CN113105198A - Plate bottom grouting material for assembled cement concrete pavement plate - Google Patents
Plate bottom grouting material for assembled cement concrete pavement plate Download PDFInfo
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- CN113105198A CN113105198A CN202110409266.1A CN202110409266A CN113105198A CN 113105198 A CN113105198 A CN 113105198A CN 202110409266 A CN202110409266 A CN 202110409266A CN 113105198 A CN113105198 A CN 113105198A
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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
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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 the technical field of engineering materials, in particular to a plate bottom grouting material for an assembled cement concrete pavement plate. The invention uses a complex system of ordinary portland cement doped with quick-hardening sulphoaluminate cement as a main cementing material, and adds reinforcing fiber, mineral admixture and various additive materials to realize the high fluidity, quick-hardening, early strength and high strength of the grouting material.
Description
Technical Field
The invention relates to the technical field of engineering materials, in particular to a plate bottom grouting material for an assembled cement concrete pavement plate.
Background
The assembled pavement technology is a pavement rapid construction technology, and has the following meanings: the original pavement is broken, the prefabricated pavement boards in a factory are transported to the site for rapid assembly, and the traffic can be opened after the completion. The technology can be applied to quick construction and quick maintenance of road engineering, airport runway engineering and port pavement engineering. However, due to the complex pavement structure and the inaccurate control of the dimensions of the fabricated cement concrete pavement slab during the fabrication process, the dimensions of the fabricated pavement slab and the dimensions of the pavement break cannot be completely matched, and the adhesion between the pavement slab and the ground break is an important technical problem to be overcome in the practical application of the fabricated pavement technology.
The grouting technology is an effective technical means for solving the technical problems, and after the shop front boards prefabricated by a factory are paved at the original pavement breaking positions, grouting materials with the properties of self-flowing, quick hardening, early strength, high strength and the like are injected between the shop front boards and the broken ground through the grouting technology to play the roles of effectively bonding and filling gaps, so that the shop front boards and the original pavement materials can be well bonded, and the technical purposes of quick assembly and high-quality pavement construction are realized. However, in the prior art, although the grouting material is available on the market in various types, the technical problems of high fluidity, rapid hardening, early strength, high strength and the like which cannot be obtained simultaneously still exist in practical use.
Disclosure of Invention
In order to solve the technical problems, the invention provides a plate bottom grouting material for an assembled cement concrete pavement plate, which has the performances of quick hardening, early strength and high strength while ensuring the high fluidity of the grouting material, thereby meeting the use requirements of the assembled pavement technology.
According to one technical scheme, the slab bottom grouting material for the assembled cement concrete pavement slab comprises the following raw materials in parts by weight:
100-150 parts of silicate cement, 30-60 parts of sulphoaluminate cement, 10-50 parts of mineral admixture, 1-5 parts of reinforcing fiber, 5-10 parts of redispersible latex powder, 1-2 parts of expanding agent, 2-5 parts of water reducing agent and 1-2 parts of defoaming agent.
Further, the portland cement is 42.5 portland cement, the sulphoaluminate cement is 42.5 quick-hardening sulphoaluminate cement, the reinforcing fiber is polyvinyl alcohol fiber with the length of 3-6mm, the expanding agent is UEA type expanding agent, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the defoaming agent is an organic silicon defoaming agent.
Further, the mixing mass ratio of the portland cement to the sulphoaluminate cement is 3:1, and the mineral admixture is a mixture of fly ash, slag powder and silica fume with the mass ratio of 1:1: 1.
The present invention also provides a method for preparing the plate bottom grouting material for the fabricated cement concrete pavement plate, comprising the steps of: and (2) uniformly mixing the redispersible latex powder and the reinforcing fiber, adding water according to the water-cement ratio of 0.25-0.4, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly mixing, adding the uniformly premixed mixture of the silicate cement, the sulphoaluminate cement and the mineral admixture, and uniformly mixing to obtain the plate bottom grouting material for the assembled cement concrete pavement plate.
Further, the bottom grouting material for the fabricated cement concrete pavement slab also comprises 10-30 parts of raw material water-based polyurethane polyol, 0.2-1 part of catalyst and 5-10 parts of isocyanate curing agent.
Further, the catalyst is one or more of triethylamine, N-dimethylformamide and dimethylbenzylamine, and the isocyanate curing agent is diphenylmethane diisocyanate and/or polymethylene polyphenyl polyisocyanate.
The preparation method of the plate bottom grouting material for the fabricated cement concrete pavement plate comprises the following steps:
(1) uniformly mixing the redispersible latex powder and the reinforcing fiber, adding water according to the water-cement ratio of 0.25-0.4, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly stirring, adding the uniformly premixed mixture of the portland cement, the sulphoaluminate cement and the mineral admixture, and uniformly stirring to obtain mixed slurry A;
(2) and (3) sequentially adding the water-based polyurethane polyol, the isocyanate curing agent and the catalyst into the mixed slurry A under the stirring condition, and uniformly mixing to obtain the plate bottom grouting material for the fabricated cement concrete pavement plate.
The invention also provides the application of the plate bottom grouting material for the fabricated cement concrete pavement plate in fabricated pavement construction.
Compared with the prior art, the invention has the following beneficial effects:
the invention uses a complex system of ordinary portland cement doped with quick-hardening sulphoaluminate cement as a main cementing material, and adds reinforcing fiber, mineral admixture and various additive materials to realize the high fluidity, quick-hardening, early strength and high strength of the grouting material; experiments prove that the initial fluidity of the plate bottom grouting material for the assembled cement concrete pavement plate can reach 9s, the initial setting time is 42-52min, the final setting time is 85-96min, the highest compressive strength of the plate bottom grouting material can reach 42MPa after 1-day curing, the highest compressive strength of the plate bottom grouting material can reach 45MPa after 3-day normal-temperature curing, the highest compressive strength of the plate bottom grouting material can reach 7 days after normal-temperature curing, the highest compressive strength of the plate bottom grouting material can reach 69MPa, the highest compressive strength of the plate bottom grouting material can reach 75MPa after 28-day.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
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. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
As the technical scheme of the invention, the plate bottom grouting material for the assembled cement concrete pavement plate comprises the following raw materials in parts by weight:
100-150 parts of silicate cement, 30-60 parts of sulphoaluminate cement, 10-50 parts of mineral admixture, 1-5 parts of reinforcing fiber, 5-10 parts of redispersible latex powder, 1-2 parts of expanding agent, 2-5 parts of water reducing agent and 1-2 parts of defoaming agent.
In the prior art, the cement-based grouting material with sulphoaluminate cement as a main cementing material can ensure that the cement-based grouting material has higher early strength, but has the defects of short setting time, poor fluidity and high manufacturing cost; the cement-based grouting material using ordinary portland cement as a main cementing material has lower manufacturing cost than sulphoaluminate cement, but has the defects of slow setting time, large hydration heat release, low early strength, later hardening shrinkage and the like. The silicate cement and the sulphoaluminate cement are mutually matched, so that the advantages can be complemented, and the effects of early strength and quick setting can be realized on the premise of ensuring the fluidity;
the antifreezing durability, the fluidity, the volume stability, the erosion resistance, the strength and the like can be improved by adding a proper amount of mineral admixture;
the addition of the reinforcing fibers can further improve the strength of the grouting material, improve the bonding strength between the grouting material and the pavement breaking position, and meanwhile, the fibers with certain length can improve the stress distribution in the material and reduce the hardening shrinkage rate of the ordinary portland cement;
the redispersible latex powder can be quickly redispersed into emulsion after contacting with water, has high bonding capability and unique performance, and can improve the bonding strength between the grouting material and pavement breaking positions;
the expanding agent is mainly used for compensating the shrinkage of the material in the hardening process and preventing cracking, and the proper expansion performance is the premise of ensuring good bonding between the grouting material and the matrix;
the water reducing agent is a concrete admixture which can reduce the water consumption for mixing under the condition of keeping the slump constant of concrete basically;
the defoaming agent can eliminate bubbles generated in the water reducing agent and the stirring process, and the quality of the grouting material is ensured.
In a further preferred embodiment of the present invention, the portland cement is 42.5 portland cement, the sulphoaluminate cement is 42.5 quick-hardening sulphoaluminate cement, the reinforcing fiber is polyvinyl alcohol fiber with a length of 3-6mm, the expanding agent is UEA type expanding agent, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the defoaming agent is an organic silicon defoaming agent.
The reinforcing fiber is polyvinyl alcohol fiber with the length of 3-6mm, which can not only ensure that the fluidity of the material is not influenced, but also can realize the purpose of reinforcing the strength of the material.
As a further preferable technical scheme of the invention, the mixing mass ratio of the portland cement and the sulphoaluminate cement is 3:1, and the mineral admixture is a mixture of fly ash, slag powder and silica fume with the mass ratio of 1:1: 1.
The slag powder and the silica fume can fill the pores among the cement particles and simultaneously generate gel with hydration products, so that the workability and the early strength of the grouting material are improved, the hydration heat of common portland cement is reduced, the durability of the material can be greatly improved, particularly the chloride invasion resistance is improved, and the structural compactness is also enhanced; fly ash particles are generally small, glassThe integral aggregation degree of the particles is smaller, and more single glass microspheres are arranged, so that the addition of the fly ash can effectively improve the lubricating effect of the grouting material and the effect of the balls of the grouting material, the lubricating property of the particle surface is stronger, and the fluidity of the material is improved. However, the too large doping amount of the fly ash can cause a delay effect on the setting time, so that the slurry needs longer setting time, thereby influencing the early strength and the rapid hardening performance of the material; meanwhile, because the CaO content in the chemical components of the slag powder is higher, SiO in the silica fume2The content is high, the potential activity is excellent, and the two are used after being compounded and mixed with the fly ash, so that the complementary advantages can be realized, and the integral effect of the fly ash is improved; experiments prove that the mixture of the fly ash, the slag powder and the silica fume with the mass ratio of 1:1:1 can ensure the strength and the durability of the material to the maximum extent on the premise of ensuring the fluidity, so as to achieve the best technical effect.
The present invention also provides a method for preparing the plate bottom grouting material for the fabricated cement concrete pavement plate, comprising the steps of: and (2) uniformly mixing the redispersible latex powder and the reinforcing fiber, adding water according to the water-cement ratio of 0.25-0.4, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly mixing, adding the uniformly premixed mixture of the silicate cement, the sulphoaluminate cement and the mineral admixture, and uniformly mixing to obtain the plate bottom grouting material for the assembled cement concrete pavement plate.
The reinforcing fiber and the redispersible latex powder are firstly mixed uniformly and then mixed with other additives, and the redispersible latex powder can be quickly redispersed into emulsion after contacting with water and has high bonding capability, so that the surface of the reinforcing fiber can be promoted to adhere a layer of latex powder component, and the reinforcing performance of the fiber on the grouting material is improved, so that when the addition amount of the fiber is less, the reinforcing fiber still has a remarkable item-adding effect on the grouting material, and the technical problems that the addition amount is too small and the reinforcing performance is not remarkable are solved, and the influence of too much addition amount of the fiber on the fluidity of the grouting material is avoided.
As a further preferable technical scheme of the invention, the plate bottom grouting material for the fabricated cement concrete pavement plate also comprises 10-30 parts of raw material waterborne polyurethane polyol, 0.2-1 part of catalyst and 5-10 parts of isocyanate curing agent.
The cement grouting material is compounded with the polyurethane polyol and the isocyanate curing agent, the hydroxyl component and NCO are subjected to a crosslinking reaction in the grouting process, the reaction product increases the binding power and toughness of the grouting material, the defect of overlarge rigidity of the cement-based material is overcome, and the anti-cracking effect can be effectively achieved.
As a further preferable technical scheme of the invention, the catalyst is one or more of triethylamine, N-dimethylformamide and dimethylbenzylamine, and the isocyanate curing agent is diphenylmethane diisocyanate and/or polymethylene polyphenyl polyisocyanate.
The preparation method of the plate bottom grouting material for the fabricated cement concrete pavement plate comprises the following steps:
(1) uniformly mixing the redispersible latex powder and the reinforcing fiber, adding water according to the water-cement ratio of 0.25-0.4, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly stirring, adding the uniformly premixed mixture of the portland cement, the sulphoaluminate cement and the mineral admixture, and uniformly stirring to obtain mixed slurry A;
(2) and (3) sequentially adding the water-based polyurethane polyol, the isocyanate curing agent and the catalyst into the mixed slurry A under the stirring condition, and uniformly mixing to obtain the plate bottom grouting material for the fabricated cement concrete pavement plate.
As a further preferable technical scheme of the invention, 5-10 parts of graphene oxide is also added into the plate bottom grouting material for the fabricated cement concrete pavement plate.
The preparation method comprises the following steps:
(1) dissolving graphene oxide in water, and performing ultrasonic dispersion to obtain a graphene oxide dispersion liquid;
(2) uniformly mixing re-dispersible latex powder and reinforcing fibers, adding the graphene oxide dispersion liquid prepared in the step (1) until the water-cement ratio is 0.25-0.4, adding an expanding agent, a water reducing agent and a defoaming agent, uniformly stirring, adding a uniformly premixed mixture of silicate cement, sulphoaluminate cement and a mineral admixture, and uniformly stirring to obtain mixed slurry A;
(3) and (3) sequentially adding the water-based polyurethane polyol, the isocyanate curing agent and the catalyst into the mixed slurry A under the stirring condition, and uniformly mixing to obtain the plate bottom grouting material for the fabricated cement concrete pavement plate.
The graphene oxide has excellent dispersibility in water, and can promote the reinforcing fibers to be uniformly dispersed in the redispersible latex; meanwhile, in a grouting system, the graphene oxide can have interfaces as a surfactant and reduce the energy between the interfaces, so that the grouting material enters the parts which cannot be used for grouting common grouting materials, the fine microstructure of the grouting material is improved, the performance of the grouting material is improved from the micro scale, the grouting material has ultrahigh flow characteristic, and the working performance of the grouting material cannot be greatly influenced.
In the following examples of the present invention, the portland cement used is 42.5 portland cement, the sulphoaluminate cement is 42.5 quick-hardening sulphoaluminate cement, the reinforcing fiber is polyvinyl alcohol fiber with a length of 3-6mm, the expanding agent is UEA type expanding agent, the water reducing agent is a polycarboxylic acid high performance water reducing agent, and the defoaming agent is an organic silicon defoaming agent.
Example 1
(1) Weighing the following raw materials in parts by weight: 150 parts of portland cement, 50 parts of sulphoaluminate cement, 30 parts of mineral admixture (a mixture of fly ash, slag powder and silica fume in a mass ratio of 1:1: 1), 3 parts of reinforcing fiber, 10 parts of redispersible latex powder (acrylic copolymer), 1 part of expanding agent, 2 parts of water reducing agent and 1 part of defoaming agent;
(2) the mixture of the portland cement, the sulphoaluminate cement and the mineral admixture is premixed evenly for standby;
(3) and (3) uniformly mixing the redispersible latex powder and the reinforcing fiber, adding water according to the water-cement ratio of 0.3, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly stirring, adding the premixed mixture of the silicate cement, the sulphoaluminate cement and the mineral admixture, and uniformly stirring to obtain the plate bottom grouting material for the assembled cement concrete pavement plate.
(4) Performance testing (results in table 1):
fluidity: testing the fluidity of the prepared grouting material according to the national standard (GB/T2419 cement mortar fluidity testing method);
setting time: the prepared grouting material is subjected to a setting time test according to the national standard (GB/T2011 cement standard consistency water consumption, setting time and stability test method);
and (3) testing the strength: testing the strength of the prepared grouting material according to the national standard (GB/T50448-;
example 2
The difference from example 1 is that the mixing mass ratio of portland cement to sulphoaluminate cement is 2:1, i.e. 150 parts of portland cement and 75 parts of sulphoaluminate water.
Example 3
The difference from example 1 is that the mineral admixture is fly ash.
Comparative example 1
The difference from example 1 is that the reinforcing fibers are omitted.
Comparative example 2
The difference from example 1 is that the redispersible latex powder is omitted.
Example 4
The difference from example 1 is that the raw material further includes 8 parts of graphene oxide.
The preparation method comprises the following steps:
(1) dissolving graphene oxide in water, and performing ultrasonic dispersion to obtain a graphene oxide dispersion liquid;
(2) the mixture of the portland cement, the sulphoaluminate cement and the mineral admixture is premixed evenly for standby;
(3) uniformly mixing the redispersible latex powder and the reinforcing fiber, adding the graphene oxide dispersion according to the water-cement ratio of 0.3, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly stirring, adding the premixed mixture of the portland cement, the sulphoaluminate cement and the mineral admixture, and uniformly stirring to obtain the plate bottom grouting material for the assembled cement concrete pavement plate;
(4) the performance was measured as in example 1 and the results are shown in Table 1.
Example 5
(1) Weighing the following raw materials in parts by weight: 150 parts of portland cement, 50 parts of sulphoaluminate cement, 30 parts of mineral admixture (a mixture of fly ash, slag powder and silica fume in a mass ratio of 1:1: 1), 3 parts of reinforcing fiber, 10 parts of redispersible latex powder, 1 part of expanding agent, 2 parts of water reducing agent, 1 part of defoaming agent, 25 parts of polycaprolactone polyol, 0.8 part of triethylamine and 5 parts of diphenylmethane diisocyanate;
(2) the mixture of the portland cement, the sulphoaluminate cement and the mineral admixture is premixed evenly for standby; uniformly mixing the redispersible latex powder and the reinforcing fiber, adding water according to the water-cement ratio of 0.3, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly stirring, adding the uniformly premixed mixture of the portland cement, the sulphoaluminate cement and the mineral admixture, and uniformly stirring to obtain mixed slurry A;
(3) and (3) sequentially adding polycaprolactone polyol, diphenylmethane diisocyanate and triethylamine into the mixed slurry A under the stirring condition, and uniformly mixing to obtain the plate bottom grouting material for the fabricated cement concrete pavement plate.
(4) The performance was measured as in example 1 and the results are shown in Table 1.
Example 6
(1) Weighing the following raw materials in parts by weight: 150 parts of portland cement, 50 parts of sulphoaluminate cement, 30 parts of mineral admixture (a mixture of fly ash, slag powder and silica fume in a mass ratio of 1:1: 1), 3 parts of reinforcing fiber, 10 parts of redispersible latex powder, 1 part of expanding agent, 2 parts of water reducing agent, 1 part of defoaming agent, 25 parts of polycaprolactone polyol, 0.8 part of triethylamine, 5 parts of diphenylmethane diisocyanate and 8 parts of graphene oxide;
(2) dissolving graphene oxide in water, and performing ultrasonic dispersion to obtain a graphene oxide dispersion liquid; the mixture of the portland cement, the sulphoaluminate cement and the mineral admixture is premixed evenly for standby; uniformly mixing redispersible latex powder and reinforcing fiber, adding graphene oxide dispersion according to the water-cement ratio of 0.3, adding an expanding agent, a water reducing agent and a defoaming agent, uniformly stirring, adding a uniformly premixed mixture of portland cement, sulphoaluminate cement and a mineral admixture, and uniformly stirring to obtain mixed slurry A;
(3) and (3) sequentially adding polycaprolactone polyol, diphenylmethane diisocyanate and triethylamine into the mixed slurry A under the stirring condition, and uniformly mixing to obtain the plate bottom grouting material for the fabricated cement concrete pavement plate.
(4) The performance was measured as in example 1 and the results are shown in Table 1.
TABLE 1
Note: in Table 1, the curing conditions were 23-25 ℃ and the humidity was 45-50%.
The data in table 1 show that when the cellulose is omitted, the fluidity of the grouting material can be improved, but the corresponding strength performance is also obviously reduced, and the strength of the material is also reduced to a certain extent when the redispersible latex powder is omitted, and the strength of the material is obviously improved by adding the graphene oxide, the polycaprolactone polyol, the triethylamine and the diphenylmethane diisocyanate on the premise of ensuring the fluidity of the material.
In further experimental verification, the prepared grouting material can realize higher performances of fluidity and strength in the range of 100-150 parts of portland cement, 30-60 parts of sulphoaluminate cement, 10-50 parts of mineral admixture, 1-5 parts of reinforcing fiber, 5-10 parts of redispersible latex powder, 1-2 parts of expanding agent, 2-5 parts of water reducing agent, 1-2 parts of defoaming agent, 10-30 parts of waterborne polyurethane polyol, 0.2-1 part of catalyst, 5-10 parts of isocyanate curing agent and 5-10 parts of graphene oxide.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The bottom grouting material for the assembled cement concrete pavement slab is characterized by comprising the following components in parts by mass:
100-150 parts of silicate cement, 30-60 parts of sulphoaluminate cement, 10-50 parts of mineral admixture, 1-5 parts of reinforcing fiber, 5-10 parts of redispersible latex powder, 1-2 parts of expanding agent, 2-5 parts of water reducing agent and 1-2 parts of defoaming agent.
2. The grouting material for a slab of an assembled cement concrete pavement slab according to claim 1, wherein the portland cement is 42.5 portland cement, the sulphoaluminate cement is 42.5 quick-hardening sulphoaluminate cement, the reinforcing fiber is polyvinyl alcohol fiber with a length of 3-6mm, the expanding agent is UEA type expanding agent, the water reducing agent is a polycarboxylic acid high performance water reducing agent, and the defoaming agent is an organosilicon defoaming agent.
3. The plate bottom grouting material for an assembled cement concrete pavement plate according to claim 1, wherein the mixing mass ratio of the portland cement and the sulphoaluminate cement is 3:1, and the mineral admixture is a mixture of fly ash, slag powder and silica fume in a mass ratio of 1:1: 1.
4. The plate bottom grouting material for an assembled cement concrete pavement plate according to claim 1, further comprising 10-30 parts of raw material aqueous polyurethane polyol, 0.2-1 part of catalyst, and 5-10 parts of isocyanate curing agent.
5. The plate bottom grouting material for fabricated cement concrete pavement plates according to claim 4, wherein the catalyst is one or more of triethylamine, N-dimethylformamide and dimethylbenzylamine, and the isocyanate curing agent is diphenylmethane diisocyanate and/or polymethylene polyphenyl polyisocyanate.
6. A method of preparing a plate bottom grouting material for an assembled cement concrete pavement plate according to any one of claims 1 to 3, comprising the steps of: and (2) uniformly mixing the redispersible latex powder and the reinforcing fiber, adding water according to the water-cement ratio of 0.25-0.4, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly mixing, adding the uniformly premixed mixture of the silicate cement, the sulphoaluminate cement and the mineral admixture, and uniformly mixing to obtain the plate bottom grouting material for the assembled cement concrete pavement plate.
7. A method of preparing a grout for fabricated cement concrete decking panels according to claims 4 to 5, comprising the steps of:
(1) uniformly mixing the redispersible latex powder and the reinforcing fiber, adding water according to the water-cement ratio of 0.25-0.4, adding the expanding agent, the water reducing agent and the defoaming agent, uniformly stirring, adding the uniformly premixed silicate cement, sulphoaluminate cement and mineral admixture, and uniformly stirring to obtain mixed slurry A;
(2) and (3) sequentially adding the water-based polyurethane polyol, the isocyanate curing agent and the catalyst into the mixed slurry A under the stirring condition, and uniformly mixing to obtain the plate bottom grouting material for the fabricated cement concrete pavement plate.
8. Use of a grout material for fabricated cementitious concrete decking panels as claimed in any one of claims 1 to 5 in fabricated decking construction.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115124300A (en) * | 2022-05-20 | 2022-09-30 | 中铁上海工程局集团市政环保工程有限公司 | Special waterborne polyurethane grouting material for trenchless spiral winding repairing technology and preparation method thereof |
| CN115180905A (en) * | 2022-07-01 | 2022-10-14 | 中德新亚建筑材料有限公司 | Ultrahigh-strength non-shrinkage grouting material and preparation method thereof |
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| CN115180905A (en) * | 2022-07-01 | 2022-10-14 | 中德新亚建筑材料有限公司 | Ultrahigh-strength non-shrinkage grouting material and preparation method thereof |
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