CN116082000B - High-performance steel bar sleeve grouting material - Google Patents
High-performance steel bar sleeve grouting material Download PDFInfo
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- 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
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
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- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
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- 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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- 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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Abstract
The invention belongs to the field of building construction, and particularly relates to a high-performance grouting material for a steel bar sleeve. Mainly prepares B-doped carbon nano-tube and (Re/Mo) S 2 Wherein, the doping of B element in B-CNTs/fly ash improves the combination capability of carbon nano tube and fly ash, which is beneficial to the B-CNTs/fly ash to be more fully mixed in grouting materials. (Re/Mo) S 2 The material is of a two-dimensional layered structure, is doped into grouting material, can effectively improve the compressive strength of the grouting material, has different atomic sizes of Mo and Re, can know that atomic acting force exists between Re and Mo according to an atomic motion rule, can ensure that the material can keep moving even at low temperature, and plays a role in micro crack pouring. And CsOH is doped into the grouting material, so that the grouting material is hydrated under the low-temperature condition and reacts with mineral admixtures, especially mineral powder, in the grouting material, thereby improving the early strength of the grouting material.
Description
Technical Field
The invention belongs to the field of building construction, and mainly relates to a reinforcing steel bar sleeve grouting material, in particular to a high-performance reinforcing steel bar sleeve grouting material.
Background
The traditional concrete construction adopts a cast-in-situ construction method, namely an operation method for carrying out construction on a construction site according to the sequence of binding reinforcing steel bars, setting up templates, pouring and curing concrete. The working mode has the advantages of long construction period, low industrialization degree, low labor productivity, serious material waste, unstable construction quality, incapability of guaranteeing the quality of building products, overlarge resource consumption and the like. According to statistics of related departments, the total energy consumption generated in building material production in China every year reaches 16.7% of the total national value, the energy consumption for building is more than 37%, and only one building rubbish accounts for more than 30% of the total urban rubbish. On the other hand, as the aging degree of the society increases, the problem of labor shortage in the construction industry becomes prominent, and labor cost increases year by year. Obviously, the production mode with high pollution, high consumption and high emission is difficult to adapt to the new requirements of the social and economic development of the present stage of China, and the transformation and upgrading of the building industry are urgent. The assembled building is a break for promoting the transformation and upgrading of the building, and is formed by connecting prefabricated components of factories on a construction site through a connecting technology. Because the working procedures of pouring, curing and the like of the concrete member are finished in factories, compared with a cast-in-place concrete structure building, the fabricated building has the advantages of high construction speed, high degree of mechanization, less labor force demand, high member product quality, energy conservation, environmental protection and the like, and can well solve a plurality of pain points existing in the cast-in-place construction method. Therefore, under the great background that green building modes are advocated currently in China, the assembled concrete structure building is rapidly developed.
The assembled building is a building form which is produced into components by building materials in advance, and a construction unit combines the light materials by adopting a plurality of light steel structures on site, has the functions of energy conservation, earthquake resistance, heat preservation, sound insulation, fire prevention and the like, and becomes an important direction of the development of future building structures. The main concern in fabricated building structures is the connection between structural nodes and the connection of longitudinal rebars, and the rebar sleeve connection technology is the primary connection technology employed in reinforced concrete fabricated buildings. Whether the construction quality of sleeve grouting is qualified or not relates to whether the connection of the whole engineering is safe, the temperature is one of very important construction conditions, the safety requirement is that the construction is difficult at <5 ℃, the construction is not performed at <0 ℃, the long-term development of the assembled building is greatly restricted, and the construction unit are greatly confused and limited in terms of construction organization and progress management. Therefore, developing a high-performance grouting material for the steel bar sleeve suitable for low-temperature environment will certainly promote the development of the assembled building form, and has positive influence on the economy and society.
Disclosure of Invention
Aiming at the problems, the invention provides a high-performance steel bar sleeve grouting material, and the performance of the grouting material is tested, and the concrete operation steps are as follows:
s1, modifying fly ash by using a boron-doped carbon nano tube: weighing 20-40g of fly ash, dispersing in 400-600ml of 1-3M HCl solution, stirring for 10-20min to remove impurities on the surface of the fly ash, washing with 1:3 volume ratio of absolute ethanol and distilled water to neutrality, adding 150-180ml of ethanol, adding 100-150ml of pyrrole and 50-80ml of N-methyl-2-pyrrolidone, continuously stirring for 20-30min, adding 3-5g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123), stirring uniformly, and adding 10-30ml of 1-3M NaBH 4 Placing into ultrasonic wave, and performing ultrasonic treatment for 10-20min. Transferring the mixture into a closed microwave chemical reactor, reacting for 2-5min at 150-200 ℃, centrifugally separating and drying to obtain the carbon nano tube modified fly ash doped with boron, and naming the modified fly ash as B-CNTs/pulverized coal. The B-doped carbon nano tube prepared in the step is a two-dimensional nano material, has the appearance similar to nano-scale fiber, and mainly plays roles of preventing crack growth and increasing toughness of the grouting material in the grouting material prepared by the invention. And the doping of the B element improves the combination capability of the carbon nano tube and the fly ash, and is beneficial to the B-CNTs/fly ash to be more fully mixed in the grouting material. In addition, the use of N-methyl-2-pyrrolidone increases the N content of the surface of the fly ash, increases the hydrophilicity of the surface of the fly ash, and enables the boron-doped carbon nano tube to be more easily attached to the surface of the fly ash.
S2, preparing two-dimensional nano material (Re/Mo) S 2 : 2-5g ammonium perrhenate, 2-4g ammonium molybdate, 3-5g thiosulfateAdding sodium and 5-8g of thiourea into 200ml of deionized water, stirring uniformly, transferring into a stainless steel reaction kettle, heating to 250-300 ℃ for 18-24h, cooling to room temperature after the reaction is finished, centrifuging and drying to obtain (Re/Mo) S with a two-dimensional lamellar structure 2 . (Re/Mo) S prepared by this step 2 The two-dimensional layered structure is doped into grouting material, so that the compressive strength of the grouting material can be effectively improved, the atomic sizes of Mo and Re are different, the atomic acting force exists between Re and Mo according to the atomic motion law, the material can be ensured to keep moving even at low temperature, and the effect of micro crack pouring is achieved.
S3, preparing grouting material: 780-850g of cement, 750-880g of river sand, 40-70g of silica fume, 50-70g of mineral powder, 10-25g of polycarboxylate water reducer, 1-3g of polyoxypropylene ethylene oxide glycerol ether, 0.1-0.6g of plastic expanding agent, 10-25g of UEA expanding agent, 4-6g of sodium dodecyl sulfate, 8-15g of calcium formate, 0.2-0.8g of CsOH, 45-55g of B-CNTs/fly ash prepared in the step S1 and 10-15g of two-dimensional lamellar (Re/Mo) S prepared in the step S2 2 Pouring the mixture into a JJ-5 planetary cement mortar stirring pot, firstly dry-stirring the mixture for 3-5min, then slowly adding 180-320g of water, adjusting the mixture to be stirred slowly for 5min, stopping stirring for 40s, rapidly stirring for 8min to ensure that the grouting material has good fluidity, filling the grouting material into a mortar test mold with the thickness of 40mm multiplied by 160mm after stirring, standing and curing in a greenhouse for 20h, removing the mold, and then placing the mold in a standard curing box, wherein the curing temperature is 20+/-1 ℃ and the humidity is 99%, thus obtaining the high-performance reinforcing steel bar sleeve grouting material suitable for a low-temperature environment. The polycarboxylic acid water reducer can effectively increase the expansion degree of grouting materials, and the slump retaining performance of grouting materials doped with the polycarboxylic acid water reducer is improved; the polyoxypropylene ethylene oxide glycerol ether has the characteristics of long foam inhibition time, good effect, high defoaming speed, good thermal stability and the like; the calcium formate incorporation can increase Ca in the liquid phase 2+ Concentration, ca (OH) in the slurry can be accelerated due to homoionic effects 2 The crystal precipitation of the solid phase material is improved, the proportion of the solid phase material is increased, the formation of a cement stone structure is facilitated, in addition, csOH added in the step belongs to an alkaline material, and CsOH can be carried out with mineral powder in grouting material in the hydration processThe early strength of the grouting material can be effectively improved in a low-temperature environment.
S4, grouting test: in a low-temperature environment, two sections of steel bars with the diameter of 22mm are inserted into the full grouting sleeve joint, the grouting material cured in the step S3 is poured in from the upper port by adopting a manual grouting gun, and iron wires are used for vibrating, so that the grouting material fills the sleeve. After grouting, the grouting opening is covered by a plastic film, so that the influence of water volatilization on the performance of the grouting material is reduced.
Preferably: the coal ash powder selected in the step S1 is 35g.
Preferably: 130ml of pyrrole and 75ml of N-methyl-2-pyrrolidone are optionally added in the step S1.
Preferably: in the step S1, 25mL of 2M NaBH is added 4 。
Preferably: in step S2, 2g of ammonium perrhenate and 3g of ammonium molybdate are added.
Preferably: in step S2, 2g of sodium thiosulfate and 3g of thiourea were added.
Preferably: the heating temperature in the step S2 is 280 ℃, and the heating time is 21h.
Preferably: 780g of cement, 750g of river sand, 40g of silica fume, 50g of mineral powder, 10g of polycarboxylate water reducer, 1g of polyoxypropylene ethylene oxide glycerol ether, 0.1g of plastic expanding agent, 10g of UEA expanding agent, 4g of sodium dodecyl sulfate, 8g of calcium formate, 0.2g of CsOH, 45g of B-CNTs/fly ash prepared in the step S1 and 10g of two-dimensional lamellar (Re/Mo) S prepared in the step S2 are mixed in the step S3 2 Pouring the mixture into a JJ-5 planetary cement mortar stirring pot.
Preferably: 50g of the B-CNTs/fly ash prepared in the step S1 and 12g of the two-dimensional lamellar (Re/Mo) S prepared in the step S2 are added into the step S3 2 。
Preferably: the microwave chemical reactor used in step S2 of the present invention is SINEO MAS-II PLUS, sineo.
Preferably: the invention selects Portland cement of model P II 52.5 produced by Anhui copper-clad conch cement Co., ltd, and the density is 31g/cm 3 。
Preferably: the invention selects ELKEN 920U-shaped silica fume produced by Aiken International trade company.
Preferably: the invention selects river sand with aggregate grain diameter of 0.075-2.36mm, which is produced by Hebei Bao Ting engineering construction company.
Preferably: the invention selects the class I fly ash provided by Zhenjiang Jiang department with density of 2.25g/cm 3 A specific surface area of 432m 2 /kg。
Preferably: the invention selects plastic expanding agent produced by Fuyang city south building material company.
Preferably: the invention selects the concentrated silicone defoamer AFE-0050 produced by Nanjing danshenpei chemical industry Co.
Preferably: the invention selects the full grouting sleeve provided by Shanghai Li Wu Bao construction technology Co.Ltd.
Preferably: the invention selects HRB400 grade steel bars with the diameter of 20mm.
Preferably: the invention selects Sika viscoCrete 540P polycarboxylic acid type high-performance water reducer produced by Sika corporation.
The invention has the beneficial effects that:
1. the B-doped carbon nano tube is a two-dimensional nano material, has the appearance similar to nano-scale fiber, and mainly plays roles of preventing crack growth and increasing toughness of grouting material in the grouting material prepared by the invention.
2. The doping of B element in the B-CNTs/fly ash prepared by the method improves the binding capacity of the carbon nano tube and the fly ash, and is favorable for fully mixing the B-CNTs/fly ash in grouting materials. In addition, the use of N-methyl-2-pyrrolidone increases the N content of the surface of the fly ash, increases the hydrophilicity of the surface of the fly ash, and enables the boron-doped carbon nano tube to be more easily attached to the surface of the fly ash.
3. The invention prepares (Re/Mo) S 2 The material is of a two-dimensional layered structure, is doped into grouting material, can effectively improve the compressive strength of the grouting material, has different atomic sizes of Mo and Re, can know that atomic acting force exists between Re and Mo according to an atomic motion rule, can ensure that the material keeps moving even at low temperature and plays a role in microminiaturizationAnd (3) observing the effect of pouring the seam.
4. The CsOH is mixed into the grouting material, so that the CsOH is hydrated under the low-temperature condition and reacts with mineral admixtures, especially mineral powder, in the grouting material, thereby improving the early strength of the grouting material.
5. Preparation of B-CNTs/fly ash and (Re/Mo) S 2 The composite material is doped into grouting material, so that the compressive strength of the grouting material, a two-dimensional layered structure and a nanotube structure can be effectively improved, the composite material mainly plays a role similar to fibers in the grouting material, and the compressive strength of the grouting material is enhanced.
Drawings
FIG. 1 is a scanning electron microscope image of the fly ash selected in example 1 of the present invention after hydrochloric acid treatment.
FIG. 2 is a scanning electron microscope image of the B-CNTs/pulverized coal prepared in example 1 of the present invention.
FIG. 3 is a transmission electron microscope image of the B-CNTs/pulverized coal prepared in example 1 of the present invention.
FIG. 4 shows the production of (Mo) S in comparative example 3 of the present invention 2 Is a scanning electron microscope image of (c).
FIG. 5 shows the preparation of (Re/Mo) S in example 2 of the present invention 2 Is a scanning electron microscope image of (c).
FIG. 6 is a graph showing the cumulative porosity of the grouting materials prepared in example 3 and comparative examples 5 and 6 according to the present invention.
Fig. 7 is a graph of a full grout sleeve used in the present invention to test grout properties.
Fig. 8 is a graph showing the breaking condition of the reinforcing steel bars after testing the grouting material performance according to example 4 of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
S1、Modifying fly ash with boron doped carbon nanotubes: weighing 20g of fly ash, dispersing in 400ml of HCl solution with concentration of 1M, stirring for 10min to remove impurities on the surface of the fly ash, washing to neutrality by using absolute ethanol and distilled water with volume ratio of 1:3, adding 150ml of ethanol, continuously stirring for 20min after adding 100ml of pyrrole and 50ml of N-methyl-2-pyrrolidone, adding 3g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123), stirring uniformly, and adding 10ml of 1M NaBH 4 Ultrasonic treating in ultrasonic wave for 10min. Transferring the mixture into a closed microwave chemical reactor, reacting for 2min at 150 ℃, centrifugally separating and drying to obtain the carbon nano tube modified fly ash doped with boron, and naming the modified fly ash as B-CNTs/pulverized coal.
S2, preparing two-dimensional nano material (Re/Mo) S 2 : adding 2g of ammonium perrhenate, 2g of ammonium molybdate, 3g of sodium thiosulfate and 5g of thiourea into 200ml of deionized water, stirring uniformly, transferring into a stainless steel reaction kettle, heating to 250 ℃ for 18h, cooling to room temperature after the reaction is finished, and centrifugally drying to obtain (Re/Mo) S with a two-dimensional lamellar structure 2 . (Re/Mo) S prepared by this step 2 The two-dimensional layered structure is doped into grouting material, so that the compressive strength of the grouting material can be effectively improved, the atomic sizes of Mo and Re are different, the atomic acting force exists between Re and Mo according to the atomic motion law, the material can be ensured to keep moving even at low temperature, and the effect of micro crack pouring is achieved.
S3, preparing grouting material: 780g of cement, 750g of river sand, 40g of silica fume, 50g of mineral powder, 10g of polycarboxylate water reducer, 1g of polyoxypropylene ethylene oxide glycerol ether, 0.1g of plastic expanding agent, 10g of UEA expanding agent, 4g of sodium dodecyl sulfate, 8g of calcium formate, 0.2g of CsOH, 45g of B-CNTs/fly ash prepared in the step S1 and 10g of two-dimensional lamellar (Re/Mo) S prepared in the step S2 2 Pouring into a JJ-5 planetary cement mortar stirring pot, dry-stirring the mixture for 3min, slowly adding 180g of water, regulating to slow stirring for 5min, stopping 40s, and rapidly stirring for 8min to obtain good fluidity, stirring, and loading into a container of 40mm×40mm×And (3) in a 160mm mortar test mould, standing and curing for 20 hours in a greenhouse, removing the mould, and then placing in a standard curing box, wherein the curing temperature is 20+/-1 ℃ and the humidity is 99%, so that the high-performance steel bar sleeve grouting material can be obtained.
Comparative example 1: except that NaBH is not added in step S1 4 The remaining steps were the same as in example 1, except for the above.
Comparative example 2: the steps are the same as in example 1 except that the fly ash is used in step S3 instead of B-CNTs/fly ash.
The fluidity testing method of the grouting material prepared by the invention tests the fluidity and the compressive strength of the sleeve grouting material according to JGT 408-2013 sleeve grouting material for reinforcing steel bar connection. The method for testing the mechanical properties of the grouting material comprises the following steps: the sizes of test samples are 40mm multiplied by 160mm, each 3 test samples are in a group, the compressive strength of the test samples is 1d, 7d, 28d and 56d, the test is carried out by using a full-automatic fracture-resistant compression-resistant constant stress testing machine with the model of DTE-300B, and the test method is carried out according to the requirements of GB/T17671.
Table 1 example 1 and comparative examples 1, 2 preparation of sleeve grouting properties
Table 1 shows statistics of performance test results of the sleeve grouting materials prepared in the embodiment 1 and the comparative examples 1 and 2, and comparison data shows that the slurry added with the B-CNTs/fly ash has the best flowability and compressive strength effect. The best effect of the invention is not achieved by adding only carbon nano tubes and the fly ash which is not doped by B. Therefore, the doping of the B element improves the combination capability of the carbon nano tube and the fly ash, is beneficial to fully mixing the B-CNTs/the fly ash in the grouting material, and does not reduce the fluidity of the grouting material. FIG. 1 is a scanning electron microscope image of the fly ash selected in example 1 of the present invention after hydrochloric acid treatment. As can be seen from the figure, the undisturbed fly ash is approximately spherical, and the surface is approximately smooth after being treated by hydrochloric acid, so that the fly ash is beneficial to being coated with pyrrole and N-methyl-2-pyrrolidone. FIG. 2 is a scanning electron microscope image of the B-CNTs/pulverized coal prepared in example 1 of the present invention. As can be seen from the figure, a circle of carbon nanotubes are grown on the sphere surface in situ. The invention proves that the carbon nano tube is successfully grown on the surface of the fly ash in situ. FIG. 3 is a transmission electron microscope image of the B-CNTs/pulverized coal prepared in example 1 of the present invention. The dashed circle in the figure is hypothesized to be the doped B element on the carbon nanotube. Therefore, the B-doped carbon nano tube prepared by the invention is a two-dimensional nano material, has the appearance similar to nano-scale fiber, and mainly plays roles of preventing crack growth and increasing toughness of the grouting material in the grouting material prepared by the invention. And the doping of the B element improves the combination capability of the carbon nano tube and the fly ash, and is beneficial to the B-CNTs/fly ash to be more fully mixed in the grouting material. In addition, the use of N-methyl-2-pyrrolidone increases the N content of the surface of the fly ash, increases the hydrophilicity of the surface of the fly ash, and enables the boron-doped carbon nanotubes to be more easily attached to the surface of the fly ash.
Example 2
S1, modifying fly ash by using a boron-doped carbon nano tube: 40g of fly ash is weighed and dispersed in 600ml of HCl solution with the concentration of 3M, the mixture is stirred for 20min to remove impurities on the surface of the fly ash, then the fly ash is washed to be neutral by absolute ethanol and distilled water with the volume ratio of 1:3, 180ml of ethanol is added, 150ml of pyrrole and 80ml of N-methyl-2-pyrrolidone are added, the stirring is continued for 30min, then 5g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) is added, and 30ml of 3M NaBH is added after the uniform stirring 4 And (5) putting the mixture into ultrasonic waves for ultrasonic treatment for 20min. Transferring the mixture into a closed microwave chemical reactor, reacting for 5min at 200 ℃, centrifugally separating and drying to obtain the carbon nano tube modified fly ash doped with boron, and naming the modified fly ash as B-CNTs/pulverized coal.
S2, preparing two-dimensional nano material (Re/Mo) S 2 : 5g of ammonium perrhenate, 4g of ammonium molybdate, 5g of sodium thiosulfate and 8g of sulfurAdding urea into 200ml deionized water, stirring, transferring into a stainless steel reaction kettle, heating to 300 deg.C for 24 hr, cooling to room temperature, centrifuging, and drying to obtain two-dimensional layered structure (Re/Mo) S 2 。
S3, preparing grouting material: 850g of cement, 880g of river sand, 70g of silica fume, 70g of mineral powder, 25g of polycarboxylate water reducer, 3g of polyoxypropylene ethylene oxide glycerol ether, 0.6g of plastic expanding agent, 25g of UEA expanding agent, 6g of sodium dodecyl sulfate, 15g of calcium formate, 0.8g of CsOH, 55g of B-CNTs/fly ash prepared in step S1 and 15g of two-dimensional lamellar (Re/Mo) S prepared in step S2 2 Pouring into a JJ-5 planetary cement mortar stirring pot, firstly dry-stirring the mixture for 5min, then slowly adding 320g of water, adjusting to be stirred slowly for 5min, stopping 40s, rapidly stirring for 8min to ensure that the grouting material has good fluidity, filling into a 40mm multiplied by 160mm mortar test mold after stirring, standing in a greenhouse for maintenance for 20h, removing the mold, and then placing in a standard curing box at a maintenance temperature of 20+/-1 ℃ and a humidity of 99%, thus obtaining the high-performance steel bar sleeve grouting material.
Comparative example 3: the steps are the same as in example 2, except that ammonium perrhenate is not added in step S2.
Comparative example 4: except that (Re/Mo) S is not added in step S3 2 The remaining steps were the same as in example 2, except for the above.
Table 2 example 2 and comparative examples 3, 4 preparation of sleeve grouting properties
Table 2 shows the performance test statistics of the sleeve grouting material prepared in example 2 and comparative examples 3 and 4, and from the data analysis in the table, two-dimensional lamellar (Re/Mo) S is added 2 After the nano material is used, the fluidity of grouting material is reduced to a certain extent, and the grouting material is used forThe findings of the ratio 1 and the example 2 are that the fluidity of the grouting material is not improved after the Re is added, but the fluidity of the grouting material is reduced, and the possible reason is presumably that the formation of small holes on the nano-sheets makes the grouting material more uniform, thereby influencing the fluidity of the grouting material. Although the fluidity of the slurry is not improved after Re is added, the compressive strength thereof is improved. FIG. 4 shows the production of (Mo) S in comparative example 3 of the present invention 2 Is a scanning electron microscope image of (c). Since ammonium perrhenate was not added in comparative example 3, it was designated as (Mo) S 2 From the figure it can be seen that the material is a complete two-dimensional lamellar structure. FIG. 5 shows the preparation of (Re/Mo) S in example 2 of the present invention 2 Is a scanning electron microscope image of (c). It can be seen from the figure that, after Re (rhenium) is introduced, a large number of small holes are formed on the surface of the two-dimensional layered material, and the two-dimensional sheet becomes thicker, which is beneficial to keeping the material moving in the slurry and playing a role of micro-crack pouring in the low-temperature environment so as to improve the compressive strength of the grouting material.
Example 3
S1, modifying fly ash by using a boron-doped carbon nano tube: 30g of fly ash is weighed and dispersed in 500ml of HCl solution with the concentration of 2M, the mixture is stirred for 15min to remove impurities on the surface of the fly ash, then the fly ash is washed to be neutral by absolute ethanol and distilled water with the volume ratio of 1:3, 160ml of ethanol is added, 140ml of pyrrole and 60ml of N-methyl-2-pyrrolidone are added, the stirring is continued for 25min, then 4g of polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer (P123) is added, and 25ml of NaBH with the concentration of 2M is added after the uniform stirring 4 Ultrasonic treating in ultrasonic wave for 15min. Transferring the mixture into a closed microwave chemical reactor, reacting for 4min at 190 ℃, centrifugally separating and drying to obtain the carbon nano tube modified fly ash doped with boron, and naming the modified fly ash as B-CNTs/pulverized coal.
S2, preparing two-dimensional nano material (Re/Mo) S 2 : adding 4g of ammonium perrhenate, 3g of ammonium molybdate, 4g of sodium thiosulfate and 6g of thiourea into 200ml of deionized water, stirring uniformly, transferring into a stainless steel reaction kettle, heating at 260 ℃ for 22 hours, cooling to room temperature after the reaction is finished, and centrifugally drying to obtain the (Re/Mo of the two-dimensional lamellar structure)S 2 。
S3, preparing grouting material: 830g of cement, 860g of river sand, 65g of silica fume, 66g of mineral powder, 22g of polycarboxylate water reducer, 2g of polyoxypropylene ethylene oxide glycerol ether, 0.5g of plastic expanding agent, 18g of UEA expanding agent, 5g of sodium dodecyl sulfate, 13g of calcium formate, 0.7g of CsOH, 50g of B-CNTs/fly ash prepared in step S1 and 12g of two-dimensional lamellar (Re/Mo) S prepared in step S2 2 Pouring into a JJ-5 planetary cement mortar stirring pot, firstly dry-stirring the mixture for 4min, then slowly adding 240g of water, adjusting to be slowly stirred for 5min, stopping 40s, rapidly stirring for 8min to ensure that the grouting material has good fluidity, filling the grouting material into a 40mm multiplied by 160mm mortar test mold after stirring, standing and curing in a greenhouse for 20h, removing the mold, and then placing in a standard curing box, wherein the curing temperature is 20+/-1 ℃ and the humidity is 99%, thus obtaining the high-performance steel bar sleeve grouting material.
Comparative example 5: except that (Re/Mo) S is not added in step S3 2 The remaining steps were the same as in example 3, except for the above.
Comparative example 6: the steps are the same as in example 3 except that the fly ash is used in step S3 instead of B-CNTs/fly ash.
The present invention uses mercury porosimeter to analyze the pore structure of the grouting materials prepared in example 3 and comparative examples 5 and 6. FIG. 6 is a graph showing the cumulative porosity of the grouting materials prepared in example 3 and comparative examples 5 and 6 according to the present invention. From the figure, it can be seen that the porosity of the grouting material prepared in example 3 is the smallest, which shows that the B-doped carbon nano tube is used for modifying the fly ash and (Re/Mo) S in the invention 2 The pore structure of the grouting material is improved together, so that the mechanical property of the grouting material is improved.
Example 4
S1, modifying fly ash by using a boron-doped carbon nano tube: 38g of fly ash is weighed and dispersed in 570ml of HCl solution with the concentration of 2M, the mixture is stirred for 19min to remove impurities on the surface of the fly ash, then the fly ash is washed to be neutral by absolute ethanol and distilled water with the volume ratio of 1:3, 175ml of ethanol is added, 144ml of pyrrole and 72ml of N-methyl-2-pyrrolidone are added, the stirring is continued for 23min, and then 4g of polyethylene oxide-polypropylene oxide-polycyclo are addedEthylene oxide triblock copolymer (P123), after stirring well, 22ml of 2M NaBH was added 4 Ultrasonic treating in ultrasonic wave for 18min. Transferring the mixture into a closed microwave chemical reactor, reacting for 4min at 185 ℃, centrifugally separating and drying to obtain the carbon nano tube modified fly ash doped with boron, and naming the modified fly ash as B-CNTs/pulverized coal.
S2, preparing two-dimensional nano material (Re/Mo) S 2 : adding 3g of ammonium perrhenate, 4g of ammonium molybdate, 4g of sodium thiosulfate and 7g of thiourea into 200ml of deionized water, stirring uniformly, transferring into a stainless steel reaction kettle, heating to 290 ℃ for 23h, cooling to room temperature after the reaction is finished, and centrifugally drying to obtain (Re/Mo) S with a two-dimensional lamellar structure 2 。
S3, preparing grouting material: 810g of cement, 780g of river sand, 66g of silica fume, 68g of mineral powder, 21g of polycarboxylate water reducer, 2g of polyoxypropylene ethylene oxide glycerol ether, 0.5g of plastic expanding agent, 19g of UEA expanding agent, 5g of sodium dodecyl sulfate, 11g of calcium formate, 0.7g of CsOH, 48g of B-CNTs/fly ash prepared in the step S1 and 13g of two-dimensional lamellar (Re/Mo) S prepared in the step S2 2 Pouring into a JJ-5 planetary cement mortar stirring pot, firstly dry-stirring the mixture for 3min, then slowly adding 310g of water, adjusting to be stirred slowly for 5min, stopping 40s, rapidly stirring for 8min to ensure that the grouting material has good fluidity, filling into a 40mm multiplied by 160mm mortar test mold after stirring, standing in a greenhouse for maintenance for 20h, removing the mold, and then placing in a standard curing box at a maintenance temperature of 20+/-1 ℃ and a humidity of 99%, thus obtaining the high-performance steel bar sleeve grouting material.
S4, grouting test: and (3) in a low-temperature environment (0-15 ℃), inserting two sections of steel bars with the diameter of 22mm into the joint of the full grouting sleeve, filling the grouting material cured in the step (S3) from the upper port by adopting a manual grouting gun, and vibrating by using wires to enable the grouting material to fill the sleeve. After grouting, the grouting opening is covered by a plastic film, so that the influence of water volatilization on the performance of the grouting material is reduced.
The cement clinker is hydrated to release alkaline substances such as calcium hydroxide and the mineral powder is reacted with the alkaline substancesAnd the cement material is hydrated for the second time, so that the hydration degree of the cement material is improved. The mineral powder particles and hydration product components thereof fill gaps in cement, so that the compactness of a matrix is improved, and higher strength and durability are obtained. The B-CNTs/pulverized coal powder is characterized by the particle morphology effect of the pulverized coal powder and the micro aggregate performance, so that the pulverized coal powder has the characteristics of small water demand, good bleeding property, small shrinkage resistance, good crack resistance and small hydration heat, and the B-CNTs on the surface of the pulverized coal powder has a fiber-like function and plays a role in enhancing the hardness of grouting materials in the later period. The main component of the silica fume is silicon dioxide with high activity, and the silica fume has hydration reaction with alkaline matter to reduce alkali content in cement material and raise compactness and corrosion resistance, and the silica fume has the functions of filling the gaps between cement grains and two-dimensional nanometer material (Re/Mo) S with gaps 2 There is a synergistic effect between, i.e. using (Re/Mo) S 2 In combination with (Re/Mo) S 2 The small holes on the surface play a role in reinforcing grouting material. In addition, the incorporation of CsOH in the invention increases the compressive strength of the grouting material under the low-temperature condition, and the early hydration process of the grouting material is slowed down under the low-temperature part, so that the calcium hydroxide content of the hydration product is insufficient to excite the activity of the mineral admixture, and therefore, the early strength of the grouting material under the low-temperature condition is not up to the standard, while CsOH belongs to an alkaline substance and can react with the mineral admixture in the grouting material, especially mineral powder, in the hydration process, so that the early strength of the grouting material is improved. Fig. 7 is a graph of a full grout sleeve used in the present invention to test grout properties. Fig. 8 is a graph showing the breaking condition of the reinforcing steel bars after testing the grouting material performance according to example 4 of the present invention. Fig. 8 is a graph showing the breaking condition of the reinforcing steel bars after testing the grouting material performance according to example 4 of the present invention. The grouting material performance type test is carried out by adopting a tensile test and a fatigue test, and the performance quality of the grouting material is judged by the damage mode of the steel bar connecting joint. The damage mode of the grouting joint of the steel bar sleeve mainly comprises three modes of steel bar breakage, steel bar pulling-out and sleeve breakage, and the broken damage of the steel bar occurs because grouting materials, the sleeve and the steel bar have higher bonding strength, so that the tensile strength of the grouting sleeve joint is larger than that of the steel bar, and the broken steel bar is caused, which is an ideal damage mode of the grouting joint of the steel bar sleeve.The sleeve joint in which the steel bar is pulled out to be broken is broken due to poor adhesion between the steel bar and the grouting material, and the sleeve fracture is broken due to poor sleeve strength. In the test of the invention, the sleeve grouting joints formed by the grouting material formula are broken and destroyed by the steel bars, which shows that the grouting material formula obtained by the invention can meet the requirement of the steel bar connection in a low-temperature environment.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A high-performance steel bar sleeve grouting material is characterized in that: the preparation steps of the concrete operation are as follows:
s1, weighing 20-40g fly ash, dispersing the fly ash in 400-600ml HCl solution with the concentration of 1-3M, stirring for 10-20min to remove impurities on the surface of the fly ash, washing the fly ash to be neutral by using absolute ethanol and distilled water with the volume ratio of 1:3, adding 150-180ml ethanol, adding 100-150ml of pyrrole and 50-80ml N-methyl-2-pyrrolidone, continuously stirring for 20-30min, adding 3-5g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, stirring uniformly, and adding 10-30ml NaBH with the concentration of 1-3M 4 Placing the pulverized coal into ultrasonic waves for ultrasonic treatment for 10-20min, transferring the pulverized coal into a closed microwave chemical reactor, reacting for 2-5min at 150-200 ℃, centrifugally separating and drying the pulverized coal to obtain the modified pulverized coal of the carbon nano tube doped with boron, and naming the modified pulverized coal as B-CNTs/pulverized coal;
s2, adding 2-5g of ammonium perrhenate, 2-4g of ammonium molybdate, 3-5g of sodium thiosulfate and 5-8g of thiourea into 200ml of deionized water, stirring uniformly, transferring into a stainless steel reaction kettle, heating to 250-300 ℃,heating for 18-24h, cooling to room temperature after the reaction is completed, centrifuging, and drying to obtain (Re/Mo) S with two-dimensional lamellar structure 2 ；
S3, 780-850g of cement, 750-880g of river sand, 40-70g of silica fume, 50-70g of mineral powder, 10-25g of polycarboxylate water reducer, 1-3g of polyoxypropylene ethylene oxide glycerol ether, 0.1-0.6g of plastic expanding agent, 10-25g of UEA expanding agent, 4-6g of sodium dodecyl sulfate, 8-15g of calcium formate, 0.2-0.8g of CsOH, 45-55g of B-CNTs/fly ash prepared in the step S1 and 10-15g of two-dimensional lamellar (Re/Mo) S prepared in the step S2 2 Pouring the mixture into a JJ-5 planetary cement mortar stirring pot, firstly dry-stirring the mixture for 3-5min, then slowly adding 180-320g of water, adjusting the mixture to be stirred slowly for 5min, stopping stirring for 40s, rapidly stirring for 8min to ensure that the grouting material has good fluidity, filling the grouting material into a mortar test mold with the thickness of 40mm multiplied by 160mm after stirring, standing and curing in a greenhouse for 20h, removing the mold, and then placing the mold in a standard curing box, wherein the curing temperature is 20+/-1 ℃ and the humidity is 99%, thus obtaining the high-performance steel bar sleeve grouting material.
2. The high performance steel sleeve grouting material of claim 1, wherein: the coal ash powder selected in the step S1 is 35g.
3. A high performance reinforcing bar sleeve grouting material as claimed in claim 1 or 2, wherein: 130ml of pyrrole and 75ml of N-methyl-2-pyrrolidone are optionally added in step S1.
4. A high performance steel sleeve grouting material according to claim 3, wherein: in the step S1, 25mL of 2M NaBH is added 4 。
5. The high performance steel sleeve grouting material of claim 1, wherein: in step S2, 2g of ammonium perrhenate and 3g of ammonium molybdate are added.
6. The high performance steel sleeve grouting material of claim 5, wherein: in step S2, 2g of sodium thiosulfate and 3g of thiourea were added.
7. The high performance steel sleeve grouting material of claim 5 or 6, wherein: the heating temperature in the step S2 is 280 ℃, and the heating time is 21h.
8. The high performance steel sleeve grouting material of claim 1, wherein: in the step S3, 780g cement, 750g river sand, 40g silica fume, 50g mineral powder, 10g polycarboxylate water reducer, 1g polyoxypropylene ethylene oxide glycerol ether, 0.1g plastic expanding agent, 10g UEA expanding agent, 4g sodium dodecyl sulfate, 8g calcium formate, 0.2g CsOH, 45g B-CNTs/fly ash prepared in the step S1 and 10g two-dimensional lamellar (Re/Mo) S prepared in the step S2 2 Pouring the mixture into a JJ-5 planetary cement mortar stirring pot.
9. The high performance steel sleeve grouting material of claim 1, wherein: the step S3 is added with the B-CNTs/fly ash prepared in the step S1 of 50g and the two-dimensional lamellar (Re/Mo) S prepared in the step S2 of 12g 2 。
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| CN107445542A (en) * | 2017-08-02 | 2017-12-08 | 美好建设有限公司 | A kind of cement base high-strength grout and its application in assembled architecture field |
| CN110950616A (en) * | 2019-12-17 | 2020-04-03 | 北京市市政工程研究院 | Grouting material for low-temperature steel bar sleeve connection and preparation method and application thereof |
| CN111439981A (en) * | 2020-04-03 | 2020-07-24 | 中建材中岩科技有限公司 | Low-temperature sleeve grouting material for connecting steel bars and application method thereof |
| CN113620666A (en) * | 2021-09-07 | 2021-11-09 | 苏州东木轩装饰材料有限公司 | Anti-cracking building material and preparation method thereof |
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| CN107445542A (en) * | 2017-08-02 | 2017-12-08 | 美好建设有限公司 | A kind of cement base high-strength grout and its application in assembled architecture field |
| CN110950616A (en) * | 2019-12-17 | 2020-04-03 | 北京市市政工程研究院 | Grouting material for low-temperature steel bar sleeve connection and preparation method and application thereof |
| CN111439981A (en) * | 2020-04-03 | 2020-07-24 | 中建材中岩科技有限公司 | Low-temperature sleeve grouting material for connecting steel bars and application method thereof |
| CN113620666A (en) * | 2021-09-07 | 2021-11-09 | 苏州东木轩装饰材料有限公司 | Anti-cracking building material and preparation method thereof |
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