ash and 0-5 parts of superfine fly ash. Wherein the ultrafine fly ash has the function of maintaining the stability of slurry, has less influence on the fluidity, and is used for celluloseEthers and nano SiO 2 After the addition, the additive plays an auxiliary role, and if the mobility of the construction site has certain requirements, the mixing amount of superfine fly ash can be increased and the cellulose ether and nano SiO can be reduced 2 Is added to the mixture.
The invention also provides a preferable scheme as follows:
re-burning magnesium oxide: the re-burned magnesia adopted by the invention is obtained by calcining magnesite at high temperature, crushing and grinding, and has light yellow appearance, purity of 90% or above and fineness of not more than 200 meshes; in a specific example, the purity of the magnesium oxide is about 91%.
Borax: borax is used as retarder in the material, borax decahydrate is mostly selected as crystalline white powder, and the density is 1.72g/cm 3 The purity is more than 95 percent.
Ammonia dihydrogen phosphate: technical grade, white powder particles, NH 4 H 2 PO 4 The content is 99%.
Mineral powder: the fineness is less than 1 μm and accounts for more than 80%, and the average particle diameter is 0.1-0.3 μm.
Silica fume: the average grain size of the silica fume is 0.1-0.15 mu m.
Fly ash: the average grain size distribution is about 8-20 mu m, the specific surface area is 300-600 m 2 /kg; further, coarse aggregate is added according to 1.25-4 times of the total mass of the magnesium phosphate cement matrix powder, crushed stone with smaller particle size and smaller difference is selected as the coarse aggregate (the particle size requirement of the crushed stone in the road maintenance standard can be referred), the excessive addition of the coarse aggregate can cause excessive difference of the uniformity of the original asphalt pavement and the repair area, and the pavement has poor skid resistance; the coarse aggregate is too large in proportion, so that the material cannot wrap the coarse aggregate, the coagulation performance among the aggregates is affected, and the performance of the coarse aggregate is excellent when the quality of the coarse aggregate is 1.25-4 times of that of the MPC.
According to a second aspect of the present invention, there is provided a method for preparing the rapid hardening early strength material according to the first aspect, comprising the steps of:
mixing monoammonium phosphate, borax, re-burned magnesia, mineral powder, silica fume and fly ash according to a certain proportion to prepare an MPC dry material; mixing emulsified asphalt and mixing water, stirring at a low speed, slowly adding MPC dry material and anti-dispersant, and fully and uniformly mixing to form MPC-EA cementing material;
then adding machine-made sand and stirring at high speed to form MPC-EA mortar; and finally adding coarse aggregate, stirring at a high speed to prepare an MPC-EA mixture, and paving the MPC-EA mixture on a pavement to form the slurry seal.
Preferably, the rotating speed of the low-speed stirring is 140+/-5 r/min, and the stirring time is 0.1-1 min.
Preferably, the MPC dry material and the anti-dispersant are added at a slow and uniform speed, and in a preferred scheme, the addition is completed within 0.8-1.2 min, and stirring is continued for 2-4 min after the addition is completed to obtain the MPC-EA cementing material.
Preferably, the high-speed stirring speed is 285+/-3 r/min, and the stirring time is 3-5 min.
The MPC-EA mixture is paved on a road surface, and if necessary, local construction defects can be repaired manually, and the traffic can be opened after natural maintenance for 1.5-2 hours.
Preferably, the MPC-EA mixture is paved and compacted at a speed consistent with the mixing amount, and the thickness of the MPC-EA mixture is not more than 3cm.
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail with reference to specific embodiments.
Example 1
A fast hardening early-strength material for the slurry sealing layer of emulsified asphalt is prepared from the mixture of dead-burned magnesium oxide, ammonium dihydrogen phosphate and borax through proportional mixing, preparing gel material, and mixing with emulsified asphalt and water. The mass fraction of the magnesium phosphate cement-based material is as follows: 15 parts of re-burned magnesia and 5 parts of monoammonium phosphate, wherein the borax mixing amount is 1 part, the fly ash is 5 parts, the mineral powder is 1 part, and the silica fume is 1 part.
In the anti-dispersant, cellulose ether: nano SiO 2 : superfine fly ash = 0.05:1:3.
the mixing amount of the emulsified asphalt is 12 parts; 13 parts of machine-made sand; SMA-13 coarse aggregate, 50 parts; the mixing water was 8 parts.
Mixing monoammonium phosphate, borax, dead burned magnesium oxide, mineral powder, silica fume and fly ash according to a proportion to prepare an MPC dry material; mixing emulsified asphalt and mixing water, stirring for 1min at a low speed, slowly adding MPC dry material and anti-dispersant, adding in 0.8-1.2 min, continuously stirring for 2-4 min after adding, and fully and uniformly mixing to form MPC-EA cementing material;
then adding machine-made sand and stirring at high speed to form MPC-EA mortar; finally adding coarse aggregate, stirring at high speed for 4min to prepare MPC-EA mixture, and spreading the MPC-EA mixture on a pavement to form the slurry seal; the stirring process is carried out in a planetary mortar stirrer, and the rotation speed of high-speed stirring is 285+/-3 r/min and the rotation speed of low-speed stirring is 140+/-5 r/min by adopting an instrument rotation mode.
After being stirred uniformly according to the mixing method, the working time is about 40 minutes, and the mixture is spread uniformly and compacted on a road section to be maintained. And (5) placing warning objects, and naturally curing for 2 hours to open traffic.
Example 2
The specific mode of the embodiment is different from the embodiment 1 only in the proportion fraction of the following materials, the operation steps and the material composition are basically consistent, the re-burned magnesium oxide, the monoammonium phosphate and the borax are uniformly mixed to prepare a cementing material, and the cementing material is mixed with emulsified asphalt and water to obtain the MPC-emulsified asphalt composite system. The mass fraction of the magnesium phosphate cement-based material is as follows: 20 parts of re-burned magnesia and 7 parts of monoammonium phosphate, wherein the borax doping amount is 1.2 parts, the fly ash is 10 parts, the mineral powder is 0 part, and the silica fume is 2 parts.
In the anti-dispersant, cellulose ether: nano SiO 2 : superfine fly ash = 0.1:1:5.
the mixing amount of the emulsified asphalt is 20 parts; 10 parts of machine-made sand; 60 parts of SMA-13 aggregate; the mixing water was 8 parts.
After being stirred uniformly by the mixing method in the embodiment 1, the working time is about 23min, and the mixture is spread uniformly and compacted on the section to be maintained. And (5) placing warning objects, and naturally curing for 1.5 hours to open traffic.
Example 3
The specific mode of the embodiment is different from the embodiment 1 only in the proportion fraction of the following materials, the operation steps and the material composition are basically consistent, the re-burned magnesium oxide, the monoammonium phosphate and the borax are uniformly mixed to prepare a cementing material, and the cementing material is mixed with emulsified asphalt and water to obtain an MPC-emulsified asphalt composite system: the mass fraction of the magnesium phosphate cement-based material is as follows: 20 parts of re-burned magnesia and 5 parts of monoammonium phosphate, wherein the borax mixing amount is 1.6 parts, the fly ash is 15 parts, the mineral powder is 2 parts, and the silica fume is 2 parts.
In the anti-dispersant, cellulose ether: nano SiO 2 : superfine fly ash = 0.1:2:0.
the mixing amount of the emulsified asphalt is 25 parts; 15 parts of machine-made sand; 40 parts of SMA-13 aggregate; 10 parts of mixing water.
After being stirred uniformly according to the mixing method in the embodiment 1, the working time is about 20min, and the mixture is spread uniformly and compacted on the road section to be maintained. And (5) placing warning objects, and naturally curing for 1.5 hours to open traffic.
Example 4
The specific mode of the embodiment is different from the embodiment 1 only in the proportion of the following materials, the operation steps and the material composition are basically consistent, the cement-based material of the magnesium phosphate cement of the MPC-emulsified asphalt composite system is prepared by uniformly mixing the burned magnesium oxide, the monoammonium phosphate and the borax, and then mixing the cement-based material with emulsified asphalt with the solid content of 60% and water, wherein the mass percentage of the cement-based material is as follows: 15 parts of re-burned magnesia and 5 parts of monoammonium phosphate, wherein the borax mixing amount is 2 parts, the fly ash is 20 parts, the mineral powder is 5 parts, and the silica fume is 5 parts.
In the anti-dispersant, cellulose ether: nano SiO 2 : superfine fly ash = 0.15:3:10.
the mixing amount of the emulsified asphalt is 30 parts; 15 parts of machine-made sand; 45 parts of SMA-13 aggregate; 10 parts of mixing water.
After being stirred uniformly by the mixing method in the embodiment 1, the working time is about 50 minutes, and the mixture is spread uniformly and compacted on a road section to be maintained. And (5) placing warning objects, and naturally curing for 2 hours to open traffic.
Example 5
The specific mode of the embodiment is different from the embodiment only in the proportion of the following materials, the operation steps and the material composition are basically consistent, and the cement-based material of the cementing material magnesium phosphate is prepared by uniformly mixing the re-burned magnesium oxide, the monoammonium phosphate and the borax: 10 parts of re-burned magnesia, 5 parts of monoammonium phosphate, 1 part of borax, 20 parts of fly ash, 7 parts of mineral powder and 5 parts of silica fume.
In the anti-dispersant, cellulose ether: nano SiO 2 : superfine fly ash = 0.15:2:5.
the mixing amount of the emulsified asphalt is 25 parts; 15 parts of machine-made sand; SMA-13 aggregate, 50 parts; the mixing water is 15 parts.
After being stirred uniformly according to the mixing method in the embodiment 1, the working time is about 60 minutes, and the mixture is spread uniformly and compacted on the road section to be maintained. And (5) placing warning objects, and naturally curing for 2 hours to open traffic.
The invention mainly aims at preliminary working performance tests of working time (namely, the time when slurry loses fluidity), hardening time, unconfined compressive strength, bending strength, bonding strength with an old matrix and the like of the material because of the rapid hardening property of the material.
Specific performance parameter test values for examples 1 to 5 are shown in table 1:
TABLE 1 Material Performance test results
According to the test data, the setting time of the material can be realized by adjusting the mixing ratio, the setting time can be adjusted within 30-70 min, the strength of the mixture is obviously higher than that of mortar under the same proportion, the composite material can adapt to different construction requirements under different roads in different environments, the maintenance condition is simple, the influence on traffic is small, and the economic loss and the potential safety hazard are greatly reduced; and the quick hardening early strength of the MPC material enables the strength within 1h to develop rapidly, and can provide a new choice for the field of emulsified asphalt slurry seal materials.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The quick hardening early strength material applied to the emulsified asphalt slurry seal layer is characterized by comprising the following raw materials in parts by weight: 21-50 parts of magnesium phosphate cement matrix powder, 10-25 parts of emulsified asphalt, 5-15 parts of mixing water, 5-20 parts of machine-made sand, 40-60 parts of coarse aggregate and 0.5-1 part of anti-dispersant;
the magnesium phosphate cement powder is prepared from 10-20 parts of re-burned magnesium oxide, 1-4 parts of borax, 5-10 parts of monoammonium phosphate, 0-3 parts of mineral powder, 0-3 parts of silica fume and 5-10 parts of fly ash.
2. A rapid hardening early strength material for an emulsified asphalt slurry seal according to claim 1,
the emulsified asphalt is cationic polymer modified emulsified asphalt with the solid content of 55-60 percent, and accords with the BCR type regulation in micro-surfacing and slurry seal technical guidelines (JTG/T F40-02-2005);
the mixing water is tap water;
the grain diameter of the machine-made sand is 40-80 meshes;
the coarse aggregate is basalt, SMA-13 is selected for grading, and aggregate is screened according to JTG E42-2005 Highway engineering aggregate test procedure.
3. The rapid hardening early strength material applied to an emulsified asphalt slurry seal layer according to claim 1, wherein the anti-dispersant comprises the following components in parts by weight: cellulose ether 0.05-0.15 parts, nano SiO 2 1-3 parts of superfine fly ash and 0-5 parts of superfine fly ash.
4. The rapid hardening early strength material for an emulsified asphalt slurry seal layer according to claim 1, wherein the re-burned magnesia is obtained by calcining magnesite at high temperature, crushing and grinding, and has a light yellow appearance, purity of 90% or above, fineness of not more than 200 meshes and purity of 91%;
the borax adopts borax decahydrate as crystalline white powder with density of 1.72g/cm 3 The purity is more than 95 percent.
5. The rapid hardening early strength material for an emulsified asphalt slurry seal according to claim 1, wherein said monoammonium phosphate is technical grade, white powder particles, NH 4 H 2 PO 4 The content is 99%;
the fineness of the mineral powder is less than 1 mu m and accounts for more than 80%, and the average grain diameter is 0.1-0.3 mu m.
6. The rapid hardening early strength material for an emulsified asphalt slurry seal layer according to claim 1, wherein the silica fume has an average particle diameter of 0.1 to 0.15 μm;
the average particle size distribution of the fly ash is 8-20 mu m, and the specific surface area is 300-600 m 2 /kg。
7. The rapid hardening early-strength material applied to an emulsified asphalt slurry seal layer according to claim 1, wherein the coarse aggregate is added according to 1.25-4 times of the total mass of magnesium phosphate cement matrix powder, and the coarse aggregate selects broken stone with smaller particle size and smaller difference, and refers to the broken stone particle size requirement in a road maintenance standard.
8. The method for preparing the rapid hardening early strength material according to any one of claims 1 to 7, comprising the steps of: mixing monoammonium phosphate, borax, re-burned magnesia, mineral powder, silica fume and fly ash according to a certain proportion to prepare an MPC dry material; mixing emulsified asphalt and mixing water, stirring at a low speed, slowly adding MPC dry material and anti-dispersant, and fully and uniformly mixing to form MPC-EA cementing material;
then adding machine-made sand and stirring at high speed to form MPC-EA mortar; and finally adding coarse aggregate, stirring at a high speed to prepare an MPC-EA mixture, and paving the MPC-EA mixture on a pavement to form the slurry seal.
9. The method for preparing a rapid hardening early-strength material according to claim 8, wherein the rotation speed of the low-speed stirring is 140+ -5 r/min, the stirring time is 0.1-1 min, the rotation speed of the high-speed stirring is 285+ -3 r/min, and the stirring time is 3-5 min;
or, the MPC dry material and the anti-dispersant are added within 0.8-1.2 min, and stirring is continued for 2-4 min after the addition is finished, so as to obtain the MPC-EA cementing material.
10. The method for preparing the rapid hardening early-strength material according to claim 8, wherein the MPC-EA mixture is paved on a road surface, and natural curing is carried out for 1.5-2 hours, so that the traffic can be opened;
or, the paving compaction speed of the MPC-EA mixture is consistent with the mixing amount, and the thickness of the MPC-EA mixture is not more than 3cm.
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