CN113480247B - Heat insulation concrete and preparation method thereof - Google Patents
Heat insulation concrete and preparation method thereof Download PDFInfo
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- CN113480247B CN113480247B CN202110822266.4A CN202110822266A CN113480247B CN 113480247 B CN113480247 B CN 113480247B CN 202110822266 A CN202110822266 A CN 202110822266A CN 113480247 B CN113480247 B CN 113480247B
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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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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 application relates to the field of functional concrete, and particularly discloses heat insulation concrete and a preparation method thereof. The heat insulation concrete comprises the following substances in parts by weight: 60-80 parts of aggregate, 20-30 parts of admixture, 20-40 parts of cement, 50-60 parts of water and 10-15 parts of enhancer, wherein the admixture comprises sulfur fixation ash, and the enhancer comprises sodium hydroxide; the preparation method comprises the following steps: s1, preparing a reinforced admixture; s2, preparing hardening liquid; s3, coating a hardening layer: pressurizing the reinforced admixture prepared in the step S1 and the hardening liquid prepared in the step S2 to prepare an admixture coated with a hardening layer; and S4, preparing concrete. The concrete can be used in the fields of house construction, municipal construction and the like, and has the advantages of long-acting and stable heat insulation effect.
Description
Technical Field
The application relates to the field of functional concrete, in particular to heat insulation concrete and a preparation method thereof.
Background
The concrete is widely applied to the field of buildings due to the characteristics of wide raw material sources and simple production process. In recent years, energy-saving heat preservation is gradually the subject of the building market, so that the preparation of concrete with heat preservation performance is gradually a focus of attention. The heat preservation concrete mainly comprises aerated concrete, foam concrete, foamed concrete and the like.
According to the foam concrete, the foaming agent is mixed into the cementing material, so that a large number of pores are formed in the concrete, a heat exchange medium is reduced, the heat conduction coefficient of the concrete is reduced, and the heat insulation effect of the concrete is improved. However, because the foam is introduced into the concrete, and a large number of pores are formed in the concrete, the overall strength of the concrete is reduced, and the lightweight concrete is formed.
In view of the above-mentioned related technologies, the inventors believe that the introduction of pores in the concrete through mechanical stirring leads to poor bonding performance between the components in the concrete, and further the retention rate of the closed pores in the hydration process of the concrete is poor, thereby causing the defect of poor stability of the heat insulation effect of the concrete.
Disclosure of Invention
In order to improve the defect that the stability of the concrete heat insulation effect is not good, the application provides a heat insulation concrete and a preparation method thereof, and the following technical scheme is adopted:
in a first aspect, the present application provides a thermal insulation concrete, which adopts the following technical scheme:
the heat insulation concrete comprises the following substances in parts by weight: 60-80 parts of aggregate, 20-30 parts of admixture, 20-40 parts of cement, 50-60 parts of water and 10-15 parts of enhancer, wherein the admixture comprises sulfur fixation ash, and the enhancer comprises sodium hydroxide.
By adopting the technical scheme, firstly, as the sulfur-fixing ash is adopted as the admixture, a large number of pores are introduced into the concrete, the path of heat conduction in the concrete is greatly prolonged, and meanwhile, the heat conductivity coefficient of the concrete is reduced, so that the heat insulation effect of the concrete is improved; secondly, due to the irregular shape of the sulfur fixation ash, more pores can be formed after the sulfur fixation ash is mixed with concrete, and the heat conduction path is further prolonged. In addition, the sulfur-fixing ash is waste generated between the sulfur-fixing agent and the combustion coal in the coal-fired fluidized bed, so the sulfur-fixing ash is added into the concrete as an admixture, the problem of long-time waste accumulation of the sulfur-fixing ash is solved, and the energy conservation and the environmental protection are realized.
In addition, through the introduction of sodium hydroxide, the solid sulfur ash is excited by the sodium hydroxide, so that aluminum-oxygen/silicon-oxygen bonds in the solid sulfur ash are rearranged, and the original 'dissolution-combination-crystallization' process of the solid sulfur ash is destroyed to form hydrated gel. Because the hydrated gel is in a three-dimensional network structure, the bonding effect between the sulfur fixation ash and the concrete is improved, namely the strength of the concrete is improved, so that the maintenance degree of pores in the sulfur fixation ash is ensured, and the heat insulation effect of the concrete is ensured, therefore, the concrete obtains a durable and stable heat insulation effect.
Preferably, the admixture further comprises silica aerogel powder, and the mass ratio of the sulfur fixation ash to the silica aerogel powder is 10: 1-10.
By adopting the technical scheme, because the silicon dioxide aerogel powder has uniformly distributed and compact pores, the silicon dioxide aerogel powder and the solid sulfur ash are mixed and added into the concrete, so that the pores formed in the concrete are relatively uniform, and the concrete obtains a uniform heat insulation effect.
Meanwhile, the silicon dioxide aerogel powder can be adsorbed on the surface of the sulfur fixation ash, and when mechanical pores are formed in the irregular shape of the sulfur fixation ash and the concrete, the silicon dioxide aerogel powder can fill the mechanical pores, so that the strength of the concrete is improved, and the mechanical pores are replaced by the uniform and compact pores, so that the heat insulation effect of the concrete is further improved.
Preferably, the enhancer further comprises one or two of sodium carbonate or sodium silicate, and the mass ratio of the sodium hydroxide to the sodium carbonate to the sodium silicate is 1: 0-1: 0-1.
By adopting the technical scheme, the solid sulfur ash is excited by compounding the sodium carbonate and the sodium hydroxide, and the dissolution of the volcanic ash component in the solid sulfur ash is controlled, so that the hydrated gel forms a uniform three-dimensional network structure, the dissolution rate of the volcanic ash active component is reduced, and the possibility of agglomeration of the hydrated gel is reduced.
The sulfur fixation ash is excited by compounding the sodium hydroxide and the sodium silicate, and the sodium silicate provides silicon ions for hydrated gel, so that the silicon ions and the dissolved volcanic ash active component are quickly compounded, and the possibility of agglomeration of the hydrated gel is reduced.
The sodium hydroxide, the sodium carbonate and the sodium silicate are compounded to excite the solid sulfur ash, so that the hydrated gel is uniformly and uniformly generated, the harmful expansion of the hydrated gel is inhibited, the possibility of generating cracks in the hydration reaction process of the concrete is reduced, and the strength of the generated hydrated gel is ensured.
Through adjusting the ratio between sodium hydroxide, sodium carbonate and the sodium silicate three for the excitation speed of the inside active material of solid sulphur ash is comparatively even, and then the speed of producing cementitious substance through the volcanic ash reaction is comparatively suitable, and then the intensity of the hydrated gel of guarantee formation, and the effect of guarantee through solid sulphur ash increase concrete intensity is stable promptly.
Preferably, the admixture is coated with a hardening layer, the thickness of the hardening layer is 10-20mm, and the hardening layer comprises a brucite layer.
By adopting the technical scheme, as the brucite has better strength, the admixture is soaked in the brucite solution, so that the brucite is coated on the admixture, and then a hardened layer is formed on the surface of the admixture, the hardness of the admixture is improved, and the stability of the pore introduced by the admixture into the concrete is further ensured.
Meanwhile, as more pores are formed in the admixture, and further, in the process of coating the admixture by brucite, the inner walls of the pores of the admixture are coated synchronously, the strength of the pores is improved, and the stability of the pores is further enhanced, so that the prepared concrete obtains a stable and long-acting heat insulation effect.
In addition, through the thickness on control sclerosis layer, not only make sclerosis layer can even cladding outside solid sulphur ash, simultaneously, the sclerosis layer is difficult for causing because of the excess thickness collapses, drops, blocks up solid sulphur ash hole, and then influences the effect that the concrete passes through solid sulphur ash hole extension heat conduction path, and the guarantee concrete is thermal-insulated and keeps warm the effect stable.
Preferably, the particle size of the brucite is 2000-3000 meshes.
Through adopting above-mentioned technical scheme, on the one hand for the dispersion effect of brucite in brucite solution is preferred, and the even cladding of brucite is on the admixture, and on the other hand, the in-process of brucite cladding admixture, the hole inner wall that brucite easily got into the admixture is and is wrapped the hole inner wall, further increases the intensity of hole inner wall, and the stability in guarantee hole ensures the thermal-insulated heat preservation effect of concrete promptly.
Preferably, the brucite is modified brucite, and the modification treatment comprises the following steps: (1) preparing a modifying solution: respectively weighing a silane coupling agent and acrylic resin, wherein the mass ratio of the silane coupling agent to the acrylic resin is 1: 1-2, stirring and mixing to prepare a modified liquid; (2) the brucite and the modified solution are stirred and mixed to prepare the modified brucite.
Through adopting above-mentioned technical scheme, at first, adopt silane coupling agent to wrap brucite for active ingredient in the brucite gathers on the brucite surface, and then has increased the surface adhesion effect of brucite and the combination effect between brucite and the solid sulphur ash, makes the cladding of brucite to the admixture stable, has improved the stability in the hole in the concrete.
And meanwhile, after the acrylic resin is crosslinked with the silane coupling agent, the interface bonding effect of the brucite is further enhanced, the bonding strength of the brucite and the admixture is improved, and the stability of the pores of the admixture is ensured.
In addition, the proportion of the silane coupling agent and the acrylic resin is adjusted, so that the crosslinking degree of the silane coupling agent and the acrylic resin is controlled, on one hand, the water dispersion effect of the acrylic resin is guaranteed, namely, the dispersion effect of the brucite in the modification liquid is guaranteed, the brucite can uniformly coat the solid sulfur ash, on the other hand, the interface bonding effect of the brucite is guaranteed, the combination between the brucite and the solid sulfur ash is stable, and the strength of the solid sulfur ash is stably enhanced.
In a second aspect, the application provides a preparation method of heat insulation concrete, which adopts the following technical scheme:
a preparation method of heat insulation concrete comprises the following steps: s1, preparing reinforced admixture: mixing the admixture, the enhancer and water in the formula, and stirring and mixing to obtain a reinforced admixture; s2, preparing hardening liquid: taking brucite and the modified solution, and stirring and mixing to prepare a hardening solution; s3, coating a hardening layer: pressurizing the reinforced admixture prepared in the step S1 and the hardening liquid prepared in the step S2, and stirring and mixing to prepare an admixture coated with a hardening layer; s4, preparing concrete: and (4) taking the aggregate in the formula, the admixture coated with the hardening layer in the step S3, cement and water, and stirring and mixing to obtain the concrete.
Through adopting above-mentioned technical scheme, adopt the admixture that adds the sclerosis of cladding with brucite in the concrete, because the admixture has more hole, and then introduce a large amount of holes in making the concrete, prolonged the route that the heat passes through the concrete, reduced the coefficient of heat conductivity of concrete to the thermal-insulated heat preservation effect of concrete has been improved. Through the mode of pressurization treatment, the coating effect of brucite on admixture is further improved, and the stability of pores is guaranteed, namely the heat insulation effect of concrete is guaranteed.
Preferably, the pressure of the pressurization treatment in step S3 is 0.5 to 0.7 MPa.
By adopting the technical scheme, under appropriate pressure, the brucite coating admixture has a good effect, the brucite has a good dispersion effect in the modification liquid, and stable coating of the admixture by the brucite in the modification liquid is guaranteed.
In summary, the present application has the following beneficial effects:
1. because the sulfur fixation ash is added into the concrete, and the sulfur fixation ash has an irregular shape and more loose pores, a large number of pores are introduced into the concrete, the path of heat passing through the concrete is prolonged, the heat conductivity coefficient of the concrete is reduced, and the concrete obtains better heat insulation effect; meanwhile, the solid sulfur ash is reinforced by the sodium hydroxide, so that the components in the solid sulfur ash are rearranged to form hydrated gel, the hydrated gel is of a three-dimensional network structure, the combination effect of the solid sulfur ash and the concrete is improved, namely, the strength of the concrete is improved, the possibility of pore collapse in the concrete is reduced, and the concrete obtains a long-acting and stable heat insulation effect.
2. The preferred adoption is in the application to the outer cladding modified treatment's of admixture brucite, because brucite has the hardness of preferred, through the dispersion effect preferred of modified treatment's brucite in the modification liquid, make brucite stable cladding to the admixture, the inside and outside even cladding of guarantee admixture has the sclerosis layer, not only increase admixture self hardness, still improved the hardness of hole inner wall, thereby add the admixture to the concrete in the back, make the hole in the concrete remain stable, consequently, the concrete that makes has obtained the hardness of preferred and thermal-insulated heat preservation effect.
3. According to the method, the admixture with more pores is added into the concrete, more pores are introduced into the concrete, the heat conductivity coefficient of the concrete is reduced, and the path of heat passing through the concrete is prolonged, so that the concrete obtains a better heat insulation effect.
Detailed Description
The present application will be described in further detail with reference to examples.
In the embodiment of the present application, the selected apparatuses are as follows, but not limited thereto:
the instrument comprises the following steps: DRH-300 model thermal conductivity tester of Changzhou Dedu precision instruments, YES-2000 model concrete compressive strength tester of Shandong Jian force testing technology, Inc., DA-20F model mixer of Kunzshan Desvey precision machinery, Inc., and DHG-9078A model drying box of Shanghai Heheng instruments, Inc.
Medicine preparation: KH560 silane coupling agent with the product number of 223-1 from Henan Yongjia chemical products Limited, silicon dioxide aerogel powder with the product number of 908633 from Henan Tian rem chemical products Limited, and polycarboxylic acid water reducer A-248 from Shenzhen Dayang New materials Limited.
Preparation examples
Preparation example of enhancer
Preparation examples 1 to 6
Taking sodium hydroxide, sodium carbonate, sodium silicate and water to prepare 1-6 reinforcers. The specific mass of sodium hydroxide, sodium carbonate and sodium silicate is shown in the following table.
TABLE 1 preparative examples 1-6 enhancer components
Preparation example of modified solution
Preparation example 7
A silane coupling agent was taken as a modification liquid 1.
Preparation example 8
5kg of silane coupling agent, 5kg of polypropylene resin and 5kg of ethanol are taken, stirred and mixed to prepare a modified solution 2.
Preparation example 9
5kg of silane coupling agent, 10kg of polypropylene resin and 5kg of ethanol are taken, stirred and mixed to prepare modified liquid 2.
Examples of preparation of admixtures
Preparation example 10
Taking the sulfur fixation ash as admixture 1.
Preparation examples 11 to 13
1kg, 5kg and 10kg of silicon dioxide aerogel powder and 10kg of sulfur-fixing ash are respectively weighed, stirred and mixed to prepare admixture 2-4.
Examples
Examples 1 to 4
Aggregate, admixture 1, cement, water, a reinforcing agent and a water reducing agent are respectively weighed, and the specific mass is shown in Table 2.
Table 2 concrete compositions in examples 1-4
Preparing a reinforced admixture: and (3) stirring and mixing the weighed admixture 1 and the enhancer 1, stirring at a constant speed of 200r/min for 5min, filtering, retaining a filter cake, flushing the filter cake with deionized water until a washing liquid is neutral, and drying to obtain the reinforced admixture 1.
Preparing a hardening coating solution: 10kg of brucite with the particle size of 2000 meshes is weighed, the brucite and ethanol are stirred and mixed, and the mixture is stirred for 5min at the rotating speed of 500r/min, so that the hardening coating liquid 1 is prepared.
Coating a hardening layer: and (3) taking the reinforced admixture 1 and the hardening coating liquid 1, stirring and mixing, and continuously stirring for 10min at the rotating speed of 200r/min under 0.5MPa to prepare the admixture 1 coated with the hardening layer, wherein the thickness of the hardening layer is adjusted to be 10 mm.
Preparing concrete: the aggregate, the cement, the water reducing agent and the admixture 1 coated with the hardened layer in the formula are taken according to the mass ratio of the table 2, and are stirred and mixed to prepare the concrete 1-4.
Examples 5 to 7
The difference from example 3 is that: admixtures 2 to 4 were used in place of admixture 1 in example 3 to prepare admixtures 2 to 4 coated with a hardened layer and further to prepare concretes 5 to 7, and the other preparation conditions and preparation environments were the same as in example 3.
Examples 8 to 12
The difference from example 5 is that: adopting 2-6 reinforcers to replace the reinforcer 1 in the example 5 to prepare 2-6 reinforced admixtures and 8-12 concrete, wherein the rest preparation conditions and preparation environment are the same as those in the example 5.
Examples 13 to 14
The difference from example 11 is that: modified liquid 2-3 was used instead of ethanol in example 11, and the mixture was stirred and mixed with brucite to prepare hardened coating liquid 2-3 and concrete 13-14, and the other preparation conditions and preparation environments were the same as those in example 11.
Examples 15 to 16
The difference from example 14 is that: the particle sizes of brucite were controlled to 2500 mesh and 3000 mesh, respectively, instead of brucite in example 14, to prepare hardened coating solutions 4 to 5 and concretes 15 to 16, and the other preparation conditions and preparation environments were the same as in example 13.
Examples 17 to 18
The difference from the embodiment 16 is that: the pressure of the pressurization treatment was controlled to 0.6MPa and 0.7MPa, respectively, 5 to 6 admixtures coated with a hardened layer were prepared, 17 to 18 concrete was prepared, and the other preparation conditions and preparation environments were the same as in example 16.
Examples 19 to 20
The difference from example 17 is that: the thickness of the hardened layer was adjusted to 15mm and 20mm, admixtures 7 to 8 coated with the hardened layer were prepared, concrete 19 to 20 was prepared, and the remaining preparation conditions and preparation environment were the same as in example 17.
Performance test
The prepared concrete is fully mixed and then is filled into a test mould, the concrete in the test mould is inserted and tamped and the surface is smoothed in the filling process, a plurality of samples 1 with the size of 300 multiplied by 30mm and a plurality of samples 2 with the size of 70 multiplied by 70mm are prepared, wherein the samples 1 are used for detecting the heat conductivity coefficient, and the samples 2 are used for detecting the strength of the concrete. And (3) curing the sample 1 and the sample 2 for 24 hours at the temperature of 20 +/-2 ℃, and placing the samples into a curing box for standard curing for 28 days.
(1) And (3) testing the heat conductivity coefficient: taking a sample 1, putting the sample into an oven, drying the sample to constant weight at the temperature of 95 ℃, and measuring the heat conductivity coefficient of the sample 1 according to GB/T10294;
(2) and (3) detecting the compressive strength: placing the sample 2 under a pressure resistance tester, continuously loading at a slow speed, and recording the pressure of initial cracking generated by the sample 2;
(3) and (3) detecting the heat insulation stability and durability: taking a sample 1, putting the sample into an oven, drying the sample to constant weight at the temperature of 95 ℃, standing the sample for 180d and 360d, and detecting the heat conductivity coefficient of the sample 1 according to GB/T10294.
Table 3 examples 1-18 performance testing
Comparative example
Comparative example 1
The difference from example 19 is that: concrete 21 was prepared by simply using the sulfur-fixing ash in place of the reinforcing admixture 7 in example 19, and the other preparation conditions and preparation environment were the same as those in example 19.
Comparative example 2
The difference from example 19 is that: concrete 22 was prepared by using silica aerogel powder alone in place of admixture 3 in example 19, and the other preparation conditions and preparation environments were the same as in example 19.
Comparative example 3
The difference from example 19 is that: concrete 23 was prepared by activating admixture 3 with sodium carbonate in place of admixture 3 in example 19, and the other preparation conditions and preparation environment were the same as in example 19.
Comparative example 4
The difference from example 19 is that: concrete 24 was prepared by modifying admixture 3 with only the modifying liquid in place of admixture 5 coated with the hardened layer in example 19, and the preparation conditions and preparation environment were the same as in example 19.
Comparative example 5
The difference from example 19 is that: concrete 25 was prepared by modifying admixture 3 using only an acrylic resin as a modifying liquid in place of admixture 5 coated with a hardened layer in example 19, and the other preparation conditions and preparation environment were the same as in example 19.
Performance test
The prepared concrete is fully mixed and then is filled into a test mould, the concrete in the test mould is inserted and tamped and the surface is smoothed in the filling process, a plurality of samples 1 with the size of 300 multiplied by 30mm and a plurality of samples 2 with the size of 70 multiplied by 70mm are prepared, wherein the samples 1 are used for detecting the heat conductivity coefficient, and the samples 2 are used for detecting the strength of the concrete. And (3) curing the sample 1 and the sample 2 for 24 hours at the temperature of 20 +/-2 ℃, and placing the samples into a curing box for standard curing for 28 days.
(1) And (3) testing the heat conductivity coefficient: taking a sample 1, putting the sample into an oven, drying the sample to constant weight at the temperature of 95 ℃, and measuring the heat conductivity coefficient of the sample 1 according to GB/T10294;
(2) and (3) detecting the compressive strength: placing the sample 2 under a pressure resistance tester, continuously loading at a slow speed, and recording the pressure of initial cracking generated by the sample 2;
(3) and (3) detecting the heat insulation stability and durability: taking a sample 1, putting the sample into an oven, drying the sample to constant weight at the temperature of 95 ℃, standing the sample for 180d and 360d, and detecting the heat conductivity coefficient of the sample 1 according to GB/T10294.
TABLE 4 comparative examples 1-5 Performance test
Comparing the properties of Table 3 and Table 4, it can be found that:
(1) a comparison of examples 1-3, example 4 and comparative example 1 shows that: in examples 1 to 3, the thermal conductivity of the concrete is decreased and the initial cracking pressure of the concrete is increased by adjusting the proportions of the components in the concrete, which indicates that the heat insulation and heat preservation performance and compressive strength of the concrete are effectively improved by adding the sulfur fixation ash strengthened by sodium hydroxide into the concrete.
The sulfur fixation ash has more loose and unevenly distributed pores, and is added into concrete to introduce more pores for the concrete, and the irregular shape of the sulfur fixation ash is easy to generate more pores after being mixed with the concrete, so that the number of the pores in the concrete is further increased, the path of heat passing through the concrete is increased, the heat conductivity coefficient of the concrete is reduced, and the heat insulation effect of the concrete is improved.
In addition, the solid sulfur ash is initiated by the sodium hydroxide, so that silicon ions and aluminum ions in the solid sulfur ash are rearranged to form hydrated gel with a three-dimensional network structure, the combination effect between the solid sulfur ash and the concrete is improved, the hardness of the solid sulfur ash is improved, and the compression resistance effect of the concrete is improved.
As can be seen from Table 3, the concrete prepared in example 3 has the lowest thermal conductivity and the best compressive strength, which indicates that the ratio of each component in the concrete is proper.
(2) A comparison of example 1, examples 5-7 and comparative example 2 shows that: the concrete prepared in examples 5-7 has a reduced thermal conductivity and an improved compressive strength, which indicates that the application of the admixture of the sulfur-fixing ash and the silica aerogel powder improves the heat insulation and heat preservation effects and compressive strength of the concrete.
The solid sulfur ash and the concrete form more mechanical pores, and the silica aerogel powder is loaded on the solid sulfur ash to fill the mechanical pores through the mixed doping of the silica aerogel powder and the solid sulfur ash, and the silica aerogel has more compact pores, so that the concrete around the solid sulfur ash is supported, more pores are introduced into the concrete again, the path of heat passing through the concrete is further prolonged, and the heat insulation effect of the concrete is improved.
As can be seen from Table 3, the concrete prepared in example 6 has the lowest thermal conductivity and the best compressive strength, which indicates that the ratio of the components in the concrete is proper.
Comparing example 6 with comparative example 1, it can be found that: the mixed sulfur fixation ash and the silica aerogel are added into the concrete, so that the strength and the heat insulation effect of the concrete can be effectively improved. The reason is that the silica aerogel has poor dispersion effect in concrete and is easy to agglomerate, so that the concrete has poor heat insulation effect and compressive strength.
(3) A comparison of example 1, examples 8-10 and comparative example 3 shows that: in the embodiments 8 to 10, sodium hydroxide, sodium carbonate and sodium silicate are selected to be compounded, so that the heat insulation and heat preservation effect and the compressive strength of the prepared concrete are improved, which indicates that the solid sulfur ash is excited by compounding the sodium hydroxide, the sodium carbonate and the sodium silicate, and after the sodium hydroxide is mixed with the solid sulfur ash, the active ingredients in the solid sulfur ash are excited to overflow, the overflow of the active ingredients by the sodium carbonate can be inhibited to a certain degree, so that the overflow rate of the active ingredients in the solid sulfur ash is proper, the rate of hydrated gel formed by the solid sulfur ash is proper, the possibility of agglomeration of the hydrated gel is reduced, the bonding effect between the solid sulfur ash and the concrete is ensured, and the strength of the concrete is ensured.
Secondly, after the sodium silicate, the strong sodium oxide and the sulfur fixation ash are mixed, the sodium silicate provides certain silicon ions to be crosslinked with active ingredients in the sulfur fixation ash, so that the hydrated gel is formed at a higher speed, and the uniform hydrated gel is formed. Through compounding of the sodium hydroxide, the sodium carbonate and the sodium silicate, on one hand, the overflow rate of active ingredients in the sulfur fixation ash is controlled, on the other hand, the number of silicon ions is increased, the formation of hydrated gel is cooperatively controlled, the hydrated gel is guaranteed to be uniform and not easy to agglomerate, and the combination effect between the concrete and the sulfur fixation ash is guaranteed.
From Table 3, it can be seen that the concrete prepared in example 10 has the lowest thermal conductivity and the best compressive strength, which indicates that the proportion of each component in the reinforcing agent is proper.
(4) A comparison with examples 10 to 12 shows that: the concrete compressive strength is improved by adjusting the proportion of each component in the enhancer, and the overflow rate of active ingredients in the solid sulfur ash is ensured by controlling the proportion of the sodium carbonate, so that the formation rate of hydrated gel is ensured, the harmful expansion of the solid sulfur ash is inhibited, and the compressive strength of the concrete is ensured. From Table 3, it can be seen that the concrete prepared in example 11 has the lowest thermal conductivity and the best compressive strength, which indicates that the proportion of each component in the reinforcing agent is proper.
(5) Combining example 1, examples 13-14 and comparative example 5, it can be found that: through carrying out modification treatment to brucite, the coefficient of heat conductivity of the concrete that makes is showing and is reducing, the compressive effect is showing and promotes, this application is through modifying brucite, make the active group in the brucite gather on the brucite surface, improve the combination effect between brucite and the solid sulphur ash, rethread acrylic resin and silane coupling agent are compound, on the one hand, introduce hydrophilic group and improve the dispersion effect of brucite in the hardening cladding liquid, on the other hand, further improve the interface combination effect on brucite surface, strengthen the combination effect between brucite and the solid sulphur ash, make the stable improvement of intensity of solid sulphur ash, the compressive strength of concrete has been improved, the thermal-insulated heat preservation effect of concrete has been improved simultaneously.
From table 3, it can be seen that the concrete prepared in example 14 has the lowest thermal conductivity and the best compressive strength, which indicates that the ratio of the components in the hardening coating liquid is appropriate.
(6) A comparison of example 1 with examples 15 to 16 shows that: through the particle size of adjustment brucite, make the thermal-insulated heat preservation effect and the compressive strength of concrete all promote, this is because brucite not only cladding outside solid sulphur ash, carry out the cladding to the inner wall in the inside hole of solid sulphur ash simultaneously, consequently suitable particle size, make brucite can get into the hole of silica fume and cladding evenly to the hole inner wall, thereby further improve the intensity of solid sulphur ash, improve the intensity of concrete, the maintenance effect preferred in hole simultaneously, make the concrete obtain long-term and stable thermal-insulated heat preservation effect. From Table 3, it can be seen that the concrete prepared in example 16 has the lowest thermal conductivity and the best compressive strength, indicating that the particle size of brucite is suitable.
(7) A comparison of example 1 and examples 17 to 18 shows that: through the pressure of adjustment pressurization for the thermal-insulated heat preservation effect and the compressive strength of concrete promote to some extent, this is because under suitable pressure, further increase the combination effect between brucite and the solid sulphur ash for brucite steady load is on solid sulphur ash, stably improves the intensity of solid sulphur ash, makes the intensity of concrete obtain stable promotion, obtains long-term and stable thermal-insulated heat preservation effect simultaneously. From Table 3, it can be seen that the concrete obtained in example 17 has the lowest thermal conductivity and the best compressive strength, indicating that the pressure is suitable.
(8) A comparison of example 1 and examples 19 to 20 shows that: through the thickness on adjustment sclerosis layer for the coefficient of thermal-insulated and the compressive strength of concrete promote to some extent, this explains the thickness on this application through control sclerosis layer, not only make the sclerosis layer can evenly cladding outside solid sulphur ash, stabilize the intensity of reinforcing solid sulphur ash, strengthen the intensity of concrete promptly, and simultaneously, it leads to the possibility of sclerosis layer to solid sulphur ash surface hole jam to have reduced the sclerosis layer is too thick, the guarantee increases the effect of the heat transfer route of concrete through the hole on the solid sulphur ash, the thermal-insulated heat preservation effect and the compressive strength of concrete have been improved.
As is clear from Table 3, the concrete produced in example 19 is excellent in heat insulating effect and compressive strength, and the thickness of the hardened layer is appropriate.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (6)
1. The heat insulation concrete is characterized by comprising the following substances in parts by weight: 60-80 parts of aggregate, 20-30 parts of admixture, 20-40 parts of cement, 50-60 parts of water and 10-15 parts of enhancer, wherein the admixture comprises sulfur fixation ash, and the enhancer comprises sodium hydroxide;
the admixture also comprises silicon dioxide aerogel powder, and the mass ratio of the sulfur fixation ash to the silicon dioxide aerogel powder is 10: 1-10;
the admixture is coated with a hardening layer, the thickness of the hardening layer is 10-20mm, and the hardening layer comprises a brucite layer.
2. The heat insulating concrete according to claim 1, wherein: the enhancer also comprises one or two of sodium carbonate and sodium silicate, and the mass ratio of the sodium hydroxide to the sodium carbonate to the sodium silicate is 1: 0-1: 0-1.
3. The heat insulating concrete according to claim 1, wherein: the particle size of the brucite is 2000-3000 meshes.
4. The heat insulating concrete according to claim 1, wherein: the brucite is modified brucite, and the modification treatment comprises the following steps:
(1) preparing a modifying solution: respectively weighing a silane coupling agent and acrylic resin, wherein the mass ratio of the silane coupling agent to the acrylic resin is 1: 1-2, stirring and mixing to prepare a modified liquid;
(2) the brucite and the modified solution are stirred and mixed to prepare the modified brucite.
5. The method for preparing the heat insulation concrete of claim 4, which is characterized by comprising the following steps:
s1, preparing reinforced admixture: mixing the admixture, the enhancer and water in the formula, and stirring and mixing to obtain a reinforced admixture;
s2, preparing hardening liquid: taking the brucite and the modified solution, and stirring and mixing to prepare a hardening solution;
s3, coating a hardening layer: pressurizing the reinforced admixture prepared in the step S1 and the hardening liquid prepared in the step S2, and stirring and mixing to prepare an admixture coated with a hardening layer;
s4, preparing concrete: and (4) taking the aggregate in the formula, the admixture coated with the hardening layer in the step S3, cement and water, and stirring and mixing to obtain the concrete.
6. The heat insulating concrete according to claim 5, wherein: the pressure of the pressurization treatment in the step S3 is 0.5-0.7 MPa.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140091167A (en) * | 2013-01-09 | 2014-07-21 | 한국남부발전 주식회사 | Concrete Admixture Using Fly Ash Produced by CFB Power Plants and Method for Preparing the Same |
| CN104774033A (en) * | 2015-04-08 | 2015-07-15 | 西南科技大学 | General purpose Portland cement based ultra-light physical foamed concrete |
| CN104909612A (en) * | 2015-06-09 | 2015-09-16 | 苏州云舒新材料科技有限公司 | Novel thermal-insulation heat-shielding composite material and preparation method thereof |
-
2021
- 2021-07-20 CN CN202110822266.4A patent/CN113480247B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140091167A (en) * | 2013-01-09 | 2014-07-21 | 한국남부발전 주식회사 | Concrete Admixture Using Fly Ash Produced by CFB Power Plants and Method for Preparing the Same |
| CN104774033A (en) * | 2015-04-08 | 2015-07-15 | 西南科技大学 | General purpose Portland cement based ultra-light physical foamed concrete |
| CN104909612A (en) * | 2015-06-09 | 2015-09-16 | 苏州云舒新材料科技有限公司 | Novel thermal-insulation heat-shielding composite material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| SiO2气凝胶保温砂浆的配比优化及微观分析;芮雅峰;《混凝土世界》;20180731;第83页 * |
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