CN110426407B - Method for manufacturing and characterizing magnesium oxychloride cement foam concrete air hole structure model - Google Patents
Method for manufacturing and characterizing magnesium oxychloride cement foam concrete air hole structure model Download PDFInfo
- Publication number
- CN110426407B CN110426407B CN201811401967.5A CN201811401967A CN110426407B CN 110426407 B CN110426407 B CN 110426407B CN 201811401967 A CN201811401967 A CN 201811401967A CN 110426407 B CN110426407 B CN 110426407B
- Authority
- CN
- China
- Prior art keywords
- foam concrete
- plastic material
- magnesium oxychloride
- oxychloride cement
- cement foam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011381 foam concrete Substances 0.000 title claims abstract description 120
- 239000004568 cement Substances 0.000 title claims abstract description 100
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 67
- 239000004033 plastic Substances 0.000 claims abstract description 63
- 229920003023 plastic Polymers 0.000 claims abstract description 63
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 230000007062 hydrolysis Effects 0.000 claims abstract description 24
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000012512 characterization method Methods 0.000 claims abstract description 15
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 9
- 239000011148 porous material Substances 0.000 claims description 87
- 239000007788 liquid Substances 0.000 claims description 46
- 238000009826 distribution Methods 0.000 claims description 26
- 239000012188 paraffin wax Substances 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 229920005992 thermoplastic resin Polymers 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229920002492 poly(sulfone) Polymers 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920006324 polyoxymethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 239000005060 rubber Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- -1 polyethylene Polymers 0.000 claims 3
- 229930040373 Paraformaldehyde Natural products 0.000 claims 1
- 239000004721 Polyphenylene oxide Substances 0.000 claims 1
- 238000007689 inspection Methods 0.000 claims 1
- 229920006380 polyphenylene oxide Polymers 0.000 claims 1
- 229920002725 thermoplastic elastomer Polymers 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 18
- 238000013459 approach Methods 0.000 abstract description 2
- 238000011160 research Methods 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 6
- 239000004566 building material Substances 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 238000002791 soaking Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 238000005187 foaming Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000003703 image analysis method Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 229920013636 polyphenyl ether polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2202—Preparing specimens therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
- G01N23/2251—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident electron beams, e.g. scanning electron microscopy [SEM]
Landscapes
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Moulds, Cores, Or Mandrels (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
The invention discloses a method for manufacturing a magnesium oxychloride cement foam concrete air hole structure model based on a plastic material, which comprises the steps of flatly paving a plastic material which is heated and melted on the cross section of MOC foam concrete by utilizing the hydrolysis characteristic of MOC in water and the water resistance of the plastic material to form a plastic material-MOC foam concrete integral test piece; and hydrolyzing the plastic material-MOC foam concrete integral test piece, wherein the rest part is the magnesium oxychloride cement foam concrete air hole structure model. The obtained plastic material forms an intuitive model of the concrete internal hole structure, and various characteristic parameters of the hole are observed by using instruments such as a microscope, an SEM and the like, and the characterization method not only can more intuitively see the MOC foam concrete internal hole structure, but also can characterize various parameters of the MOC foam concrete internal hole. The method for testing different hole parameters by using one method is simple and easy to implement, and is a simplification of scientific research approaches.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a method for manufacturing and characterizing a magnesium oxychloride cement foam concrete air hole structure model based on a plastic material.
Background
The foam concrete is a light concrete material which is prepared by taking mineral admixture, cement-based material and the like as main gelled materials, adding water and additive, optionally adding fine sand or partial light aggregate and the like to prepare slurry, foaming by a foaming agent, pouring and forming in a construction site or a factory, and curing and contains a large amount of independent, tiny and uniformly distributed air bubble holes. Because the interior of the foam concrete is provided with a large number of closed bubble holes, the foam concrete not only has light weight and heat insulation performance, but also has' breathingThe suction function can improve the comfort of the living environment. The dry bulk density of the foam concrete is 200-700 kg/m3The concrete is equivalent to 1/10-1/3 of common cement concrete; the thermal conductivity is 0.050-0.135W/(m.k), and the thermal resistance is 20-30 times that of ordinary cement concrete. As an inorganic material, the foam concrete has incombustibility, the fireproof performance reaches the fireproof standard A level, and the foam concrete has good fireproof and fireproof performance. Compared with other inorganic heat-insulating materials (such as aluminum silicate fibers, rock mineral wool, glass wool, ceramsite, expanded perlite, vitrified micro bubbles and the like), the material has the advantages of low price, no environmental pollution, convenience in use, low carbon and the like, and gradually becomes the first choice in modern heat-insulating materials.
Magnesium Oxychloride Cement (Magnesium Oxychloride Cement abbreviated as MOC) is an air-hardening cementing material formed by mixing Magnesium chloride solution with certain concentration with Magnesium oxide powder, and the main hydration product is Magnesium Oxychloride [ Mg3(OH)5Cl·4H2O]And Mg (OH)2. General magnesium oxychloride [ Mg ]3(OH)5Cl·4H2O]It is easily hydrolyzed into magnesium hydroxide in water, and further, it shows characteristics of strength reduction and pulverization. The modifier is added to change magnesium oxychloride (Mg)3(OH)5Cl·4H2O]The crystal structure of (3) makes it denser and therefore less prone to hydrolysis. The magnesium oxychloride cement paste is mixed with a certain amount of foam (physical foaming or chemical foaming) to prepare the magnesium oxychloride cement foam concrete building block. The heat-insulating brick has the advantages of high strength, excellent heat-insulating property, high fire resistance, strong durability, easy maintenance and the like. Compared with the traditional building material, the novel magnesium building material has the characteristics of strong cohesive force, heat preservation, heat insulation and the like, thereby occupying an important position in the building energy-saving application technology. Particularly, the foam concrete building material taking the MOC as the base material can maximally realize the characteristics of energy conservation, environmental protection, economy and the like, and has great advantages in the field of building materials.
The foam concrete is characterized by a porous structure and is porous concrete. Currently, different pore structure characteristic parameters have different testing methods. The characterization of the MOC foam concrete pore structure mainly refers to a test method of common foam concrete, and the characteristic parameters mainly comprise porosity, pore size distribution, average pore size, pore distribution, shape factor, pore wall thickness and connectivity.
The porosity, the wall thickness and the connectivity are mainly measured by a direct calculation method, a medium soaking method and the like.
(1) At present, the methods for testing porosity, pore wall thickness and connectivity mainly comprise a direct calculation method, a medium soaking method and the like. If the porosity is expressed by the formula theta-1-M/V.rhosAnd (4) calculating. The direct calculation method comprises the following steps: the porosity adopts the formula theta as 1-M/V.rhosAnd (4) calculating. In the formula: m is the quality of the dried foam concrete; rhosThe density of the corresponding compact solid of the foam concrete is obtained; v is the volume of the foam concrete. Soaking the medium: first, the mass w of the object M to be measured is measured1Then immersing the sample in the liquid for a period of time to fully saturate, taking out and wiping off the liquid on the surface of the sample, and weighing the mass w of M in the air again2. Then the object M is placed on a sling and is immersed in the liquid to be weighed, and the total mass of M and the sling is w3And the mass of the hanger suspended in the working liquid is w4. The porosity adopts the formula theta-1-w1ρt/(w2-w3+w4)ρsCalculation, in the formula: rhotIs the density of the liquid; rhosThe density of the test piece corresponds to the density of the dense solid.
Although the method using calculation simulation can embody the specific parameters of the air holes in the concrete, the biggest disadvantage is that the real shape of the air holes in the concrete cannot be observed intuitively, and only one parameter can be calculated. For example, the porosity formula can only express the porosity in the concrete and cannot calculate the size of the air holes.
(2) At present, the method for testing the pore diameter, pore size distribution, average pore diameter, pore distribution, shape factor and the like mainly obtains a material section image by means of an imaging tool such as a microscope and the like, and then performs necessary processing on the section image to analyze and calculate pore structure parameters. The direct image analysis method needs to damage the test piece, can only obtain local information of the test piece, and has high requirement on selection of an observation point. The biggest disadvantage is that only a virtual picture of the foam concrete structure can be obtained, and the depth of the hole structure is not accurately displayed.
Through the analysis, the method can only reflect the parameters of one hole basically regardless of a calculation method or an image method, and the method can not reflect the real situation of the hole in the foam concrete visually.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and the water-insoluble plastic material (such as paraffin) is poured on the section of the magnesium oxychloride cement foam concrete by utilizing the hydrolysis characteristic of MOC in water, so that the plastic material forms an intuitive model of the inner hole structure of the MOC foam concrete. By combining with SEM and other instruments to observe various characteristic parameters of the holes, the characterization method not only can more intuitively see the internal hole structure of the magnesium oxychloride cement concrete, but also can characterize various parameters of the internal holes of the magnesium oxychloride cement foam concrete. The method for testing different hole parameters by using one method is simple and easy to implement, and is a simplification of scientific research approaches.
The invention is realized by the following technical scheme:
a method for manufacturing a magnesium oxychloride cement foam concrete air hole structure model based on a plastic material comprises the following steps:
heating and melting the plastic material into plastic material liquid, wherein the melting point of the plastic material is 50-200 ℃, and the plastic material liquid is insoluble in water;
fixing a circle of die around the cross section of the magnesium oxychloride cement foam concrete to be tested, and pouring the plastic material liquid into the die to form a plastic material-magnesium oxychloride cement foam concrete integral test piece;
and hydrolyzing the plastic material-magnesium oxychloride cement foam concrete integral test piece at the hydrolysis temperature of 0-30 ℃, and taking the complete hydrolysis of the magnesium oxychloride cement foam concrete to be tested as the hydrolysis end point, wherein the rest part is the magnesium oxychloride cement foam concrete air hole structure model.
In the technical scheme, the plastic material is paraffin, thermoplastic resin (PE-polyethylene, PP-polypropylene, PVC-polyvinyl chloride, PS-polystyrene, PA-polyamide, POM-polyformaldehyde, PC-polycarbonate, polyphenyl ether, polysulfone), rubber and the like;
before the plastic material liquid is poured into the mould, the method further comprises the following steps: and heating the magnesium oxychloride cement foam concrete to be detected. The plastic material liquid can be filled into the mold, the fluidity of the plastic material liquid is enhanced, and the phenomenon that the plastic material liquid is cooled and solidified too early to block the pore channel is avoided.
In the above technical scheme, still include after pouring into the mould with plasticity material liquid: and after the plastic material liquid is solidified into a stable solid, the time of the process of solidifying the plastic material liquid into the stable solid is 0.2-1 hour.
In the technical scheme, the time of the hydrolysis process is 3-28 days.
In the technical scheme, because the water-resistant MOC and MOC concrete are easy to separate out chloride ions in a water environment, and the chloride ions are easy to corrode iron products, the metal mould or the wood mould which is difficult to corrode such as a stainless steel mould and copper is preferably selected as the mould. The fixing mode of the mould is various, such as embedding, linking, buckling, bonding and the like.
A method for manufacturing a magnesium oxychloride cement foam concrete air hole structure model based on a plastic material comprises the following steps:
selecting representative magnesium oxychloride cement foam concrete, and cutting a section, wherein the section is kept clean and tidy;
heating and melting paraffin to form plastic material liquid;
fixing a circle of metal mold around the section, pouring the plastic material liquid into the mold, forming a plane on the surface of the poured plastic material liquid, enabling the plane to be horizontal to the upper surface of the metal mold, and forming a stable solid after the plastic material liquid is solidified for 25 minutes to form a paraffin-magnesium oxychloride cement foam concrete integral test piece;
and hydrolyzing the paraffin-magnesium oxychloride cement foam concrete integral test piece, wherein the hydrolysis temperature is 20-25 ℃, the hydrolysis process time is 7-14 days, and the residual paraffin part is the magnesium oxychloride cement foam concrete pore structure model.
The application of the magnesium oxychloride cement foam concrete pore structure model in the structural characterization of the porosity, pore size distribution, average pore size, pore distribution, shape factor, pore wall thickness or connectivity of the magnesium oxychloride cement foam concrete pores.
In the above technical solution, the characterizing includes at least one of observing with a microscope and detecting with a Scanning Electron Microscope (SEM).
The invention has the advantages and beneficial effects that:
the invention has the following advantages: the existing analysis method can only analyze a certain specific characteristic parameter in the foam concrete by one means, for example, only the porosity can be analyzed by a soaking medium method, and other characteristics such as the size of pores, the shape of the pores and the like cannot be displayed. The invention can visually observe various parameters of porosity, pore size distribution, average pore size, pore distribution, shape factor and the like of the pores.
Drawings
FIG. 1 is a schematic view of the MOC foam concrete to be tested in example 1;
FIG. 2 is a schematic diagram of MOC foam concrete to be tested after the die is installed in example 1;
FIG. 3 is a schematic view of an integral specimen of the paraffin-magnesium oxychloride cement foam concrete in example 1;
FIG. 4 is a schematic illustration of the hydrolysis of the paraffin-magnesium oxychloride cement foam concrete monolithic test piece in example 1;
FIG. 5 is a schematic diagram of the pore structure model of the magnesium oxychloride cement foam concrete finally obtained in example 1.
Wherein:
1: air hole, 2: section, 3: MOC foam concrete, 4: mold, 5: fixing bolt, 6: paraffin wax, 7: water bath, 8: water, 9: a paraffin-magnesium oxychloride cement foam concrete integral test piece, 10: a porous entity.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example one
A method for manufacturing a magnesium oxychloride cement foam concrete air hole structure model based on paraffin comprises the following steps:
selecting representative magnesium oxychloride cement foam concrete, and cutting a section, wherein the section is kept clean and tidy, and the size of a cut sample is 100mm multiplied by 100 mm;
heating and melting paraffin to form plastic material liquid;
the magnesium oxychloride cement foam concrete is placed with the section upward, and a circle of metal mold is fixed around the section. The metal mold is made of four rectangular iron members (two of the rectangular members are 120mm multiplied by 60mm multiplied by 20mm, two are 100mm multiplied by 60mm multiplied by 20mm), and is fixed at the upper end of the magnesium oxychloride cement foam concrete by iron nails, and the distance between the section of the magnesium oxychloride cement foam concrete and the upper surface of the metal mold is 20 mm. Pouring the plastic material liquid into a mold, forming a plane on the surface of the poured plastic material liquid, enabling the plane to be horizontal to the upper surface of the mold, standing at room temperature for 25 minutes, and forming a stable solid after the paraffin plastic material liquid is solidified to form a paraffin-magnesium oxychloride cement foam concrete integral test piece;
hydrolyzing the paraffin-magnesium oxychloride cement foam concrete integral test piece, putting the test piece into a water bath kettle, completely immersing the test piece into water, wherein the hydrolysis temperature is 20 ℃, the hydrolysis process time is 14 days, observing that the magnesium oxychloride cement foam concrete completely sinks, slightly shaking a mould in the water to obtain a paraffin part with a clean surface, namely a magnesium oxychloride cement foam concrete pore structure model, wherein the surface distribution point of the formed paraffin model is a visual entity of an MOC concrete internal pore structure, namely a pore entity.
A characterization method of a magnesium oxychloride cement foam concrete air hole structure obtains characteristic parameters of magnesium oxychloride cement foam concrete through characterization of the magnesium oxychloride cement foam concrete air hole structure model, wherein the characteristic parameters comprise porosity, pore size distribution, average pore size, pore distribution, shape factor, pore wall thickness or connectivity.
In the above technical solution, the characterization includes at least one of microscope observation and SEM detection.
Scanning the surface of the model by adopting SEM to measure the number n, the diameter d and the height parameter l of the air hole entity 10. The porosity, pore size distribution, mean pore size, pore distribution, shape factor, pore wall thickness are then calculated.
The porosity is the percentage of the volume of pores in the block material to the total volume of the material in a natural state. The diameter of the above measurement is taken as the average d1According to the mean diameter d1Calculating the volume v of the average pore entity, wherein the volume v multiplied by the number n of the pore entities is the volume of the pore entities at the height of a surface layer, and the height of the surface layer is the average value l of the height parameters1The total volume of pores in the concrete test block can be expressed by the solid volume of pores in the model, V ═ n (4/3) pi (d)1/2)2(L/l1) Then, the MOC foam concrete has a porosity of θ V/L2(L is the side length of the test block).
Pore size distribution and pore distribution: is the percentage by number or volume of the pore sizes of the various stages present in the concrete. The diameter d of the solid pores on the surface of the model measured as above is classified according to the interval according to the sizes of the pores with different diameters, and the number of the pores in each interval is divided by the total number to obtain the pore size distribution.
③ average pore diameter: as described in (i).
Shape factor: refers to the degree to which the geometry of the foam concrete pores deviates from spherical. The hole shape factor (S) is expressed by the formula S ═ P2V (4 π A). In the formula: p is the pore perimeter and A is the pore area can be calculated from the pore diameter d described above. When S is 1, the air holes are spherical; when S is more than 1, the air holes are in a quasi-spherical shape. The larger the value of S, the more the shape of the pores deviates from the spherical shape.
Fifth, the hole wall thickness: scanning the surface of the model by adopting SEM, measuring the distance between two air hole entities, wherein the distance is the wall thickness of the air hole in the concrete, the two air hole entities are communicated with each other, and the communication rate is obtained by dividing the number of the air hole entities by the volume of the air hole.
Example two
A method for manufacturing a thermoplastic phenolic resin based magnesium oxychloride cement foam concrete air hole structure model comprises the following steps:
selecting representative magnesium oxychloride cement foam concrete, and cutting a section, wherein the section is kept clean and tidy, and the size of a cut sample is 100mm multiplied by 100 mm;
heating and melting the thermoplastic phenolic resin into plastic material liquid;
the magnesium oxychloride cement foam concrete is placed with the section upward, and a circle of metal mold is fixed around the section. The metal mold is made of four rectangular iron members (two of the rectangular members are 120mm multiplied by 60mm multiplied by 20mm, two are 100mm multiplied by 60mm multiplied by 20mm), and is fixed at the upper end of the magnesium oxychloride cement foam concrete by iron nails, and the distance between the section of the magnesium oxychloride cement foam concrete and the upper surface of the metal mold is 20 mm. Pouring the plastic material liquid into a mold, forming a plane on the surface of the poured plastic material liquid, enabling the plane to be horizontal to the upper surface of the mold, standing at room temperature for 25 minutes, and forming a stable solid after the paraffin plastic material liquid is solidified to form a paraffin-magnesium oxychloride cement foam concrete integral test piece;
hydrolyzing the paraffin-magnesium oxychloride cement foam concrete integral test piece, putting the test piece into a water bath kettle, completely immersing the test piece into water, wherein the hydrolysis temperature is 20 ℃, the hydrolysis process time is 14 days, observing that the magnesium oxychloride cement foam concrete completely sinks, slightly shaking a mould in the water to obtain a paraffin part with a clean surface, namely a magnesium oxychloride cement foam concrete pore structure model, wherein the surface distribution point of the formed paraffin model is a visual entity of an MOC concrete internal pore structure, namely a pore entity.
A characterization method of a magnesium oxychloride cement foam concrete air hole structure obtains characteristic parameters of magnesium oxychloride cement foam concrete through characterization of the magnesium oxychloride cement foam concrete air hole structure model, wherein the characteristic parameters comprise porosity, pore size distribution, average pore size, pore distribution, shape factor, pore wall thickness or connectivity.
EXAMPLE III
A method for manufacturing a silicon rubber magnesium oxychloride cement-based foam concrete air hole structure model comprises the following steps:
selecting representative magnesium oxychloride cement foam concrete, and cutting a section, wherein the section is kept clean and tidy, and the size of a cut sample is 100mm multiplied by 100 mm;
heating and melting silicon rubber to form plastic material liquid;
the magnesium oxychloride cement foam concrete is placed with the section upward, and a circle of metal mold is fixed around the section. The metal mold is made of four rectangular iron members (two of the rectangular members are 120mm multiplied by 60mm multiplied by 20mm, two are 100mm multiplied by 60mm multiplied by 20mm), and is fixed at the upper end of the magnesium oxychloride cement foam concrete by iron nails, and the distance between the section of the magnesium oxychloride cement foam concrete and the upper surface of the metal mold is 20 mm. Pouring the plastic material liquid into a mold, forming a plane on the surface of the poured plastic material liquid, enabling the plane to be horizontal to the upper surface of the mold, standing at room temperature for 25 minutes, and forming a stable solid after the paraffin plastic material liquid is solidified to form a paraffin-magnesium oxychloride cement foam concrete integral test piece;
hydrolyzing the paraffin-magnesium oxychloride cement foam concrete integral test piece, putting the test piece into a water bath kettle, completely immersing the test piece into water, wherein the hydrolysis temperature is 20 ℃, the hydrolysis process time is 14 days, observing that the magnesium oxychloride cement foam concrete completely sinks, slightly shaking a mould in the water to obtain a paraffin part with a clean surface, namely a magnesium oxychloride cement foam concrete pore structure model, wherein the surface distribution point of the formed paraffin model is a visual entity of an MOC concrete internal pore structure, namely a pore entity.
A characterization method of a magnesium oxychloride cement foam concrete air hole structure obtains characteristic parameters of magnesium oxychloride cement foam concrete through characterization of the magnesium oxychloride cement foam concrete air hole structure model, wherein the characteristic parameters comprise porosity, pore size distribution, average pore size, pore distribution, shape factor, pore wall thickness or connectivity.
Example four
A manufacturing method of a PE-polyethylene magnesium oxychloride cement-based foam concrete air hole structure model comprises the following steps:
selecting representative magnesium oxychloride cement foam concrete, and cutting a section, wherein the section is kept clean and tidy, and the size of a cut sample is 100mm multiplied by 100 mm;
heating and melting PE-polyethylene to form plastic material liquid;
the magnesium oxychloride cement foam concrete is placed with the section upward, and a circle of metal mold is fixed around the section. The metal mold is made of four rectangular iron members (two of the rectangular members are 120mm multiplied by 60mm multiplied by 20mm, two are 100mm multiplied by 60mm multiplied by 20mm), and is fixed at the upper end of the magnesium oxychloride cement foam concrete by iron nails, and the distance between the section of the magnesium oxychloride cement foam concrete and the upper surface of the metal mold is 20 mm. Pouring the plastic material liquid into a mold, forming a plane on the surface of the poured plastic material liquid, enabling the plane to be horizontal to the upper surface of the mold, standing at room temperature for 25 minutes, and forming a stable solid after the paraffin plastic material liquid is solidified to form a paraffin-magnesium oxychloride cement foam concrete integral test piece;
hydrolyzing the paraffin-magnesium oxychloride cement foam concrete integral test piece, putting the test piece into a water bath kettle, completely immersing the test piece into water, wherein the hydrolysis temperature is 20 ℃, the hydrolysis process time is 14 days, observing that the magnesium oxychloride cement foam concrete completely sinks, slightly shaking a mould in the water to obtain a paraffin part with a clean surface, namely a magnesium oxychloride cement foam concrete pore structure model, wherein the surface distribution point of the formed paraffin model is a visual entity of an MOC concrete internal pore structure, namely a pore entity.
A characterization method of a magnesium oxychloride cement foam concrete air hole structure obtains characteristic parameters of magnesium oxychloride cement foam concrete through characterization of the magnesium oxychloride cement foam concrete air hole structure model, wherein the characteristic parameters comprise porosity, pore size distribution, average pore size, pore distribution, shape factor, pore wall thickness or connectivity.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. A method for manufacturing a magnesium oxychloride cement foam concrete air hole structure model based on a plastic material is characterized by comprising the following steps:
heating and melting the plastic material into plastic material liquid, wherein the melting point of the plastic material is 50-200 ℃, and the plastic material liquid is insoluble in water;
fixing a circle of die around the cross section of the magnesium oxychloride cement foam concrete to be tested, and pouring the plastic material liquid into the die to form a plastic material-magnesium oxychloride cement foam concrete integral test piece;
and hydrolyzing the plastic material-magnesium oxychloride cement foam concrete integral test piece at the hydrolysis temperature of 0-30 ℃, and taking the complete hydrolysis of the magnesium oxychloride cement foam concrete to be tested as the hydrolysis end point, wherein the rest part is the magnesium oxychloride cement foam concrete air hole structure model.
2. The method for producing a model of an air pore structure of magnesium oxychloride cement foam concrete according to claim 1, wherein the plastic material is paraffin, thermoplastic resin or rubber.
3. The method of claim 2, wherein the thermoplastic resin is selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene oxide, and polysulfone.
4. The method for producing a model of an air pore structure of magnesium oxychloride cement foam concrete according to claim 1, wherein after pouring the plastic material liquid into the mold, the method further comprises: and after the plastic material liquid is solidified into a stable solid, the time of the process of solidifying the plastic material liquid into the stable solid is 0.2-1 hour.
5. The method for producing the model of the air hole structure of the magnesium oxychloride cement foam concrete according to claim 1, wherein the time of the hydrolysis process is 3 to 28 days.
6. The method for making the model of the air hole structure of magnesium oxychloride cement foam concrete according to claim 1, wherein the mold is selected from iron, stainless steel and copper metal molds, and the mold is fixed by embedding, linking, buckling or bonding.
7. The method for producing a model of an air pore structure of magnesium oxychloride cement foam concrete according to claim 1, wherein before pouring the plastic material liquid into the mold, the method further comprises: and heating the magnesium oxychloride cement foam concrete to be detected.
8. A method for manufacturing a magnesium oxychloride cement foam concrete air hole structure model based on a plastic material is characterized by comprising the following steps:
selecting representative magnesium oxychloride cement foam concrete, and cutting a section, wherein the section is kept clean and tidy;
heating and melting paraffin to form plastic material liquid;
fixing a circle of metal mold around the section, pouring the plastic material liquid into the mold, forming a plane on the surface of the poured plastic material liquid, enabling the plane to be horizontal to the upper surface of the metal mold, and forming a stable solid after the plastic material liquid is solidified for 25 minutes to form a paraffin-magnesium oxychloride cement foam concrete integral test piece;
and hydrolyzing the paraffin-magnesium oxychloride cement foam concrete integral test piece, wherein the hydrolysis temperature is 20-25 ℃, the hydrolysis process time is 7-14 days, and the residual paraffin part is the magnesium oxychloride cement foam concrete pore structure model.
9. Use of the magnesium oxychloride cement foam concrete pore structure model prepared by the method according to any one of claims 1 to 8 in structural characterization of porosity, pore size distribution, average pore size, shape factor, pore wall thickness or connectivity of the magnesium oxychloride cement foam concrete pores.
10. The use of claim 9, wherein the characterization comprises at least one of microscopic observation, SEM inspection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811401967.5A CN110426407B (en) | 2018-11-22 | 2018-11-22 | Method for manufacturing and characterizing magnesium oxychloride cement foam concrete air hole structure model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811401967.5A CN110426407B (en) | 2018-11-22 | 2018-11-22 | Method for manufacturing and characterizing magnesium oxychloride cement foam concrete air hole structure model |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110426407A CN110426407A (en) | 2019-11-08 |
| CN110426407B true CN110426407B (en) | 2021-08-27 |
Family
ID=68407322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811401967.5A Active CN110426407B (en) | 2018-11-22 | 2018-11-22 | Method for manufacturing and characterizing magnesium oxychloride cement foam concrete air hole structure model |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110426407B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003238574A (en) * | 2001-12-12 | 2003-08-27 | Mitsubishi Chemicals Corp | Organic group-supporting silica gel |
| CN204086262U (en) * | 2014-07-08 | 2015-01-07 | 中交一公局厦门工程有限公司 | A kind of test unit of simulating for sprayed concrete and slip casting |
| CN107868232A (en) * | 2016-09-28 | 2018-04-03 | 中科院广州化学有限公司南雄材料生产基地 | A kind of water-base epoxy porous resin composite and its preparation method and application |
| CN108546031A (en) * | 2018-04-24 | 2018-09-18 | 常州五荣化工有限公司 | A kind of preparation method of foam concrete |
-
2018
- 2018-11-22 CN CN201811401967.5A patent/CN110426407B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003238574A (en) * | 2001-12-12 | 2003-08-27 | Mitsubishi Chemicals Corp | Organic group-supporting silica gel |
| CN204086262U (en) * | 2014-07-08 | 2015-01-07 | 中交一公局厦门工程有限公司 | A kind of test unit of simulating for sprayed concrete and slip casting |
| CN107868232A (en) * | 2016-09-28 | 2018-04-03 | 中科院广州化学有限公司南雄材料生产基地 | A kind of water-base epoxy porous resin composite and its preparation method and application |
| CN108546031A (en) * | 2018-04-24 | 2018-09-18 | 常州五荣化工有限公司 | A kind of preparation method of foam concrete |
Non-Patent Citations (2)
| Title |
|---|
| Numerical simulation of moisture transport in concrete based on a pore size distribution model;Qinghua Huang,et al;《Cement and Concrete Research》;20150131;第31-43页 * |
| 环氧树脂改性超轻泡沫混凝土气孔结构及性能;蒋俊 等;《中国硅酸盐学会水泥分会第六届学术年会论文摘要集》;20161216;第47页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110426407A (en) | 2019-11-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Liu et al. | Thermal insulation material based on SiO2 aerogel | |
| CN105604239B (en) | A kind of foam concrete functionally gradient composite plate and preparation method thereof | |
| EP2746764B1 (en) | Method for testing setting time of cement-based material | |
| Bhattacharjee et al. | Permeable porosity and thermal conductivity of construction materials | |
| CN103664114B (en) | Self-heat-insulating fly ash autoclaved aerated concrete block and preparation method thereof | |
| Zhu et al. | Characterisation of pore structure development of alkali-activated slag cement during early hydration using electrical responses | |
| CN109057078A (en) | A kind of method of 3D printing building heat preservation sound-insulation wall | |
| Jiang et al. | Effect of thermal insulation components on physical and mechanical properties of plant fibre composite thermal insulation mortar | |
| CN110423092B (en) | Magnesium oxychloride cement foam concrete air hole structure model manufacturing and characterization method based on magnesium phosphate cement | |
| CN107673696A (en) | A kind of foam concrete self-insulating wall material and preparation method thereof | |
| CN106866177B (en) | Fiber foam concrete and preparation method thereof | |
| CN107445651A (en) | Heat-insulating concrete and preparation method thereof | |
| Hu et al. | Research on properties of foamed concrete reinforced with small sized glazed hollow beads | |
| CN113984527A (en) | Method for calculating compressive strength of pervious concrete | |
| Kolawole et al. | Plastic cracking behaviour of concrete and its interdependence on rheo-physical properties | |
| CN110426407B (en) | Method for manufacturing and characterizing magnesium oxychloride cement foam concrete air hole structure model | |
| CN105625588B (en) | A kind of building heat insulating exterior wall construction method | |
| CN110698223B (en) | Self-strength gradient foam concrete material and preparation method thereof | |
| CN109030794B (en) | Concrete temperature rise rapid detection method | |
| CN110421696B (en) | Magnesium oxychloride cement foam concrete air hole structure model manufacturing and characterization method based on magnesium oxysulfate cement | |
| CN110423133B (en) | Method for manufacturing and characterizing magnesium oxychloride cement foam concrete air hole structure model based on modified magnesium oxychloride cement | |
| CN109085035A (en) | The production method of the test specimen of rocks containing prefabricated crack | |
| CN108329002A (en) | Light foamed geopolymer composite insulation board and preparation method thereof | |
| CN103015738B (en) | Ultrathin mortar joint masonry construction method of sintered shale insulation hollow block pulp bonding method | |
| CN109437966A (en) | A kind of foam concrete and preparation method thereof based on preformed foam pore property |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |