CN109098183B - Self-breaking concrete based on magnetic thermal excitation, preparation method and application thereof - Google Patents
Self-breaking concrete based on magnetic thermal excitation, preparation method and application thereof Download PDFInfo
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- CN109098183B CN109098183B CN201811146079.3A CN201811146079A CN109098183B CN 109098183 B CN109098183 B CN 109098183B CN 201811146079 A CN201811146079 A CN 201811146079A CN 109098183 B CN109098183 B CN 109098183B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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Abstract
The invention relates to self-breaking concrete based on magnetic thermal excitation, a preparation method and application thereof, wherein the concrete comprises the following components in percentage by weight: 250-300 parts of sulfur, 100-150 parts of Portland cement, 150-200 parts of fine aggregate, 350-500 parts of coarse aggregate, 10-20 parts of paraffin, 30-50 parts of magnetic powder and 20-30 parts of mineral filler, and the density after mixing and stirring is 2050-2850 kg/m3. The components are mutually matched and cooperated, so that the invention has the characteristics of high strength, corrosion resistance, permeation resistance and quick setting of the existing sulfur concrete, and also has the advantages of light weight and high heated volume expansion speed of the lightweight aggregate concrete. The invention has reasonable design, low cost and simple preparation process. The member made of the concrete has good mechanical property. When the component is dismantled, the component can be automatically burst and broken under the action of an external alternating magnetic field, so that the difficulty of dismantling construction is reduced, and the component is suitable for popularization and use.
Description
Technical Field
The invention belongs to the technical field of concrete for building construction, and particularly relates to self-breaking concrete based on magnetic thermal excitation, a preparation method and application thereof.
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 self-breaking concrete based on magnetic thermal excitation, a preparation method and application thereof.
The invention provides self-breaking concrete based on magnetic thermal excitation, which comprises the following components in percentage by weight: 250-300 parts of sulfur, 100-150 parts of Portland cement, 150-200 parts of fine aggregate, 350-500 parts of coarse aggregate, 10-20 parts of paraffin, 30-50 parts of magnetic powder and 20-30 parts of mineral filler, wherein the actual measured density of the mixed components is 2050-2850 kg/m3The coarse aggregate is perlite particles or vermiculite particles which are not roasted at high temperature and have the diameter of 10 mm-40 mm, and the fine aggregate is perlite sand or vermiculite sand which is not roasted at high temperature and have the diameter of 0.1 mm-5 mm.
In the self-breaking concrete based on the magnetic thermal excitation, the magnetic powder is manganese-zinc ferrite powder or Fe3O4And (3) powder.
In the self-breaking concrete based on the magnetocaloric excitation, the mineral filler is fly ash or silica micropowder.
The invention also provides a preparation method of the self-breaking concrete based on the magnetic thermal excitation, which comprises the following steps:
step 1: weighing the following components in proportion: 250-300 parts of sulfur, 100-150 parts of Portland cement, 150-200 parts of fine aggregate, 350-500 parts of coarse aggregate, 10-20 parts of paraffin, 30-50 parts of magnetic powder and 20-30 parts of mineral filler;
step 2: uniformly stirring the coarse aggregate, the fine aggregate, the Portland cement and the magnetic powder, and heating to 100-120 ℃ to obtain a preheated aggregate mixture for later use;
and step 3: heating the sulfur to 135-146 ℃, and preserving the heat for 30min to ensure that the sulfur is completely melted;
and 4, step 4: and (3) mixing the preheated aggregate mixture prepared in the step (2) with the molten sulfur prepared in the step (3), adding paraffin and mineral filler, fully stirring in a heating stirrer, and keeping the temperature at 135-146 ℃ during stirring to finally obtain the self-breaking concrete based on magnetic thermal excitation.
The self-breaking concrete based on the magnetic thermal excitation is applied to pouring of temporary supporting structures of deep foundation pit engineering of high-rise and super high-rise buildings.
The self-breaking concrete based on the magnetic thermal excitation has at least the following beneficial effects:
the invention has reasonable formula design, low cost and simple preparation process. When in use, the paint has the advantages of good mechanical property, permeation resistance, quick setting, low temperature resistance, freeze-thaw resistance and the like. The self-crushing concrete is added with sulfur and magnetic powder components, when a member needs to be dismantled, an alternating magnetic field is applied to the periphery of an area where the self-crushing concrete is poured, and the magnetic powder inside converts magnetic field energy into heat energy under the action of the alternating magnetic field. The sulfur can not only rapidly raise the internal temperature of the concrete member in a short time, but also keep the sulfur in a liquid state for a long time after the temperature reaches the melting point of the sulfur, thereby providing time for the full reaction of the coarse and fine aggregates. The method has the advantages that perlite or vermiculite is selected as a main raw material, when the internal temperature of the concrete is raised to a certain temperature, the volume of the concrete can be rapidly expanded by 6-20 times, so that the member is subjected to spalling and crushing in a short time, the member is convenient to detach, the time is saved, the construction difficulty is reduced, and the method is suitable for popularization.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
The self-breaking concrete based on magnetic thermal excitation comprises the following components in percentage by weight: 250 parts of sulfur, 100 parts of Portland cement, 150 parts of fine aggregate, 360 parts of coarse aggregate, 12 parts of paraffin, 35 parts of magnetic powder and 22 parts of mineral filler. The actually measured density of the mixed and stirred components is 2050kg/m3。
Wherein the coarse aggregate is perlite particles which are not roasted at high temperature and have the diameter of 10 mm-40 mm, and the fine aggregate is perlite sand which is not roasted at high temperature and has the diameter of 0.1 mm-5 mm. The magnetic powder is manganese zinc ferrite powder, and the mineral filler is fly ash.
The preparation method of the self-breaking concrete based on the magnetic thermal excitation comprises the following steps:
step 1: weighing according to the component proportion;
step 2: and uniformly stirring the coarse aggregate, the fine aggregate, the Portland cement and the magnetic powder, and heating to 100-120 ℃ to obtain a preheated aggregate mixture for later use.
And step 3: heating the sulfur to 142 ℃, and keeping the temperature for 30min to ensure that the sulfur is completely melted.
And 4, step 4: and (3) mixing the preheated aggregate mixture obtained in the step (2) with the molten sulfur obtained in the step (3), adding paraffin and mineral filler, fully stirring in a heating stirrer, and keeping the temperature at 135-146 ℃ during stirring to finally obtain the magnetic-heat-excited self-crushing concrete.
The self-breaking concrete based on the magnetic thermal excitation is applied to pouring of temporary supporting structures. The method can be particularly applied to pouring of temporary supporting structures of deep foundation pit engineering of high-rise and super high-rise buildings.
Example 2
The self-breaking concrete based on magnetic thermal excitation comprises the following components in percentage by weight: 270 parts of sulfur, 110 parts of Portland cement, 160 parts of fine aggregate, 380 parts of coarse aggregate, 12 parts of paraffin, 40 parts of magnetic powder and 22 parts of mineral filler. The actual measurement density of the mixed materials of the components is 2150kg/m3。
Wherein the coarse aggregate is perlite particles which are not roasted at high temperature and have the diameter of 10 mm-40 mm, and the fine aggregate is perlite sand which is not roasted at high temperature and has the diameter of 0.1 mm-5 mm. The magnetic powder is Fe3O4The powder and the mineral filler are silicon micropowder.
The preparation method and application of the self-crushing concrete based on the magnetic thermal excitation are the same as those of the example 1.
Example 3
The self-breaking concrete based on magnetic thermal excitation comprises the following components in percentage by weight: 290 parts of sulfur, 120 parts of Portland cement, 170 parts of fine aggregate, 400 parts of coarse aggregate, 15 parts of paraffin, 45 parts of magnetic powder and 25 parts of mineral filler. The actual measured density of the mixed and stirred components is 2250kg/m3。
Wherein the coarse aggregate is perlite particles which are not roasted at high temperature and have the diameter of 10 mm-40 mm, and the fine aggregate is perlite sand which is not roasted at high temperature and has the diameter of 0.1 mm-5 mm. The magnetic powder is manganese zinc ferrite powder, and the mineral filler is fly ash.
The preparation method and application of the self-crushing concrete based on the magnetic thermal excitation are the same as those of the example 1.
Example 4
The self-breaking concrete based on magnetic thermal excitation comprises the following components in percentage by weight: 300 parts of sulfur, 130 parts of Portland cement, 180 parts of fine aggregate, 420 parts of coarse aggregate, 15 parts of paraffin, 45 parts of magnetic powder and 25 parts of mineral filler. The actual measurement density of the mixed and stirred components is 2350kg/m3。
Wherein the coarse aggregate is perlite particles which are not roasted at high temperature and have the diameter of 10 mm-40 mm, and the fine aggregate is perlite sand which is not roasted at high temperature and has the diameter of 0.1 mm-5 mm. The magnetic powder is Fe3O4The powder and the mineral filler are silicon micropowder.
The preparation method and application of the self-crushing concrete based on the magnetic thermal excitation are the same as those of the example 1.
Example 5
The self-breaking concrete based on magnetic thermal excitation comprises the following components in percentage by weight: 300 parts of sulfur, 140 parts of Portland cement, 200 parts of fine aggregate, 450 parts of coarse aggregate, 20 parts of paraffin, 50 parts of magnetic powder and 28 parts of mineral filler. The actual measured density of the mixed and stirred components is 2650kg/m3。
Wherein the coarse aggregate is vermiculite particles which are not roasted at high temperature and have the diameter of 10 mm-40 mm, and the fine aggregate is vermiculite sand which is not roasted at high temperature and has the diameter of 0.1 mm-5 mm. The magnetic powder isFe3O4The powder and the mineral filler are fly ash.
The preparation method and application of the self-crushing concrete based on the magnetic thermal excitation are the same as those of the example 1.
Example 6
The self-breaking concrete based on magnetic thermal excitation comprises the following components in percentage by weight: 300 parts of sulfur, 150 parts of Portland cement, 200 parts of fine aggregate, 500 parts of coarse aggregate, 20 parts of paraffin, 50 parts of magnetic powder and 30 parts of mineral filler. The actual measurement density of the mixed and stirred components is 2850kg/m3。
Wherein the coarse aggregate is vermiculite particles which are not roasted at high temperature and have the diameter of 10 mm-40 mm, and the fine aggregate is vermiculite sand which is not roasted at high temperature and has the diameter of 0.1 mm-5 mm. The magnetic powder is manganese zinc ferrite powder, and the mineral filler is silicon micropowder.
The preparation method and application of the self-breaking concrete based on the magnetic thermal excitation are the same as those of the example 1.
The self-breaking concrete based on the magnetocaloric excitation prepared in examples 1 to 6 was cured in the manner of ordinary concrete curing, and performance tests were performed 28 days later, with the test results shown in table 1.
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 1
The sulfur component is added into the self-breaking concrete based on the magnetic thermal excitation, so that the poured concrete has the characteristics of compact structure, high strength, strong corrosion resistance, quick setting, impermeability and the like. Meanwhile, under the action of an external alternating magnetic field, the magnetic powder generates heat, the sulfur can quickly raise the temperature in a short time, and the sulfur can keep a liquid state for a long time after the temperature reaches the melting point of the sulfur, so that time is provided for the full reaction of the coarse aggregate.
And the paraffin component is added, so that the volume shrinkage of the poured concrete can be reduced and the generation of cracks can be reduced in the solidification process.
Perlite or vermiculite which is not roasted at high temperature is selected as a main raw material, so that the cost is low. When the internal temperature of the concrete rises to a certain temperature, the volume of the concrete can expand by 6 to 20 times rapidly, so that the member is cracked and broken in a short time.
The fly ash is added, so that the concrete has better workability and water retention property, and the fluidity of the concrete is ensured by controlling the addition amount of the fly ash and the viscosity of the concrete.
The silicon micropowder is added, so that the compression resistance, the bending resistance, the impermeability and the wear resistance of the concrete can be improved.
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 (3)
1. The self-breaking concrete based on the magnetic thermal excitation is characterized by comprising the following components in percentage by weight: 300 parts of sulfur, 150 parts of Portland cement, 200 parts of fine aggregate, 500 parts of coarse aggregate, 20 parts of paraffin, 50 parts of magnetic powder and 30 parts of mineral filler, wherein the actually measured density of the mixed and stirred components is 2850kg/m3The coarse aggregate is vermiculite particles which are not roasted at high temperature and have the diameter of 10 mm-40 mm, and the fine aggregate is vermiculite sand which is not roasted at high temperature and has the diameter of 0.1 mm-5 mm; the magnetic powder is manganese zinc ferrite powder; the mineral filler is silicon micropowder.
2. The method for preparing self-breaking concrete based on magnetocaloric excitation according to claim 1, characterized in that it comprises the following steps:
step 1: weighing the following components in proportion: 300 parts of sulfur, 150 parts of Portland cement, 200 parts of fine aggregate, 500 parts of coarse aggregate, 20 parts of paraffin, 50 parts of magnetic powder and 30 parts of mineral filler;
step 2: uniformly stirring the coarse aggregate, the fine aggregate, the Portland cement and the magnetic powder, and heating to 100-120 ℃ to obtain a preheated aggregate mixture for later use;
and step 3: heating the sulfur to 135-146 ℃, and preserving the heat for 30min to ensure that the sulfur is completely melted;
and 4, step 4: and (3) mixing the preheated aggregate mixture prepared in the step (2) with the molten sulfur prepared in the step (3), adding paraffin and mineral filler, fully stirring in a heating stirrer, and keeping the temperature at 135-146 ℃ during stirring to finally obtain the self-breaking concrete based on magnetic thermal excitation.
3. The self-breaking concrete based on magnetocaloric excitation according to claim 1 is applied to pouring of a temporary supporting structure of deep foundation pit engineering of high-rise and super-high-rise buildings.
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| KR101672714B1 (en) * | 2016-05-02 | 2016-11-07 | 주식회사 청호 | A high early strength cement concrete composition having the improved self-healing, durability and strength for road pavement and a repairing method of road pavement using the same |
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| CN101736671A (en) * | 2009-12-07 | 2010-06-16 | 长安大学 | Microwave-absorbing asphalt concrete pavement material composition |
| KR101672714B1 (en) * | 2016-05-02 | 2016-11-07 | 주식회사 청호 | A high early strength cement concrete composition having the improved self-healing, durability and strength for road pavement and a repairing method of road pavement using the same |
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