CN111763060B - Concrete protective layer reinforcing material, composite template cloth and application of concrete protective layer reinforcement - Google Patents
Concrete protective layer reinforcing material, composite template cloth and application of concrete protective layer reinforcement Download PDFInfo
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- CN111763060B CN111763060B CN202010526269.9A CN202010526269A CN111763060B CN 111763060 B CN111763060 B CN 111763060B CN 202010526269 A CN202010526269 A CN 202010526269A CN 111763060 B CN111763060 B CN 111763060B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
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- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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- 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
- E04G9/00—Forming or shuttering elements for general use
- E04G9/10—Forming or shuttering elements for general use with additional peculiarities such as surface shaping, insulating or heating, permeability to water or air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/0278—Polyurethane
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Abstract
The invention belongs to the technical field of building materials, and particularly relates to a concrete protective layer reinforcing material which comprises silica sol, nano silicon dioxide and magnesium fluosilicate. In addition, the invention also provides a composite template cloth containing the reinforced material, which comprises a surface layer, a middle layer containing the reinforced material and a base layer; the middle layer is a telescopic deformation material layer and contains a concrete strengthening material. Compared with the prior art, the invention has excellent effects of moisturizing and strengthening the protective layer, enables the surface of the concrete to be smoother, smoother and more compact, effectively enhances the mechanical property of the protective layer concrete by physical and chemical methods, simultaneously improves the durability of the reinforced concrete structure, effectively reduces the construction procedures, shortens the construction period, is simple and convenient to use, and is suitable for being popularized to relevant construction fields in a large range.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a method for reinforcing a concrete protective layer.
Background
The durability of the reinforced concrete structure is a complex problem in multiple aspects related to materials, structures, construction, environment and the like, according to the regulation of civil building design general rule in China, the endurance life of a general building is 50 years to 100 years, but the average service life of the general building in China is only about 30 years, and in contrast, the average service life of the English building reaches 132 years, and the average service life of the American building is 74 years. More than 40% of cement and steel in the world are consumed in China every year, but the average service life of a building is only 30 years, so that not only is the material of the building greatly wasted, but also the carbon emission of the building industry is directly increased, and the resource waste and the environmental pollution are aggravated. The rust swelling and cracking of the concrete protective layer caused by the corrosion of the steel bars are important signs of the durability limit state of the concrete structure and are important factors for determining the service life of the structure. Although the internal concrete of the reinforced concrete structure contributes most of the compression resistance, the concrete protective layer wrapping the reinforcing steel bars is the most important barrier for preventing the reinforcing steel bars from being corroded, and the pore structure and the characteristics of the protective layer determine the service quality and the service life of the concrete structure. According to the concrete structure design specification, the thickness of the protective layer of the steel bar is 2-6 cm. The steel bar surface can form the stable passive film of one deck in the alkaline environment of concrete under normal conditions, in case external corrosive medium such as chlorion invades, the passivation layer will suffer destruction, cause the reinforcing bar corrosion, the volume of corrosion result is 2-6 times of the reinforcing bar volume of not corroding, volume expansion makes reinforcing bar and concrete interface produce the rusty expansive force, lead to the formation and the extension of protective layer apparent crack then, in case protective layer concrete fracture or peel off, air and water will further aggravate the reinforcing bar corrosion with the reinforcing bar contact. After the concrete is hardened and demoulded, the surface of the concrete often has defects such as honeycombs, pitted surfaces, sand holes, cracks and the like, so that how to improve the performance of the protective layer and enhance the durability of the reinforced concrete structure becomes a key point of research.
To improve the performance of the protective concrete, the site construction technicianAnd related researchers have conducted a great deal of thought and exploration: one way is to use permeable formwork cloth to discharge excess moisture and air bubbles of fresh concrete during pouring, so as to generate more uniform and compact calcium silicate hydrate on the surface layer and improve the strength and durability of the concrete surface layer, such as: ZL 201720994321.7 discloses a concrete permeable and water permeable formwork fabric comprising a layer of PP polypropylene fibres and a layer of ES fibres, which improves the strength and durability of concrete by reducing the water cement ratio of the surface concrete. Patent ZL 201210150182.1 discloses a permeable template cloth and a preparation method thereof, which is formed by compounding a surface layer, an intermediate layer and a base layer in a needling mode, has excellent air permeability and drainage effects, enables the surface of cement concrete to be more compact, and improves durability; another way is that after the concrete is hardened and demoulded, the concrete surface is coated or sprayed with reagents such as reinforcing agent, repairing agent or hardening accelerator, etc., such as: CN 201810085811.4 discloses a concrete reinforcing and repairing agent, which can penetrate into the interior of concrete to increase the use strength of the concrete; ZL 201510690010.7 discloses a novel concrete reinforcing auxiliary agent capable of exciting SiO in concrete2And Al2O3Ca (OH) produced by hydration with cement2Multiple hydration occurs to generate CSH gel, thereby improving the performances of the concrete such as strength, durability and the like. However, the first method only utilizes the physical characteristics of the formwork cloth, such as water permeability and air permeability, to reduce the water-cement ratio of the surface concrete without any chemical enhancement; although materials such as the reinforcing aid used in the second mode have a chemical permeation enhancing effect, the penetration depth of the concrete is often only 3-8mm because the structure of the concrete is already dense after initial setting, and the thickness of the protective layer is 2-6cm, so that the reinforcing effect of the mode on the concrete protective layer is very limited. And the construction processes of the two modes are all split, namely, permeable template cloth is used in the pouring process, and then reagents such as reinforcing agents or hardening agents are coated or sprayed after hardening and demoulding, so that the discontinuous construction process brings inconvenience to the construction organization on site.
Disclosure of Invention
In order to solve the defects of the prior art, the first purpose of the invention is to provide a brand-new concrete protection layer reinforcing material.
The second object of the present invention is to provide a reinforcing slurry containing the concrete protective layer reinforcing material.
The third objective of the invention is to provide a composite formwork cloth containing a reinforcing material, which aims to realize synchronous reinforcement in the concrete setting and hardening process and improve the performance of the concrete through the combined control of the structure and the components.
The fourth purpose of the invention is to provide a preparation method of the composite template cloth.
The fifth purpose of the invention is to provide a method for reinforcing a concrete protection layer by using the composite template cloth.
The existing concrete protective layer strengthening technology is mainly used for spraying strengthening components after concrete is solidified and hardened to carry out surface penetration strengthening. The concrete protection effect of the technology is limited; in order to overcome the defects in the prior art, the invention provides a concrete protective layer reinforcing material which comprises silica sol, nano-silica and magnesium fluosilicate.
The research of the invention finds that through the synergistic effect among the components of the reinforcing material, the pozzolanic activity of C-S-H gel generated by the reaction of nano-silica and calcium hydroxide in silica sol and the enhancement effect of hydrolysis reaction of magnesium fluosilicate can be exerted, and the physical filling effect of the nano-silica can be utilized to improve the pore structure of concrete and improve the compactness. Therefore, the synergistic effect of the materials can strengthen the concrete from both chemical and physical aspects; not only can effectively improve the strength, but also can unexpectedly reduce the diffusion coefficient of the chloride ions.
Preferably, the particle size of the nano silicon dioxide is 15-50 nm.
Preferably, the weight part of the silica sol is 35-60 parts, and more preferably 40-50 parts; the weight part of the nano silicon dioxide is 8-15 parts, and the preferable weight part is 10-12 parts; the weight part of the magnesium fluosilicate is 10-20 parts, and the preferable weight part is 13-15 parts. The preferred ratio contributes to further synergistic improvement in strength and also reduces the chlorine diffusion coefficient.
The invention also provides a concrete protective layer reinforcing slurry which comprises the concrete protective layer reinforcing material and water.
Preferably, the weight part of the water is 18-47 parts; more preferably 20 to 35 parts. That is, in the reinforcing material, the weight part of the silica sol is 35 to 60 parts; 8-15 parts of nano silicon dioxide and 10-20 parts of magnesium fluosilicate; the weight portion of the water is 18-47 portions. Further preferably, the reinforcing material comprises the following components in percentage by mass: silica sol: 35-60% (preferably 45-50%), nano silicon dioxide: 8-15% (preferably 10-12%), magnesium fluosilicate: 10-20% (preferably 13-15%), deionized water: 18-47% (preferably 20-35%). The reinforced materials can be uniformly mixed in a water bath environment at the temperature of 22 +/-2 ℃, and are stored in a shady and cool place in the shade.
The invention also provides a composite template cloth containing the reinforced material, which comprises a surface layer, a middle layer containing the reinforced material and a base layer;
the surface layer is a water-permeable and air-permeable material layer, and the aperture of the surface layer is 0.2-30 mu m;
the middle layer is a telescopic deformation material layer and contains a concrete strengthening material;
the pore diameter of the hydrophobic breathable material layer of the basic layer is 0.1-10 mu m.
Most of the existing ideas of concrete surface protection are to perform surface treatment and reinforcement after concrete is set and hardened. However, the invention innovatively realizes the effects of reducing surface honeycombs, pitted surfaces and sand holes of the traditional template cloth and the synchronous reinforcement in the concrete setting and hardening process for the first time in the industry through the combined control of each layer of material structure of the composite template cloth and the reinforcement material. Therefore, compared with the prior art, the method can obviously improve the surface aesthetic degree of the concrete, and can effectively improve the strength and durability of the concrete of the protective layer through the chemical reaction synchronous with the hydration process. In addition, compared with the prior art that only the surface can be strengthened and permeated, the composite template cloth with the structure can realize the strengthened and permeated of the strengthening material in the whole concrete, effectively improve the integrity and the strength of the concrete, and reduce the diffusion coefficient of chloride ions.
The surface layer is made of compact non-woven fabric with water-permeable and air-permeable micropores.
Preferably, the pore diameter of the fiber braided by the fiber with the diameter of 20-2000nm is 0.2-30 μm; preferably 20 to 30 μm. Non-woven fabric with thickness of 0.02-2.1 mm; preferably 0.8 to 1.2 mm.
The non-woven surface layer has the following characteristics:
1) allowing water, aqueous solution and reinforcer to permeate and the flocculent to not pass through;
2) allowing air in the concrete to permeate through.
The middle layer is a deformation material layer which is a material capable of compressing and deforming and releasing a composite concrete strengthening material; preferably a sponge layer; further preferably, the sponge has a density of 18-45kg/m3。
The intermediate layer containing the reinforcing material has the following characteristics:
1) the reinforcing material is particularly the concrete protective layer reinforcing material developed in the invention.
2) Before the concrete is poured after the template cloth is arranged on site, a reinforcing material (the reinforcing material is not particularly limited to the reinforcing material of the concrete protective layer in the invention, and various commercially available concrete reinforcing agents can be used) is injected into the middle layer (2), the reinforcing material can uniformly permeate into the whole middle layer (2) because the material adopted by the middle layer (2) is full, loose and porous, and the injection amount of the reinforcing material is adjusted according to the cement content in the concrete and the content of effective substances in the reinforcing material.
In the invention, the protective layer reinforcing material compounded in the middle layer can be a conventional commercially available material capable of reinforcing concrete, and is preferably the innovative concrete protective layer reinforcing material.
Further preferably, the intermediate layer is adsorbed by the reinforcing material of the present invention. The research of the invention unexpectedly discovers that the strength of concrete can be further improved synergistically by matching the composite template cloth structure with the reinforcing material, and the diffusion coefficient of chlorine can be further reduced unexpectedly.
The base layer is a hydrophobic polymer layer; the hydrophobic polymer is at least one of nylon, polyester, PP and PE.
Preferably, the pore structure of the base layer is 8 to 10 μm.
The invention also provides a preparation method of the composite template cloth containing the reinforced material, which is obtained by compounding the surface layer, the middle layer and the base layer.
In the invention, the intermediate layer can be obtained by directly compounding the deformation material and the reinforcing material, or the reinforcing material can be pulped by water to obtain reinforcing slurry and then injected into the reinforcing material of the intermediate layer to obtain the intermediate layer. The reinforcing material in the middle layer can be added before or after the surface layer and the base layer are compounded.
For example, the preparation method of the composite template cloth can be obtained by compounding the surface layer, the deformation material layer and the base layer and then injecting slurry containing a concrete strengthening material into the deformation material layer; or, the concrete reinforcing material is injected into the middle deformation material layer in advance, and then the concrete reinforcing material is compounded with the surface layer and the base layer.
The invention also provides a method for reinforcing the concrete protective layer (namely an application method of the composite template cloth), and the surface layer of the composite template cloth is covered on the surface of newly poured concrete.
The concrete protective layer strengthening method provided by the invention innovatively uses the composite template cloth, can realize the synchronization of gelatinization and strengthening, can effectively shorten the construction process, has a good strengthening effect on the protective layer concrete, improves the attractiveness, mechanical property and durability of the reinforced concrete structure, and can be used for 1-3 times in a circulating manner.
In addition, the surface strengthening of the invention can realize the functions of reducing the defects of honeycombs, pitted surfaces, sand holes, cracks and the like, improving the surface aesthetic degree of concrete and improving the durability of the existing template cloth by only one process in a construction site thanks to the combined use of the composite template cloth and the strengthening material, and because the strengthening material is migrated into the concrete when the concrete is poured by adopting the method, the depth can almost cover the depth of the whole protecting layer, and compared with brushing or spraying the strengthening agent after hardening, the invention can play a better protecting layer strengthening effect.
Preferably, the base layer of the composite formwork cloth is in contact with a concrete poured formwork.
Preferably, the method for reinforcing the concrete protection layer comprises the steps of compounding the base layer of the composite formwork cloth on the inner wall of the formwork, and then pouring concrete.
According to the reinforcing method, the surface layer is positioned on the surface layer contacted with the newly poured concrete; the base layer is arranged on the bottom layer which is bonded with the template layer for construction; the intermediate layer containing the reinforcing material is intermediate the surface layer and the base layer (as shown in fig. 1).
Advantageous effects
1. The invention provides a brand-new concrete protective layer reinforcing material, which can effectively improve the pores of protective layer concrete under low doping amount by combined use of silica sol, nano silicon dioxide and magnesium fluosilicate, improve the impermeability, improve the strength and reduce the diffusion coefficient of chloride ions so as to improve the mechanical property and the durability.
2. The invention provides composite template cloth with a brand-new structure and material components, which is innovatively used, can initiatively realize synchronous gelatinization and reinforcement, and can obviously improve the reinforcement effect of a protective layer.
(1) The uniformly distributed fibers and micron-level pore diameters on the surface layer of the non-woven fabric can ensure that the surface of concrete is smoother and more compact, effectively reduce the defects of honeycombs, pitted surfaces, sand holes, cracks and the like, reduce chromatic aberration, improve the surface attractiveness and simultaneously effectively prevent micron-level gelled material particles and flocculent hydration products from permeating or blocking micropores;
(2) the waterproof base layer material ensures that the water in the reinforcing material and the concrete cannot be lost, so that the waterproof base layer material and the loose and porous deformation material intermediate layer play a role in containing water and moisturizing together, and continuous moisturizing and curing are provided for the surface concrete, so that the hydration degree is improved, and the curing period is shortened.
(3) The excess moisture in the concrete can permeate into the middle layer along with the pouring, meanwhile, the pressure of the concrete on the template is increased, the middle layer is extruded, the enhancer contained in the concrete is mixed with the excess moisture in the concrete and then migrates towards the concrete, and the reinforcing material and the concrete are physically and mechanically mixed in the vibrating process, so that the migration depth can cover the whole protective layer and participate in the hydration process of the cement, and the excellent protective layer reinforcing effect is achieved.
3. The method scientifically and effectively combines two construction procedures of firstly using the template cloth to improve the attractiveness of the surface of the concrete, hardening and removing the template and then coating or spraying the reinforcing agent into one procedure, greatly shortens the construction period and is particularly suitable for pouring and maintaining high-performance concrete.
Drawings
FIG. 1 is a schematic view of a template cloth containing reinforcing material used in the present invention; a-a concrete layer; b-steel, wood or bamboo formwork; 1- -a surface layer; 2- -an intermediate layer; 3- -base layer.
FIG. 2 is a schematic view of water infiltration and water and reinforcement migration during casting;
Detailed Description
For the template cloth containing the reinforcing material in the reinforcing method of the concrete protective layer material, the reinforcing material is added in the following manner:
after the template cloth is arranged on site and before concrete is poured, the reinforced material is injected from the top of the middle layer, and the material adopted by the middle layer is full, loose and porous, so that the reinforced material can uniformly penetrate into the whole middle layer (the reinforced material is not particularly limited to the reinforced material of the concrete protective layer in the invention, and various commercially available concrete reinforcing agents can also be used).
The mixing amount of the reinforcing material in the intermediate layer is adjusted according to the cement content in the concrete and the content of the effective substances in the reinforcing material.
The use method of the invention comprises the following steps:
1. cleaning sundries on a template (steel, wood, bamboo and the like) which is planned to be used in concrete construction;
2. calculating the size of a template to be used for concrete pouring construction, and reserving 30-50mm of template cloth according to the template structure;
3. uniformly brushing or spraying water-soluble glue on the template finished in the step (1), and then flattening the template cloth which is calculated and cut in the step (2) to obtain a cloth spread on the template;
4. uniformly injecting a reinforcing material into the top end surface of the middle layer, wherein the dosage of the reinforcing material is adjusted according to the cement content in the concrete and the content of effective substances in the reinforcing material;
5. connecting the template and the template cloth into a whole by using a proper fixing clamp according to the template condition;
6. pouring is carried out according to the concrete construction process required in the current specification.
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention, and all similar structures and methods and similar variations used herein are intended to be encompassed by the present invention.
In the following cases, the materials used were, except as specifically stated:
silica sol: HUIHONG nanometer science and technology limited S-830 with average particle diameter of 7-12 nm;
nano silicon dioxide: AEROSIL 200, 800 mesh;
magnesium fluosilicate: wengjiang reagent 16949-65-8, analytically pure AR 99%.
Blank control
No reinforcing material is used, and no formwork cloth is used for pouring concrete.
Example 1
Respectively made of water-permeable and air-permeable non-woven fabric and water-repellent non-woven fabric produced by Jusheng companyMaking a surface layer and a base layer, wherein the thickness of the water-permeable and air-permeable non-woven fabric is 0.9mm, the aperture is 30 mu m, the aperture thickness of the water-repellent non-woven fabric is 0.1mm, and the aperture is 10 mu m; the middle layer of the adopted deformation material is produced by Yuanyuan company and has the density of 22kg/m3The K324 sponge is wound and finally compounded to obtain the composite template cloth.
The concrete protective layer reinforcing material (reinforcing slurry) comprises the following substances in percentage by mass: silica sol: 45%, nano-silica: 10%, magnesium fluosilicate: 13%, deionized water: 32 percent and is uniformly mixed by a magnetic stirrer in a water bath environment at 22 +/-2 ℃, and the dosage is 5 percent of the mass of the cement.
Example 2
Respectively adopting a water-permeable and air-permeable non-woven fabric and a water-repellent non-woven fabric produced by Jusheng company to manufacture a surface layer and a base layer, wherein the water-permeable and air-permeable non-woven fabric has the thickness of 0.9mm and the aperture of 30 mu m, and the water-repellent non-woven fabric has the aperture thickness of 0.1mm and the aperture of 10 mu m; the middle layer of the adopted deformation material is produced by Yuanyuan company and has the density of 22kg/m3The K324 sponge is wound and finally compounded to obtain the composite template cloth.
The concrete protective layer reinforcing material (slurry) comprises the following substances in percentage by mass: silica sol: 50%, nano-silica: 12%, magnesium fluosilicate: 15%, deionized water: 23 percent and is uniformly mixed by a magnetic stirrer in a water bath environment at 22 +/-2 ℃, and the dosage is 5 percent of the mass of the cement.
Example 3
The composite template cloth structure provided by the invention is matched with the conventional reinforcing agent, and specifically comprises the following components:
respectively adopting a water-permeable and air-permeable non-woven fabric and a water-repellent non-woven fabric produced by Jusheng company to manufacture a surface layer and a base layer, wherein the water-permeable and air-permeable non-woven fabric has the thickness of 0.9mm and the aperture of 30 mu m, and the water-repellent non-woven fabric has the aperture thickness of 0.1mm and the aperture of 10 mu m; the middle layer of the adopted deformation material is produced by Yuanyuan company and has the density of 22kg/m3The K324 sponge is wound and finally compounded to obtain the composite template cloth.
The surface reinforcing agent TR-HNTBMZQ of the commercially available Anhui Tairun concrete is adopted, and the dosage is 0.8kg/m2。
Example 4
The composite template cloth of the invention is not adopted, and only the existing single template cloth (only the surface layer template cloth) is adopted, and the method specifically comprises the following steps:
a commercially available Dayu permeable template cloth was used, the layer pore size of which was 35 μm. The concrete protective layer reinforcing material (slurry) comprises the following substances in percentage by mass: silica sol: 45%, nano-silica: 10%, magnesium fluosilicate: 13%, deionized water: 32 percent and is uniformly mixed by a magnetic stirrer in a water bath environment at 22 +/-2 ℃, and the dosage is 5 percent of the mass of the cement.
Comparative example 1
As comparative example 1, a commercially available Dayu permeable template cloth was used, and the pore size of the filter layer of the product was 35 μm. The template cloth is only used independently, and the use method is known in the industry: for example: the using method comprises the following steps: firstly, cleaning a template, then cutting template cloth into required sizes, then uniformly spraying glue on the template, and finally pasting the template cloth.
Comparative example 2
The reinforcing agent is used alone without using a template cloth. The reinforcing agent is TR-HNTBMZQ which is a surface reinforcing agent for the Ant-wet concrete of Anhui province, and the reference amount of brushing or spraying after setting and hardening is 0.3-1 kg/m2The penetration depth is 3-10 mm.
Comparative example 3
Respectively adopting a water-permeable and air-permeable non-woven fabric and a water-repellent non-woven fabric produced by Jusheng company to manufacture a surface layer and a base layer, wherein the water-permeable and air-permeable non-woven fabric has the thickness of 0.9mm and the aperture of 30 mu m, and the water-repellent non-woven fabric has the aperture thickness of 0.1mm and the aperture of 10 mu m; the middle layer of the adopted deformation material is produced by Yuanyuan company and has the density of 22kg/m3The K324 sponge is wound and finally compounded to obtain the composite template cloth.
And (3) performance testing:
(1) concrete surface improving effect
The test method comprises the following steps: examples 1, 2, 3, 4 and comparative examples 1, 2, 3 were applied separately, and the surface condition of the concrete after use was observed.
(2) Chloride ion penetration resistance test
The test method comprises the following steps: referring to GB/T50082-2009 standard chapter 7 of test method for long-term performance and durability of common concrete, the smaller the numerical value is, the higher the compactness of the concrete is, and the better the durability is.
(3) Test of concrete compressive Strength
The test method comprises the following steps: reference GBT 50081-2019 concrete physical and mechanical property test method standard Chapter 5.
Raw material
(1) Cement: P.O 42.5.5, south east lake, ltd; (2) sand: medium sand with good gradation; (3) coarse aggregate: mixing 2 grades of limestone broken stones with the grain sizes of 5-10 mm and 10-20 mm respectively; (4) water: tap water from Changsha; (5) water reducing agent: wuhangerelin SP010 polycarboxylic acid water reducing agent.
| Cement | Sand | 5-10 mm stone | 10-20 mm stone | Water (W) | Water reducing agent |
| 432 | 695 | 340 | 795 | 324 | 6.24 |
TABLE 1 concrete mix proportion (unit kg/m)3)
The results of the experiment are shown in the following table:
the experimental data show that the reinforced material and the composite template structure are both beneficial to improving the performance of concrete, and the reinforced material and the composite template structure are combined to bring synergistic performance.
The innovative material is matched with the structure of the innovative composite template cloth, so that the cooperation is facilitated, the strength is improved, and the chlorine diffusion coefficient is reduced.
Claims (14)
1. A concrete protective layer reinforcing material is characterized by comprising silica sol, nano silicon dioxide and magnesium fluosilicate;
wherein, the weight portion of the silica sol is 35 to 60 portions; 8-15 parts of nano silicon dioxide and 10-20 parts of magnesium fluosilicate.
2. A composite form work comprising the reinforcing material of claim 1, comprising a surface layer, an intermediate layer comprising the reinforcing material, and a base layer;
the surface layer is a water-permeable and air-permeable material layer, and the aperture of the surface layer is 0.2-30 mu m;
the middle layer is a telescopic deformation material layer and contains the concrete strengthening material of claim 1;
the pore diameter of the hydrophobic breathable material layer of the basic layer is 0.1-10 mu m.
3. The composite form work incorporating the reinforcement material of claim 2, wherein the surface layer is a dense nonwoven fabric with water-permeable, air-permeable pores.
4. The composite form work containing reinforcing material as claimed in claim 3, wherein said surface layer is a non-woven fabric having a pore size of 0.2 to 30 μm and a thickness of 0.02 to 2.1 mm.
5. The composite formwork fabric comprising reinforcement material of claim 2, wherein the base layer is a hydrophobic polymer layer; wherein, the hydrophobic polymer is at least one of nylon, polyester, PP and PE.
6. The composite form work cloth containing reinforcing material of claim 2, wherein the layer of deformable material is a material that can compressively deform and release the composite concrete reinforcing material.
7. The composite form work sheet containing reinforcing material as claimed in claim 6, wherein said layer of deformable material is a sponge layer.
8. The composite form work incorporating reinforcement according to claim 7, wherein said sponge has a density of 18 to 45kg/m3。
9. The composite form work cloth containing reinforcing material according to any one of claims 2 to 8, wherein the intermediate layer is adsorbed with reinforcing slurry;
the reinforced slurry comprises the concrete protective layer reinforced material and water;
wherein the weight part of the water is 18-47 parts.
10. The method for preparing the composite formwork cloth containing the reinforcing material as claimed in any one of claims 2 to 9, wherein the surface layer, the intermediate layer and the base layer are compounded.
11. A method for reinforcing a concrete protection layer, characterized in that the surface layer of the composite form cloth according to any one of claims 2 to 9 is covered on the newly poured concrete surface.
12. A method of reinforcing a concrete protective layer as claimed in claim 11, wherein the base layer of the composite formwork cloth is in contact with a concrete cast formwork.
13. The method for reinforcing a concrete protective layer according to claim 11, wherein the base layer of the composite form cloth is adhered to the inner wall of the form, and then the concrete is poured.
14. A concrete protective layer reinforcing slurry comprising the concrete protective layer reinforcing material according to claim 1 and water;
wherein the weight part of the water is 18-47 parts.
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