CN113185242A - Ultrahigh-strength grouting material for connecting assembled bridge reinforcing steel bar sleeve and preparation method thereof - Google Patents
Ultrahigh-strength grouting material for connecting assembled bridge reinforcing steel bar sleeve and preparation method thereof Download PDFInfo
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- CN113185242A CN113185242A CN202110396271.3A CN202110396271A CN113185242A CN 113185242 A CN113185242 A CN 113185242A CN 202110396271 A CN202110396271 A CN 202110396271A CN 113185242 A CN113185242 A CN 113185242A
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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
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- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
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 30-50 wt% of raw material ordinary cement, 1-15 wt% of special cement, 35-50 wt% of aggregate, 5-20 wt% of pretreated high-activity mineral admixture, 1-7 wt% of composite expanding agent and 0.1-5 wt% of additive; the pretreated high-activity mineral admixture is prepared by mixing and stirring 10-35 wt% of superfine microspheres, 5-20 wt% of metakaolin and 60-85 wt% of superfine slag micro powder for 6-10min, and sieving undersize materials with a 0.315mm square hole sieve. The ultrahigh-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 ultrahigh-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 an assembled bridge reinforcing steel sleeve.
Background
In recent years, a new round of prefabricated building has risen all over the country. At present, the domestic assembly type building has completed the transition from the pilot demonstration stage to the comprehensive promotion stage, presents a good development trend, and gradually drives the building industry to move towards the 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 connected by sleeve grouting is not required to be less than 12mm and not required to be more than 40 mm. This limits the use of large-sized steel 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 connecting high-temperature steel bars, which is prepared from cementing materials, aggregates, stabilizers, organic 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 stage expanding agent, defoaming agent, early strength agent, water-retaining agent, rust inhibitor and water. For another example, the fast hardening sleeve grouting material for steel bar connection provided by chinese granted patent CN107935517B, the raw materials include 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: 30-50 wt% of ordinary cement, 1-15 wt% of special cement, 35-50 wt% of aggregate, 5-20 wt% of pretreated high-activity mineral admixture, 1-7 wt% of composite expanding agent and 0.1-5 wt% of additive;
the preparation method of the pretreated high-activity mineral admixture comprises the following steps: mixing and stirring 10-35 wt% of superfine microsphere, 5-20 wt% of metakaolin and 60-85 wt% of superfine slag micropowder for 6-10min, and sieving the mixture with a 0.315mm square hole sieve to obtain the superfine slag micro-powder.
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-plus 2013 sleeve grouting material for reinforcement connection, the reinforcement bond property is improved by over 50 percent. 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 130 MPa.
Preferably, the raw materials of the ultra-high strength grouting material comprise 40 wt% of ordinary cement, 6 wt% of special cement, 40 wt% of aggregate, 10 wt% of a pretreated high-activity mineral admixture, 2 wt% of a composite expanding agent and 2 wt% of an additive.
Preferably, the raw materials of the pretreated high-activity mineral admixture comprise 20 wt% of ultrafine micro-beads, 10 wt% of metakaolin and 70 wt% 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, the particle size d50 is less than or equal to 3 mu m, the particle size d95 is less than or equal to 10 mu m, the activity index 7d is more than 80 percent, and the particle size 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 800m2/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 continuously graded quartz sand and/or low-grade steel slag. The low-grade steel slag aggregate is metallurgical waste slag which is generated in the process of smelting steel and takes oxides of silicon and aluminum as main components, the autoclave stability is less than 0.8 percent, and the particle size is 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 0.4-5 wt% of plastic expanding agent, 50-80 wt% of calcium oxide-calcium sulphoaluminate expanding agent and 15-48 wt% 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 140 s.
Preferably, the admixture comprises 30-70 wt% of water reducing agent, 10-30 wt% of rust inhibitor, 5-15 wt% of defoaming agent, 3-15 wt% of water retaining agent and 3-15 wt% 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 defoaming agent is an organosilicon defoaming agent, 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 5kg) 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 disclosed 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 standard common sleeve grouting material sold in the market and executing JG/T408 auxiliary 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 130 MPa;
3. the high-performance water reducing agent and the high-activity mineral admixture respectively have high water reducing rate and ball effect, good construction performance can be still ensured when the water-material ratio is 0.11-0.13, the initial fluidity is 320-345 mm, and the fluidity is still kept 300-320 mm in 30 min;
4. the ultrahigh-strength grouting material provided by the invention uses low-grade metal slag as the 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 grading 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% in total. (ii) a The adopted low-grade steel slag is metallurgical slag which is generated in the process of smelting steel and takes oxides of silicon and aluminum as main components, 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 140 s.
The admixture consists of 60 wt% of water reducing agent, 12 wt% of rust inhibitor, 10 wt% of defoaming agent, 7 wt% of water retaining agent and 11 wt% of coagulation regulator; the water reducing agent is a polycarboxylic acid water reducing agent, the rust inhibitor is formed by compounding 54 wt% of sodium hexametaphosphate, 30 wt% of ammonium molybdate and 16 wt% of magnesium fluosilicate, the defoaming agent is an organic silicon defoaming agent, the water retaining agent is a cellulose ether water retaining agent, and the thickening time control agent is boric acid.
In the raw materials of the 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 is more than 80 percent, and 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 800m2/kg。
Example 1
The ultrahigh-strength grouting material provided by the embodiment comprises the following raw materials of 40 wt% of ordinary cement, 6 wt% of special cement, 40 wt% of aggregate, 10 wt% of a pretreated high-activity mineral admixture, 2 wt% of a composite expanding agent and 2 wt% of an additive;
the preparation method of the pretreated high-activity mineral admixture comprises the steps of mixing and stirring 20 wt% of superfine microspheres, 10 wt% of metakaolin and 70 wt% of superfine slag micro powder for 8min, and sieving undersize products with a square hole of 0.315 mm.
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 special cement, aggregate, the pretreated high-activity mineral admixture and the rest (minus 5kg) of 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.
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 50 wt% of ordinary cement, 1 wt% of special cement, 35 wt% of aggregate, 5 wt% of pretreated high-activity mineral admixture, 7 wt% of composite expanding agent and 2 wt% 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 30 wt% of ordinary cement, 15 wt% of special cement, 35 wt% of aggregate, 17 wt% of pretreated high-activity mineral admixture, 1 wt% of composite expanding agent and 2 wt% 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 35 wt% of ultrafine micro-beads, 5 wt% of metakaolin and 60 wt% 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 10 wt% of ultrafine micro-beads, 20 wt% of metakaolin and 70 wt% 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 20 wt% of common cement, 60 wt% of special cement, 15 wt% of aggregate, 2 wt% of pretreated high-activity mineral admixture, 1 wt% of composite expanding agent and 2 wt% 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 60 wt% of ordinary cement, 10 wt% of aggregate, 25 wt% of pretreated high-activity mineral admixture, 3 wt% of composite expanding agent and 2 wt% 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 the aggregate, the pretreated high-activity mineral admixture and the residual (minus 5kg) of 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 45 wt% of superfine micro-beads, 1 wt% of metakaolin and 54 wt% of superfine slag micro-powder.
Comparative example 4
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 5 wt% of superfine microspheres, 30 wt% of metakaolin and 65 wt% of superfine 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 20 wt% of stone powder, 10 wt% of metakaolin and 70 wt% of superfine slag micropowder. The stone powder replaces the raw material superfine micro-beads and does not play the function of the superfine micro-beads.
Comparative example 6
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 20 wt% of ultrafine micro-beads, 10 wt% of stone powder and 70 wt% of ultrafine slag micro-powder. The stone powder replaces metakaolin which is a raw material and does not have the function 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 20 wt% of superfine microspheres, 10 wt% of metakaolin and 70 wt% 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 JG/T408 execution 2013 sleeve grouting material for connecting steel bars is adopted.
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 examples 1-5 and comparative examples 1-9 are mixed with water according to the water-material ratio of 0.11 to prepare liquid grouting material, and the common sleeve grouting material in comparative example 7 is mixed according to the recommended water-material ratio on a packaging bag to prepare liquid grouting material. The liquid grouting material of each embodiment or the comparative example is tested for initial fluidity, 30min fluidity, 1d compressive strength, 3d compressive strength 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 bonding performance of the reinforcing steel bar prepared by the method disclosed by the invention (embodiment 5) is improved by 65% compared with the common grouting material which meets the requirements of JG/T408-containing 2013 in the comparison ratio 7, and the bonding performance of the reinforcing steel bar is obviously improved.
The above-mentioned embodiments and comparative examples are only 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 inventive concept of the present invention, and these are within the scope of the present invention.
Claims (10)
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: 30-50 wt% of ordinary cement, 1-15 wt% of special cement, 35-50 wt% of aggregate, 5-20 wt% of pretreated high-activity mineral admixture, 1-7 wt% of composite expanding agent and 0.1-5 wt% of additive;
the preparation method of the pretreated high-activity mineral admixture comprises the following steps: mixing and stirring 10-35 wt% of superfine microsphere, 5-20 wt% of metakaolin and 60-85 wt% of superfine slag micropowder for 6-10min, and sieving the mixture with a 0.315mm square hole sieve to obtain the superfine slag micro-powder.
2. The ultrahigh-strength grouting material for the assembled bridge steel bar sleeve connection according to claim 1, characterized by comprising the following raw materials: 40 wt% of ordinary cement, 6 wt% of special cement, 40 wt% of aggregate, 10 wt% of pretreated high-activity mineral admixture, 2 wt% of composite expanding agent and 2 wt% of additive.
3. The ultrahigh-strength grouting material for the fabricated bridge reinforcement sleeve connection according to claim 1 or 2, wherein the raw materials of the pretreated high-activity mineral admixture comprise 20 wt% of ultrafine micro-beads, 10 wt% of metakaolin and 70 wt% of ultrafine slag micro-powder.
4. The ultra-high-strength grouting material for the assembled bridge steel bar sleeve connection according to claim 3, wherein the ultra-fine micro-beads are standard spherical particles with a particle size d10≤0.5μm，d50≤3μm，d95Less 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 800m2/kg。
5. 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 continuously graded quartz sand and/or low-grade steel slag.
6. The ultrahigh-strength grouting material for the assembled bridge steel bar sleeve connection according to claim 5, 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.
7. 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 0.4-5 wt% of a plastic expanding agent, 50-80 wt% of a calcium oxide-calcium sulphoaluminate expanding agent and 15-48 wt% of a magnesium oxide expanding agent.
8. The ultrahigh-strength grouting material for the assembled bridge steel bar sleeve connection according to claim 1 or 2, wherein the additive comprises 30-70 wt% of a water reducing agent, 10-30 wt% of a rust inhibitor, 5-15 wt% of a defoaming agent, 3-15 wt% of a water retaining agent and 3-15 wt% of a coagulation regulator.
9. The ultrahigh-strength grouting material for the assembled bridge steel bar sleeve connection of claim 8, 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 defoaming agent is an organosilicon defoaming agent, 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.
10. 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 rest of the ordinary cement uniformly, adding the premixed sample, and stirring uniformly to obtain the finished product of the ultrahigh-strength grouting material.
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