CN112194415A - Multifunctional box culvert pipe gallery concrete and preparation method thereof - Google Patents
Multifunctional box culvert pipe gallery concrete and preparation method thereof Download PDFInfo
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- CN112194415A CN112194415A CN202011019117.6A CN202011019117A CN112194415A CN 112194415 A CN112194415 A CN 112194415A CN 202011019117 A CN202011019117 A CN 202011019117A CN 112194415 A CN112194415 A CN 112194415A
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses multifunctional box culvert pipe gallery concrete and a preparation method thereof, wherein the raw materials comprise, by weight, 20-25 parts of cement, 8-12 parts of sand material, 9-18 parts of aggregate, 5-8 parts of microbeads, 8-15 parts of fly ash, 12-18 parts of zeolite, 4-6 parts of water-based resin, 0.6-1.5 parts of expanding agent, 1-3 parts of composite fiber, 0.7-2 parts of water reducing agent component and 12-20 parts of total water. The self-compaction and self-maintenance concrete gallery structure can obviously improve the self-compaction and working performance of the concrete, has self-maintenance performance, and can effectively reduce vertical cracking of the large-volume and overlong thin-wall concrete gallery structure.
Description
Technical Field
The invention belongs to the field of concrete, and particularly relates to multifunctional box culvert pipe gallery concrete and a preparation method thereof.
Background
The utility tunnel is one of the important marks of modern novel city municipal infrastructure construction of present generation, possesses the requirement of overlength life. At the present stage, because the pipe gallery major structure is integrally cast and constructed by concrete, the overall performance and the service life of the pipe gallery are determined by the quality of the concrete used by the major structure, therefore, the high-performance pipe gallery construction needs the concrete to meet the compression resistance requirement, and simultaneously, the requirements of different structural objects are combined according to the change of construction environment and conditions, so that the performance requirements of self-compaction, self-maintenance, low hydration heat, low shrinkage, high plastic retention and high durability are met.
At present, Chinese patent CN110668750A discloses a special high-impermeability shrinkage-compensating concrete for urban underground comprehensive pipe galleries and a preparation method thereof, wherein the concrete is prepared from ore, microbeads, fly ash and nano mineral powder through synergistic action, so that the hydration heat of cement is reduced, cracks of the cement caused by volume change of physical and chemical reactions are inhibited, and the compactness, impermeability and erosion resistance of the concrete are improved.
Disclosure of Invention
The invention aims to provide the multifunctional box culvert pipe gallery concrete and the preparation method thereof, the multifunctional box culvert pipe gallery concrete can obviously improve the self-compaction and working performance of the concrete, has self-maintenance performance, and can effectively reduce the vertical cracking of a large-volume and ultra-long thin-wall concrete gallery body structure.
The technical scheme adopted by the invention is as follows:
the multifunctional box culvert pipe gallery concrete comprises, by weight, 20-25 parts of cement, 8-12 parts of sand, 9-18 parts of aggregate, 5-8 parts of microbeads, 8-15 parts of fly ash, 12-18 parts of zeolite, 4-6 parts of water-based resin, 0.6-1.5 parts of expanding agent, 1-3 parts of composite fibers, 0.7-2 parts of water reducing agent component and 12-20 parts of total water.
Further, the zeolite is natural zeolite or sodium aluminosilicate.
Further, acrylic resin is used as the aqueous resin.
Further, the composite fiber adopts a combination of two kinds of fibers.
Furthermore, the expanding agent is sodium or potassium sulphoaluminate.
The preparation method of the multifunctional box culvert pipe gallery concrete comprises the steps of stirring and mixing the cement, the micro-beads, the fly ash, the zeolite and the composite fibers uniformly, adding the water-based resin and the mixing water, stirring uniformly, adding the sand material, the aggregate and the water reducing agent, stirring and mixing uniformly.
The invention has the beneficial effects that:
the zeolite is used as a functional material, has good adsorption and ion conversion functions, is used as a thickening component, obtains viscous slurry in a system by absorbing water, improves the self-compaction performance of the slurry, is beneficial to construction and pouring, is also used as a water carrier and is uniformly dispersed in concrete, and in a curing stage, water is released in the hardening process of the concrete, is supplied for cement hydration water, prolongs the secondary hydration time, reduces the alkali content of the system, plays a role in internal curing and balancing capillary pressure, finally reduces self-shrinkage, reduces cracking and improves strength, and simultaneously can save water resources and save labor.
The low-doped water-based resin is introduced, has medium acid value and viscosity conditions, can achieve good cement dispersion and slurry wetting and water retention effects, has high-activity free groups, has hydrophilic groups such as-OH hydroxyl groups, -CONH2 amide groups or-O-ether bonds, can be better connected with a cement hydration product to form branched chains under alkaline conditions, can cover the surface of a cement stone just generated in the stirring stage, delays the hydration process of cement, and improves the connection strength of a cement transition interface; in the pouring stage, the good lubricating property can avoid the honeycomb pitted surface generated by excessive viscosity on the contact surface of the concrete and the template during demoulding, in the final setting and hardening stage, the dried latex particles can also effectively delay the generation of micro cracks around the former stage, so that a certain time guarantee is provided for the release of water and the generation of action of zeolite, and finally, in the concrete dry shrinkage and self-shrinkage stages, the latex particles inserted around the set cement can play a role in buffering, consume the stress energy and slow down the expansion of the cracks.
The composite fiber toughening concrete is toughened through the composite fiber combination effect, the best quality and the type collocation combination are obtained through different types and quality collocation experiments on the premise of meeting the requirements of strength, fluidity and slump, the fluidity, strength and the folding-pressing ratio of the concrete can be obviously improved by using the composite fiber through the synergistic effect of the fiber, meanwhile, the complex fiber connection structure can consume energy in crack propagation, the composite fiber can effectively improve the stress concentration phenomenon of the overlong thin-wall concrete gallery body structure in the vertical direction, so that part of energy is consumed instead of energy being concentrated on cracks during loading, and the toughness fiber can be connected with the nearby cement structure to block the crack propagation, so that the cracks can not be further propagated.
The invention adopts the expanding agent, can promote the hydration of the cement and accelerate the generation of the ettringite, thereby offsetting the shrinkage degree of early coagulation.
The self-compaction and self-maintenance concrete gallery structure can obviously improve the self-compaction and working performance of the concrete, has self-maintenance performance, and can effectively reduce vertical cracking of the large-volume and overlong thin-wall concrete gallery structure.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention provides multifunctional box culvert pipe gallery concrete which comprises, by weight, 20-25 parts of cement, 8-12 parts of sand, 9-18 parts of aggregate, 5-8 parts of microbeads, 8-15 parts of fly ash, 12-18 parts of zeolite, 4-6 parts of water-based resin, 0.6-1.5 parts of an expanding agent, 1-3 parts of composite fibers, 0.7-2 parts of a water reducing agent component and 12-20 parts of total water. The invention can obviously improve the self-compaction and working performance of the concrete, has self-maintenance performance at the same time, and can effectively reduce the vertical cracking of the large-volume and ultra-long thin-wall concrete gallery structure
The zeolite is used as a functional material and has good adsorption and ion conversion functions, on one hand, the zeolite is used as a thickening component, viscous slurry is obtained in a system through water absorption, the self-compaction performance of the slurry is improved, construction and pouring are facilitated, on the other hand, the zeolite is also used as a water carrier and is uniformly dispersed in concrete, water is released in the hardening process of the concrete in the maintenance stage, water for hydration of the water is supplied, the secondary hydration time is prolonged, the alkali content of the system is reduced, the functions of internal maintenance and capillary pressure balance are achieved, the purposes of finally reducing self-shrinkage, reducing cracking and improving strength are achieved, and meanwhile, water resources can be saved, and labor is saved.
The low-doping amount of water-based resin is introduced, the water-based resin has medium acid value and viscosity conditions, the water-based resin can achieve good cement dispersion, slurry wetting and water retention effects, meanwhile, the ultrafine resin latex particles have high-activity free groups, and the resin latex particles have-OH hydroxyl, -CONH2 amido or-O-ether bond hydrophilic groups, can be better crosslinked with a cement hydration product under an alkaline condition to generate branched chains, can cover the surface of a cement stone just generated in a stirring stage, delay the hydration process of cement, and improve the connection strength of a cement transition interface; in the pouring stage, the good lubricating property can avoid the honeycomb pitted surface generated by excessive viscosity on the contact surface of the concrete and the template during demoulding, in the final setting and hardening stage, the dried latex particles can also effectively delay the generation of micro cracks around the former stage, so that a certain time guarantee is provided for the release of water and the generation of action of zeolite, and finally, in the concrete dry shrinkage and self shrinkage stages, the latex particles inserted around the cement stone can play a role in buffering, consume the stress energy and slow down the expansion of the cracks.
Toughening is carried out through the composite fiber combination effect, on the premise of meeting the requirements of strength, fluidity and slump, the best quality and the type combination are obtained through different types and quality combination collocation experiments, the fiber synergistic effect is utilized, the fluidity, the strength and the folding-compression ratio of concrete can be obviously improved by adopting the composite fiber, meanwhile, the energy can be consumed in crack expansion by a complex fiber connection structure, the stress concentration phenomenon of an overlong thin-wall concrete gallery body structure in the vertical direction can be effectively improved by the composite fiber, so that part of the energy is consumed instead of being concentrated on cracks during loading, and secondly, the toughness fiber can be connected with a nearby cement structure to block the crack expansion, and the cracks can not be further expanded.
The expanding agent is adopted, so that the cement hydration can be promoted, the generation of ettringite is accelerated, and the shrinkage degree of early coagulation is offset.
The zeolite is preferably natural zeolite or sodium aluminosilicate, the aqueous resin is preferably acrylic resin, the composite fiber is preferably a combination of two fibers, and the expanding agent is preferably sodium sulphoaluminate or potassium sulphoaluminate.
Example one
A preparation method of multifunctional box culvert pipe gallery concrete comprises the following steps:
1. 25 parts of cement, 8 parts of microbeads, 12 parts of fly ash, 15 parts of natural zeolite, 2.3 parts of composite fibers (PVA: carbon fibers are 5: 5) and the like are unloaded from a raw material bin and conveyed to a hopper truck to be mixed and stirred for 45 s;
2. unloading 8 parts of sand material and 9 parts of aggregate according to the parts by weight into a mixing bin for mixing for later use;
3. weighing 9 parts of polycarboxylic acid mother liquor, 8 parts of slump retaining mother liquor, 3 parts of sodium citrate, 0.5 part of plastic retaining powder, 0.02 part of alkyl sulfonate air entraining agent, 0.03 part of polyether defoaming agent and 80 parts of mixing water in parts by weight, and uniformly stirring to obtain a water reducing agent component for later use;
4. opening a resin tank, pumping 4 parts of water-based resin into a water adding tank I according to the parts by weight, introducing 6 parts of mixing water to dilute uniformly, injecting the diluted uniformly-mixed water into a stirring kettle at a constant speed, starting stirring at 120r/min, introducing 2.4 parts of mixing water after the water in the water adding tank is completely discharged, washing the tank wall, and then continuously placing the tank wall into the stirring kettle for mixing and stirring, wherein the stirring time of the stirring kettle is 100 s;
5. and (3) injecting a water reducing agent accounting for 1.5 components of the total mass into the water adding tank II, uniformly mixing, injecting the mixture into the stirring kettle, stirring for 30s, pouring the sand-stone mixture into the stirring kettle during stirring, stirring for 45s at a constant speed of 120r/min, and then stirring for 105s at a high speed of 240r/min to obtain the concrete.
Example two
The multifunctional box culvert pipe gallery concrete and the preparation method thereof comprise the following steps:
1. discharging 22 parts of cement, 6 parts of microbeads, 13 parts of fly ash, 20 parts of natural zeolite, 2 parts of composite fibers (PVA: PP is 8: 2) and the like by a raw material bin, conveying the materials into a hopper car, and mixing and stirring the materials in a stirring kettle for 30 seconds;
2. unloading 10 parts of sand material and 11 parts of aggregate by weight into a mixing bin for mixing for later use;
3. weighing 12 parts of polycarboxylic acid mother liquor, 7 parts of slump retaining mother liquor, 2 parts of sodium citrate, 1 part of plastic retaining powder, 0.01 part of alkyl sulfonate air entraining agent, 0.02 part of polyether defoaming agent and 78 parts of mixing water in parts by weight, and uniformly stirring to obtain a water reducing agent component for later use;
4. opening a resin tank, pumping 6 parts of water-based resin into a water adding tank I according to the parts by weight, introducing 5 parts of mixing water to dilute uniformly, injecting the diluted uniformly-mixed water into a stirring kettle at a constant speed, starting stirring at 120r/min, introducing 3 parts of mixing water to wash the tank wall after the water in the water adding tank is completely discharged, and continuously placing the tank wall into the stirring kettle to mix and stir, wherein the stirring time of the stirring kettle is 90 s;
5. and (3) injecting a water reducing agent accounting for 2 components of the total mass into the water adding tank II, uniformly mixing, injecting the mixture into the stirring kettle, stirring for 25s, pouring the sand-stone mixture into the stirring kettle during stirring, uniformly stirring for 60s at a constant speed of 120r/min, and then stirring for 105s at a high speed of 240r/min to obtain the concrete.
EXAMPLE III
The multifunctional box culvert pipe gallery concrete and the preparation method thereof comprise the following steps:
1. 25 parts of cement, 5 parts of microbeads, 15 parts of fly ash, 12 parts of natural zeolite, 2 parts of composite fibers (PVA: PP is 8: 2) and the like are unloaded from a raw material bin, conveyed into a hopper car and mixed and stirred in a stirring kettle for 30 s;
2. discharging 9 parts of sand material and 14 parts of aggregate according to the parts by weight into a mixing bin for mixing for later use;
3. weighing 10 parts of polycarboxylic acid mother liquor, 8 parts of slump retaining mother liquor, 2 parts of sodium citrate, 1 part of plastic retaining powder, 0.02 part of alkyl sulfonate air entraining agent, 0.03 part of polyether defoaming agent and 79 parts of mixing water in parts by weight, and uniformly stirring to obtain a water reducing agent component for later use;
4. opening a resin tank, pumping 6 parts of water-based resin into a water adding tank I according to the parts by weight, introducing 10 parts of mixing water to dilute the resin uniformly, injecting the diluted resin into a stirring kettle at a constant speed, starting stirring at 120r/min, introducing 4.2 parts of mixing water to wash the tank wall after the water in the water adding tank is completely discharged, and continuously placing the tank wall into the stirring kettle to mix and stir, wherein the stirring time of the stirring kettle is 90 s;
5. and (3) injecting a water reducing agent accounting for 2 components of the total mass into the water adding tank II, uniformly mixing, injecting the mixture into the stirring kettle, stirring for 25s, pouring the sand-stone mixture into the stirring kettle during stirring, uniformly stirring for 60s at a constant speed of 120r/min, and then stirring for 105s at a high speed of 240r/min to obtain the concrete.
In the above three embodiments:
the selected cement is Jinglan brand P.O52.5 cement; the zeolite is prepared by crushing analcime, the specific gravity is 2.0, and the apparent porosity is 48 percent; the bulk density of the selected sand material is 1580kg/m3The fineness modulus is 2.5-3.0; the selected stone is limestone macadam with the continuous gradation of 5-31.5 of granularity, the crushing value of 7.0 percent and the apparent density of 2500-3(ii) a The selected aqueous resin is styrene-acrylic emulsion, the solid content is 0.31, the glass transition temperature is 5 ℃, and white emulsion is obtained; the selected specific surface area is 23000cm2In terms of/g, the activity index is 111%.
Performance detection
The compression strength and the height of a U-shaped instrument of examples 1-3 are detected according to the national standard GB/T50081-2002 standard for testing the mechanical properties of common concrete; a water seepage height method is adopted to carry out a water seepage resistance experiment according to the national standard GB/T50082-2009 test method standard for the long-term performance and the durability of common concrete, and the detection result is shown in table 1.
Table 1 results of performance testing of examples
As can be seen from the comparison of the data of the examples 1-3 and the conventional pipe gallery concrete, the multifunctional concrete has better physical properties at all ages; meanwhile, the concrete fluidity rising height test of the U-shaped instrument shows that the initial height and the 3h later height of the concrete can reach more than 320mm, which indicates that the self-compaction is excellent; after the improvement is carried out by adding the composite fiber and the water-based resin, the water seepage resistance and the shrinkage value of the concrete are obviously reduced.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (6)
1. The utility model provides a multi-functional box culvert piping lane concrete which characterized in that: the raw materials comprise, by weight, 20-25 parts of cement, 8-12 parts of sand, 9-18 parts of aggregate, 5-8 parts of microbeads, 8-15 parts of fly ash, 12-18 parts of zeolite, 4-6 parts of water-based resin, 0.6-1.5 parts of an expanding agent, 1-3 parts of composite fibers, 0.7-2 parts of a water reducing agent component and 12-20 parts of total water.
2. The multifunctional box culvert pipe gallery concrete of claim 1, wherein: the zeolite is natural zeolite or sodium aluminosilicate.
3. The multifunctional box culvert pipe gallery concrete of claim 1, wherein: the water-based resin adopts acrylic resin.
4. The multifunctional box culvert pipe gallery concrete of claim 1, wherein: the composite fiber adopts the combination of two fibers.
5. The multifunctional box culvert pipe gallery concrete of claim 1, wherein: the expanding agent is sodium or potassium sulphoaluminate.
6. A method for preparing the multifunctional box culvert pipe gallery concrete as claimed in any one of claims 1 to 5, which is characterized in that: the cement, the microbeads, the fly ash, the zeolite and the composite fibers are stirred and mixed uniformly, then the water-based resin and the mixing water are added and stirred uniformly, and finally the sand material, the aggregate and the water reducing agent are added and stirred and mixed uniformly.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943131A (en) * | 2021-10-13 | 2022-01-18 | 青岛青新建材有限公司 | Box culvert and preparation method thereof |
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