CN115340344A - Fiber-doped modified light foam concrete for buildings and preparation method thereof - Google Patents
Fiber-doped modified light foam concrete for buildings and preparation method thereof Download PDFInfo
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- 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
- C04B28/10—Lime cements or magnesium oxide cements
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- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
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- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
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- C04B14/38—Fibrous materials; Whiskers
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Abstract
The invention discloses fiber-doped modified light foam concrete for buildings and a preparation method thereof, belonging to the technical field of building materials. The foam concrete of the invention is prepared from the following raw materials in parts by weight: 200-400 parts of cement, 50-80 parts of auxiliary materials, 10-20 parts of fly ash, 80-120 parts of water, 10-20 parts of foaming agent, 10-20 parts of modified glass fiber, 10-20 parts of redispersible latex powder, 5-10 parts of water reducing agent and 0.1-0.5 part of dispersing agent. The compressive strength of the obtained foam concrete test piece 28d can reach 5MPa, the water absorption rate is about 7-8%, the concrete performance is stable, the strength is high, and the market requirements can be completely met. According to the invention, the raw materials act together, the property advantages of various raw material components are cooperatively exerted, a good cooperative enhancement effect is realized, and the strength performance and stability of the foam concrete are jointly improved greatly.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to fiber-doped modified light foam concrete for buildings and a preparation method thereof.
Background
The light concrete is a composite material with low density, light dead weight, good heat preservation and good earthquake resistance, and can better make up the defects that the common concrete is easy to generate brittle failure and the like due to higher mechanical property and economic benefit. In the building engineering, the use of the lightweight concrete can reduce the proportion of reinforcing steel bars and the dead weight of the structure, save the engineering cost and improve the response of the earthquake structure. Therefore, the lightweight concrete is widely applied to heavy structural engineering such as long-span bridge engineering, high-rise building laminated slabs and the like, and various other engineering such as tunnels, water conservancy and hydropower, underground spaces and the like.
Lightweight concrete is mainly classified into porous concrete (foam concrete, aerated concrete, etc.) and lightweight aggregate concrete (polystyrene particle foam concrete, hollow glass bead concrete, ceramsite concrete, etc.). Foam concrete is one of the light concrete which is researched and applied at the earliest, and 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 machine, uniformly mixing foam and cement slurry, then performing cast-in-place construction or mold forming through a pumping system and performing natural curing.
The Chinese patent with the application number of 2016101764882 discloses a foam concrete, which is prepared by preparing an intermediate slurry from 50-60 parts by weight of water, 120-150 parts by weight of cement, 0.8-1.5 parts by weight of anti-crack fiber, 0.9-1.2 parts by weight of anti-crack agent, 6-10 parts by weight of fly ash and 0.6-1.2 parts by weight of redispersible latex powder, wherein the intermediate slurry in unit volume is uniformly mixed with 0.4-0.8 volume of polyphenyl particles and 0.8-1.2 volume of foaming bubbles; the foam concrete provided by the invention has the advantages of light weight, high strength, good heat preservation effect, capability of reducing the thickness of a wall body and material saving effect.
However, in the prior art, fiber-doped foam concrete has a large number of closed pores, so that the heat insulation performance is improved greatly, but the problems of poor bonding force between fibers and a matrix material, insufficient bonding degree, concrete strength reduction, stability and durability reduction and the like exist.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the glass fiber-doped foam concrete, which greatly improves the bonding force of fibers and a gel material, improves the overall strength performance, stability and corrosion resistance of the concrete, improves the comprehensive performance of the foam concrete and expands the application range of the foam concrete.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the fiber-doped modified light foam concrete for the building is prepared from the following raw materials in parts by weight: 200-400 parts of cement, 50-80 parts of auxiliary materials, 10-20 parts of fly ash, 80-120 parts of water, 10-20 parts of foaming agent, 10-20 parts of modified glass fiber, 10-20 parts of redispersible latex powder, 5-10 parts of water reducing agent and 0.1-0.5 part of dispersing agent.
Further, the cement is portland cement and/or sulphoaluminate cement.
Further, the auxiliary materials are formed by mixing clay, lime powder and silica fume according to a mass ratio of 30-50.
Further, the foaming agent is one or a combination of cocoamidopropyl betaine, hydrogen peroxide or sodium dodecyl sulfate.
Further, the preparation method of the modified glass fiber comprises the following steps:
(1) Ultrasonic cleaning the glass fiber with deionized water and anhydrous ethanol for 10-20min, and air drying; soaking the glass fiber in 30 wt% of H 2 O 2 Putting the solution into a hydrothermal kettle, treating for 1-2h at 70-80 ℃, and drying for later use to obtain pretreated glass fiber;
(2) Soaking 5g of pretreated glass fiber in 40-50mL of ethanol solution, adding 5-8mL of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 45-50mL of ethanol, adding 2-4mL of deionized water and 0.1-0.3mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring at room temperature for 30-60min, aging at 70 ℃ for 3-5h, filtering, and fully drying to obtain the modified glass fiber.
Further, the water reducing agent is at least one of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent and a fatty acid water reducing agent.
Further, the dispersing agent is one or more of fatty alcohol-polyoxyethylene ether, alpha-sodium alkenyl sulfonate, sodium dodecyl sulfate and triterpenoid saponin.
A preparation method of fiber-doped modified light foam concrete for buildings comprises the following steps:
(1) Preparing modified glass fiber: sequentially ultrasonically cleaning the glass fiber for 10-20min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30 wt% of H 2 O 2 Putting the solution into a hydrothermal kettle, treating the solution for 1 to 2 hours at the temperature of between 70 and 80 ℃, and drying the solution for later use to obtain pretreated glass fibers; soaking 5g of pretreated glass fiber in 40-50mL of ethanol solution, adding 5-8mL of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 45-50mL of ethanol, adding 2-4mL of deionized water and 0.1-0.3mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring at room temperature for 30-60min, aging at 70 ℃ for 3-5h, filtering, and fully drying to obtain modified glass fiber;
(2) Putting cement, auxiliary materials, fly ash, water, modified glass fiber, redispersible latex powder, a water reducing agent and a dispersing agent into a container according to the parts by weight, uniformly stirring by using a stirrer, pouring a foaming agent for mixing, uniformly stirring, and maintaining to obtain the foam concrete.
Further, the curing conditions in the preparation method are as follows: curing at room temperature for 7 days under the relative humidity of more than 50 percent.
The use of fiber to enhance the strength of concrete is a technical means adopted in the industry, and the fiber can play a role in crack resistance, reinforcement, toughening and the like in cement-based materials. And the fiber is added into the concrete, so that the phenomena of poor fusion with the concrete, unobvious strength improvement and even no obvious improvement exist.
The invention adopts the glass fiber as the main reinforcing and toughening material, removes the surface passivation layer through hydrogen peroxide etching, improves the wettability, improves the interface adhesion and the hydrophilicity with the inorganic coating, simultaneously promotes the adsorption of the next step of nano silicon dioxide particles through the modification, thereby improving the cohesiveness and the matrix strength, and thus, the two materials have synergistic effect, can effectively divide bubbles, and ensure that the pores of the bubbles are smaller, the sizes of the bubbles are closer and the bubbles are more uniformly distributed. The concrete foaming agent is mutually overlapped to form a stable structure with three-dimensional network distribution in the concrete foaming process, plays a role in supporting slurry, prevents the slurry from collapsing, effectively protects bubbles from being broken in the slurry hardening process, and can form closed air holes, thereby improving the hole structure.
Advantageous effects
The method for preparing the light foamed concrete can well give consideration to the matching relationship among various raw material components, so that the comprehensive performance of the foamed concrete is better and excellent. By adding the fiber material and performing two-step modification, on one hand, the stability of the foam concrete is improved, and on the other hand, the strength is greatly increased;
in addition, the redispersible emulsion powder is water-soluble redispersible powder, has high film forming performance, can obviously improve the aspects such as the water resistance, plasticity, flexibility and the like of concrete, forms an induction action on air after being added in the preparation process of the foam concrete, enables the concrete to have an air entraining effect, can also form a polymer film on the surface of the foam concrete and become a part of a hole wall, increases the cohesive force, and improves the capabilities of resisting stress and strain damage;
the fly ash and the slag are fully contacted with other raw material particles in the preparation process of the foam concrete, so that the compactness among the concrete particles is improved, the prepared concrete structure is more densified, the stability of the concrete is greatly improved, the segregation phenomenon in the pouring and transporting processes is inhibited, and the hardened foam concrete structure is stable and has excellent strength performance through hydration reaction;
the addition of the dispersing agent and the like has good dispersibility, heat-resistant stability and high-temperature dispersibility, and the grinding aid has good grinding effect, and can also obviously increase the roughness of water solution molecules and the strength of the surface of a liquid film, delay the cracking time of the liquid film and improve the stability of foam in foam concrete.
According to the invention, the raw materials act together, the property advantages of various raw material components are cooperatively exerted, a good cooperative enhancement effect is realized, and the strength performance and stability of the foam concrete are greatly improved together.
Drawings
FIG. 1 is a cross-sectional profile of a test piece in example 4 of the present invention;
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments, but is not limited thereto.
Example 1
The fiber-doped modified light foam concrete for the building is prepared from the following raw materials in parts by weight: 200 parts of cement, 50 parts of auxiliary materials, 10 parts of fly ash, 80 parts of water, 10 parts of foaming agent, 10 parts of modified glass fiber, 10 parts of redispersible latex powder, 5 parts of water reducing agent and 0.1 part of dispersing agent.
The cement is portland cement.
The auxiliary materials are formed by mixing clay, lime powder and silica fume according to a mass ratio of 30.
The foaming agent is cocamidopropyl betaine.
The preparation method of the modified glass fiber comprises the following steps:
(1) Sequentially ultrasonically cleaning glass fibers for 10min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30% by weight of H 2 O 2 Putting the solution into a hydrothermal kettle, treating the solution for 1 hour at 70-80 ℃, and drying the solution for later use to obtain pretreated glass fibers;
(2) Soaking 5g of pretreated glass fiber in 40ml of ethanol solution, adding 5ml of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 45mL of ethanol, adding 2mL of deionized water and 0.1mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring for 30min at room temperature, aging for 3h at 70 ℃, filtering, and fully drying to obtain the modified glass fiber.
The water reducing agent is a polycarboxylic acid water reducing agent.
The dispersing agent is fatty alcohol-polyoxyethylene ether.
A preparation method of fiber-doped modified light foam concrete for buildings comprises the following steps:
(1) Preparation of modified glass fibers: sequentially ultrasonically cleaning the glass fiber for 20min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30 wt% of H 2 O 2 Putting the solution into a hydrothermal kettle, treating for 1h at 70-80 ℃, and drying for later use to obtain pretreated glass fiber; soaking 5g of pretreated glass fiber in 40mL of ethanol solution, adding 5mL of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 45mL of ethanol, adding 2mL of deionized water and 0.1mL of LHCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring for 30min at room temperature, aging for 3h at 70 ℃, filtering, and fully drying to obtain modified glass fiber;
(2) Placing cement, auxiliary materials, fly ash, water, modified glass fiber, redispersible latex powder, a water reducing agent and a dispersing agent into a container according to the parts by weight, pouring a foaming agent into the container to mix the materials after uniformly stirring the materials by a stirrer, and curing the materials after uniformly stirring the materials to obtain the foam concrete.
The curing conditions in the preparation method are as follows: curing for 7 days at room temperature under the relative humidity of more than 50 percent.
Example 2
The fiber-doped modified light foam concrete for the building is prepared from the following raw materials in parts by weight: 300 parts of cement, 60 parts of auxiliary materials, 15 parts of fly ash, 90 parts of water, 12 parts of foaming agent, 14 parts of modified glass fiber, 14 parts of redispersible latex powder, 6 parts of water reducing agent and 0.2 part of dispersing agent.
The cement is sulphoaluminate cement.
The auxiliary materials are formed by mixing clay, lime powder and silica fume according to a mass ratio of 40.
The foaming agent is hydrogen peroxide.
The preparation method of the modified glass fiber comprises the following steps:
(1) Sequentially ultrasonically cleaning glass fibers for 10min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30% by weight of H 2 O 2 Putting the solution into a hydrothermal kettle, treating the solution for 2 hours at the temperature of between 70 and 80 ℃, and drying the solution for later use to obtain pretreated glass fibers;
(2) Soaking 5g of pretreated glass fiber in 40ml of ethanol solution, adding 5ml of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 50mL of ethanol, adding 4mL of deionized water and 0.1mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring at room temperature for 40min, aging at 70 ℃ for 4h, filtering, and fully drying to obtain the modified glass fiber.
The water reducing agent is a naphthalene water reducing agent.
The dispersant is alpha-sodium alkenyl sulfonate.
A preparation method of fiber-doped modified light foam concrete for buildings comprises the following steps:
(1) Preparing modified glass fiber: sequentially ultrasonically cleaning glass fibers for 10min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30% by weight of H 2 O 2 Putting the solution into a hydrothermal kettle, treating the solution for 2 hours at the temperature of between 70 and 80 ℃, and drying the solution for later use to obtain pretreated glass fibers; soaking 5g of pretreated glass fiber in 40ml of ethanol solution, adding 5ml of TEOS, and uniformly stirring to obtain a mixed solution A; weighing 50mL of ethanol, adding 4mL of deionized water and 0.1mL of LHCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring at room temperature for 40min, aging at 70 ℃ for 4h, filtering, and fully drying to obtain modified glass fiber;
(2) Putting cement, auxiliary materials, fly ash, water, modified glass fiber, redispersible latex powder, a water reducing agent and a dispersing agent into a container according to the parts by weight, uniformly stirring by using a stirrer, pouring a foaming agent for mixing, uniformly stirring, and maintaining to obtain the foam concrete.
The curing conditions in the preparation method are as follows: curing for 7 days at room temperature under the relative humidity of more than 50 percent.
Example 3
The fiber-doped modified light foam concrete for the building is prepared from the following raw materials in parts by weight: 350 parts of cement, 70 parts of auxiliary materials, 15 parts of fly ash, 110 parts of water, 15 parts of foaming agents, 17 parts of modified glass fibers, 18 parts of redispersible latex powder, 8 parts of water reducing agents and 0.3 part of dispersing agents.
The cement is portland cement.
The auxiliary materials are clay, lime powder and silica fume according to a mass ratio of 50: 5, mixing the components.
The foaming agent is sodium dodecyl sulfate.
The preparation method of the modified glass fiber comprises the following steps:
(1) Sequentially ultrasonically cleaning the glass fiber for 20min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30% by weight of H 2 O 2 Putting the solution into a hydrothermal kettle, treating the solution for 2 hours at the temperature of between 70 and 80 ℃, and drying the solution for later use to obtain pretreated glass fibers;
(2) Soaking 5g of pretreated glass fiber in 50ml of ethanol solution, adding 8ml of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 50mL of ethanol, adding 4mL of deionized water and 0.3mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring for 60min at room temperature, aging for 5h at 70 ℃, filtering, and fully drying to obtain the modified glass fiber.
The water reducing agent is a polycarboxylic acid water reducing agent.
The dispersant is triterpenoid saponin.
A preparation method of fiber-doped modified light foam concrete for buildings comprises the following steps:
(1) Preparing modified glass fiber: sequentially ultrasonically cleaning the glass fiber for 20min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30 wt% of H 2 O 2 Putting the solution into a hydrothermal kettle, treating for 2 hours at 70-80 ℃, and drying for later use to obtain pretreated glass fiber; soaking 5g of pretreated glass fiber in 50mL of ethanol solution, adding 8mL of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 50mL of ethanol, adding 4mL of deionized water and 0.3mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring for 60min at room temperature, aging for 5h at 70 ℃, filtering, and fully drying to obtain modified glass fiber;
(2) Placing cement, auxiliary materials, fly ash, water, modified glass fiber, redispersible latex powder, a water reducing agent and a dispersing agent into a container according to the parts by weight, pouring a foaming agent into the container to mix the materials after uniformly stirring the materials by a stirrer, and curing the materials after uniformly stirring the materials to obtain the foam concrete.
The curing conditions in the preparation method are as follows: curing for 7 days at room temperature under the relative humidity of more than 50 percent.
Comparative example 1
The fiber-doped modified light foam concrete for the building is prepared from the following raw materials in parts by weight: 350 parts of cement, 70 parts of auxiliary materials, 15 parts of fly ash, 110 parts of water, 15 parts of foaming agents, 17 parts of modified glass fibers, 18 parts of redispersible latex powder, 8 parts of water reducing agents and 0.3 part of dispersing agents.
The cement is portland cement.
The auxiliary materials are clay, lime powder and silica fume according to a mass ratio of 50: 5, mixing the components.
The foaming agent is sodium dodecyl sulfate.
The preparation method of the modified glass fiber comprises the following steps:
(1) Soaking 5g of glass fiber in 50mL of ethanol solution, adding 8mL of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 50mL of ethanol, adding 4mL of deionized water and 0.3mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring for 60min at room temperature, aging for 5h at 70 ℃, filtering, and fully drying to obtain the modified glass fiber.
The water reducing agent is a polycarboxylic acid water reducing agent.
The dispersant is triterpenoid saponin.
A preparation method of fiber-doped modified light foam concrete for buildings comprises the following steps:
(1) Preparing modified glass fiber: soaking 5g of glass fiber in 50ml of ethanol solution, adding 8ml of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 50mL of ethanol, adding 4mL of deionized water and 0.3mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring for 60min at room temperature, aging for 5h at 70 ℃, filtering, and fully drying to obtain modified glass fiber;
(2) Placing cement, auxiliary materials, fly ash, water, modified glass fiber, redispersible latex powder, a water reducing agent and a dispersing agent into a container according to the parts by weight, pouring a foaming agent into the container to mix the materials after uniformly stirring the materials by a stirrer, and curing the materials after uniformly stirring the materials to obtain the foam concrete.
The curing conditions in the preparation method are as follows: curing for 7 days at room temperature under the relative humidity of more than 50 percent.
The comparative example is the same as example 4 except that the first step of hydrogen peroxide modification of the glass fiber is not carried out.
Comparative example 2
The fiber-doped modified light foam concrete for the building is prepared from the following raw materials in parts by weight: 350 parts of cement, 70 parts of auxiliary materials, 15 parts of fly ash, 110 parts of water, 15 parts of foaming agents, 17 parts of modified glass fibers, 18 parts of redispersible latex powder, 8 parts of water reducing agents and 0.3 part of dispersing agents.
The cement is portland cement.
The auxiliary materials are clay, lime powder and silica fume according to a mass ratio of 50: 5, mixing the components.
The foaming agent is sodium dodecyl sulfate.
The preparation method of the modified glass fiber comprises the following steps:
(1) Sequentially ultrasonically cleaning the glass fiber for 20min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30 wt% of H 2 O 2 Adding the solution into a hydrothermal kettle, treating at 70-80 deg.C for 2 hr, and drying to obtain modified glass fiber
The water reducing agent is a polycarboxylic acid water reducing agent.
The dispersant is triterpenoid saponin.
A preparation method of fiber-doped modified light foam concrete for buildings comprises the following steps:
(1) Preparing modified glass fiber: sequentially ultrasonically cleaning glass fibers for 20min by using deionized water and absolute ethyl alcohol respectively, and airing for later use; soaking the glass fiber in 30 wt% of H 2 O 2 Putting the solution into a hydrothermal kettle, treating the solution for 2 hours at the temperature of between 70 and 80 ℃, and drying the solution for later use to obtain modified glass fibers;
(2) Putting cement, auxiliary materials, fly ash, water, modified glass fiber, redispersible latex powder, a water reducing agent and a dispersing agent into a container according to the parts by weight, uniformly stirring by using a stirrer, pouring a foaming agent for mixing, uniformly stirring, and maintaining to obtain the foam concrete.
The curing conditions in the preparation method are as follows: curing for 7 days at room temperature under the relative humidity of more than 50 percent.
This comparative example is similar to example 4 in the parts of the raw materials and the preparation method except that the second modification of the glass fiber is not performed.
Comparative example 3
The fiber-doped modified light foam concrete for the building is prepared from the following raw materials in parts by weight: 350 parts of cement, 70 parts of auxiliary materials, 15 parts of fly ash, 110 parts of water, 15 parts of foaming agents, 17 parts of glass fibers, 18 parts of redispersible latex powder, 8 parts of water reducing agents and 0.3 part of dispersing agents.
The cement is portland cement.
The auxiliary materials are clay, lime powder and silica fume according to a mass ratio of 50: 5, mixing the components.
The foaming agent is sodium dodecyl sulfate.
The water reducing agent is a polycarboxylic acid water reducing agent.
The dispersant is triterpenoid saponin.
A preparation method of fiber-doped modified light foam concrete for buildings comprises the following steps:
(1) Putting cement, auxiliary materials, fly ash, water, modified glass fiber, redispersible latex powder, a water reducing agent and a dispersing agent into a container according to the parts by weight, uniformly stirring by using a stirrer, pouring a foaming agent for mixing, uniformly stirring, and maintaining to obtain the foam concrete.
The curing conditions in the preparation method are as follows: curing at room temperature for 7 days under the relative humidity of more than 50 percent.
This comparative example was the same as example 4 except that the glass fibers were not modified, that is, the glass fibers were used as they were, and the other raw materials and the preparation method were the same.
Performance testing
The foam concrete obtained in the examples 1 to 4 and the comparative examples 1 to 3 of the invention are respectively prepared into test pieces, the 28 d-age compressive strength, dry apparent density and water absorption of the foam concrete are detected according to JC/T1062-2007 foam concrete block and GB/T11969-2008 autoclaved aerated concrete performance test method, and the porosity is measured: and (3) measuring the true density of the test piece after the dry density is measured according to GB/T208-1994, and then according to the formula: porosity = (true density-dry density)/true density × 100% calculation. Each test group was replicated three times. And observing the appearance of the section by a scanning electron microscope.
The test results are shown in table 1:
TABLE 1 Performance test results
As can be seen from the data in the table, the compressive strength of the foam concrete test piece 28d obtained in the embodiment of the invention can reach 5MPa, the water absorption rate is about 7-8%, and the prepared concrete has stable performance and high strength and can completely meet the market requirements. The comparative examples 1 to 3 in which the modification and addition modes of the glass fiber were changed showed various performance reductions in different degrees, because the bonding force between the fiber and the gel material and the subsequent silica was weakened without the first modification, and the strength reduction also occurred due to the uneven dispersion of the glass fiber without the second modification, which supplemented the two modifications. Therefore, the selection of raw materials and the preparation process in each step of the invention are organic and integrated, the effect is weak in the absence of one raw material, the raw material processes supplement each other, and the improvement of the strength performance of the foam concrete is realized together. As can also be seen from the SEM image of the section morphology of the test piece in the embodiment 4 of the invention, the fibers are well combined with the matrix, the more the morphology is regular and round, the more uniform the stress of the holes is, the less cracking is likely to occur, and the higher the strength is.
It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all embodiments. Obviously, all other embodiments obtained by persons skilled in the art based on the above embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.
Claims (8)
1. The fiber-doped modified light foam concrete for the building is characterized by being prepared from the following raw materials in parts by weight: 200-400 parts of cement, 50-80 parts of auxiliary materials, 10-20 parts of fly ash, 80-120 parts of water, 10-20 parts of foaming agent, 10-20 parts of modified glass fiber, 10-20 parts of redispersible latex powder, 5-10 parts of water reducing agent and 0.1-0.5 part of dispersing agent.
2. The fiber-doped modified light-weight foam concrete for buildings according to claim 1, wherein the cement is portland cement and/or sulphoaluminate cement.
3. The fiber-doped modified light-weight foam concrete for the building according to claim 1, characterized in that the auxiliary materials are formed by mixing clay, lime powder and silica fume according to a mass ratio of 30-50.
4. The fiber-doped modified light-weight foam concrete for buildings according to claim 1, wherein the foaming agent is one or a combination of cocamidopropyl betaine, hydrogen peroxide or sodium dodecyl sulfate.
5. The fiber-doped modified light-weight foam concrete for buildings according to claim 1, characterized in that the preparation method of the modified glass fiber comprises the following steps:
(1) Ultrasonic cleaning the glass fiber with deionized water and anhydrous ethanol for 10-20min, and air drying; soaking the glass fiber in 30% by weight of H 2 O 2 Putting the solution into a hydrothermal kettle, treating the solution for 1 to 2 hours at the temperature of between 70 and 80 ℃, and drying the solution for later use to obtain pretreated glass fibers;
(2) Soaking 5g of pretreated glass fiber in 40-50ml of ethanol solution, adding 5-8ml of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 45-50mL of ethanol, adding 2-4mL of deionized water and 0.1-0.3mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring at room temperature for 30-60min, aging at 70 ℃ for 3-5h, filtering, and fully drying to obtain the modified glass fiber.
6. The fiber-doped modified light foam concrete for buildings according to claim 1, characterized in that the water reducing agent is at least one of polycarboxylic acid water reducing agents, naphthalene water reducing agents and fatty acid water reducing agents.
7. The fiber-doped modified light-weight foam concrete for buildings according to claim 1, wherein the dispersant is one or more of fatty alcohol-polyoxyethylene ether, alpha-sodium alkenyl sulfonate, sodium dodecyl sulfate and triterpenoid saponin.
8. A method for preparing the fiber-doped modified light foam concrete for the buildings according to any one of claims 1 to 7, which is characterized by comprising the following steps:
(1) Preparing modified glass fiber: ultrasonic cleaning the glass fiber with deionized water and anhydrous ethanol for 10-20min, and air drying; soaking the glass fiber in 30% by weight of H 2 O 2 Putting the solution into a hydrothermal kettle, treating the solution for 1 to 2 hours at the temperature of between 70 and 80 ℃, and drying the solution for later use to obtain pretreated glass fibers; soaking 5g of pretreated glass fiber in 40-50mL of ethanol solution, adding 5-8mL of TEOS, and uniformly stirring to obtain a mixed solution A; measuring 45-50mL of ethanol, adding 2-4mL of deionized water and 0.1-0.3mL of HCl, and uniformly stirring to obtain a solution B; slowly dripping the solution B into the mixed solution A, stirring at room temperature for 30-60min, aging at 70 ℃ for 3-5h, filtering, and fully drying to obtain modified glass fiber;
placing cement, auxiliary materials, fly ash, water, modified glass fiber, redispersible latex powder, a water reducing agent and a dispersing agent into a container according to the parts by weight, pouring a foaming agent into the container to mix the materials after uniformly stirring the materials by a stirrer, and curing the materials after uniformly stirring the materials to obtain the foam concrete.
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