CN118184259A - Mosquito-repellent high-performance concrete and preparation method thereof - Google Patents
Mosquito-repellent high-performance concrete and preparation method thereof Download PDFInfo
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Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a mosquito-repellent high-performance concrete and a preparation method thereof, wherein the water-cement ratio of the concrete is 0.23-0.3, and a cementing material is prepared from the following components in percentage by mass: 30-50% of silicate cement, 30-40% of fine aggregate, 5-10% of coarse aggregate, 8-12% of fly ash, 5-8% of silica fume, 0.5-3% of functional polypropylene fiber and 3-5% of additive; according to the invention, the polypropylene fibers with the long-acting mosquito-repellent function are dispersed into the concrete, so that the anti-cracking and anti-seepage properties and anti-abrasion properties of the concrete can be obviously improved, the toughness of the concrete is increased, and the service life of the concrete is prolonged; and the mosquito repellent also contains effective mosquito repellent components, can keep a continuous mosquito repellent function, and has lasting and nontoxic effects.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to mosquito-repellent high-performance concrete and a preparation method thereof.
Background
The concrete is the engineering material with the maximum consumption and the widest application range because of the advantages of abundant raw materials, low price, simple production process, high compressive strength, good durability and the like. Along with the continuous improvement of the living standard of people, the concrete gradually develops towards high performance and multifunction. The performance of high-strength and high-durability concrete is continuously improved, and the special concrete suitable for various industries and different application environments is also continuously innovated.
Concrete has inherent disadvantages such as low tensile strength, high brittleness, poor impact resistance and wear resistance, and is prone to plastic cracking, making it difficult to meet the requirements for application in certain projects. When the concrete crack exceeds the limit, aging of the material and deterioration of the structure are accelerated, resulting in a reduction in structural load-bearing capacity and durability. It is therefore necessary to provide more effective measures for preventing cracking of concrete and controlling the propagation of existing cracks.
The polypropylene fiber is the earliest synthetic fiber used for reinforcing concrete, has the advantages of small density, small monofilament diameter, low elastic modulus, high tensile rate, high tensile strength, acid and alkali resistance and the like, and the polypropylene fiber concrete formed after being mixed with the concrete has better ductility, toughness and impact resistance, so the polypropylene fiber concrete also becomes one of fiber concrete with wide application.
Chinese patent document CN201410543947.7 discloses a preparation method of polypropylene fiber concrete, which comprises the steps of firstly cleaning dry sand and cobble with clear water and airing; then stirring and mixing cement and polypropylene fiber uniformly; and then pouring slag, fly ash and silica powder together with the obtained washed and dried dry sand and stones into a concrete mixer for dry mixing, pouring the mixed cement and polypropylene fiber mixture into the concrete mixer, sealing a mouth of the concrete mixer by using a plastic film, carrying out dry mixing, and adding a water reducing agent for mixing to obtain the concrete mixer.
Along with the increasing diversification of the demands of people on the functions of the concrete, the demand for the concrete which not only can obviously improve the anti-cracking and anti-seepage performance and the anti-abrasion performance of the concrete, can increase the toughness and prolong the service life, but also has stable and long-acting mosquito-repellent effect is started, so that the areas such as parks, grasslands, riversides and the like at night are prevented from being affected by mosquitoes.
Disclosure of Invention
In order to solve the defects existing in the prior art, the invention aims to provide the mosquito-repellent high-performance concrete and the preparation method thereof, and the polypropylene fiber with the long-acting mosquito-repellent function is dispersed into the concrete, so that the anti-cracking and anti-permeability performance and the anti-abrasion performance of the concrete can be obviously improved, the toughness of the concrete is increased, and the service life of the concrete is prolonged; and the effective mosquito repellent component contained in the polypropylene fiber can keep the continuous mosquito repellent function, and has lasting and nontoxic effect.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The mosquito-repellent high-performance concrete has a water-cement ratio of 0.23-0.3, and the cementing material is prepared from the following components in percentage by mass: 30-50% of silicate cement, 30-40% of fine aggregate, 5-10% of coarse aggregate, 8-12% of fly ash, 5-8% of silica fume, 0.5-3% of functional polypropylene fiber and 3-5% of additive.
Preferably, the Portland cement is 32.5-52.5 ordinary Portland cement.
Preferably, the fine aggregate is river sand with the particle size of 20-80 meshes; the coarse aggregate is pebble with the particle size of 3-10 mm.
Preferably, the fly ash is grade II fly ash, the sieving residue rate of the fly ash passing through a 45 mu m square hole sieve is 15-25%, the density is 2.0-3.0 g/cm 3, the SiO 2 content of the silica fume is more than 90wt%, the density is 2.0-2.80 g/cm 3, and the specific surface area is 18000-21000 m 2/kg. .
Preferably, the additive is one or more of a water reducing agent, an accelerator, an expanding agent and an air entraining agent.
Preferably, the preparation method of the functional polypropylene fiber comprises the following steps:
(1) Adsorbing and loading Eucalyptus citriodora essential oil, glycerol, beta-cyclodextrin and menthol with nanometer tourmaline powder, and vacuum drying to obtain slow-release mosquito repellent;
(2) Adding the slow-release mosquito repellent, the polypropylene master batch, the antioxidant, the dispersing agent and the molecular weight regulator into a rotary mixer, uniformly mixing, and melting and granulating by a double-screw extruder to obtain the mosquito repellent master batch;
(3) And (3) blending the mosquito-repellent master batch with polypropylene monomer particles for melt spinning, spinning a mosquito-repellent polypropylene partially oriented yarn, and texturing to obtain the polypropylene low-stretch yarn, namely the functional polypropylene fiber.
Preferably, in the step (1), the weight ratio of the eucalyptus citriodora essential oil, the glycerol, the beta-cyclodextrin, the menthol and the nano tourmaline powder is 0.3-0.5: 10:0.01 to 0.03:0.3 to 0.5:10 to 15.
Preferably, in the step (2), the weight ratio of the slow-release mosquito repellent, the polypropylene master batch, the antioxidant, the dispersing agent and the molecular weight regulator is 3-8: 85-95: 0.5 to 1:1 to 3:3 to 5; the antioxidant is one or more of antioxidant 1010, antioxidant 168 and antioxidant 1076, the dispersing agent is one or more of EBS, zinc stearate, erucamide, solid paraffin and alpha-methyl styrene, and the molecular weight regulator is one or more of di-tert-butyl peroxide (DTBP), 2, 5-dimethyl-2, 5-di (tert-butyl peroxy) hexane (DHBP) and 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-Triperoxynonane (TPO).
Preferably, in the step (3), the weight ratio of the mosquito-repellent master batch to the polypropylene monomer particles is 3-15: 97-85; the temperature of the blending melt spinning is 220-270 ℃, and the winding speed is 2000-2600 m/min.
The invention also claims a preparation method of the mosquito-repellent high-performance concrete, which comprises the following steps: and weighing silicate cement, fine aggregate, coarse aggregate, fly ash, silica fume, functional polypropylene fiber and additive according to the weight ratio, adding the mixture into water, and uniformly stirring at 300-500 r/min to obtain the mosquito-repellent high-performance concrete.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides the mosquito-repellent high-performance concrete, which can obviously improve the anti-cracking and anti-seepage properties and anti-abrasion properties of the concrete, increase the toughness of the concrete and prolong the service life of the concrete by adding the polypropylene fiber with the long-acting mosquito-repellent function; meanwhile, the slow-release mosquito repellent in the concrete can slowly release mosquito repellent gas, and has stable and long-acting mosquito repellent effect, so that the high-performance concrete with high performance and dual functions of mosquito repellent is obtained.
The invention provides a slow-release mosquito repellent, which has pleasant smell of eucalyptus citriodora essential oil and menthol, and the characteristics of the mosquito repellent are taken as main active ingredients of the mosquito repellent; the glycerol and the beta-cyclodextrin can increase the stability of the medicine, prevent the medicine from being oxidized and decomposed, improve the stability of the eucalyptus citriodora essential oil and menthol, and enhance the emulsifying capacity so as to facilitate the adsorption of nano tourmaline powder; the nanometer tourmaline powder is used as the adsorbent carrier of insect repellent, has excellent adsorption performance, pyroelectric performance, far infrared radiation, anion release performance and other unique performances, and has far infrared ray emitted in the wavelength range of 4-18 microns and certain mosquito attracting effect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples. Of course, the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Unless otherwise specified, both chemical reagents and materials in the present invention are purchased through a market route or synthesized from raw materials purchased through a market route.
The particle size of the nano tourmaline is 3000-8000 meshes, and the purity is 98%.
The invention will be further illustrated by the following examples.
Example 1
A preparation method of functional polypropylene fiber comprises the following steps:
(1) Adsorbing and loading 0.4kg of eucalyptus citriodora essential oil, 10kg of glycerol, 0.02kg of beta-cyclodextrin and 0.4kg of menthol with 12kg of nano tourmaline powder, and vacuum drying to obtain a slow-release mosquito repellent;
(2) Adding 5kg of slow-release mosquito repellent, 90kg of polypropylene master batch, 0.8kg of antioxidant 1010, 2kg of dispersing agent zinc stearate and 4kg of molecular weight regulator DTBP into a rotary mixer, uniformly mixing, and melting and granulating by a double-screw extruder to obtain the mosquito repellent master batch;
(3) 9kg of mosquito-repellent master batch and 91kg of polypropylene monomer particles are blended and melt-spun at 250 ℃, the winding speed is 2300m/min, the partially oriented yarn of the mosquito-repellent polypropylene is spun, and the polypropylene low stretch yarn is obtained after texturing, namely the functional polypropylene fiber.
Example 2
A preparation method of the mosquito-repellent high-performance concrete comprises the following steps:
40kg of 42.5R silicate cement, 35kg of 80-mesh river sand, 6kg of 3mm stone, 10kg of fly ash, 8kg of silica fume, 1kg of functional polypropylene fiber and 3kg of polycarboxylic acid high-performance water reducer are added with 18kg of clear water and stirred in a concrete mixer for 5min, so that the mosquito-repellent high-performance concrete is obtained.
Example 3
A preparation method of the mosquito-repellent high-performance concrete comprises the following steps:
35kg of 32.5R silicate cement, 40kg of 40-mesh river sand, 10kg of 6mm stone, 8kg of fly ash, 5kg of silica fume, 2kg of functional polypropylene fiber and 5kg of polycarboxylic acid high-performance water reducer are added with 17kg of clear water and stirred in a concrete mixer for 4min, so that the mosquito-repellent high-performance concrete is obtained.
Example 4
A preparation method of the mosquito-repellent high-performance concrete comprises the following steps:
40kg of 52.5R silicate cement, 30kg of 20-mesh river sand, 10kg of 1cm stone, 12kg of fly ash, 8kg of silica fume, 1.5kg of functional polypropylene fiber, 3kg of polycarboxylic acid high-performance water reducer and 1.5kg of accelerator are added with 20kg of clear water and stirred in a concrete mixer for 5min, so that the mosquito-repellent high-performance concrete is obtained.
Comparative example 1
A preparation method of concrete comprises the following steps:
40kg of 42.5R silicate cement, 35kg of 80-mesh river sand, 6kg of 3mm stone, 10kg of fly ash, 8kg of silica fume and 3kg of polycarboxylic acid high-performance water reducer are added with 18kg of clear water and stirred in a concrete mixer for 5min, so that the concrete is obtained.
3 Cylinders with the diameter of 23cm and the length of 50cm are connected in series, baffle plates are firstly used for blocking the positions between the cylinders and the two ends, 120 female mosquitoes are placed in the middle cylinder, concrete (3 cm multiplied by 3 cm) prepared by the examples and the comparative examples is placed in the other cylinder, the baffle plates between the cylinders are pulled out after 3min, the baffle plates are inserted back to the original positions after 15min, and the female mosquitoes of the cylinders on the two sides are recorded at the moment. The mosquito repelling rate of the concrete to mosquitoes is calculated as follows:
Mosquito repelling rate% = (blank cylinder mosquito count-concrete cylinder mosquito count)/blank cylinder mosquito count
The test was performed 3 times in parallel, and the average value was taken, and the obtained results are shown in Table 1.
The maximum hydrostatic pressure (MPa) of the concrete prepared in each example and comparative example without water seepage is detected according to GB/T50082-2009 Standard for test method of ordinary concrete long-term Performance and durability; detecting whether cracks of the concrete samples of 28d formed by each example and each comparative example are c-grade or d-grade according to GB50144-2019 industrial building reliability evaluation Standard; the 28d compressive strength (MPa) of the concrete samples prepared in each example and comparative example was measured according to GB/T50081-2019 Standard of test method for physical mechanical Properties of concrete. The specific data are shown in Table 1.
Table 1 results of concrete performance test
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The mosquito-repellent high-performance concrete is characterized in that the water-cement ratio is 0.23-0.3, and the cementing material is prepared from the following components in percentage by mass: 30-50% of silicate cement, 30-40% of fine aggregate, 5-10% of coarse aggregate, 8-12% of fly ash, 5-8% of silica fume, 0.5-3% of functional polypropylene fiber and 3-5% of additive.
2. The concrete of claim 1, wherein the portland cement is 32.5 to 52.5 portland cement.
3. The concrete according to claim 1, wherein the fine aggregate is river sand with a particle size of 20-80 meshes; the coarse aggregate is pebble with the particle size of 3-10 mm.
4. The concrete according to claim 1, wherein the fly ash is a class ii fly ash having a sieving rate of 15 to 25% by passing through a 45 μm square-hole sieve, a density of 2.0 to 3.0g/cm 3, a SiO 2 content of 90wt% or more, a density of 2.0 to 2.80g/cm 3, and a specific surface area of 18000 to 21000m 2/kg. .
5. The concrete of claim 1, wherein the admixture comprises one or more of a water reducing agent, an accelerator, an expander, and an air entraining agent.
6. The concrete according to claim 1, characterized in that the preparation method of the functional polypropylene fiber comprises the following steps:
(1) Adsorbing and loading Eucalyptus citriodora essential oil, glycerol, beta-cyclodextrin and menthol with nanometer tourmaline powder, and vacuum drying to obtain slow-release mosquito repellent;
(2) Adding the slow-release mosquito repellent, the polypropylene master batch, the antioxidant, the dispersing agent and the molecular weight regulator into a rotary mixer, uniformly mixing, and melting and granulating by a double-screw extruder to obtain the mosquito repellent master batch;
(3) And (3) blending the mosquito-repellent master batch with polypropylene monomer particles for melt spinning, spinning a mosquito-repellent polypropylene partially oriented yarn, and texturing to obtain the polypropylene low-stretch yarn, namely the functional polypropylene fiber.
7. The concrete according to claim 6, wherein in the step (1), the weight ratio of the eucalyptus citriodora essential oil, the glycerol, the beta-cyclodextrin, the menthol and the nano tourmaline powder is 0.3-0.5: 10:0.01 to 0.03:0.3 to 0.5:10 to 15.
8. The concrete according to claim 8, wherein in the step (2), the weight ratio of the slow-release mosquito repellent, the polypropylene master batch, the antioxidant, the dispersant and the molecular weight regulator is 3-8: 85-95: 0.5 to 1:1 to 3:3 to 5; the antioxidant is one or more of antioxidant 1010, antioxidant 168 and antioxidant 1076, the dispersing agent is one or more of EBS, zinc stearate, erucamide, solid paraffin and alpha-methyl styrene, and the molecular weight regulator is one or more of di-tert-butyl peroxide, 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane and 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane.
9. The concrete according to claim 8, wherein in the step (3), the weight ratio of the mosquito-repellent master batch to the polypropylene monomer particles is 3-15: 97-85; the temperature of the blending melt spinning is 220-270 ℃, and the winding speed is 2000-2600 m/min.
10. A method for preparing the mosquito-repellent high-performance concrete according to any one of claims 1 to 9, comprising the following steps: and weighing silicate cement, fine aggregate, coarse aggregate, fly ash, silica fume, functional polypropylene fiber and additive according to the weight ratio, adding the mixture into water, and uniformly stirring at 300-500 r/min to obtain the mosquito-repellent high-performance concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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