CN109231951B - Use method of foamed self-breaking concrete based on magnetic thermal excitation - Google Patents
Use method of foamed self-breaking concrete based on magnetic thermal excitation Download PDFInfo
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- CN109231951B CN109231951B CN201811146409.9A CN201811146409A CN109231951B CN 109231951 B CN109231951 B CN 109231951B CN 201811146409 A CN201811146409 A CN 201811146409A CN 109231951 B CN109231951 B CN 109231951B
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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
- C04B28/36—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 sulfur, sulfides or selenium
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
According to the method for using the foamed self-breaking concrete based on magnetic thermal excitation, the temporary supporting structure is poured by the self-breaking concrete added with a vulcanizing agent, a foaming agent, rubber powder, magnetic powder and perlite or vermiculite, when the temporary structure is dismantled or damaged, an alternating magnetic field is applied to a pouring area, through mutual cooperation of the components, the temperature inside the concrete can be rapidly increased, the foaming agent is foamed and deflated at high temperature, and the coarse and fine aggregates are expanded in volume at high temperature, so that the concrete is rapidly cracked and automatically broken. Because the strength of the concrete after cracking is greatly reduced, the temporary supporting structure cast by the concrete is convenient to dismantle, saves time and reduces the construction difficulty.
Description
Technical Field
The invention belongs to the technical field of concrete for building construction, and particularly relates to a use method of foamed self-breaking concrete based on magnetic thermal excitation.
Background
With the rapid development of cities in China, the overground space of the cities is increasingly tense. High-rise and super high-rise buildings emerge in large quantities, and deep foundation pit engineering is increasing due to the establishment of corresponding matched buildings such as multi-storey basements, underground tunnels, commercial streets and the like. The inner support taking the reinforced concrete as the main form becomes one of main temporary supporting structures for supporting the deep foundation pit due to the complexity of the surrounding environment of the building, has the advantages of high rigidity, small deformation and the like, can effectively control the deformation of a soil retaining structure, and greatly improves the stability of the deep foundation pit. However, as a temporary supporting structure, how to easily remove the temporary supporting structure in the subsequent construction process is a difficult problem to be solved urgently. At present, the method for removing the reinforced concrete inner support mainly comprises four methods, namely manual removal, mechanical removal, blasting removal and wire saw cutting. The manual demolition method is low in construction efficiency, and other three methods form larger vibration, noise and dust in the demolition process, so that the method brings larger interference to the surrounding environment and the normal life of residents.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for using foamed self-breaking concrete based on magnetic thermal excitation, so that the concrete pouring structure is convenient to dismantle, saves time and reduces construction difficulty.
The invention provides a use method of foaming self-breaking concrete based on magnetic thermal excitation, which comprises the following steps:
step 1: weighing the following components in proportion: 250 portions of vulcanizing agent 200-;
step 2: uniformly stirring portland cement, fine aggregate, coarse aggregate, rubber powder and magnetic powder, and heating to 100-120 ℃ to obtain a preheated aggregate mixture for later use;
and step 3: heating the vulcanizing agent to 135-146 ℃, and keeping the temperature for 30min to ensure that the vulcanizing agent is completely melted;
and 4, step 4: mixing the preheated aggregate mixture prepared in the step 2 with the vulcanizing agent in a molten state prepared in the step 3, adding the rest components, fully stirring in a heating stirrer, and keeping the temperature at 135-146 ℃ during stirring to finally obtain the foamed self-breaking concrete based on magnetothermal excitation;
and 5: pouring the foamed self-breaking concrete mixture prepared in the step 4 into a preset template support designated area, wherein the pouring process is continuous and uninterrupted;
step 6: after pouring, fully vibrating by using a vibrating rod;
and 7: covering a thin film on the surface of the poured engineering or scattering a film-covered curing agent for curing;
and 8: after the concrete member is maintained to reach a certain strength, the mold can be removed, and the concrete member is manufactured;
and step 9: when the member needs to be dismantled or destroyed, an alternating magnetic field with the amplitude of 0.1T-1T and the frequency of 30 Hz-60 Hz is applied to the pouring area of the foamed self-breaking concrete to penetrate through the concrete, the temperature of the concrete is rapidly increased, when the temperature is increased to more than 190 ℃, the foaming agent is foamed and deflated, the volume of the coarse aggregate and the fine aggregate is expanded at high temperature, so that the concrete is cracked and automatically broken, and the use is completed.
In the method for using the foamed self-breaking concrete based on the magnetic thermal excitation, the coarse aggregate is perlite particles or vermiculite particles which have a diameter of 10mm-40mm and are not roasted at high temperature.
In the method for using the foamed self-breaking concrete based on the magnetocaloric excitation, the fine aggregate is perlite sand or vermiculite sand with the diameter of 0.1mm-5mm, which is not roasted at high temperature.
In the method for using the foamed self-breaking concrete based on the magnetic thermal excitation, the magnetic powder is manganese-zinc ferrite powder or Fe3O4And (3) powder.
In the application method of the foamed self-breaking concrete based on the magnetic thermal excitation, the mineral filler is fly ash or silica micropowder.
In the method for using the foamed self-breaking concrete based on the magnetic thermal excitation, the vulcanizing agent is sulfur.
In the method for using the foamed self-breaking concrete based on the magnetic thermal excitation, the foaming agent is OBSH, and the auxiliary foaming agent is one or more of stearic acid and alum.
In the application method of the foamed self-breaking concrete based on the magnetic thermal excitation, the modified flow agent is ethylene-butadiene-styrene copolymer, the filler is graphite, the reinforcing agent is carbon black, and the dispersing agent is methyl amyl alcohol.
In the application method of the foamed self-breaking concrete based on the magnetic thermal excitation, the rubber powder is waste rubber tire powder.
In the application method of the foamed self-breaking concrete based on the magnetic thermal excitation, the actually measured density after mixing and stirring is 2000-3。
The invention adopts the foaming self-crushing type concrete pouring temporary supporting structure added with vulcanizing agent, foaming agent, rubber powder, magnetic powder, perlite or vermiculite as components, when the temporary structure is dismantled or destroyed, an alternating magnetic field is applied to a pouring area, and the magnetic powder inside converts magnetic field energy into heat energy under the action of the alternating magnetic field. The vulcanizing agent can promote the internal temperature of the concrete member to rapidly rise in a short time, and the vulcanizing agent can keep a liquid state for a long time after the temperature reaches a melting point, so that time is provided for foaming and air release of the foaming agent and sufficient reaction of coarse and fine aggregates. When the internal temperature of the concrete rises to a certain temperature, the volume of the perlite or the vermiculite can be expanded by 6-20 times rapidly, and the concrete member is cracked and broken in a short time, so that the member is convenient to dismantle, the time is saved, the construction difficulty is reduced, and the method is suitable for popularization.
Detailed Description
The invention relates to a method for using foamed self-breaking concrete based on magnetic thermal excitation, which comprises the following steps:
step 1: weighing the following components in proportion: 250 portions of vulcanizing agent 200-;
step 2: uniformly stirring portland cement, fine aggregate, coarse aggregate, rubber powder and magnetic powder, and heating to 100-120 ℃ to obtain a preheated aggregate mixture for later use;
and step 3: heating the vulcanizing agent to 135-146 ℃, and keeping the temperature for 30min to ensure that the vulcanizing agent is completely melted;
and 4, step 4: mixing the preheated aggregate mixture prepared in the step 2 with the vulcanizing agent in a molten state prepared in the step 3, adding the rest components, fully stirring in a heating stirrer, and keeping the temperature at 135-146 ℃ during stirring to finally obtain the foamed self-breaking concrete based on magnetothermal excitation;
and 5: pouring the foamed self-breaking concrete mixture prepared in the step 4 into a preset template support designated area, wherein the pouring process is continuous and uninterrupted;
step 6: after pouring, fully vibrating by using a vibrating rod;
and 7: covering a thin film on the surface of the poured engineering or scattering a film-covered curing agent for curing;
and 8: after the concrete member is maintained to reach a certain strength, the mold can be removed, and the concrete member is manufactured;
and step 9: when the member needs to be dismantled or damaged, an alternating magnetic field with the amplitude of 0.1T-1T and the frequency of 30 Hz-60 Hz is applied to the pouring area of the foamed self-crushing type concrete to penetrate through the concrete, and the temperature of the concrete is rapidly increased. When the temperature rises to over 190 ℃, the foaming agent foams and deflates, and the coarse and fine aggregates expand in volume at high temperature, so that the concrete is cracked and crushed automatically, and the use is finished.
In specific implementation, the coarse aggregate is perlite particles or vermiculite particles which are not roasted at high temperature and have the diameter of 10mm-40 mm. The fine aggregate is perlite sand or vermiculite sand which is not roasted at high temperature and has the diameter of 0.1mm-5 mm. The magnetic powder is manganese zinc ferrite powder or Fe3O4And (3) powder. The mineral filler is fly ash or silica micropowder. The vulcanizing agent is sulfur, and the foaming agent is OBSH; the modified flowing agent is ethylene-butadiene-styrene copolymer, the filler is graphite, the reinforcing agent is carbon black, the dispersing agent is methyl amyl alcohol, and the assistant foaming agent is one or more of stearic acid and alum. The actual measured density after the components are mixed and stirred is 2000-2650kg/m3。
The present invention is further illustrated by the following examples. In specific implementation, the step 1 may be weighed according to the component proportions in table 1:
table 1:
in example 1, the coarse aggregate is perlite particles having a diameter of 10mm to 40mm which have not been subjected to high temperature roasting, and the fine aggregate is perlite sand having a diameter of 0.1mm to 5mm which have not been subjected to high temperature roasting. The magnetic powder is manganese-zinc ferrite powder, the mineral filler is fly ash, the vulcanizing agent is sulfur, the foaming agent is OBSH, the modified flowing agent is ethylene-butadiene-styrene copolymer, the filling agent is graphite, the reinforcing agent is carbon black, the dispersing agent is methyl amyl alcohol, the co-foaming agent is stearic acid, and the rubber powder is waste rubber tire powder. The actual measurement density of the mixed and stirred components is 2000kg/m3。
In example 2, the coarse aggregate was perlite particles having a diameter of 10mm to 40mm which had not been subjected to high-temperature roasting, and the fine aggregate was perlite sand having a diameter of 0.1mm to 5mm which had not been subjected to high-temperature roasting. The magnetic powder is Fe3O4The rubber tire is prepared from powder, a vulcanizing agent, a foaming agent, a modified flowing agent, a filler, a reinforcing agent, a dispersing agent, a co-foaming agent and rubber powder, wherein the vulcanizing agent is sulfur, the foaming agent is OBSH, the modified flowing agent is an ethylene-butadiene-styrene copolymer, the filler is graphite, the reinforcing agent is carbon black, the dispersing agent is methyl amyl alcohol, the co-foaming agent is stearic acid, and the rubber powder is waste. The actual measurement density of the mixed components is 2100kg/m3。
In example 3, the coarse aggregate was perlite particles having a diameter of 10mm to 40mm which had not been subjected to high-temperature roasting, and the fine aggregate was perlite sand having a diameter of 0.1mm to 5mm which had not been subjected to high-temperature roasting. The magnetic powder is manganese-zinc ferrite powder, the mineral filler is fly ash, the vulcanizing agent is sulfur, the foaming agent is OBSH, the modified flowing agent is ethylene-butadiene-styrene copolymer, the filling agent is graphite, the reinforcing agent is carbon black, the dispersing agent is methyl amyl alcohol, the co-foaming agent is stearic acid, and the rubber powder is waste rubber tire powder. The actual measured density of the mixed and stirred components is 2200kg/m3。
In example 4, the coarse aggregate was perlite particles having a diameter of 10mm to 40mm which had not been subjected to high-temperature roasting, and the fine aggregate was perlite sand having a diameter of 0.1mm to 5mm which had not been subjected to high-temperature roasting. The magnetic powder is Fe3O4The rubber tire is prepared from powder, mineral filler, vulcanizing agent, foaming agent, modifying flow agent, filler, reinforcing agent, rubber powder and a foaming agent. The actual measurement density of the mixed components is 2350kg/m3。
In example 5, the coarse aggregate was vermiculite particles of 10mm to 40mm diameter which had not been subjected to high temperature calcination, and the fine aggregate was vermiculite sand of 0.1mm to 5mm diameter which had not been subjected to high temperature calcination. The magnetic powder is Fe3O4The rubber tire filler is powder, the mineral filler is fly ash, the vulcanizing agent is sulfur, the foaming agent is OBSH, the modified flowing agent is ethylene-butadiene-styrene copolymer, the filler is graphite, the reinforcing agent is carbon black, the dispersing agent is methyl amyl alcohol, the auxiliary foaming agent is alum, and the rubber powder is waste rubber tire powder. The actual measurement density of the mixed components is 2500kg/m3。
In example 6, the coarse aggregate was vermiculite particles of 10mm to 40mm diameter which were not subjected to high temperature calcination, and the fine aggregate was vermiculite sand of 0.1mm to 5mm diameter which was not subjected to high temperature calcination. The magnetic powder is manganese zinc ferrite powder, the mineral filler is silicon powder, the vulcanizing agent is sulfur, the foaming agent is OBSH, the modified flowing agent is ethylene-butadiene-styrene copolymer, the filling agent is graphite, the reinforcing agent is carbon black, the dispersing agent is methyl amyl alcohol, the co-foaming agent is alum, and the rubber powder is waste rubber tire powder. The actual measured density of the mixed components after mixing is 2650kg/m3。
Uniformly stirring the portland cement, the fine aggregate, the coarse aggregate, the rubber powder and the magnetic powder in the embodiments 1-6, and heating to 100-120 ℃ to obtain a preheated aggregate mixture for later use;
heating the vulcanizing agent to 135-146 ℃, and keeping the temperature for 30min to ensure that the vulcanizing agent is completely melted;
mixing the prepared preheated aggregate mixture with the prepared vulcanizing agent in a molten state, adding the rest components, and fully stirring in a heating stirrer, wherein the temperature is kept at 135-146 ℃ during stirring, and finally obtaining the foamed self-breaking concrete based on magnetothermal excitation.
The prepared foaming self-breaking concrete mixture is poured into a preset template support designated area, and the pouring process is continuous and uninterrupted; after pouring, fully vibrating by using a vibrating rod;
covering a thin film on the surface of the poured engineering or scattering a film-covered curing agent for curing;
curing is carried out according to the curing mode of common concrete, performance test is carried out after 28 days, and the test results are shown in Table 2.
And (3) testing the compressive strength: the prepared sample specification is phi 50X 100mm cylinder test specimen.
And (3) testing the breaking strength: the prepared sample is a rectangular parallelepiped sample having a specification of 100mm × 25mm × 25 mm.
Table 2:
after the concrete member is maintained to reach a certain strength, the mold can be removed, and the concrete member is manufactured;
when the member needs to be dismantled or damaged, an alternating magnetic field with the amplitude of 0.1T-1T and the frequency of 30 Hz-60 Hz is applied to the pouring area of the foamed self-crushing type concrete to penetrate through the concrete, so that the temperature of the concrete is rapidly increased. When the temperature rises to more than 190 ℃, the foaming agent foams and deflates, and the volumes of the coarse aggregate and the fine aggregate expand, so that the concrete is cracked and crushed automatically, and the use is finished.
According to the invention, the foaming self-breaking concrete pouring temporary supporting structure added with the vulcanizing agent, the foaming agent, the rubber powder, the magnetic powder, the perlite or the vermiculite is adopted, when the temporary structure is dismantled or damaged, an alternating magnetic field is applied to a pouring area, the vulcanizing agent, the foaming agent, the rubber powder, the magnetic powder, the perlite or the vermiculite are matched with one another, the temperature in the concrete can be rapidly raised, the foaming agent is foamed and deflated at high temperature, and the coarse and fine aggregates are expanded in volume at high temperature, so that the concrete is cracked and automatically broken. Because the strength of the concrete after cracking is greatly reduced, the temporary supporting structure cast by the concrete is convenient to dismantle, saves time and reduces the construction difficulty.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined by the appended claims.
Claims (1)
1. A use method of foamed self-breaking concrete based on magnetic thermal excitation is characterized by comprising the following steps:
step 1: weighing the following components in proportion: 250 portions of vulcanizing agent 200-; the foaming agent is OBSH, the coarse aggregate is perlite particles or vermiculite particles which are not roasted at high temperature and have the diameter of 10mm-40mm, and the fine aggregate is perlite sand or vermiculite sand which is not roasted at high temperature and have the diameter of 0.1mm-5 mm;
step 2: uniformly stirring portland cement, fine aggregate, coarse aggregate, rubber powder and magnetic powder, and heating to 100-120 ℃ to obtain a preheated aggregate mixture for later use;
and step 3: heating the vulcanizing agent to 135-146 ℃, and keeping the temperature for 30min to ensure that the vulcanizing agent is completely melted;
and 4, step 4: mixing the preheated aggregate mixture prepared in the step 2 with the vulcanizing agent in a molten state prepared in the step 3, adding the rest components, fully stirring in a heating stirrer, and keeping the temperature at 135-146 ℃ during stirring to finally obtain the foamed self-breaking concrete based on magnetothermal excitation;
and 5: pouring the foamed self-breaking concrete mixture prepared in the step 4 into a preset template support designated area, wherein the pouring process is continuous and uninterrupted;
step 6: after pouring, fully vibrating by using a vibrating rod;
and 7: covering a thin film on the surface of the poured engineering or scattering a film-covered curing agent for curing;
and 8: after the concrete member is maintained to reach a certain strength, the mold can be removed, and the concrete member is manufactured;
and step 9: when the member needs to be dismantled or destroyed, an alternating magnetic field with the amplitude of 0.1T-1T and the frequency of 30 Hz-60 Hz is applied to a pouring area of the foaming self-breaking type concrete to penetrate through the concrete, the temperature of the concrete is rapidly increased, when the temperature is increased to more than 190 ℃, the foaming agent is foamed and deflated, and the coarse aggregate and the fine aggregate are expanded in volume at high temperature, so that the concrete is cracked and automatically broken, and the use is completed;
the magnetic powder is manganese zinc ferrite powder or Fe3O4Powder; the mineral filler is fly ash or silica micropowder; the vulcanizing agent is sulfur; the auxiliary foaming agent is one or more of stearic acid and alum; the modified flowing agent is ethylene-butadiene-styrene copolymer, the filler is graphite, the reinforcing agent is carbon black, and the dispersing agent is methyl amyl alcohol; the rubber powder is waste rubber tire powder; the actual measured density after mixing and stirring is 2000-2650kg/m3。
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Effective date of registration: 20211012 Address after: 066000 3rd floor, No.106, building 4, chuangzhigang, 29 Longhai Road, Qinhuangdao Economic and Technological Development Zone, Hebei Province Patentee after: BEIBO INTELLIGENT TECHNOLOGY QINHUANGDAO Co.,Ltd. Address before: 110168 No. 9 Hunnan East Road, Hunnan District, Shenyang City, Liaoning Province Patentee before: SHENYANG JIANZHU University |