CN110668754B - New and old pavement base course splicing interface treatment material and preparation method thereof - Google Patents
New and old pavement base course splicing interface treatment material 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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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C04B20/023—Chemical treatment
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- 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
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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Abstract
The invention discloses a new and old pavement base course splicing interface treatment material, belongs to the field of road engineering, and aims to provide a new and old pavement base course splicing interface treatment material for expressway reconstruction and expansion engineering. The technical scheme is characterized by comprising, by weight, 50-100 parts of organic silicon modified polyurethane emulsion, 1-3 parts of organic modified rectorite, 100-200 parts of cement, 0.5-1.5 parts of water reducing agent, 20-50 parts of water and 0.5-2.5 parts of composite retarder. The invention provides a new and old pavement base course splicing interface treatment material, which is used for solving the problems of the existing base course splicing interface material and has the advantages of simple preparation process, stable performance, high bonding strength and good splicing effect.
Description
Technical Field
The invention relates to the field of road engineering, in particular to a new and old pavement base splicing interface treatment material for highway reconstruction and extension projects.
Background
In the expressway reconstruction and extension project, because the original road surface has longer transit time and the roadbed is completely solidified, the extension road surface belongs to a newly-built road surface structure, and obvious settlement exists after construction, so that uneven settlement of a new road surface and an old road surface can be caused, the road surface structure is damaged, and the adverse effect on the extension project caused by settlement can be avoided or delayed by effective road surface splicing. Engineering experience shows that the key factors influencing the splicing effect of the cement stabilized macadam foundation layer mainly comprise two factors: firstly, the vertical interface bonding effect of the new and old cement stabilized macadam base is achieved; secondly, the dosage, the segregation and the like of the coarse aggregate of the cement stabilized macadam are paved at the splicing position. At present, effective measures capable of guaranteeing the splicing construction quality of the cement stabilized macadam base layer are lacked in engineering construction, and corresponding construction technical specifications and requirements are not provided.
The existing domestic finished expressway reconstruction and extension projects mostly adopt a splicing technology of excavating steps and coating interface materials, and the splicing effect of the cement stabilized macadam base is improved. The interface material is used as a key component in the splicing process of the new and old road base layers, and the quality of the performance and the variety of the interface material directly influences the quality and the cost of engineering. The interface material commonly used at present mainly comprises two-component aqueous high-molecular epoxy emulsion, cement paste and emulsified asphalt.
The double-component aqueous high-molecular epoxy emulsion has unstable performance and is greatly influenced by stirring, cement clusters can appear when stirring is not strong in the process of preparing cement paste, the cement clusters can inhibit cement paste from being bonded with a base layer insufficiently when being coated, diseases such as hollowing and foaming are easy to appear, and the bonding effect of the cement paste is greatly reduced; in addition, the curing time of the two-component material is relatively short, so that the two-component material can be cured to form strength within 1-2 hours generally. For reconstruction and extension projects, treatment of splicing interfaces of a new base layer and an old base layer is usually completed before the new base layer is paved, and after a double-component material is adopted for coating, the new base layer is paved before the material is solidified, namely within 1-2 hours. Due to the fact that extension engineering is complex, paving time of the base layer is affected by multiple factors such as mixture production, transportation and paving equipment, the paving time is difficult to guarantee, the new base layer is paved after the interface treatment material is solidified, the splicing interface bonding effect of the new base layer and the old base layer is poor, and integrity of the widened base layer of the highway is affected.
The cement paste has small bonding strength to a concrete interface, so that the splicing effect of cement stabilized macadam base layers of new and old pavements is not ideal; in the process of freeze thawing, the asphaltene of the emulsified asphalt can seep out, and the bonding condition and the strength of the abutted seams are influenced.
In view of the above, the invention provides a new and old pavement base course splicing interface treatment material, which is used for solving the problems of the existing base course splicing interface material and aims to provide a new and old pavement base course splicing interface treatment material with simple preparation process, stable performance, good flexibility, large bonding strength and good splicing effect.
Disclosure of Invention
The first purpose of the invention is to provide a new and old pavement base splicing interface treatment material which has stable performance, higher bonding strength, better water stability and fatigue cracking resistance, thereby ensuring the durability of the highway after expansion; the second purpose of the invention is to provide a preparation method of the treatment material for the splicing interface of the new and old road base layers, which is simple, environment-friendly and has industrial value.
The technical purpose of the invention is realized by the following technical scheme:
the new and old pavement base course splicing interface treatment material comprises, by weight, 50-100 parts of organic silicon modified polyurethane emulsion, 1-3 parts of organic modified rectorite, 100-200 parts of cement, 0.5-1.5 parts of a water reducing agent, 20-50 parts of water and 0.5-2.5 parts of a composite retarder. Organic modifier is adopted to carry out organic modification on rectorite, so that the compatibility between the rectorite and polyurethane can be improved; meanwhile, molecular chains of the organic modifier are arranged among the rectorite sheets in a certain mode, so that the crystal face spacing of the rectorite is enlarged, the intercalation/peeling reaction of polyurethane and the rectorite is facilitated, the polyurethane molecular chains are inserted into the rectorite sheets, the excellent performances of the polyurethane and the rectorite can be comprehensively complemented, and the bonding performance, the heat resistance, the corrosion resistance and the mechanical performance of the material are improved.
Further, the cement is any one or a mixture of more of ordinary portland cement, slag portland cement or fly ash portland cement.
Further, the water reducing agent is one or a mixture of more of a polycarboxylate water reducing agent or a sulfonated acetone-formaldehyde condensate. The addition of the polycarboxylic acid high-efficiency water reducing agent can improve the workability of the treatment material at the splicing interface and simultaneously reduce the shrinkage of the treatment material at the splicing interface.
Further, the composite retarder is formed by compounding an organic retarder and an inorganic retarder, wherein the organic retarder is any one of calcium saccharate, glucose or citric acid, and the inorganic retarder is any one of phosphate, borax or calcium fluosilicate. The composite retarder is compounded by organic and inorganic retarders, so that the setting time is effectively delayed. The organic retarder has stronger solid-liquid surface activity, can be adsorbed on the surface of the polyurethane emulsion to form a solvent adsorption layer, and prevents latex particles from contacting and coagulating to demulsify, so that demulsification and solidification of the polyurethane emulsion are effectively delayed; the inorganic retarder is electrolyte salt, can ionize in aqueous solution to bring out sodium ions, calcium ions and the like, and delays the formation of cement hydration products, namely calcium hydroxide and ettringite, so that the initial setting time of cement is prolonged. The composite retarder can greatly prolong the demulsification time of polyurethane emulsion and the initial setting time of cement, reserve sufficient time for paving a new base layer, ensure that the new base layer is paved after interface materials are solidified, facilitate the bonding of the new base layer and the old base layer to form a whole, and is favorable for the durability of the base layer after the expansion.
Further, the polyurethane emulsion comprises the following components in percentage by mass: 90-100 parts of polyether polyol, 0-10 parts of organic silicon, 70-100 parts of polyisocyanate, 5-15 parts of hydrophilic chain extender, 3-7 parts of salt forming agent, 300-500 parts of water and 0.05-0.1 part of polyurethane emulsion defoaming agent.
Further, the polyether polyol is polyether polyol with average functionality not less than 3 and average molecular weight of about 8000, and can be one or two of polytetrahydrofuran ether diol, tetrahydrofuran-propylene oxide ether copolymerized diol or polypropylene oxide ether diol.
Furthermore, the organic silicon is polysiloxane, and is one or two mixtures of polymethylsiloxane, double-tail dihydroxy siloxane and bis-hydroxybutyl polydimethylsiloxane.
Further, the isocyanate is selected from any one of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polyphenyl polymethylene polyisocyanate (PAPI), or MDI/TDI system isocyanate.
Further, the hydrophilic chain extender is any one or a mixture of 1, 4-butanediol-2-sodium sulfonate or dimethylolpropionic acid. The hydrophilic chain extender is added into the synthesized organic silicon modified polyurethane prepolymer, and the hydrophilic group is introduced into the organic silicon modified polyurethane prepolymer, so that the organic silicon modified polyurethane is uniformly dispersed in water, and a high-boiling-point solvent is not required to be introduced in the process of preparing the organic silicon modified polyurethane emulsion, so that the organic silicon modified polyurethane emulsion is green and environment-friendly.
Further, the salt forming agent is selected from any one of triethylamine, dimethylethanolamine or sodium hydroxide.
Furthermore, the polyurethane emulsion defoaming agent comprises mineral oil, special polyether ester, a dispersing agent and the like. The addition of the defoaming agent in the organosilicon modified polyurethane emulsion can not only quickly eliminate bubbles generated in the preparation process of the organosilicon modified polyurethane emulsion, but also can break the bubbles adsorbed at the interface of concrete, and has the effect of improving the compactness and the bonding strength of the interface transition region.
Further, the organic modified rectorite comprises, by mass, 25-35 parts of rectorite, 10-15 parts of an organic modifier and 500-700 parts of purified water. Adding cement into the organic rectorite modified polyurethane emulsion, on one hand, utilizing water (without additional water) in the organic silicon modified polyurethane emulsion to realize hydration of the cement, and forming a network interpenetrating multi-element composite structure with the rectorite and the polyurethane after the cement is hydrated(ii) a On the other hand, Ca (OH) enriched in-NCO groups in the organosilicon modified polyurethane emulsion and the interface of the base layer concrete 2 Reacting to form carbamate with stable performance and reduce Ca (OH) at the interface 2 The enrichment degree, and the generated carbamate can also fill the pores at the interface of the concrete, so that the compactness and the bonding strength of the interface transition region are further improved.
Furthermore, the rectorite is one or a mixture of more of sodium-based rectorite, calcium-based rectorite or magnesium-based rectorite.
Further, the organic modifier is selected from any one or a mixture of any two of octadecyl dimethyl benzyl ammonium chloride, hexadecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium chloride or gamma-propyl trimethoxy silane.
Further, the preparation method of the treatment material for the splicing interface of the new and old pavement base course comprises the following steps:
s1, preparing organic silicon modified polyurethane emulsion: putting 90-100 parts of polyether polyol, 0-10 parts of organic silicon, 70-100 parts of polyisocyanate and 5-15 parts of hydrophilic chain extender into a reaction kettle with the temperature set to be 70-90 ℃, and reacting for 4-5 hours under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding 3-7 parts of salt forming agent, 300-500 parts of water and 0.05-0.1 part of special defoaming agent for polyurethane emulsion into the organic silicon modified polyurethane prepolymer for mixing reaction to obtain organic silicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding 25-35 parts of rectorite with the cation exchange capacity of 90mmol/100g into 500-700 parts of purified water, and stirring for 20-25 min at 75-85 ℃ to uniformly disperse the rectorite to obtain a homogeneous system of the rectorite and the water; adding 10-15 parts of organic modifier into 50-15 parts of purified water, uniformly stirring, then adding into the homogeneous system of rectorite and water, and stirring for 2-4 hours at 75-85 ℃ to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion by using a vacuum pump to obtain a filter cake, washing the filter cake with purified water, repeating the washing for 4-6 times, then placing the filter cake in a vacuum drying oven at 80-100 ℃ for fully drying, grinding the filter cake into powder, and sieving the powder by using a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: slowly adding 1-3 parts of organic modified rectorite into 50-100 parts of organic silicon polyurethane emulsion, and stirring for 15-20 min to obtain organic rectorite modified organic silicon polyurethane emulsion; and then mixing and stirring the prepared organic rectorite modified organic silicon polyurethane emulsion, 20-50 parts of water, 0.5-1.5 parts of water reducing agent and 0.5-2.5 parts of composite retarder uniformly, and finally adding 100-200 parts of cement and continuing stirring for 2-5 min to obtain the new and old pavement level splicing interface treatment material.
In conclusion, the invention has the following beneficial effects:
1. the composite retarder used in the invention has the advantages of wide raw materials, low price and excellent retarding effect, and the dosage of the composite retarder can be adjusted according to the on-site construction requirement, so as to meet the requirement of the time required by construction.
2. According to the invention, the polyurethane modifier is prepared from the ultra-high molecular weight polyether polyol, so that the brittleness of the traditional polyurethane can be improved, the material adhesion flexibility and deformation coordination at the splicing interface of the new and old pavement base layers are improved, and the cracking resistance of the splicing part of the new and old pavement base layers in the extension project is facilitated.
3. The invention adopts the organic silicon and organic rectorite composite modified polyurethane, and has the following advantages: 1) the organic silicon has multiple excellent performances of weather aging resistance, ozone resistance, high and low temperature resistance, good bonding performance and the like, and the excellent performances of the organic silicon modified polyurethane and the organic silicon modified polyurethane can be combined, so that the bonding performance, the high and low temperature resistance and the durability of the treatment material for the splicing interface of the new and old pavement base layers are improved. 2) And the organic rectorite, a hydration product after the hydration of the cement and polyurethane form a network interpenetrating multi-element composite structure, which is beneficial to improving the compactness and the bonding strength of the splicing interface part of the new and old pavement base layers. Comprehensively, the organic silicon and the organic rectorite are compositely modified, so that the prepared polyurethane modifier has excellent bonding performance, durability and high and low temperature resistance, the prepared splicing interface treatment material has better comprehensive performance, the bonding of a new base layer and an old base layer in the extension engineering and the durability of a splicing and combining part of the new base layer and the old base layer are facilitated, and the service life of a road is prolonged.
4. Compared with an epoxy latex interface agent, the prepared material for treating the splicing interface of the new and old pavement base layers has better bonding performance, longer curing initial setting time and stable performance; the prepared splicing interface treatment material can form polymer slurry with good bonding property after being coated on the splicing interface, and the slurry is continuous in film forming, free of obvious bubbles and not easy to fall off and swell. Through comparison tests, the splitting strength of the cement stabilized macadam test piece is remarkably improved after the splicing interface treatment material prepared by the invention is used.
5. The preparation process is simple, the reaction conditions are easy to control, the raw materials are cheap, and the method is suitable for industrial development; no solvent is needed, no pollution is caused to the environment, and the environment is protected.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described below.
Example 1: new and old pavement base course splicing interface treatment material and preparation method thereof
A new and old pavement base course splicing interface treatment material comprises the following components in parts by mass:
50 parts of organic silicon modified polyurethane emulsion, 1 part of organic modified rectorite, 100 parts of ordinary portland cement, 0.5 part of polycarboxylic acid water reducing agent, 0.2 part of sugar calcium and 0.3 part of phosphate.
The polyurethane emulsion comprises the following components in parts by weight:
95 parts of polytetrahydrofuran ether dihydric alcohol, 5 parts of organic silicon, 70 parts of diphenylmethane diisocyanate, 5 parts of 1, 4-butanediol-2-sodium sulfonate, 3 parts of triethylamine, 300 parts of water and 0.05 part of a polyurethane emulsion defoaming agent.
The organic modified rectorite comprises the following components in parts by weight:
25 parts of sodium-based rectorite, 10 parts of octadecyl dimethyl benzyl ammonium chloride and 500 parts of water.
A preparation method of a new and old pavement base course splicing interface treatment material comprises the following steps:
s1, preparing organic silicon modified polyurethane emulsion: placing 95 parts of polyether polyol, 5 parts of organic silicon, 70 parts of diphenylmethane diisocyanate and 5 parts of 1, 4-butanediol-2-sodium sulfonate in a reaction kettle with the temperature set to 70 ℃, and reacting for 5 hours under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding 3 parts of triethylamine, 300 parts of water and 0.05 part of polyurethane emulsion defoaming agent into the polyorganosiloxane modified polyurethane prepolymer for mixing reaction to obtain organosilicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding 25 parts of sodium-based rectorite with the cation exchange capacity of 90mmol/100g into 500 parts of purified water, and stirring for 20min at 75 ℃ to uniformly disperse the sodium-based rectorite to obtain a homogeneous system of the sodium-based rectorite and the water; adding 10 parts of octadecyl dimethyl benzyl ammonium chloride into 5 parts of purified water, uniformly stirring, then adding into the homogeneous system of the rectorite and the water, and stirring for 2 hours at the temperature of 75 ℃ to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion by using a vacuum pump to obtain a filter cake, washing the filter cake by using purified water, repeating the washing for 4-6 times, then placing the filter cake in a vacuum drying oven at 80 ℃ for fully drying, grinding the filter cake into powder, and sieving the powder by using a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: slowly adding 1 part of organic modified rectorite into 50 parts of organic silicon modified polyurethane emulsion, and stirring for 15min to obtain organic rectorite modified organic silicon polyurethane emulsion; and then adding 20 parts of water, 0.5 part of polycarboxylic acid water reducing agent, 0.2 part of sugar calcium and 0.3 part of phosphate into the organic rectorite modified polyurethane emulsion, stirring for 1min, finally adding 100 parts of ordinary portland cement, and continuously stirring for 3min to obtain the new and old road splicing interface treatment material.
Example 2: new and old pavement base course splicing interface treatment material and preparation method thereof
A new and old pavement base course splicing interface treatment material comprises the following components in parts by weight: 100 parts of organic silicon modified polyurethane emulsion, 3 parts of organic modified rectorite, 200 parts of portland slag cement, 1.5 parts of sulfonated acetone-formaldehyde condensate, 1 part of glucose and 0.5 part of borax.
The organic silicon modified polyurethane emulsion comprises the following components in percentage by mass: 92 parts of tetrahydrofuran-propylene oxide ether copolymerized dihydric alcohol, 8 parts of organic silicon, 100 parts of polyphenyl polymethylene polyisocyanate, 15 parts of dimethylolpropionic acid, 7 parts of dimethylethanolamine, 500 parts of water and 0.1 part of polyurethane emulsion defoaming agent.
The organic modified rectorite comprises the following components in parts by weight:
35 parts of calcium-based rectorite, 15 parts of hexadecyl trimethyl benzyl ammonium chloride and 700 parts of water.
The preparation method of the joint interface treatment material for the new and old road base course comprises the following steps:
s1, preparing organic silicon modified polyurethane emulsion: putting 92 parts of tetrahydrofuran-propylene oxide ether copolymerized dihydric alcohol, 8 parts of organic silicon, 100 parts of polyphenyl polymethylene polyisocyanate and 15 parts of dimethylolpropionic acid into a reaction kettle with the temperature set to be 90 ℃, and reacting for 5 hours under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding 7 parts of dimethylethanolamine, 500 parts of water and 0.1 part of polyurethane emulsion defoamer into the organic silicon modified polyurethane prepolymer for mixing reaction to obtain organic silicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding 35 parts of calcium-based rectorite with the cation exchange capacity of 90mmol/100g into 650 parts of purified water, and stirring for 25min at 85 ℃ to uniformly disperse the calcium-based rectorite to obtain a homogeneous system of the calcium-based rectorite and the water; adding 5 parts of hexadecyl trimethyl ammonium chloride into 15 parts of purified water, uniformly stirring, then adding into the homogeneous system of the rectorite and the water, and stirring for 4 hours at 85 ℃ to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion by using a vacuum pump to obtain a filter cake, washing the filter cake with purified water, repeating the washing for 4-6 times, then placing the filter cake in a vacuum drying oven at 80-100 ℃ for fully drying, grinding the filter cake into powder, and sieving the powder by using a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: slowly adding 3 parts of organic modified rectorite into 100 parts of organic silicon modified polyurethane emulsion, and stirring for 20min to obtain organic rectorite modified organic silicon polyurethane emulsion; and adding 50 parts of water, 1.5 parts of sulfonated acetone-formaldehyde condensate, 1.5 parts of glucose and 1 part of borax into the organic rectorite modified polyurethane emulsion, stirring for 1min, finally adding 200 parts of slag cement, and continuously stirring for 4min to obtain the new and old pavement level splicing interface treatment material.
Embodiment 3. a new and old pavement base course splicing interface treatment material comprises, by weight, 75 parts of an organic silicon modified polyurethane emulsion, 2 parts of an organic modified rectorite, 150 parts of fly ash portland cement, 1 part of a water reducing agent, 1 part of citric acid and 1 part of calcium fluosilicate.
The organic silicon modified polyurethane emulsion comprises the following components in percentage by mass: 90 parts of polyoxypropylene ether dihydric alcohol, 10 parts of organic silicon, 90 parts of toluene diisocyanate, 4 parts of 1, 4-butanediol-2 sodium sulfonate, 5 parts of dimethylolpropionic acid, 7 parts of sodium hydroxide, 400 parts of water and 0.075 part of a polyurethane emulsion defoaming agent.
The organic modified rectorite comprises the following components in parts by weight:
30 parts of magnesium-based rectorite, 15 parts of hexadecyl trimethyl bromide and 400 parts of water.
The preparation method of the joint interface treatment material for the new and old road base course comprises the following steps:
s1, preparing organic silicon modified polyurethane emulsion: placing 90 parts of polyoxypropylene ether dihydric alcohol, 10 parts of organic silicon, 90 parts of toluene diisocyanate, 4 parts of 1, 4-butanediol-2 sodium sulfonate and 5 parts of dimethylolpropionic acid in a reaction kettle with the temperature set to 80 ℃, and reacting for 5 hours under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding 7 parts of sodium hydroxide, 400 parts of water and 0.075 part of polyurethane emulsion defoamer into the organic silicon modified polyurethane prepolymer for mixing reaction to obtain organic silicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding 30 parts of magnesium-based rectorite with the cation exchange capacity of 90mmol/100g into 700 parts of purified water, and stirring for 22min at the temperature of 80 ℃ to uniformly disperse the magnesium-based rectorite to obtain a homogeneous system of the magnesium-based rectorite and the water; adding 15 parts of hexadecyl trimethyl bromide into 15 parts of purified water, uniformly stirring, then adding into the homogeneous system of the rectorite and the water, and stirring for 3 hours at the temperature of 80 ℃ to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion by using a vacuum pump to obtain a filter cake, washing the filter cake by using purified water, repeating the washing for 4-6 times, then placing the filter cake in a vacuum drying oven at 90 ℃ for fully drying, grinding the filter cake into powder, and sieving the powder by using a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: slowly adding 2 parts of organic modified rectorite into 75 parts of organic silicon modified polyurethane emulsion, and stirring for 15-20 min to obtain organic rectorite modified organic silicon polyurethane emulsion; and then adding 40 parts of water, 1 part of polycarboxylic acid water reducing agent, 1 part of citric acid and 1 part of calcium fluosilicate into the organic rectorite modified polyurethane emulsion, stirring for 1.5min, finally adding 150 parts of fly ash Portland cement, and continuously stirring for 4min to obtain the new and old pavement level splicing interface treatment material.
Embodiment 4. splicing interface treatment material for new and old pavement base course and preparation method thereof
A new and old pavement base course splicing interface treatment material comprises the following components in parts by mass:
50 parts of organic silicon modified polyurethane emulsion, 1 part of organic modified rectorite, 100 parts of ordinary portland cement, 0.5 part of polycarboxylic acid water reducer, 0.2 part of calcium saccharate and 0.3 part of phosphate.
The organic silicon modified polyurethane emulsion comprises the following components in parts by weight:
98 parts of polytetrahydrofuran ether dihydric alcohol, 2 parts of organic silicon, 70 parts of a mixture of toluene diisocyanate and diphenylmethane diisocyanate, 5 parts of 1, 4-butanediol-2-sodium sulfonate, 3 parts of triethylamine, 300 parts of water and 0.05 part of a polyurethane emulsion defoaming agent.
The organic modified rectorite comprises the following components in parts by weight:
25 parts of sodium rectorite, 10 parts of octadecyl trimethyl ammonium chloride and 500 parts of water.
A preparation method of a new and old pavement base course splicing interface treatment material comprises the following steps:
s1, preparing organic silicon modified polyurethane emulsion: placing 98 parts of polyether polyol, 2 parts of organic silicon, 70 parts of a mixture of toluene diisocyanate and diphenylmethane diisocyanate and 5 parts of 1, 4-butanediol-2-sodium sulfonate into a reaction kettle with the temperature set to be 70-90 ℃, and reacting for 4-5 hours under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding 3 parts of triethylamine, 300 parts of water and 0.05 part of polyurethane emulsion defoaming agent into the organic silicon modified polyurethane prepolymer for mixing reaction to obtain organic silicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding 25 parts of sodium-based rectorite with the cation exchange capacity of 90mmol/100g into 450 parts of purified water, and stirring for 20min at 75 ℃ to uniformly disperse the sodium-based rectorite to obtain a homogeneous system of the sodium-based rectorite and the water; adding 10 parts of octadecyl trimethyl ammonium chloride into 5 parts of purified water, uniformly stirring, then adding into the homogeneous system of the rectorite and the water, and stirring for 2 hours at the temperature of 75 ℃ to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion by using a vacuum pump to obtain a filter cake, washing the filter cake by using purified water, repeating the washing for 4-6 times, then placing the filter cake in a vacuum drying oven at 80 ℃ for fully drying, grinding the filter cake into powder, and sieving the powder by using a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: slowly adding 1 part of organic modified rectorite into 50 parts of organic silicon modified polyurethane emulsion, and stirring for 15min to obtain organic rectorite modified organic silicon polyurethane emulsion; and then adding 100 parts of ordinary portland cement, 0.5 part of polycarboxylic acid water reducing agent, 0.2 part of calcium saccharate and 0.3 part of phosphate into the organic rectorite modified polyurethane emulsion, and stirring for 3min at room temperature to obtain the new and old road splicing interface treatment material.
Embodiment 5. splicing interface treatment material for new and old pavement base course and preparation method thereof
A new and old pavement base course splicing interface treatment material comprises the following components in parts by weight: 100 parts of organic silicon modified polyurethane emulsion, 3 parts of organic modified rectorite, 200 parts of slag portland cement, 1.5 parts of sulfonated acetone formaldehyde condensate, 1 part of glucose and 0.5 part of borax.
The organic silicon modified polyurethane emulsion comprises the following components in percentage by mass: 94 parts of tetrahydrofuran-propylene oxide ether copolymerized dihydric alcohol, 6 parts of organic silicon, 100 parts of polyphenyl polymethylene polyisocyanate, 15 parts of dimethylolpropionic acid, 7 parts of dimethylethanolamine, 500 parts of water and 0.1 part of polyurethane emulsion defoaming agent.
The organic modified rectorite comprises the following components in parts by weight:
35 parts of calcium-based rectorite, 15 parts of gamma-propyl trimethoxy silane and 700 parts of water.
The preparation method of the joint interface treatment material for the new and old road base course comprises the following steps:
s1, preparing organic silicon modified polyurethane emulsion: placing 94 parts of tetrahydrofuran-propylene oxide ether copolymerized dihydric alcohol, 6 parts of organic silicon, 100 parts of polyphenyl polymethylene polyisocyanate and 15 parts of dimethylolpropionic acid in a reaction kettle with the temperature set to be 90 ℃, and reacting for 5 hours under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding 7 parts of dimethylethanolamine, 500 parts of water and 0.1 part of polyurethane emulsion special defoaming agent into the organic silicon modified polyurethane prepolymer for mixing reaction to obtain organic silicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding 35 parts of calcium-based rectorite with the cation exchange capacity of 90mmol/100g into 650 parts of purified water, and stirring for 25min at 85 ℃ to uniformly disperse the calcium-based rectorite to obtain a homogeneous system of the calcium-based rectorite and the water; adding 5 parts of gamma-propyl trimethoxy silane into 15 parts of purified water, uniformly stirring, then adding into the homogeneous system of the rectorite and the water, and stirring for 4 hours at 85 ℃ to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion by using a vacuum pump to obtain a filter cake, washing the filter cake with purified water, repeating the washing for 4-6 times, then placing the filter cake in a vacuum drying oven at 80-100 ℃ for fully drying, grinding the filter cake into powder, and sieving the powder by using a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: slowly adding 3 parts of organic modified rectorite into 100 parts of organic silicon modified polyurethane emulsion, and stirring for 20min to obtain organic rectorite modified organic silicon polyurethane emulsion; and then 200 parts of portland slag cement, 1.5 parts of sulfonated acetone-formaldehyde condensate, 1.5 parts of glucose and 1 part of borax are added into the organic rectorite modified polyurethane emulsion, and the mixture is stirred at room temperature for 3-5 min to obtain the new and old pavement level splicing interface treatment material.
Embodiment 6. a new and old pavement base course splicing interface treatment material comprises, by weight, 75 parts of an organic silicon modified polyurethane emulsion, 2 parts of an organic modified rectorite, 150 parts of fly ash portland cement, 1 part of a water reducing agent, 1 part of citric acid and 1 part of calcium fluosilicate.
The organic silicon modified polyurethane emulsion comprises the following components in percentage by mass: 97 parts of polyoxypropylene ether dihydric alcohol, 3 parts of organic silicon, 90 parts of diphenylmethane diisocyanate, 4 parts of 1, 4-butanediol-2 sodium sulfonate, 5 parts of dimethylolpropionic acid, 7 parts of sodium hydroxide, 400 parts of water and 0.075 part of a polyurethane emulsion defoaming agent.
The organic modified rectorite comprises the following components in parts by weight:
30 parts of magnesium-based rectorite, 15 parts of hexadecyl trimethyl bromide and 400 parts of water.
The preparation method of the joint interface treatment material for the new and old road base course comprises the following steps:
s1, preparing organic silicon modified polyurethane emulsion: putting 97 parts of polyoxypropylene ether dihydric alcohol, 3 parts of organic silicon, 90 parts of diphenylmethane diisocyanate, 4 parts of 1, 4-butanediol-2 sodium sulfonate and 5 parts of dimethylolpropionic acid into a reaction kettle with the temperature set to 80 ℃, and reacting for 5 hours under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding 7 parts of sodium hydroxide, 400 parts of water and 0.075 part of polyurethane emulsion defoamer into the organic silicon modified polyurethane prepolymer for mixing reaction to obtain organic silicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding 39 parts of magnesium-based rectorite with the cation exchange capacity of 90mmol/100g into 700 parts of purified water, and stirring for 22min at the temperature of 80 ℃ to uniformly disperse the magnesium-based rectorite to obtain a homogeneous system of the magnesium-based rectorite and the water; adding 15 parts of hexadecyl trimethyl bromide into 15 parts of purified water, uniformly stirring, then adding into the homogeneous system of the rectorite and the water, and stirring for 3 hours at the temperature of 80 ℃ to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion by using a vacuum pump to obtain a filter cake, washing the filter cake by using purified water, repeating the washing for 4-6 times, then placing the filter cake in a vacuum drying oven at 90 ℃ for fully drying, grinding the filter cake into powder, and sieving the powder by using a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: slowly adding 2 parts of organic modified rectorite into 75 parts of organic silicon modified polyurethane emulsion, and stirring for 15-20 min to obtain organic rectorite modified organic silicon polyurethane emulsion; and adding 35 parts of water, 1 part of polycarboxylic acid water reducing agent, 1 part of citric acid and 1 part of calcium fluosilicate into the organic rectorite modified polyurethane emulsion, stirring for 1min, finally adding 150 parts of fly ash Portland cement, and continuously stirring for 5min to obtain the new and old pavement level splicing interface treatment material.
Embodiment 7. splicing interface treatment material for new and old pavement base layers and preparation method thereof
A new and old pavement base course splicing interface treatment material comprises the following components in parts by weight: 100 parts of organic silicon modified polyurethane emulsion, 3 parts of organic modified rectorite, 200 parts of slag portland cement, 1.5 parts of sulfonated acetone formaldehyde condensate, 1 part of glucose and 0.5 part of borax.
The organic silicon modified polyurethane emulsion comprises the following components in percentage by mass: 96 parts of tetrahydrofuran-propylene oxide ether copolymerized dihydric alcohol, 4 parts of organic silicon, 100 parts of toluene diisocyanate, 15 parts of dimethylolpropionic acid, 7 parts of dimethylethanolamine, 500 parts of water and 0.1 part of polyurethane emulsion defoaming agent.
The organic modified rectorite comprises the following components in parts by weight:
35 parts of calcium-based rectorite, 15 parts of hexadecyl trimethyl benzyl ammonium chloride and 700 parts of water.
The preparation method of the joint interface treatment material for the new and old road base course comprises the following steps:
s1, preparing organic silicon modified polyurethane emulsion: putting 96 parts of tetrahydrofuran-propylene oxide ether copolymerized dihydric alcohol, 4 parts of organic silicon, 100 parts of toluene diisocyanate and 15 parts of dimethylolpropionic acid into a reaction kettle with the temperature set to be 90 ℃, and reacting for 5 hours under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding 7 parts of dimethylethanolamine, 500 parts of water and 0.1 part of polyurethane emulsion special defoaming agent into the polyurethane prepolymer for mixing reaction to obtain organic silicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding 35 parts of calcium-based rectorite with the cation exchange capacity of 90mmol/100g into 650 parts of purified water, and stirring for 25min at 85 ℃ to uniformly disperse the calcium-based rectorite to obtain a homogeneous system of the calcium-based rectorite and the water; adding 5 parts of hexadecyl trimethyl ammonium chloride into 15 parts of purified water, uniformly stirring, then adding into the homogeneous system of the rectorite and the water, and stirring for 4 hours at 85 ℃ to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion by using a vacuum pump to obtain a filter cake, washing the filter cake with purified water, repeating the washing for 4-6 times, then placing the filter cake in a vacuum drying oven at 80-100 ℃ for fully drying, grinding the filter cake into powder, and sieving the powder by using a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: slowly adding 3 parts of organic modified rectorite into 100 parts of organic silicon modified polyurethane emulsion, and stirring for 20min to obtain organic rectorite modified organic silicon polyurethane emulsion; and then adding 45 parts of water, 1.5 parts of sulfonated acetone-formaldehyde condensate, 1.5 parts of glucose and 1 part of borax into the organic rectorite modified polyurethane emulsion, stirring for 1min, finally adding 200 parts of portland slag cement, and continuously stirring for 4min to obtain the new and old pavement base layer splicing interface treatment material.
The new and old pavement base layer splicing interface treatment material and the epoxy latex cement paste interface agent are tested for setting time, bonding performance (adhesive force drawing strength and composite drawing strength) and durability (freeze-thaw cycle compressive strength loss rate and freeze-thaw cycle quality loss rate) together. Preparing cement mortar from the new and old pavement base course splicing interface treatment material and the epoxy latex cement paste interface agent according to a cement-to-sand ratio of 1:2, measuring 28d compressive strength and flexural strength, and evaluating the mechanical properties of the two materials, wherein the results are as follows:
results of various performance tests
According to the performance test result, compared with the epoxy latex cement interface agent, the treatment material provided by the invention has the advantages that the setting time is prolonged, the construction requirement of extension engineering is met, the treatment material is more excellent in bonding performance and durability, the mechanical property, particularly the breaking strength, is better, and the industrial value is realized.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. The new and old pavement base course splicing interface treatment material is characterized by comprising 50-100 parts by weight of organic silicon modified polyurethane emulsion, 1-3 parts by weight of organic modified rectorite, 100-200 parts by weight of cement, 0.5-1.5 parts by weight of water reducing agent, 20-50 parts by weight of water and 0.5-2.5 parts by weight of composite retarder; the composite retarder is formed by compounding an organic retarder and an inorganic retarder, wherein the organic retarder is any one of calcium saccharate, glucose or citric acid, and the inorganic retarder is any one of phosphate, borax or calcium fluosilicate; the organic modified rectorite comprises, by weight, 25-35 parts of rectorite, 10-15 parts of an organic modifier and 500-700 parts of purified water; the rectorite is one or a mixture of more of sodium-based rectorite, calcium-based rectorite or magnesium-based rectorite; the organic modifier is one or a mixture of any two of octadecyl dimethyl benzyl ammonium chloride, hexadecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium chloride or gamma-propyl trimethoxy silane.
2. The material for treating the splicing interface of the new and old road surface base layers according to claim 1, wherein the organosilicon modified polyurethane emulsion comprises the following components in parts by weight: 90-100 parts of polyether polyol, 0-10 parts of organic silicon, 70-100 parts of isocyanate, 5-15 parts of hydrophilic chain extender, 3-7 parts of salt forming agent, 300-500 parts of water and 0.05-0.1 part of polyurethane emulsion defoaming agent, wherein the dosage of the organic silicon does not include 0 part.
3. The new-old pavement base course splicing interface treatment material as claimed in claim 2, wherein the polyether polyol is polyether polyol having an average functionality of not less than 3 and an average molecular weight of 8000.
4. The new and old pavement base course splicing interface treatment material as claimed in claim 2, wherein the organic silicon is one or a mixture of two of polymethylsiloxane and bis-hydroxy butyl polydimethylsiloxane.
5. The material for treating splicing interface of new and old road base layers according to claim 2, wherein the isocyanate is any one or a mixture of xylene methane diisocyanate or polymethylene polyphenyl polyisocyanate.
6. The new and old pavement base course splicing interface treatment material as recited in claim 2, wherein the hydrophilic chain extender is any one or a mixture of 1, 4-butanediol-2-sodium sulfonate or dimethylolpropionic acid.
7. The method for preparing the treatment material for the splicing interface of the new and old road base layers according to claim 1, which is characterized by comprising the following steps:
s1, preparing organic silicon modified polyurethane emulsion: firstly, putting polyether polyol, organic silicon, polyisocyanate, a coupling agent and a hydrophilic chain extender into a reaction kettle, and reacting under the protection of nitrogen to obtain an organic silicon modified polyurethane prepolymer; adding a salt forming agent, water and a polyurethane emulsion defoaming agent into the polyurethane prepolymer for mixing reaction to obtain an organic silicon modified polyurethane emulsion;
s2, preparing organic modified rectorite: adding rectorite with the cation exchange capacity of 90mmol/100g into water, and stirring to uniformly disperse the rectorite to obtain a homogeneous system of the rectorite and the water; adding an organic modifier into water, uniformly stirring, then adding the mixture into a homogeneous system of rectorite and water, and stirring to obtain an organic modified rectorite emulsion; carrying out suction filtration on the organic modified rectorite emulsion to obtain a filter cake, washing the filter cake with water, then drying the filter cake, grinding the filter cake into powder, and sieving the powder through a 200-300-mesh sieve to obtain the organic modified rectorite;
s3, preparing a new and old pavement base course splicing interface treatment material: adding organic modified rectorite into the organic silicon modified polyurethane emulsion, and stirring to obtain organic rectorite organic silicon polyurethane emulsion; and mixing and stirring the organic rectorite modified organic silicon polyurethane emulsion, water, a water reducing agent and a composite retarder uniformly, and finally adding cement and continuing stirring to obtain the new and old pavement base layer splicing interface treatment material.
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| CN112624699B (en) * | 2020-12-23 | 2022-08-09 | 山东省交通科学研究院 | Cold-state splicing adhesive for new and old water-stabilized base layer of road |
| CN115287034B (en) * | 2022-09-29 | 2022-12-09 | 铁科腾跃科技有限公司 | Interfacial agent-free polyurethane elastomer for railway concrete expansion joints and preparation method thereof |
| CN118125777B (en) * | 2024-03-27 | 2024-08-06 | 嘉兴市中联混凝土股份有限公司 | High-performance concrete with high compressive strength and good compactness and preparation method thereof |
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