CN108975814B - Light composite concrete outer wall and production method thereof - Google Patents
Light composite concrete outer wall and production method thereof Download PDFInfo
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- CN108975814B CN108975814B CN201810906201.6A CN201810906201A CN108975814B CN 108975814 B CN108975814 B CN 108975814B CN 201810906201 A CN201810906201 A CN 201810906201A CN 108975814 B CN108975814 B CN 108975814B
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- 239000002131 composite material Substances 0.000 title claims abstract description 119
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
- E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
- E04G15/063—Re-usable forms
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a lightweight concrete outer wall, and discloses a lightweight composite concrete outer wall and a production method thereof, wherein the lightweight composite concrete outer wall comprises a steel bar support, an embedded part fixed in the steel bar support, a concrete matrix filling and coating the steel bar support, and a coating layer coated on the outer side of the concrete matrix; the lightweight composite concrete comprises the following raw materials in parts by weight: 100 parts of Portland cement, 100 parts of water, 80 parts of broken stone aggregate, 8-12 parts of strong acid type cation exchange resin, 30-40 parts of natural sand and 7-10 parts of polytetrafluoroethylene filler; the preparation method comprises the following steps: the light composite concrete outer wall is obtained by injecting light composite concrete obtained by mixing raw materials into an outer wall mould with a steel bar support and an embedded part, curing and curing the light composite concrete to obtain a concrete matrix, and coating a coating layer outside the concrete matrix.
Description
Technical Field
The invention relates to a lightweight concrete outer wall, in particular to a lightweight composite concrete outer wall and a production method thereof.
Background
The building outer wall is a common component in the existing building construction, and the decorative building board is directly hung on the wall surface or hung on a steel frame in the air by using a metal hanger. The existing concrete outer wall is composed of a concrete matrix composed of foamed concrete, an embedded part embedded in the concrete matrix and a decorative layer coated outside the concrete matrix, wherein the embedded part is used for being fixed with a wall surface or a steel frame. The foamed concrete, also known as foam concrete or light concrete, is a novel light heat-insulating material containing a large number of closed air holes, which is formed by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine, uniformly mixing the foam with cement slurry, then carrying out cast-in-place construction or mould forming through a pumping system of the foaming machine and carrying out natural curing.
Because the aggregate of the foaming concrete is selected to be fine aggregate with the diameter of less than 4.75mm or fine sand for facilitating foaming, the compression resistance and bending resistance of the finished concrete are weaker than those of concrete using coarse aggregate, and the foaming concrete is easy to break or fracture due to impact when being transported and used for an outer wall. If the coarse aggregate is directly used, a large amount of bubbles generated by the foaming agent are adsorbed on the surface of the aggregate, so that the aggregate bonding strength of the outer surface of the concrete is low, the aggregate is easy to fall off, meanwhile, the specific surface area of the coarse aggregate is small, and free water is accumulated in closed air holes formed after the bubbles are adsorbed on the surface and solidified, so that the alkali-aggregate reaction is promoted, the concrete is expanded and cracked, and the actual using effect of the foamed concrete outer wall is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide the lightweight composite concrete outer wall which has good actual use effect, reduces the weight of the outer wall, reduces the load of the outer wall fixing bracket, improves the compression resistance and the bending resistance of the lightweight composite concrete, and reduces the possibility of fracture or breakage of the outer wall after impact.
The technical purpose of the invention is realized by the following technical scheme:
the light composite concrete outer wall is characterized by comprising a cage-shaped steel bar support, an embedded part fixed in the steel bar support, a concrete matrix formed by filling and coating light composite concrete on the steel bar support and then curing the light composite concrete, and a coating layer coated on one side of the concrete matrix, which faces away from the room or the wall surface on which the concrete matrix is installed, wherein the coating layer is a heat preservation layer or an anticorrosive coating layer or a decorative coating layer, and the light composite concrete comprises the following raw materials in parts by weight:
100 parts of Portland cement, namely 100 parts of Portland cement,
200 parts of water, namely 200 parts of water,
80 parts of broken stone aggregate,
8-12 parts of strong acid type cation exchange resin,
30-40 parts of natural sand,
7-10 parts of polytetrafluoroethylene filler.
By adopting the technical scheme, the strong acid type cation exchange resin can expand after absorbing water, gradually dehydrate after the surface of the light composite concrete is cured, and further form closed air holes to replace a foaming agent, and the strong acid type cation exchange resin can not be actively adsorbed on the surface of the broken stone aggregate, so that the closed air holes are prevented from being gathered on the surface of the broken stone aggregate;
meanwhile, when the strong acid type cation exchange resin absorbs water in the light composite concrete, the strong acid type cation exchange resin exchanges with cations in free water of the light composite concrete, so that Na is reduced+、K+And Na is inhibited when the strong acid type cation exchange resin is in an alkaline environment2SiO3And K2SiO3Sol generation of (2), and Ca2+、Mg2+With SiO2CaSiO generated by reaction in alkaline environment3、MgSiO3Difficult to re-ionize to give Ca2+、Mg2+Therefore, the influence of the strong acid type cation exchange resin is small, and the effect of inhibiting alkali-aggregate reaction is further achieved;
after the polytetrafluoroethylene filler is mixed and dispersed in the lightweight composite concrete, the impermeability of the lightweight composite concrete is improved, the alkali-aggregate reaction caused by water vapor erosion on the surface of the lightweight composite concrete in the later period is inhibited, meanwhile, in the curing and curing process of the lightweight composite concrete, the water seepage is hindered, the alkali frost is prevented from being separated out, and the strong acid type cation exchange resin is prevented from being dehydrated before the lightweight composite concrete is cured to cause the sealing air holes to lose support and collapse
On the other hand, the polytetrafluoroethylene filler is matched with the effect of hindering the penetration of water in the lightweight composite concrete after the curing is started, the strong acid type cation exchange resin is repeatedly dehydrated and absorbed in the process of curing and curing, the dehydrated free water is used as a main source of the free water required by the hydration reaction and the alkali-aggregate reaction in the curing stage, and the water acquisition capacity of the hydration reaction in the curing and curing stage of the lightweight composite concrete is higher than that of the alkali-aggregate reaction, so that the strong acid type cation exchange resin controls the free water content in the lightweight composite concrete in the later period of the curing stage and the curing stage, thereby promoting the hydration reaction and inhibiting the alkali-aggregate reaction;
in conclusion, the normal curing and maintenance of the lightweight composite concrete are ensured, the bonding strength of the broken stone aggregate is improved, the alkali aggregate reaction is inhibited, the use defect of the coarse aggregate in the lightweight composite concrete is avoided, the compression resistance and the bending resistance of the lightweight composite concrete are improved, the weight of the outer wall is reduced, the load-carrying composite of the outer wall fixing support is reduced, and the possibility that the outer wall is broken or crushed after being impacted is reduced.
Preferably, the particle size of the strong acid type cation exchange resin is 0.05-0.1 mm.
By adopting the technical scheme, the size of the closed air holes is controlled, and the condition that the closed air holes are too large and communicated with each other to form a cavity in the light composite concrete is avoided.
Preferably, the polytetrafluoroethylene filler is a round sheet with a thickness of 0.02-0.04mm and a diameter of 0.6-0.8 cm.
By adopting the technical scheme, compared with granular polytetrafluoroethylene filler with the same volume, the blocking effect on water permeation in the light composite concrete is more obvious.
Preferably, the particle size of the crushed stone aggregate is 1-1.2 cm.
By adopting the technical scheme, the ratio of the diameter of the polytetrafluoroethylene filler to the particle size of the broken stone aggregate is 0.5-0.8, the polytetrafluoroethylene filler is dispersed in the light composite concrete more uniformly and is easier to fill gaps between the broken stone aggregates.
Preferably, the raw materials of the lightweight composite concrete also comprise 5-6 parts of short glass fiber and 7-10 parts of silane cross-linking agent.
By adopting the technical scheme, the short glass fiber can improve the tensile resistance and the thermal expansion resistance of the light composite concrete, meanwhile, under the action of the silane cross-linking agent, the short glass fiber and the polytetrafluoroethylene filler are bonded, and after the two polytetrafluoroethylene fillers are connected by the short glass fiber, an anchoring structure taking the polytetrafluoroethylene filler as an anchor head and the short glass fiber as an anchor rope is formed in the light composite concrete, so that the tensile resistance, the bending resistance and the thermal expansion resistance of the light composite concrete are further improved.
Preferably, the short glass fiber has a length of 2 to 4 cm.
By adopting the technical scheme, the single short glass fiber is prevented from being bent for many times in the light composite concrete, so that the short glass fiber is used as the tension force of the anchor cable when the light composite concrete deforms.
Aiming at the defects in the prior art, the second purpose of the invention is to provide a production method of a light composite concrete outer wall, which can obtain the light composite concrete outer wall with low density and excellent compression resistance and fracture resistance.
The technical purpose of the invention is realized by the following technical scheme:
a production method of a light composite concrete outer wall comprises the following steps:
s1: splicing steel plates into a box-shaped outer wall mold;
s2: selecting a steel bar to tie a steel bar bracket and welding an embedded part in the steel bar bracket;
s3: placing a steel bar bracket and an embedded part welded in the steel bar bracket into an outer wall mold;
s4: weighing 100 parts of portland cement, 200 parts of water, 80 parts of broken stone aggregate, 8-12 parts of strong acid type cation exchange resin, 30-40 parts of natural sand and 7-10 parts of polytetrafluoroethylene filler in parts by mass, soaking the strong acid type cation exchange resin in water for 2-3 hours, fully absorbing water and expanding, adding the mixture and other raw materials into a stirrer, and uniformly mixing and stirring to obtain the light composite concrete;
s5: pouring the light composite concrete into the outer wall mold in the step S3, and performing manual or mechanical vibration during the pouring process;
s6: after the lightweight composite concrete in the S5 is cured to form a concrete matrix, disassembling the outer wall mold, and curing the obtained concrete matrix for 28 days;
s7: and (5) coating a coating layer on the side, back to the room or the house where the concrete matrix is installed, of the concrete matrix after the curing of S6, and curing the coating layer to obtain the lightweight composite concrete outer wall.
By adopting the technical scheme, the light composite concrete outer wall with small density and excellent compression resistance and fracture resistance can be obtained, meanwhile, the strong acid type cation exchange resin is firstly foamed into water to fully absorb water and expand, the gradual dehydration of the strong acid type cation exchange resin is ensured, and further, closed air holes are formed to replace the foaming agent.
Preferably, the polytetrafluoroethylene filler is a circular sheet, the thickness of the polytetrafluoroethylene filler is 0.02-0.04mm, the diameter of the polytetrafluoroethylene filler is 0.6-0.8cm, the center thickness of one circular side face of the polytetrafluoroethylene filler is greater than the thickness of the edge of the polytetrafluoroethylene filler, the bottom surface of the interior of the outer wall mold is horizontally arranged and corresponds to the side of the concrete matrix, which faces away from the room or the house where the concrete matrix is installed, and the vibrating direction in the S5 includes the horizontal direction.
Through adopting above-mentioned technical scheme, the focus of polytetrafluoroethylene filler is located one side of its circular slice uplift side, along with the vibration that vibrates and drive the outer wall mould, and the polytetrafluoroethylene filler receives its focus position influence, and along with the vibration goes on, the polytetrafluoroethylene filler tends to the horizontality and rotates until rubble aggregate looks butt unable removal or level place, strengthens the wall effect that polytetrafluoroethylene filler permeates to concrete base member dorsad indoor or dorsad its house one side steam of installing from this.
In conclusion, the invention has the following beneficial effects:
1. the strong acid type cation exchange resin can expand after absorbing water, gradually dehydrate after the surface of the light composite concrete is cured, and further form closed air holes to replace a foaming agent, and the strong acid type cation exchange resin can not be actively adsorbed on the surface of the broken stone aggregate, so that the closed air holes are prevented from being gathered on the surface of the broken stone aggregate, the combination of the broken stone aggregate and cement is enhanced, and the broken stone aggregate is prevented from being separated; the polytetrafluoroethylene filler is matched with the blocking effect of water permeation in the light composite concrete after the curing is started, the strong acid type cation exchange resin is repeated in the processes of dehydration and water absorption during the curing and curing stages, the dehydrated free water is used as a main source of the free water required by the hydration reaction and the alkali-aggregate reaction in the curing stage, and the water acquisition capacity of the hydration reaction in the curing and curing stages of the light composite concrete is stronger than that of the alkali-aggregate reaction, so that the strong acid type cation exchange resin controls the free water content in the light composite concrete at the later stage and the curing stage of the curing stage, thereby promoting the hydration reaction and inhibiting the alkali-aggregate reaction; the normal operation of the light composite concrete curing and maintenance is ensured, meanwhile, the bonding strength of the broken stone aggregate is improved, the alkali aggregate reaction is inhibited, the use defect of coarse aggregate in the light composite concrete is avoided, the compression resistance and the bending resistance of the light composite concrete are improved, the weight of the outer wall is further reduced, the load-bearing composite of the outer wall fixing support is reduced, and the possibility that the outer wall is broken or crushed after being impacted is reduced;
2. when the strong acid type cation exchange resin absorbs water in the light composite concrete, the strong acid type cation exchange resin exchanges with cations in free water of the light composite concrete to reduce Na+、K+And Na is inhibited when the strong acid type cation exchange resin is in an alkaline environment2SiO3And K2SiO3Sol generation of (2), and Ca2+、Mg2+With SiO2CaSiO generated by reaction in alkaline environment3、MgSiO3Difficult to re-ionize to give Ca2+、Mg2+Therefore, the influence of the strong acid type cation exchange resin is small, so that the effect of inhibiting alkali-aggregate reaction is achieved, and the concrete matrix is prevented from cracking due to the influence of the alkali-aggregate reaction;
3. after the polytetrafluoroethylene filler is mixed and dispersed in the light composite concrete, the impermeability of the light composite concrete is improved, the alkali-aggregate reaction caused by the corrosion of water vapor on the surface of the light composite concrete in the later period is inhibited, meanwhile, in the curing and curing process of the light composite concrete, the seepage of water is hindered, the precipitation of alkali frost is avoided, and the collapse of a sealed air hole caused by the dehydration of strong acid type cation exchange resin before the curing of the light composite concrete is prevented;
4. the raw materials of the light composite concrete also comprise short glass fibers and a silane cross-linking agent, the short glass fibers can improve the tensile property and the thermal expansion resistance of the light composite concrete, meanwhile, under the action of the silane cross-linking agent, the short glass fibers and the polytetrafluoroethylene fillers are bonded, and after the two polytetrafluoroethylene fillers are connected by the short glass fibers, an anchoring structure which takes the polytetrafluoroethylene fillers as an anchor head and the short glass fibers as an anchor rope is formed in the light composite concrete, so that the tensile property, the bending resistance and the thermal expansion resistance of the light composite concrete are further improved; 5. the polytetrafluoroethylene filler is a circular sheet body, the thickness of the polytetrafluoroethylene filler is 0.02-0.04mm, the diameter of the polytetrafluoroethylene filler is 0.6-0.8cm, the center thickness of one circular side face of the polytetrafluoroethylene filler is larger than the edge thickness of the polytetrafluoroethylene filler, the bottom surface inside the outer wall mold is horizontally arranged and corresponds to one side of the concrete matrix, which faces away from the room or the house where the polytetrafluoroethylene filler is installed, the vibration direction in S5 comprises vibration in the horizontal direction, the polytetrafluoroethylene filler is driven to vibrate along with the vibration, the polytetrafluoroethylene filler is influenced by the gravity center position of the polytetrafluoroethylene filler, the polytetrafluoroethylene filler tends to rotate in the horizontal state along with the vibration until the broken stone aggregates are abutted and cannot move or be horizontally placed, and therefore the water vapor permeation blocking effect of the polytetrafluoroethylene filler to one side of the concrete matrix, which faces away from the room or the house where the polytetrafluoroethylene.
Drawings
FIG. 1 is a cross-sectional view of a lightweight composite concrete exterior wall;
FIG. 2 is a schematic structural view of an exterior wall mold;
FIG. 3 is a cross-sectional view of the polytetrafluoroethylene filler in example 3 taken along the axial center thereof.
Reference numerals: 1. a concrete matrix; 2. a steel bar support; 3. embedding parts; 4. an outer wall fixing bracket; 5. a wall surface; 6. a coating layer; 7. an outer wall mold; 71. a steel plate; 8. a polytetrafluoroethylene filler; 81. a conical portion.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In the case of the example 1, the following examples are given,
as shown in fig. 1, the light composite concrete outer wall comprises a cage-shaped steel bar support 2, an embedded part 3 fixed in the steel bar support 2, a concrete matrix 1 formed by filling and coating the steel bar support 2 with light composite concrete and then curing, and a coating layer 6 coated on one side of the concrete matrix 1, which faces away from a room or a wall surface 5 on which the concrete matrix is installed. One end of the embedded part 3 penetrates out of the concrete matrix 1 and is fixed with a wall body or an outer wall fixing support 4. The coating layer 6 is a heat-insulating layer, an anticorrosive coating layer or a decorative coating layer, which is not an innovation point of the present invention, and has no influence on the single mechanical property of the concrete matrix 1, so that the detailed description is omitted.
The lightweight composite concrete comprises the following raw materials in parts by weight:
100 parts of Portland cement, namely 100 parts of Portland cement,
200 parts of water, namely 200 parts of water,
80 parts of broken stone aggregate,
8-12 parts of strong acid type cation exchange resin,
30-40 parts of natural sand,
87-10 parts of polytetrafluoroethylene filler.
The portland cement is ordinary portland cement with the code of P.O 42.5.5. The broken stone aggregate is selected from commercial products of Hebei Maoyi building materials Limited company, Lingshou county Zeolite mineral processing factory, and Sichuan Yuankang building materials Limited company, and the light composite concrete of the same batch is selected from the broken stone aggregate ordered by the same company in the same batch, and the particle size of the broken stone aggregate is 1-1.2 cm. The strong acid cation exchange resin is obtained by mechanically crushing and screening a strong acid styrene cation exchange resin (732) which is a product sold in the Processingen south resin Co., Ltd, and the particle size of the strong acid cation exchange resin is 0.05-0.1 mm. The natural sand is fine river sand of 50-100 meshes sold in Henchuan mineral processing plant of Lingshou county and Hao dry mineral powder processing plant of Lingshou county. The polytetrafluoroethylene filler 8 is a customized product of the Aifshi tube valve Co., Ltd, Yangzhong, and the polytetrafluoroethylene filler 8 is a circular sheet with the thickness of 0.02-0.04mm and the diameter of 0.6-0.8 cm.
The production method of the light composite concrete outer wall comprises the following steps:
s1: splicing the steel plates 71 into a box-shaped outer wall mold 7;
s2: selecting a steel bar to tie a steel bar bracket 2 and welding an embedded part 3 in the steel bar bracket 2;
s3: placing the steel bar bracket 2 and the embedded part 3 welded in the steel bar bracket 2 into an outer wall mold 7;
s4: weighing 100 parts of portland cement, 200 parts of water, 80 parts of broken stone aggregate, 8-12 parts of strong acid type cation exchange resin, 30-40 parts of natural sand and 87-10 parts of polytetrafluoroethylene filler, soaking the strong acid type cation exchange resin in the water for 2-3 hours, fully absorbing water and expanding, adding the obtained product and other raw materials into a stirrer, and uniformly mixing and stirring to obtain the light composite concrete;
s5: pouring the light composite concrete into the outer wall mold 7 in the step S3, and performing manual or mechanical vibration during the pouring process;
s6: after the lightweight composite concrete in the S5 is cured to form the concrete matrix 1, the outer wall mold 7 is disassembled, and the obtained concrete matrix 1 is maintained for 28 days;
s7: and (6) coating the coating layer 6 on the side, back to the room or the house where the concrete matrix 1 is installed, of the concrete matrix 1 after the curing of S6 is finished, and curing the coating layer 6 to obtain the lightweight composite concrete outer wall.
As shown in fig. 2, the exterior wall mold 7 is rectangular and is formed by splicing five steel plates 71, the upper end of the exterior wall mold is open, and the bottom surface of the exterior wall mold is horizontal.
For the better contrast light composite concrete outer wall receives the stimulated reaction when assaulting, choose for use light composite concrete to detect, avoid the different deviation as usual of steel bar support 2. The lightweight composite concretes of examples 1A-1F were obtained in different proportions and had the following specific compositions.
Meanwhile, the foam concrete was prepared from the existing cement foaming agent, portland cement, water, crushed stone aggregate, and natural sand in the same proportions as in examples 1A to 1F to obtain comparative examples 1A to 1F, wherein the cement foaming agent was SH-1261# commercially available from deep-sea energy-saving building materials science and technology Co., Ltd, Dongguan.
Then, the lightweight composite concrete obtained in examples 1A to 1F and the lightweight concrete obtained in comparative examples 1A to 1F were subjected to a compression test, a bending test and a permeation resistance test.
The compression test and the bending test are carried out according to the compression strength test and the bending strength test recorded in GB/T50081-2002 common concrete mechanical property test method standard. The impermeability test is carried out according to GB 50164-2011 concrete quality control standard and the content of the specification thereof. The test results of the compression test, the bending test and the permeation resistance test are as follows.
From the above, the compressive strength and the flexural strength of the lightweight composite concrete in examples 1A to 1F can reach C60, and the flexural strength can reach C40, which are both significantly higher than those of the lightweight composite concrete in comparative examples 1A to 1F, and both the compressive strength and the flexural strength are improved; meanwhile, the light composite concrete in the examples 1A to 1F has better anti-permeability performance than the light composite concrete in the comparative examples 1A to 1F.
In a comparative example 2,
based on example 1A, the particle size of crushed stone aggregate was adjusted to obtain corresponding examples 2A to 2F.
Then, the lightweight composite concrete obtained in the comparative examples 2A to 2F is subjected to a compression test, a bending test and an impermeability test, and the test results are as follows.
According to the test results of the lightweight composite concrete obtained in the comparative examples 2A to 2F and the test results of the lightweight composite concrete obtained in the example 1A, when the particle size of the crushed stone aggregate is between 1 cm and 2cm, the compressive strength and the flexural strength of the lightweight composite concrete are excellent; meanwhile, when the crushed stone aggregate is 0.8-1.2cm, the light composite concrete has better anti-permeability performance, so the particle size of the crushed stone aggregate is preferably 1-1.2 cm.
In the case of the example 2, the following examples are given,
based on embodiment 1, the light composite concrete outer wall further comprises 5-6 parts of short glass fibers and 7-10 parts of a silane cross-linking agent. The short glass fiber is a commercial product JSW 021 purchased from the Jushi group, and the length of the short glass fiber is 2-3 cm. The silane cross-linking agent is vinyl trimethoxy silane, and is a commercial product RJ-171 of Hangzhou Rijiang New Material technology Co. In the step of configuring part of the lightweight composite concrete by the production method of the lightweight composite concrete exterior wall in the embodiment 1, the short glass fiber, the silane cross-linking agent and the portland cement are added together to finally prepare the lightweight composite concrete, and the specific components are as follows.
The lightweight composite concretes obtained in examples 2A to 2F were subjected to a compression test, a bending test and a permeation resistance test, and the test results were as follows.
From the above, after the short glass fibers and the silane cross-linking agent are added, the compressive strength and the anti-permeability performance of the light composite concrete are not changed greatly, and the breaking strength of the light composite concrete is improved.
In a comparative example 3,
based on example 2A, the short glass fibers were adjusted in length to give corresponding comparative examples 3A-3F.
Then, the lightweight composite concrete obtained in comparative examples 3A to 3F was subjected to a compression test, a bending test and an impermeability test, and the test results were as follows.
According to the test results of the light composite concrete obtained in the comparative examples 3A to 3F and the test results of the light composite concrete obtained in the example 2A, when the length of the short glass fiber is between 2 and 3cm, the flexural strength improvement effect of the light composite concrete is excellent.
In the case of the example 3, the following examples are given,
a lightweight composite concrete outer wall is based on embodiment 1, and is characterized in that polytetrafluoroethylene fillers 8 are in shapes. As shown in fig. 3, the ptfe packing 8 is a circular sheet, and a circular side surface of the ptfe packing is provided with a conical portion 81 coaxial therewith, and the central thickness of the conical portion 81 is greater than the edge thickness thereof. The bottom surface of the interior of the outer wall mold 7 is horizontally arranged and corresponds to the side of the concrete matrix 1 facing away from the room or the house where the concrete matrix is installed, and the vibration directions in S5 include horizontal and vertical vibration. Examples 3A-3F corresponding lightweight composite concrete was obtained according to the raw material ratios of examples 1A-1F.
The lightweight composite concrete obtained in examples 3A to 3F was subjected to an impermeability test conducted on the side facing away from the room or the house in which it was installed, and the test results are as follows.
From the above, the lightweight composite concrete obtained in examples 3A to 3F, which was faced away from the room or the side of the house where it was installed, had improved impermeability to the order of P6, compared to the lightweight composite concrete obtained in examples 1A to 1F, and was classified as impermeable concrete. The polytetrafluoroethylene filler 8 is vibrated, the polytetrafluoroethylene filler 8 tends to rotate in a horizontal state until the crushed stone aggregate is abutted and cannot be moved or placed horizontally, and the verification of the water vapor permeation separation effect of the polytetrafluoroethylene filler 8 on the side, back to the indoor space or back to the installed house, of the concrete matrix 1 is enhanced.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a light composite concrete outer wall, its characterized in that, includes steel bar support (2) of cage form, fixes built-in fitting (3) in steel bar support (2), fills and coats concrete base member (1) that steel bar support (2) postcuring formed by light composite concrete and coating in concrete base member (1) dorsad indoor or dorsad the coating (6) of its wall (5) one side of installing, coating (6) are heat preservation or anticorrosive coating layer or decorative coating layer, light composite concrete includes the following raw materials and the mass fraction of raw materials:
100 parts of Portland cement, namely 100 parts of Portland cement,
200 parts of water, namely 200 parts of water,
80 parts of broken stone aggregate,
8-12 parts of strong acid type cation exchange resin,
30-40 parts of natural sand,
7-10 parts of polytetrafluoroethylene filler (8).
2. The lightweight composite concrete exterior wall according to claim 1, wherein said strong acid type cation exchange resin has a particle size of 0.05-0.1 mm.
3. The lightweight composite concrete exterior wall according to claim 1, wherein the polytetrafluoroethylene filler (8) is a circular sheet having a thickness of 0.02-0.04mm and a diameter of 0.6-0.8 cm.
4. The lightweight composite concrete exterior wall according to claim 3, wherein the crushed stone aggregate has a particle size of 1 to 1.2 cm.
5. The lightweight composite concrete exterior wall according to claim 4, further comprising 5-6 parts of short glass fiber and 7-10 parts of silane cross-linking agent.
6. The lightweight composite concrete exterior wall according to claim 5, wherein the short glass fibers have a length of 2-4 cm.
7. The method for producing a lightweight composite concrete exterior wall according to claim 1, comprising the steps of:
s1: splicing steel plates (71) into a box-shaped outer wall mold (7);
s2: binding a steel bar bracket (2) by using a steel bar and welding an embedded part (3) in the steel bar bracket (2);
s3: placing the steel bar support (2) and the embedded part (3) welded in the steel bar support (2) into an outer wall mold (7);
s4: weighing 100 parts of portland cement, 200 parts of water, 80 parts of broken stone aggregate, 8-12 parts of strong acid type cation exchange resin, 30-40 parts of natural sand and 7-10 parts of polytetrafluoroethylene filler (8) according to the mass parts, firstly soaking the strong acid type cation exchange resin in the previously weighed 200 parts of water for 2-3 hours, fully absorbing water and expanding, then adding the obtained product and other raw materials into a stirrer together, and mixing and stirring uniformly to obtain the light composite concrete;
s5: pouring the light composite concrete into the outer wall mold (7) in the step S3, and performing manual or mechanical vibration during the pouring process;
s6: after the lightweight composite concrete in the S5 is cured to form the concrete matrix (1), the outer wall mold (7) is disassembled, and the obtained concrete matrix (1) is cured for 28 days;
s7: and (3) coating a coating layer (6) on the side, back to the room or the house where the concrete matrix (1) is installed, of the concrete matrix (1) after the curing of S6 is finished, and curing the coating layer (6) to obtain the lightweight composite concrete outer wall.
8. The method for producing a lightweight composite concrete exterior wall according to claim 7, wherein the polytetrafluoroethylene filler (8) is a circular sheet with a thickness of 0.02-0.04mm and a diameter of 0.6-0.8cm, the polytetrafluoroethylene filler (8) has a circular side with a central thickness greater than the edge thickness thereof, the bottom surface of the interior of the exterior wall mold (7) is horizontally disposed and corresponds to the side of the concrete matrix (1) facing away from the room or the house where the concrete matrix is installed, and the vibrating direction in S5 includes the horizontal direction.
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| JP2000185956A (en) * | 1998-12-24 | 2000-07-04 | Asou Cement Kk | Dustproof cement composition with improved strength |
| CN103526874A (en) * | 2013-10-31 | 2014-01-22 | 深圳海龙建筑制品有限公司 | Insulating and decorating integrated composite precast concrete component and manufacturing method thereof |
| CN104671806A (en) * | 2015-01-23 | 2015-06-03 | 湖州丰盛新材料有限公司 | Preparation method of nano silicon dioxide anti-skinning spraying coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000185956A (en) * | 1998-12-24 | 2000-07-04 | Asou Cement Kk | Dustproof cement composition with improved strength |
| CN103526874A (en) * | 2013-10-31 | 2014-01-22 | 深圳海龙建筑制品有限公司 | Insulating and decorating integrated composite precast concrete component and manufacturing method thereof |
| CN104671806A (en) * | 2015-01-23 | 2015-06-03 | 湖州丰盛新材料有限公司 | Preparation method of nano silicon dioxide anti-skinning spraying coating |
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