CN114853418A - High-strength concrete for CL heat preservation integration - Google Patents
High-strength concrete for CL heat preservation integration Download PDFInfo
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- CN114853418A CN114853418A CN202210485005.2A CN202210485005A CN114853418A CN 114853418 A CN114853418 A CN 114853418A CN 202210485005 A CN202210485005 A CN 202210485005A CN 114853418 A CN114853418 A CN 114853418A
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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
- C04B28/04—Portland cements
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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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Abstract
The invention discloses high-strength concrete for CL heat preservation integration, and relates to the technical field of concrete. The high-strength concrete for CL heat preservation integration comprises the components of a composite gel material, sand, gravel, a water reducing agent and water according to the single formula dosage. The high-strength concrete for CL heat preservation integration is characterized in that fly ash is processed to obtain composite fly ash, the composite fly ash is doped into the composite fly ash, the performance requirement of the concrete can be met, good economic benefit can be obtained, the composite fly ash is used as the doping material of the concrete mixture, the strength of the concrete can be greatly improved, and the high-strength requirement of the concrete in the CL heat preservation integration construction process is met.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to high-strength concrete for CL heat preservation integration.
Background
CL heat preservation integration is a novel composite reinforced concrete shear wall building system formed by integrating a permanent energy-saving technical measure into a wall body, wherein a heat preservation layer and stress steel bars of a shear wall are combined into a CL net frame plate to serve as a framework of the wall body, and concrete is poured on two sides of the CL net frame plate to play double roles of stress and heat preservation; the internal heat insulation board forms a unified stress whole with the concrete member through the steel wire meshes on the two sides, the hardware and the connecting rod pieces, so that the purpose of integrating the heat insulation and the building main body structure is achieved.
With the development of building energy-saving engineering in China, more than 95% of new construction projects currently adopt an enclosure structure heat-insulating system, and the external wall external heat-insulating technology is particularly widely applied in a plurality of heat-insulating systems. However, with the wide application of external thermal insulation technology and the lapse of time, the problems caused by the technology become more and more prominent. The mode of wearing the wadded jacket is easy to cause the problems of cracking, falling off, hollowing, dewing and water seepage of the outer wall heat-insulating layer, fire hazard of the outer heat-insulating layer and the like. At present, the CL building heat preservation and structure integration technology is adopted to effectively combine the heat preservation function with the structure maintenance function, and the CL building heat preservation and structure integration technology has the characteristics of good heat preservation performance, high fireproof standard, strong shock resistance, no use of clay products, quick construction progress, long service life of houses, capability of realizing the modernization of building industry, high cost performance and the like, thereby avoiding the maintenance and replacement of the external wall heat preservation engineering, and really realizing the dual purposes of saving resources, saving energy and reducing emission. CL keeps warm integratively and guarantees that inside and outside wall body can pour simultaneously through adopting the concrete separator to the degree of difficulty that the inside and outside wall body was pour simultaneously to the concrete has been solved. When concrete is poured, the existing CL heat preservation integration is generally realized by mixing concrete components, so that various performance indexes of the concrete meet the requirement of on-site pouring, and therefore, the strength of the concrete is very important in the CL heat preservation integration construction process.
At present, in concrete, the strength of concrete is mainly improved by adding fly ash, for example, chinese patent CN2014108531899 discloses a low shrinkage and low viscosity ultra-high strength concrete, in the technical scheme, the ultra-high strength concrete is composed of a gel material, machine-made sand, gravel, a water reducing agent and water, and microbeads selected in the gel material are full spherical ultrafine fly ash, and the microspheres have the characteristics of small particles, smooth and compact surface and high dispersion degree, can be uniformly dispersed in the concrete, and can fill gaps and capillary pore passages of the concrete, thereby compacting the concrete and enhancing the strength of the concrete. However, as the requirement of the construction industry on the strength of concrete is higher and higher, the strength of the concrete is enhanced only by compacting the concrete by using the fly ash, so that the requirement of the industry cannot be met; moreover, research shows that the fly ash is directly used in a concrete gel material, so that the concrete performance requirements of an inner wall body and an outer wall body are difficult to meet at the same time, especially the CL heat-insulating outer side concrete cannot meet the design strength requirement, the strength of the outer side shear wall concrete cannot meet the requirement, and a large amount of heat-insulating plates are exposed after the formwork is removed.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides high-strength concrete for CL heat preservation integration, which solves the problem that the strength of the concrete cannot meet the requirements of the industry only by using a way of compacting the concrete by fly ash along with the higher and higher requirements of the construction industry on the strength of the concrete; moreover, research finds that the fly ash is directly used in a concrete gel material, so that the concrete performance requirements of an inner wall body and an outer wall body are difficult to meet at the same time, and especially the CL heat-insulating outer side concrete cannot meet the design strength requirements, so that the strength of the outer side shear wall concrete cannot meet the requirements and the heat-insulating plate is exposed in a large amount after the formwork is removed.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a high strength concrete for CL integration that keeps warm which characterized in that: the high-strength concrete comprises the following components of a composite gel material, sand, gravel, a water reducing agent and water, and the dosage of each component of the concrete is as follows according to the single dosage: 355-560kg/m composite gel material 3 Sand 665- 3 810- 3 Water reducing agent 7.5-12.6kg/m 3 157-water (200 kg/m) 3 ；
The crushed stone is continuously graded by 5-30mm, wherein the crushed stone with the particle size of 5-10mm accounts for 30-40% of the total consumption of the crushed stone, the crushed stone with the particle size of 10-30mm accounts for 60-70% of the total consumption of the crushed stone, the crushed stone is at least one of natural stone and tailing ore, the crushing value of the crushed stone is less than or equal to 10.0%, the content of needle-shaped particles is less than or equal to 15%, the mud content is 1%, and the mud content is 0.5%;
the sand is at least one of natural sand and machine-made sand, and the grain composition is grade II medium sand;
the water reducing agent is an aliphatic high-efficiency water reducing agent, the mixing amount is 1-2%, and the water reducing rate is 15-25%;
the composite gel material comprises the following components in single-component dosage: cement 215-394kg/m 3 54-88kg/m of mineral powder 3 63-110kg/m of composite fly ash 3 The mineral powder is S95 granulated blast furnace slag powder, and the cement is at least one of P.O42.5 and P.O52.5;
the preparation of the composite fly ash adopts hydrothermal treatment, iron-nickel nanorods are anchored on the surface of the fly ash, and then hydrothermal growth is carried out to construct a nanocrystal layer on the surface of the fly ash, so as to obtain the composite fly ash, wherein the preparation method specifically comprises the following steps:
mixing and dissolving nickel salt and ferric salt in a mixed solvent of ethylene glycol and ultrapure water, adding anhydrous oxalic acid, mixing fly ash as a carrier in a high-pressure reaction kettle for hydrothermal reaction, and dispersing the obtained product in distilled water to form a dispersion liquid, wherein the temperature of the hydrothermal reaction is 150 ℃ plus 160 ℃, the heat preservation time is 12-15h, the nickel salt is nickel chloride hexahydrate, the ferric salt is anhydrous ferrous chloride, the fly ash is common II-grade fly ash, the fineness is less than or equal to 25.0%, the water demand is less than or equal to 105%, and the ignition loss is less than or equal to 8.0%;
uniformly mixing the dispersion liquid and zinc oxide sol in proportion for later use, uniformly mixing zinc salt and hexamethylenetetramine, adding the standby solution, heating to react, washing and drying to obtain the composite fly ash, wherein the temperature of the heating reaction is 85-95 ℃, and the reaction time is 3-7h, and the zinc salt is zinc nitrate hexahydrate.
(III) advantageous effects
The invention provides high-strength concrete for CL heat preservation integration. The method has the following beneficial effects:
the high-strength concrete for CL heat preservation integration is characterized in that fly ash is processed to obtain composite fly ash, the composite fly ash is doped into the composite fly ash, the performance requirement of the concrete can be met, good economic benefit can be obtained, the composite fly ash is used as the doping material of the concrete mixture, the strength of the concrete can be greatly improved, and the high-strength requirement of the concrete in the CL heat preservation integration construction process is met.
Drawings
FIG. 1 is a schematic diagram showing the results of testing the mixing ratio and the working performance of C40 concrete according to the present invention;
FIG. 2 is a schematic diagram showing the test results of the mechanical properties of the concrete of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a high strength concrete for CL integration that keeps warm which characterized in that: the high-strength concrete comprises the following components of a composite gel material, sand, gravel, a water reducing agent and water, and the dosage of each component of the concrete is as follows according to the single dosage: 355-560kg/m composite gel material 3 Sand 665- 3 810- 3 Water reducing agent 7.5-12.6kg/m 3 157-water (200 kg/m) 3 ；
The crushed stone is continuously graded crushed stone with the particle size of 5-30mm, wherein the crushed stone with the particle size of 5-10mm accounts for 30-40% of the total amount of the crushed stone, the crushed stone with the particle size of 10-30mm accounts for 60-70% of the total amount of the crushed stone, the crushed stone is at least one of natural stone and tailing ore, the crushing value of the crushed stone is less than or equal to 10.0%, the content of needle-shaped particles is less than or equal to 15%, the mud content is 1%, and the mud block content is 0.5%;
the sand is at least one of natural sand and machine-made sand, and the grain composition is grade II medium sand;
the water reducing agent is an aliphatic high-efficiency water reducing agent, the mixing amount is 1-2%, and the water reducing rate is 15-25%;
the composite gel material comprises the following components in single-component dosage: cement 215- 3 54-88kg/m of mineral powder 3 63-110kg/m of composite fly ash 3 The mineral powder is S95 granulated blast furnace slag powder, and the cement is at least one of P.O42.5 and P.O52.5;
the preparation of the composite fly ash adopts hydrothermal treatment, iron-nickel nanorods are anchored on the surface of the fly ash, and then hydrothermal growth is carried out to construct a nanocrystal layer on the surface of the fly ash, so as to obtain the composite fly ash, wherein the preparation method specifically comprises the following steps:
mixing and dissolving nickel salt and ferric salt in a mixed solvent of ethylene glycol and ultrapure water, adding anhydrous oxalic acid, mixing fly ash as a carrier in a high-pressure reaction kettle for hydrothermal reaction, and dispersing the obtained product in distilled water to form a dispersion liquid, wherein the temperature of the hydrothermal reaction is 150 ℃ plus 160 ℃, the heat preservation time is 12-15h, the nickel salt is nickel chloride hexahydrate, the ferric salt is anhydrous ferrous chloride, the fly ash is common II-grade fly ash, the fineness is less than or equal to 25.0%, the water demand is less than or equal to 105%, and the ignition loss is less than or equal to 8.0%;
uniformly mixing the dispersion liquid and zinc oxide sol in proportion for later use, uniformly mixing zinc salt and hexamethylenetetramine, adding the standby solution, heating to react, washing and drying to obtain the composite fly ash, wherein the temperature of the heating reaction is 85-95 ℃, and the reaction time is 3-7h, and the zinc salt is zinc nitrate hexahydrate.
Example 1
A high-strength concrete for CL heat preservation integration is according to folk prescription (m) 3 ) The concrete comprises the following components by weight: 349kg of cement, 77kg of mineral powder, 99kg of composite fly ash, 902kg of natural sand, 1023kg of natural stone macadam, 10.8kg of water reducing agent and 200kg of water, wherein 310kg of the total dosage of the macadam is taken from the macadam with the particle size of 5-10mm, and 713kg of the total dosage of the macadam is taken from the macadam with the particle size of 10-30 mm.
After the materials are completely prepared, the components are mixed and stirred in a forced mixer for 2min to obtain the high-strength concrete.
The construction method of the high-strength concrete comprises the following process operations: when the pump concrete is adopted, the concrete is firstly unloaded on the chute and then flows into the template, and the pouring speed of the concrete is controlled to be 15m 3 /h，Meanwhile, in the pouring process, the height difference of concrete on the inner side and the outer side of the insulation board is paid attention to in real time, when the height of the concrete in the formwork on one side of the protective layer is 400mm higher than that of the concrete on one side of the structural layer, the concrete pipeline leaves the chute, and the concrete enters the formwork on the other side of the structural layer.
Example 2
A high-strength concrete for CL heat preservation integration is according to folk prescription (m) 3 ) The concrete comprises the following components by weight: 334kg of cement, 73kg of mineral powder, 95kg of composite fly ash, 861kg of natural sand, 976kg of natural stone macadam, 10.4kg of water reducing agent and 191kg of water, wherein the macadam with the particle size of 5-10mm is 342kg of the total dosage of the macadam, and the macadam with the particle size of 10-30mm is 634kg of the total dosage of the macadam.
After the materials are completely prepared, the components are mixed and stirred in a forced mixer for 2min to obtain the high-strength concrete.
The construction method of the high-strength concrete comprises the following process operations: when the pump concrete is adopted, the concrete is firstly unloaded on the chute and then flows into the template, and the pouring speed of the concrete is controlled to be 16m 3 And h, simultaneously, in the pouring process, the height difference of the concrete on the inner side and the outer side of the insulation board is paid attention to in real time, and when the height of the concrete in the formwork on one side of the protective layer is 400mm higher than that of the concrete on one side of the structural layer, the concrete pipeline leaves the chute, so that the concrete enters the formwork on the other side of the structural layer.
Example 3
A high-strength concrete for CL heat preservation integration is according to folk prescription (m) 3 ) The concrete comprises the following components by weight: 318kg of cement, 70kg of mineral powder, 90kg of composite fly ash, 820kg of natural sand, 930kg of natural stone broken stone, 9.9kg of water reducing agent and 182kg of water, wherein 285kg of the total broken stone consumption is taken from broken stones with the particle size of 5-10mm, and 645kg of the total broken stone consumption is taken from broken stones with the particle size of 10-30 mm.
After the materials are completely prepared, the components are mixed and stirred in a forced mixer for 2min to obtain the high-strength concrete.
High strength as described in the present inventionThe concrete construction method comprises the following process operations: when the pump concrete is adopted, the concrete is firstly unloaded on the chute and then flows into the template, and the pouring speed of the concrete is controlled to be 17m 3 And h, simultaneously, in the pouring process, the height difference of the concrete on the inner side and the outer side of the insulation board is paid attention to in real time, and when the height of the concrete in the formwork on one side of the protective layer is 400mm higher than that of the concrete on one side of the structural layer, the concrete pipeline leaves the chute, so that the concrete enters the formwork on the other side of the structural layer.
Example 4
A high-strength concrete for CL heat preservation integration is according to folk prescription (m) 3 ) The concrete comprises the following components by weight: 302kg of cement, 67kg of mineral powder, 85kg of composite fly ash, 779kg of natural sand, 884kg of natural stone macadam, 9.4kg of water reducing agent and 173kg of water, wherein 310kg of the total dosage of the macadam is taken from the macadam with the particle size of 5-10mm, and 574kg of the total dosage of the macadam is taken from the macadam with the particle size of 10-30 mm.
After the materials are completely prepared, the components are mixed and stirred in a forced mixer for 2min to obtain the high-strength concrete.
The construction method of the high-strength concrete comprises the following process operations: when the pump concrete is adopted, the concrete is firstly unloaded on the chute and then flows into the template, and the pouring speed of the concrete is controlled to be 17m 3 And h, simultaneously, in the pouring process, the height difference of the concrete on the inner side and the outer side of the insulation board is paid attention to in real time, and when the height of the concrete in the formwork on one side of the protective layer is 400mm higher than that of the concrete on one side of the structural layer, the concrete pipeline leaves the chute, so that the concrete enters the formwork on the other side of the structural layer.
Example 5
A high-strength concrete for CL heat preservation integration is according to folk prescription (m) 3 ) The concrete comprises the following components by weight: 290kg of cement, 63kg of mineral powder, 81kg of composite fly ash, 738kg of machine-made sand, 837kg of tailing stone macadam, 9.1kg of water reducing agent and 165kg of water, wherein the macadam with the particle size of 5-10mm is 335kg of the total dosage of the macadam, and the macadam with the particle size of 10-30mm is 502kg of the total dosage of the macadam.
After the materials are completely prepared, the components are mixed and stirred in a forced mixer for 2min to obtain the high-strength concrete.
The construction method of the high-strength concrete comprises the following process operations: when the pump concrete is adopted, the concrete is firstly unloaded on the chute and then flows into the template, and the pouring speed of the concrete is controlled to be 18m 3 And h, simultaneously, in the pouring process, the height difference of the concrete on the inner side and the outer side of the insulation board is paid attention to in real time, and when the height of the concrete in the formwork on one side of the protective layer is 400mm higher than that of the concrete on one side of the structural layer, the concrete pipeline leaves the chute, so that the concrete enters the formwork on the other side of the structural layer.
Control group
A high-strength concrete for CL heat preservation integration is according to folk prescription (m) 3 ) The concrete comprises the following components by weight: 390kg of cement, 65kg of mineral powder, 105kg of common fly ash (II grade), 665kg of natural sand, 1065kg of natural stone macadam, 12.6kg of water reducing agent and 190kg of water, wherein 320kg of the total dosage of the macadam is taken from the macadam with the particle size of 5-10mm, and 745kg of the total dosage of the macadam is taken from the macadam with the particle size of 10-30 mm.
After the materials are completely prepared, the components are mixed and stirred in a forced mixer for 2min to obtain the high-strength concrete.
Test experiments
1.1 concrete Adaptation basis and Standard
In order to better exert the characteristics of the composite fly ash and reduce the manufacturing cost of the C40 concrete, the C40 concrete is subjected to trial-matching work according to the performance requirement of the C40 concrete (pumping), and the trial-matching basis and the reference standard are as follows:
(1) the slump of the formulated C40 concrete is about 240mm (easy to pump).
(2) The performance and mechanical property of the concrete mixture are tested according to GB/T50080-2002 Standard of Performance test methods of common concrete mixtures.
1.2 concrete test and working Properties
C40 concrete mix ratio and its working properties, see fig. 1;
according to the test results, the performance requirements of the C40 concrete can be met by adding the composite fly ash, and good economic benefits can be obtained.
In summary, the high-strength concrete for CL heat preservation integration is characterized in that fly ash is processed to obtain composite fly ash, the composite fly ash is doped into the composite fly ash, so that the performance requirement of the concrete can be met, and good economic benefit can be obtained.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The utility model provides a high strength concrete for CL integration that keeps warm which characterized in that: the high-strength concrete comprises the following components of a composite gel material, sand, gravel, a water reducing agent and water, and the dosage of each component of the concrete is as follows according to the single dosage: composite gel material 355-560kg/m 3 Sand 665- 3 810- 3 Water reducing agent 7.5-12.6kg/m 3 157-water (200 kg/m) 3 ；
The crushed stone is continuously graded by 5-30mm, wherein the crushed stone with the particle size of 5-10mm accounts for 30-40% of the total consumption of the crushed stone, the crushed stone with the particle size of 10-30mm accounts for 60-70% of the total consumption of the crushed stone, the crushed stone is at least one of natural stone and tailing ore, the crushing value of the crushed stone is less than or equal to 10.0%, the content of needle-shaped particles is less than or equal to 15%, the mud content is 1%, and the mud content is 0.5%;
the sand is at least one of natural sand and machine-made sand, and the grain composition is grade II medium sand;
the water reducing agent is an aliphatic high-efficiency water reducing agent, the mixing amount is 1-2%, and the water reducing rate is 15-25%;
the composite gel material comprises the following components in single-component dosage: cement 215- 3 54-88kg/m of mineral powder 3 63-110kg/m of composite fly ash 3 The mineral powder is S95 granulated blast furnace slag powder, and the cement is at least one of P.O42.5 and P.O52.5;
the preparation of the composite fly ash adopts hydrothermal treatment, iron-nickel nanorods are anchored on the surface of the fly ash, and then hydrothermal growth is carried out to construct a nanocrystal layer on the surface of the fly ash, so as to obtain the composite fly ash, wherein the preparation method specifically comprises the following steps:
mixing and dissolving nickel salt and ferric salt in a mixed solvent of ethylene glycol and ultrapure water, adding anhydrous oxalic acid, mixing fly ash as a carrier in a high-pressure reaction kettle for hydrothermal reaction, and dispersing the obtained product in distilled water to form a dispersion liquid, wherein the temperature of the hydrothermal reaction is 150 ℃ plus 160 ℃, the heat preservation time is 12-15h, the nickel salt is nickel chloride hexahydrate, the ferric salt is anhydrous ferrous chloride, the fly ash is common II-grade fly ash, the fineness is less than or equal to 25.0%, the water demand is less than or equal to 105%, and the ignition loss is less than or equal to 8.0%;
uniformly mixing the dispersion liquid and zinc oxide sol in proportion for later use, uniformly mixing zinc salt and hexamethylenetetramine, adding the standby solution, heating to react, washing and drying to obtain the composite fly ash, wherein the temperature of the heating reaction is 85-95 ℃, and the reaction time is 3-7h, and the zinc salt is zinc nitrate hexahydrate.
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