CN113185242B - Ultrahigh-strength grouting material for connecting assembled bridge reinforcement sleeve and preparation method thereof - Google Patents
Ultrahigh-strength grouting material for connecting assembled bridge reinforcement sleeve and preparation method thereof Download PDFInfo
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- CN113185242B CN113185242B CN202110396271.3A CN202110396271A CN113185242B CN 113185242 B CN113185242 B CN 113185242B CN 202110396271 A CN202110396271 A CN 202110396271A CN 113185242 B CN113185242 B CN 113185242B
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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
- 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
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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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
- C04B28/34—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
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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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses an ultrahigh-strength grouting material for connecting an assembled bridge reinforcing steel bar sleeve and a preparation method thereof, wherein the grouting material comprises 30-50wt% of raw material ordinary cement, 1-15wt% of special cement, 35-50wt% of aggregate, 5-20wt% of pretreated high-activity mineral admixture, 1-7wt% of composite expanding agent and 0.1-5wt% of additive; the pretreated high-activity mineral admixture is prepared by mixing and stirring 10-35wt% of superfine microspheres, 5-20wt% of metakaolin and 60-85wt% of superfine slag micro powder for 6-10min, and sieving undersize materials through a 0.315mm square hole sieve. The ultra-high strength grouting material provided by the invention adopts the pretreated high-activity mineral admixture prepared from special raw materials, the reinforcement bond property, the mechanical property and the fluidity of the ultra-high strength grouting material are obviously improved, and the low-grade metal slag is used as the aggregate, so that the problems of low activity and difficult utilization of low-grade metallurgical slag are solved.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to grouting material for connecting a reinforcing steel bar sleeve of an assembled bridge.
Background
In recent years, a new round of prefabricated building development has risen around the country. At present, the domestic assembly type building has completed the transition from a pilot demonstration stage to a comprehensive popularization stage, presents a good development trend, and gradually drives the building industry to develop a way of quality improvement, efficiency enhancement and green development.
The market prospect of the fabricated building is good, but the related sleeve grouting material product market has the phenomena of various product types and uneven quality, and although the product quality of some manufacturers also reaches or approaches the international advanced level, the overall level of the domestic grouting material has a certain difference with foreign countries, which is mainly reflected in that the flowability of fresh grouting material is poor, the later strength is difficult to break through 130MPa, the bonding performance with a steel bar sleeve is poor, the early plastic expansion is avoided, and the like.
JGJ 355-2015 technical Specification for grouting and connecting reinforcing steel sleeves 3.1.1 indicates that the diameter of the reinforcing steel bars connected by sleeve grouting is not smaller than 12mm and not larger than 40mm. This limits the use of large-sized reinforcing bars in the fabricated field, particularly in the fabricated bridge field. The ultrahigh-strength grouting material for the reinforcement sleeve connection of the assembled bridge is developed, the bond strength of a reinforcement sleeve grouting connection test piece is improved, and the large-size reinforcement sleeve grouting connection test piece meets the joint type inspection requirement in JGJ 355, so that the technical bottleneck is broken through more importantly. On the other hand, the bridge contacts deicing salt in winter, so that the risk of steel bar corrosion is increased, and the rust-resisting component is introduced into the ultrahigh-strength grouting material for the reinforcement sleeve connection of the assembled bridge, so that a good rust-resisting effect can be achieved, and the service life of the assembled bridge is better guaranteed.
In the prior art, chinese patent application CN110540401A provides a sleeve grouting material for high-temperature steel bar connection, which is prepared from cementing materials, aggregates, stabilizers, organic film coating agents, temperature regulators and functional additives. For another example, chinese patent application CN111056807A provides a glass sand grouting material, which comprises cement, superfine silica fume, fly ash, glass powder, graded glass sand, high performance water reducing agent, plastic expanding agent, middle and later expanding agent, defoaming agent, early strength agent, water retention agent, rust inhibitor and water. For another example, the rapid hardening sleeve grouting material for steel bar connection provided by chinese granted patent CN107935517B comprises raw materials of sulphoaluminate cement, silica fume, sand, composite expanding agent a, composite expanding agent B, water reducing agent, defoaming agent, stabilizing agent, composite set adjusting agent a and composite set adjusting agent B; the composite setting regulator A comprises sodium tetraborate and sodium gluconate, the composite setting regulator B comprises calcium formate and lithium carbonate, the composite expanding agent A comprises sodium dodecyl benzene sulfonate and triterpenoid saponin, and the composite expanding agent B comprises ettringite and calcium oxide. However, the bond performance, the super early strength and the super high strength of the reinforcing steel bar sleeve grouting material prepared by the method still have rising space.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an ultrahigh-strength grouting material for connecting an assembled bridge reinforcing steel bar sleeve and a preparation method thereof, and the ultrahigh-strength grouting material is realized by the following technology.
The ultrahigh-strength grouting material for the connection of the assembled bridge reinforcing steel bar sleeve comprises the following raw materials: 30-50wt% of ordinary cement, 1-15wt% of special cement, 35-50wt% of aggregate, 5-20wt% of pretreated high-activity mineral admixture, 1-7wt% of composite expanding agent and 0.1-5wt% of additive;
the preparation method of the pretreated high-activity mineral admixture comprises the following steps: mixing 10-35wt% of superfine microsphere, 5-20wt% of metakaolin and 60-85wt% of superfine slag micropowder, stirring for 6-10min, and sieving with 0.315mm square hole sieve.
The ultrahigh-strength grouting material is added with the pretreated high-activity mineral admixture prepared from special raw materials, so that the reinforcement bond property of the ultrahigh-strength grouting material is remarkably improved, and compared with a common sleeve grouting material sold in the market and executing the standard JG/T408-2013 sleeve grouting material for reinforcement connection, the reinforcement bond property is improved by over 50%. Meanwhile, due to the addition of the pretreated high-activity mineral admixture, a more compact filling effect and a volcanic ash effect are generated among other raw materials of the grouting material, and cement-stone interface defects are reduced, so that the finally prepared ultrahigh-strength grouting material has excellent mechanical properties, wherein the 1d compressive strength is more than or equal to 50MPa, the 3d compressive strength is more than or equal to 90MPa, and the 28d compressive strength is more than or equal to 130MPa.
Preferably, the raw materials of the ultrahigh-strength grouting material comprise 40wt% of ordinary cement, 6wt% of special cement, 40wt% of aggregate, 10wt% of a pretreated high-activity mineral admixture, 2wt% of a composite expanding agent and 2wt% of an additive.
Preferably, the raw materials of the pretreated high-activity mineral admixture comprise 20wt% of ultrafine micro-beads, 10wt% of metakaolin and 70wt% of ultrafine slag micro-powder.
More preferably, the superfine microbeads are standard spherical particles, the particle size d10 is less than or equal to 0.5 mu m, d50 is less than or equal to 3 mu m, d95 is less than or equal to 10 mu m, and the activity index 7d is more than 80 percent28d > 110%; the metakaolin is prepared by calcining and dehydrating kaolin; the superfine slag micropowder is prepared by drying and grinding blast furnace slag and has the specific surface area of more than or equal to 800m 2 /kg。
Preferably, the ordinary cement is portland cement and/or ordinary portland cement with the strength grade d being more than or equal to 42.5, and the special cement is at least one of sulphoaluminate cement, magnesium phosphate cement and high-alumina cement; the aggregate is composed of continuous graded quartz sand and/or low-grade steel slag. The low-grade steel slag aggregate is metallurgical waste slag which is generated in steel smelting and takes oxides of silicon and aluminum as main components, has the autoclave stability of less than 0.8 percent and has the particle size of less than 2 mm.
More preferably, the aggregate is composed of the continuously graded quartz sand and low-grade steel slag, and the low-grade steel slag accounts for 0-50% of the total mass of the aggregate. When the low-grade steel slag accounts for 25 percent of the total mass of the aggregate, the effect is optimal.
Preferably, the composite expanding agent comprises 0.4-5wt% of plastic expanding agent, 50-80wt% of calcium oxide-calcium sulphoaluminate expanding agent and 15-48wt% of magnesium oxide expanding agent. The plastic expanding agent is at least one of azo compounds, animal protein foaming agents and sulfonyl hydrazide compounds. The calcium oxide-calcium sulphoaluminate expanding agent adopts a double-expansion-source expanding agent, and the limited expansion rate of the expanding agent meets the requirement of a II-type expanding agent in GB/T23439; the magnesium oxide type expanding agent has an activity index exceeding 140s.
Preferably, the admixture comprises 30-70wt% of water reducing agent, 10-30wt% of rust inhibitor, 5-15wt% of defoaming agent, 3-15wt% of water retaining agent and 3-15wt% of pour adjusting agent.
More preferably, the water reducing agent is a polycarboxylic acid water reducing agent, the rust inhibitor comprises at least one of phosphate, molybdate and fluosilicate, the defoamer is an organic silicon defoamer, and the water retaining agent is cellulose ether and/or biogel; the coagulation regulator is at least one of boric acid, sodium gluconate, tartaric acid, tartrate, citric acid, citrate and metaphosphate.
The invention also provides a preparation method of the ultrahigh-strength grouting material for connecting the assembled bridge reinforcing steel bar sleeve, which is characterized in that the composite expanding agent and the additive are stirred and premixed with part (generally not less than 5 kg) of the common cement to prepare a premixed sample; and mixing and stirring the special cement, the aggregate, the pretreated high-activity mineral admixture and the rest (namely after 5kg of admixture is deducted) of the ordinary cement uniformly, adding the premixed sample, and stirring uniformly to obtain the finished product of the ultrahigh-strength grouting material.
Compared with the prior art, the invention has the advantages that:
1. the ultrahigh-strength grouting material provided by the invention adopts the pretreated high-activity mineral admixture prepared from special raw materials, so that the reinforcement bond property of the ultrahigh-strength grouting material is remarkably improved, and compared with a common sleeve grouting material sold in the market and executing the standard JG/T408-2013 sleeve grouting material for reinforcement connection, the reinforcement bond property is improved by more than 65%;
2. the pretreated high-activity mineral admixture also has a synergistic promotion effect with other raw materials of the grouting material, so that a more compact filling effect and a volcanic ash effect are generated among the raw materials, and cement interface defects are reduced, so that the finally prepared ultrahigh-strength grouting material has excellent mechanical properties, wherein the 1d compressive strength is more than or equal to 50MPa, the 3d compressive strength is more than or equal to 90MPa, and the 28d compressive strength is more than or equal to 130MPa;
3. the invention adopts the high-performance water reducing agent and the high-activity mineral admixture which respectively have high water reducing rate and ball effect, can still ensure good construction performance when the water-material ratio is 0.11-0.13, and the initial fluidity is 320-345mm, the fluidity of 30min is still kept 300-320 mm;
4. the ultrahigh-strength grouting material provided by the invention uses low-grade metal slag as aggregate, and solves the problems of low activity and difficult utilization of low-grade metallurgical slag.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The ordinary cement used in the following examples and comparative examples is ordinary portland cement with a strength grade of 52.5, and the special cement is sulphoaluminate cement with a strength grade of 42.5; the grain size range of the adopted continuous graded quartz sand is 0-2.36mm, wherein the mass ratio of the quartz sand with each grain size is 1.18-2.36mm to 12.09%,0.63-1.18mm to 36.45%,0.315-0.63mm to 27.71%,0.15-0.315mm to 20.28%, and less than 0.15mm to 3.47%, which accounts for 100%. (ii) a The adopted low-grade steel slag is metallurgical slag which takes oxides of silicon and aluminum as main components and is generated during steel smelting, the autoclave stability is less than 0.8 percent, and the particle size is less than 2 mm; the adopted calcium oxide-calcium sulphoaluminate expanding agent adopts a double-expansion-source expanding agent, the limited expansion rate of the expanding agent meets the requirement of a II-type expanding agent in GB/T23439, and the activity index of the magnesium oxide expanding agent exceeds 140s.
The admixture consists of 60wt% of water reducing agent, 12wt% of rust inhibitor, 10wt% of defoaming agent, 7wt% of water retaining agent and 11wt% of coagulation regulator; the water reducing agent is a polycarboxylic acid water reducing agent, the rust inhibitor is formed by compounding 54wt% of sodium hexametaphosphate, 30wt% of ammonium molybdate and 16wt% of magnesium fluosilicate, the defoamer is an organic silicon defoamer, the water retaining agent is a cellulose ether water retaining agent, and the set adjusting agent is boric acid.
In the raw materials of the adopted pretreated high-activity mineral admixture, ultrafine microbeads are standard spherical particles, the particle size d10 is less than or equal to 0.5 mu m, d50 is less than or equal to 3 mu m, d95 is less than or equal to 10 mu m, the activity index 7d is more than 80 percent, and the activity index 28d is more than 110 percent; the metakaolin is metakaolin with high volcanic ash activity formed by calcining and dehydrating kaolin at 600 ℃; the superfine slag powder is high-fineness and high-activity material prepared by drying and grinding blast furnace slag, and has a specific surface area of more than or equal to 800m 2 /kg。
Example 1
The ultrahigh-strength grouting material provided by the embodiment comprises the following raw materials of 40wt% of ordinary cement, 6wt% of special cement, 40wt% of aggregate, 10wt% of a pretreated high-activity mineral admixture, 2wt% of a composite expanding agent and 2wt% of an additive;
the preparation method of the pretreated high-activity mineral admixture comprises the steps of mixing and stirring 20wt% of superfine microspheres, 10wt% of metakaolin and 70wt% of superfine slag micro powder for 8min, and sieving undersize materials through a 0.315mm square hole sieve.
The preparation method of the ultrahigh-strength grouting material comprises the following steps: firstly, stirring and premixing a composite expanding agent, an additive and 5kg of common cement to prepare a premixed sample; and adding the special cement, the aggregate, the pretreated high-activity mineral admixture and the residual (5 kg of the admixture is subtracted) ordinary cement into the stirrer in sequence for mixing and stirring, slowly adding the prepared premixed sample into the stirrer, and uniformly stirring to obtain the finished ultrahigh-strength grouting material.
Example 2
The ultra-high-strength grouting material provided by the embodiment adopts the raw materials and the preparation method which are basically the same as those of the embodiment 1, and the difference is that the raw materials comprise 50wt% of ordinary cement, 1wt% of special cement, 35wt% of aggregate, 5wt% of pretreated high-activity mineral admixture, 7wt% of composite expanding agent and 2wt% of additive.
Example 3
The ultra-high-strength grouting material provided by the embodiment adopts the raw materials and the preparation method which are basically the same as those of the embodiment 1, and the difference is that the raw materials comprise 30wt% of ordinary cement, 15wt% of special cement, 35wt% of aggregate, 17wt% of pretreated high-activity mineral admixture, 1wt% of composite expanding agent and 2wt% of additive.
Example 4
The ultra-high-strength grouting material provided by the embodiment adopts the raw materials and the preparation method which are basically the same as those of the embodiment 1, and the difference is that the raw materials of the pretreated high-activity mineral admixture comprise 35wt% of ultrafine micro-beads, 5wt% of metakaolin and 60wt% of ultrafine slag micro-powder.
Example 5
The ultra-high-strength grouting material provided by the embodiment adopts the raw materials and the preparation method which are basically the same as those of the embodiment 1, and the difference is that the raw materials of the pretreated high-activity mineral admixture comprise 10wt% of ultrafine micro-beads, 20wt% of metakaolin and 70wt% of ultrafine slag micro-powder.
Comparative example 1
The ultra-high strength grouting material provided by the comparative example adopts the raw materials and the preparation method which are basically the same as those of the example 1, and the difference is that the raw materials comprise 20wt% of common cement, 60wt% of special cement, 15wt% of aggregate, 2wt% of pretreated high-activity mineral admixture, 1wt% of composite expanding agent and 2wt% of additive.
Comparative example 2
The ultra-high strength grouting material provided by the comparative example adopts the raw materials and the preparation method which are basically the same as those of the example 1, and the difference is that the raw materials comprise 60wt% of ordinary cement, 10wt% of aggregate, 25wt% of pretreated high-activity mineral admixture, 3wt% of composite expanding agent and 2wt% of additive, and the ultra-high strength grouting material does not contain special cement.
The preparation method of the ultrahigh-strength grouting material of the comparative example comprises the following steps: firstly, stirring and premixing a composite expanding agent, an additive and 5kg of common cement to prepare a premixed sample; and adding aggregate, the pretreated high-activity mineral admixture and the residual (5 kg of the admixture is subtracted) ordinary cement into the stirrer in sequence for mixing and stirring, slowly adding the prepared premixed sample into the stirrer, and uniformly stirring to obtain the finished product of the ultrahigh-strength grouting material.
Comparative example 3
The ultra-high-strength grouting material provided by the comparative example adopts the raw materials and the preparation method which are basically the same as those of the example 1, and the difference is that the raw materials of the pretreated high-activity mineral admixture comprise 45wt% of superfine micro-beads, 1wt% of metakaolin and 54wt% of superfine slag micro-powder.
Comparative example 4
The ultra-high strength grouting material provided by the comparative example adopts the same raw materials and preparation method as those in the example 1, and the difference is that the raw materials of the pretreated high-activity mineral admixture comprise 5wt% of ultrafine microspheres, 30wt% of metakaolin and 65wt% of ultrafine slag micropowder.
Comparative example 5
The ultra-high-strength grouting material provided by the comparative example adopts the raw materials and the preparation method which are basically the same as those of the example 1, and the difference is that the raw materials of the pretreated high-activity mineral admixture comprise 20wt% of stone powder, 10wt% of metakaolin and 70wt% of superfine slag micropowder. The stone powder replaces the raw material of the superfine microspheres and does not play the function of the superfine microspheres.
Comparative example 6
The ultra-high strength grouting material provided by the comparative example adopts the same raw materials and preparation method as those in the example 1, and the difference is that the raw materials of the pretreated high-activity mineral admixture comprise 20wt% of ultrafine microspheres, 10wt% of stone powder and 70wt% of ultrafine slag micropowder. The stone powder replaces metakaolin which is a raw material and does not play a role of metakaolin.
Comparative example 7
The ultrahigh-strength grouting material provided by the comparative example adopts the raw materials and the preparation method which are basically the same as those of the example 1, and the difference is that the raw materials of the pretreated high-activity mineral admixture comprise 20wt% of superfine microspheres, 10wt% of metakaolin and 70wt% of stone powder. The stone powder replaces the superfine slag powder of the raw material and does not play the function of the superfine slag powder.
Comparative example 8
The standard common sleeve grouting material is sold in the market and performs JG/T408-2013 sleeve grouting material for reinforcing steel bar connection.
Comparative example 9
The raw materials adopted by the ultra-high-strength grouting material provided by the comparative example are completely the same as those in the examples, but the difference is that all the raw materials are directly prepared by adopting simple mechanical mixing, namely all the raw materials are poured into a stirrer at one time and stirred to prepare the ultra-high-strength grouting material.
Application example: physical Properties of grouting materials of examples and comparative examples
The sleeve grouting materials prepared in the examples 1-5 and the comparative examples 1-9 are mixed with water according to the water-material ratio of 0.11 to prepare liquid grouting materials, and the common sleeve grouting materials in the comparative example 7 are mixed according to the recommended water-material ratio on a packaging bag to prepare liquid grouting materials. The liquid grouting material of each embodiment or comparative example is tested for initial fluidity, 30min fluidity and 1d, 3d and 28d compressive strength according to the requirements of JG/T408-2013 sleeve grouting material for connecting steel bars; the 28d bond strength was tested according to the method disclosed in appendix A of the above-mentioned standards (see also methods disclosed in "mechanical Properties of Large volume slag Sleeve grouting materials", zhoushai et al, new building materials 2020,47 (07): 16-19 "). The test results are shown in table 1 below.
TABLE 1 physical Properties of grouting materials of examples and comparative examples
As can be seen from the above Table 1, when the raw materials of the grouting material are changed, the physical properties of the grouting material are affected to a certain extent, and when any one of the three raw materials of the pretreated high-activity mineral admixture is lacked, the physical properties of the grouting material are also affected to a large extent. The reinforcement bond property of the grouting material prepared by the method of the invention (example 5) is improved by 65% compared with the common grouting material which meets the JG/T408-2013 requirement of the comparison example 7, and the reinforcement bond property is obviously improved.
The above-described embodiments and comparative examples are merely illustrative of the principles of the present invention and its efficacy, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (9)
1. The ultrahigh-strength grouting material for the connection of the assembled bridge reinforcing steel bar sleeve is characterized by comprising the following raw materials: 40wt% of ordinary cement, 6wt% of special cement, 40wt% of aggregate, 10wt% of pretreated high-activity mineral admixture, 2wt% of composite expanding agent and 2wt% of additive;
the preparation method of the pretreated high-activity mineral admixture comprises the following steps: mixing and stirring 20wt% of superfine microsphere, 10wt% of metakaolin and 70wt% of superfine slag micropowder for 6-10min, and sieving undersize products with a 0.315mm square hole sieve.
2. The ultrahigh-strength grouting material for the reinforcement sleeve connection of the assembled bridge as claimed in claim 1, which is prepared from the following raw materials: 40wt% of ordinary cement, 6wt% of special cement, 40wt% of aggregate, 10wt% of pretreated high-activity mineral admixture, 2wt% of composite expanding agent and 2wt% of additive.
3. The ultra-high-strength grouting material for the assembled bridge steel bar sleeve connection according to claim 1, wherein the ultra-fine micro-beads are standard spherical particles with a particle size d 10 ≤0.5μm，d 50 ≤3μm，d 95 Less than or equal to 10 mu m, the activity index 7d is more than 80 percent, and the activity index 28d is more than 110 percent; the metakaolin is prepared by calcining and dehydrating kaolin; the superfine slag micropowder is prepared by drying and grinding blast furnace slag and has a specific surface area of more than or equal to 800m 2 /kg。
4. The ultrahigh-strength grouting material for the assembled bridge steel bar sleeve connection according to claim 1 or 2, wherein the ordinary cement is portland cement and/or ordinary portland cement with the strength grade d being more than or equal to 42.5, and the special cement is at least one of sulphoaluminate cement, magnesium phosphate cement and high-alumina cement; the aggregate is composed of continuous graded quartz sand and/or low-grade steel slag.
5. The ultrahigh-strength grouting material for the assembled bridge steel bar sleeve connection according to claim 4, wherein the aggregate is composed of the continuous graded quartz sand and low-grade steel slag, and the low-grade steel slag accounts for 0-50% of the total mass of the aggregate.
6. The ultrahigh-strength grouting material for the assembled bridge steel bar sleeve connection according to claim 1 or 2, wherein the composite expanding agent comprises 0.4-5wt% of a plastic expanding agent, 50-80wt% of a calcium oxide-calcium sulphoaluminate expanding agent and 15-48wt% of a magnesium oxide expanding agent.
7. The ultrahigh-strength grouting material for the connection of the assembled bridge reinforcing steel bar sleeve as claimed in claim 1 or 2, wherein the additive comprises 30-70wt% of water reducing agent, 10-30wt% of rust inhibitor, 5-15wt% of defoaming agent, 3-15wt% of water retaining agent and 3-15wt% of pour point modifier.
8. The ultrahigh-strength grouting material for the connection of the assembled bridge reinforcement sleeve as claimed in claim 7, wherein the water reducing agent is a polycarboxylic acid water reducing agent, the rust inhibitor comprises at least one of phosphate, molybdate and fluosilicate, the defoamer is an organosilicon defoamer, and the water retaining agent is cellulose ether and/or biogum; the coagulation regulator is at least one of boric acid, sodium gluconate, tartaric acid, tartrate, citric acid, citrate and metaphosphate.
9. The preparation method of the ultrahigh-strength grouting material for the connection of the fabricated bridge steel bar sleeve of claim 1 or 2, characterized in that the composite expanding agent and the additive are stirred and premixed with part of the common cement to prepare a premixed sample; and in addition, mixing and stirring the special cement, the aggregate, the pretreated high-activity mineral admixture and the residual ordinary cement uniformly, adding the premixed sample, and stirring uniformly to obtain a finished product of the ultrahigh-strength grouting material.
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| CN202110396271.3A CN113185242B (en) | 2021-04-13 | 2021-04-13 | Ultrahigh-strength grouting material for connecting assembled bridge reinforcement sleeve and preparation method thereof |
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| CN202110396271.3A CN113185242B (en) | 2021-04-13 | 2021-04-13 | Ultrahigh-strength grouting material for connecting assembled bridge reinforcement sleeve and preparation method thereof |
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| CN113185242B true CN113185242B (en) | 2023-03-10 |
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| CN114031349A (en) * | 2021-11-30 | 2022-02-11 | 江苏博拓新型建筑材料股份有限公司 | Wind power high-strength grouting material and preparation method thereof |
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