CN116199484B - SAP-containing cement-based aircraft interception material and preparation method thereof - Google Patents
SAP-containing cement-based aircraft interception material and preparation method thereof Download PDFInfo
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- CN116199484B CN116199484B CN202310465850.8A CN202310465850A CN116199484B CN 116199484 B CN116199484 B CN 116199484B CN 202310465850 A CN202310465850 A CN 202310465850A CN 116199484 B CN116199484 B CN 116199484B
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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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- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/08—Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons
- C04B16/082—Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons other than polystyrene based, e.g. polyurethane foam
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the field of concrete, in particular to an SAP-containing cement-based aircraft interception material and a preparation method thereof.
Description
Technical Field
The invention relates to the field of concrete, in particular to an SAP-containing cement-based aircraft interception material and a preparation method thereof.
Background
Take-off and landing overruns are the main cause of accidents occurring on or near runways, which can cause accidental aircraft damage and casualties. With the rapid development of science and technology, how to improve the safety level of runways has become the subject of worldwide research. In order to reduce the risk of overrun accidents, the International Civil Aviation Organization (ICAO) requires a runway safety area 300 meters beyond the end of the runway, which may provide sufficient space to prevent overrun aircraft. However, the outside topography of the runway end safety zone is very complex, and the runway end safety zone often cannot reach the standard, so that the flight safety risk is high. It is then necessary to provide a arresting system at the end of the runway.
Document 1 (Hu Dongping, zhang Xuguang, tan Jinlan. Research on preparation of autoclaved aerated concrete from limestone tailings [ J ]. Nonmetallic minerals, 2021,44 (05): 92-94.) discloses a method for preparing porous concrete with aluminum paste as an air entraining agent. The technology takes siliceous limestone tailings, quartz sand, cement, lime and gypsum as main raw materials, and aluminum powder paste as an air entraining agent to prepare autoclaved aerated concrete. Document 2 (Dan Yanyu. Study of influence of cell structure on foam concrete properties [ D ]. University of Jinan, 2022) discloses a method for preparing foam concrete using a foaming agent. The technology is to add foam prefabricated by an air foaming machine into mortar to prepare foam concrete.
The disadvantages of the above technology are: (1) Document 1 has a high surface free energy of fine bubbles generated by incorporating an air entraining agent into concrete, and the fine bubbles tend to synthesize large bubbles during the stirring of concrete. (2) In addition, since the density of the air bubbles is smaller than that of the concrete, there is a tendency for the air bubbles to escape from the aerated concrete. The air holes generated by adding the aluminum powder paste can lose a large amount of air bubbles in the long-time mixing process of the concrete, the air hole system characteristics in the aerated filling concrete can not be accurately regulated and controlled by utilizing the aluminum powder paste, and then the compressive strength and compactness of the concrete are affected, so that the performance fluctuation of the concrete is larger. Making it a certain risk as a material for aircraft interception systems. (3) In the method disclosed in document 2, the foam concrete prepared by using the foaming agent can enable a plurality of independent pores to be overlapped and evolved into overlapped pores in the forming process, so that the number of communication pores is increased, the average pore diameter of the porous concrete is increased, and the compressive strength and compactness of the concrete are further affected. (4) In the concrete of document 2, na+ and k+ damage the foam, so that pores generated by the foam are open pores, and the workability of the concrete is further affected. And foam concrete prepared by the foaming agent generally has poor durability.
An SAP is a material that can expand and contract to deform, and can absorb water in concrete to expand, and when the humidity is lowered, the SAP can release water and contract. According to the characteristic, the SAP-based lightweight low-strength cement-based material can be prepared by mixing the SAP with cement, and the inventor has made a great deal of practice on introducing micropores into concrete by the SAP, however, the prior art does not adopt the SAP to prepare an aircraft interception material, but adopts a foaming agent to foam.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention utilizes SAP to perform experimental exploration on the cement-based aircraft interception material, obtains SAP particles with the particle size of 0.40-0.60 mm through screening, and then performs pretreatment on the SAP to control the expansion multiplying power of the SAP particles, so that the pore diameter, the pore spacing and the porosity of SAP pores can be regulated and controlled, namely the pore structure characteristics of the SAP pores are designed, and the compressive strength and the density of the cement-based material are regulated, so that the cement-based material accords with the strength and the density of an aircraft interception system. The SAP cement-based aircraft interception material can effectively intercept and stop an aircraft rushing out of a runway without causing passenger injury or death and structural damage of the aircraft.
Specifically, the preparation method of the SAP-containing cement-based aircraft interception material comprises the following steps:
s1, grinding and sieving SAP to obtain SAP particles,
s2, soaking SAP particles in a calcium nitrate solution, stirring, filtering, soaking in an aluminum sulfate solution, stirring, filtering to obtain modified SAP particles,
s3, placing cement and modified SAP particles into a stirrer for fully mixing,
s4, dissolving the water reducer and the thickener in water, adding the water reducer and the thickener into a stirrer, adding the air entraining agent, uniformly mixing to obtain cement-based slurry,
and S5, pouring and molding the cement-based slurry, demolding after 1 day, and curing to obtain the cement-based slurry.
Preferably, the step S1SAP is an irregularly shaped acrylic crosslinked acrylamide type water absorbent resin.
Preferably, the grinding in the step S1 adopts a planetary ball mill, the rotating speed is 2000-3000r/min, the grinding time is 10-15min, and the particle size of the SAP particles after sieving is 0.4-0.6mm. More preferably, the planetary ball mill is model XQM-4L.
Preferably, the concentration of the calcium nitrate solution in the step S2 is 0.1-0.2mol/L, the soaking time is 5-6h, the solubility of the aluminum sulfate solution is 0.3-0.4mol/L, and the soaking time is 2-3h.
Preferably, the cement in the step S3 is at least one of ordinary Portland cement, portland cement and sulphoaluminate cement, and the mixing amount of the modified SAP particles is 4-5% of the mass of the cement.
Preferably, the step S4 water reducer is a polycarboxylate water reducer, the solid content is 20-25%, and the mixing amount is 0.2-0.5% of the cement mass; the thickening agent is cellulose ether, and the mixing amount is 0.2-0.4% of the mass of the cement.
Preferably, the air entraining agent in the step S4 is sodium dodecyl benzene sulfonate or sodium dodecyl sulfate, and the mixing amount is 0.05-0.2% of the mass of the cement.
Preferably, the cement-based slurry of step S4 has a water to gel ratio of 0.7 to 0.8.
Preferably, the stirring system of the step S4 can be carried out by referring to GB/T25181-2019 ready mixed mortar.
Preferably, the curing in step S5 is performed under standard conditions, and the curing time is 28 days.
The invention also relates to an SAP-containing cement-based aircraft interception material, and in particular relates to an SAP-containing cement-based aircraft interception material prepared by the preparation method.
The invention introduces designable SAP holes in the cement-based material by adding modified SAP particles, the prior art mainly utilizes the water absorption-water release effect of the added SAP to play an internal curing role so as to improve the mechanical property of the cement-based material, the invention utilizes the water release of the modified SAP particles to increase the water-gel ratio of the cement-based material so as to cause the reduction of the mechanical property of the cement-based material, and in particular, the modified SAP particles absorb water to expand in the mixing stage of the cement-based material, and then the modified SAP particles release water and shrink to form the SAP holes along with the reduction of the internal humidity of the cement-based material, and the water release of the modified SAP particles can cause the increase of the water-gel ratio of the cement-based material. According to the invention, the particle size and the water absorption rate of the modified SAP particles are accurately designed, so that the aperture, the pore spacing and the porosity of the SAP pores can be regulated and controlled, and the light low-strength cement-based material suitable for an aircraft interception system is prepared.
The invention has the following characteristics and excellent effects:
1. the modified SAP particles subjected to grinding, screening and pretreatment are added with the air entraining agent, so that the modified SAP particles can be uniformly distributed in the cement-based material;
2. according to the invention, the diameter of the SAP holes, the hole spacing and the porosity can be accurately regulated and controlled by accurately designing the particle diameter of the SAP and the water absorption rate of the modified SAP particles;
3. the invention controls the compressive strength and the energy absorption efficiency of the cement-based material by precisely regulating and controlling the SAP pore characteristics;
4. the SAP-containing cement-based aircraft interception material has the advantages of simple preparation method, low cost and convenient engineering popularization.
Detailed Description
In order to characterize the technical effect of the invention, crushing experiments are carried out on experimental examples, the strength obtained by a typical stress crushing curve is used as an index, and after the curing reaches a specified age, samples are taken according to the standard MH/T5111-2015 of civil aviation industry, namely, a characteristic material blocking system, and the performance of the samples is tested. The research of the invention shows that the collapse strength of the concrete for aircraft interception is more reasonable from 0.300 MPa to 0.350 MPa.
In the test process, the cement adopts P.O42.5 ordinary Portland cement; the SAP is acrylic acid cross-linked acrylamide, the particle size of the SAP particles after sieving is 0.40-0.60 mm, and the doping amount of the modified SAP particles is 4% of the mass of cement; the thickener adopts hydroxypropyl methyl cellulose ether, and the mixing amount is 0.4% of the mass of the cement; the water reducer is a polycarboxylate water reducer, and the mixing amount is 0.2% of the mass of cement; the air entraining agent is sodium dodecyl sulfate, and the mixing amount is 0.1% of the mass of cement; the water-gel ratio of the cement-based material is 0.8.
Example 1
The preparation method of the SAP-containing cement-based aircraft interception material comprises the following steps:
s1, grinding and sieving SAP to obtain SAP particles,
s2, soaking SAP particles in a calcium nitrate solution, stirring, filtering, soaking in an aluminum sulfate solution, stirring, filtering to obtain modified SAP particles,
s3, placing cement and modified SAP particles into a stirrer for fully mixing,
s4, dissolving the water reducer and the thickener in water, adding the water reducer and the thickener into a stirrer, adding the air entraining agent, uniformly mixing to obtain cement-based slurry,
and S5, pouring and molding the cement-based slurry, demolding after 1 day, and curing to obtain the cement-based slurry.
Through detection, the cement-based slurry has good working performance and crushing strength of 0.34MPa.
Comparative example 1
The preparation method of the aircraft interception material comprises the following steps:
s1, grinding and sieving SAP to obtain SAP particles,
s2, soaking the SAP particles in water, stirring, filtering to obtain water-saturated SAP particles,
s3, placing the cement and water-saturated SAP particles into a stirrer for fully mixing,
s4, dissolving the water reducer and the thickener in water, adding the water reducer and the thickener into a stirrer, adding the air entraining agent, uniformly mixing to obtain cement-based slurry,
and S5, pouring and molding the cement-based slurry, demolding after 1 day, and curing to obtain the cement-based slurry.
Through detection, the bleeding of the cement-based slurry is accompanied by segregation, the crushing strength is 0.12MPa, the crushing strength of a test piece is low, the crushing absorption energy is smaller, and the blocking efficiency is insufficient.
Comparative example 2
The preparation method of the aircraft interception material comprises the following steps:
s1, grinding and sieving SAP to obtain SAP particles,
s2, soaking the SAP particles in aluminum sulfate solution, stirring, filtering to obtain modified SAP particles,
s3, placing cement and modified SAP particles into a stirrer for fully mixing,
s4, dissolving the water reducer and the thickener in water, adding the water reducer and the thickener into a stirrer, adding the air entraining agent, uniformly mixing to obtain cement-based slurry,
and S5, pouring and molding the cement-based slurry, demolding after 1 day, and curing to obtain the cement-based slurry.
Through detection, bleeding occurs on the surface of the cement-based slurry, the working performance of the cement-based slurry is affected, the crushing strength of the test piece is 0.23MPa, the crushing strength of the test piece is low, the crushing absorption energy is smaller, and the blocking efficiency is insufficient.
Comparative example 3
The preparation method of the aircraft interception material comprises the following steps:
s1, grinding and sieving SAP to obtain SAP particles,
s2, soaking SAP particles in a calcium nitrate solution, stirring, filtering, soaking in an aluminum sulfate solution, stirring, filtering to obtain modified SAP particles,
s3, placing cement and modified SAP particles into a stirrer for fully mixing,
s4, dissolving the water reducer and the thickener in water, adding the water reducer and the thickener into a stirrer, uniformly mixing to obtain cement-based slurry,
and S5, pouring and molding the cement-based slurry, demolding after 1 day, and curing to obtain the cement-based slurry.
Through detection, cement-based slurry has poor fluidity, modified SAP particles float upwards to cause unsmooth surface, the crushing strength is 0.57MPa, the crushing strength of a test piece is high, the crushing depth of a wheel rolling interception material is insufficient, the blocking efficiency is influenced, and the undercarriage structure can bear overlarge resistance to break.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The preparation method of the SAP-containing cement-based aircraft interception material is characterized by comprising the following steps of:
s1, grinding and sieving SAP to obtain SAP particles,
s2, soaking SAP particles in a calcium nitrate solution, stirring, filtering, soaking in an aluminum sulfate solution, stirring, filtering to obtain modified SAP particles,
s3, placing cement and modified SAP particles into a stirrer for fully mixing,
s4, dissolving the water reducer and the thickener in water, adding the water reducer and the thickener into a stirrer, adding the air entraining agent, uniformly mixing to obtain cement-based slurry,
and S5, pouring and molding the cement-based slurry, demolding after 1 day, and curing to obtain the cement-based slurry.
2. The method for preparing an SAP-containing cement-based aircraft interception material according to claim 1, wherein step S1SAP is an irregularly shaped acrylic crosslinked acrylamide type water absorbent resin.
3. The method for preparing the SAP-containing cement-based aircraft interception material according to claim 1, wherein the grinding in step S1 adopts a planetary ball mill with a rotation speed of 2000-3000r/min, the grinding time is 10-15min, and the particle size of SAP particles after sieving is 0.4-0.6mm.
4. The method for preparing the SAP-containing cement-based aircraft interception material according to claim 1, wherein the concentration of the calcium nitrate solution in the step S2 is 0.1-0.2mol/L, the soaking time is 5-6h, the solubility of the aluminum sulfate solution is 0.3-0.4mol/L, and the soaking time is 2-3h.
5. The method for preparing the SAP-containing cement-based aircraft interception material according to claim 1, wherein the cement in step S3 is at least one of Portland cement, portland cement and sulphoaluminate cement, and the mixing amount of the modified SAP particles is 4-5% of the mass of the cement.
6. The preparation method of the SAP-containing cement-based aircraft interception material according to claim 1, wherein the water reducer in the step S4 is a polycarboxylate water reducer, the solid content is 20-25%, and the mixing amount is 0.2-0.5% of the mass of cement; the thickening agent is cellulose ether, and the mixing amount is 0.2-0.4% of the mass of the cement.
7. The method for preparing the SAP-containing cement-based aircraft interception material according to claim 1, wherein the air entraining agent in the step S4 is sodium dodecyl benzene sulfonate or sodium dodecyl sulfate, and the mixing amount is 0.05-0.2% of the mass of cement.
8. The method for preparing an SAP-containing cement-based aircraft interception material according to claim 1, wherein the cement-based slurry in step S4 has a water-to-gel ratio of 0.7 to 0.8.
9. The method for preparing the SAP-containing cement-based aircraft interception material according to claim 1, wherein the curing in step S5 is performed under standard conditions, and the curing time is 28 days.
10. An SAP-containing cement-based aircraft interception material, characterized in that it is prepared by the preparation method according to any one of claims 1 to 9.
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| CN113416090A (en) * | 2021-07-01 | 2021-09-21 | 石家庄铁道大学 | Can perform CO2Preparation method of trapped SAP (super absorbent Polymer) hole-containing system breathable mortar |
| CN115677313A (en) * | 2022-12-29 | 2023-02-03 | 石家庄铁道大学 | Anti-freezing enhanced mine filling material and preparation method thereof |
-
2023
- 2023-04-27 CN CN202310465850.8A patent/CN116199484B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041799A (en) * | 2010-11-17 | 2011-05-04 | 南京工业大学 | Manufacturing method of water retaining and absorbing dam for intercepting fire-fighting wastewater |
| CN104230280A (en) * | 2014-09-12 | 2014-12-24 | 武汉理工大学 | Low-shrinkage sludge ceramsite alkali-activated full-slag foam concrete plate and preparation method thereof |
| CN105061961A (en) * | 2015-08-26 | 2015-11-18 | 北京理工大学 | Salt tolerance super water-absorbent resin |
| CN110734243A (en) * | 2019-11-01 | 2020-01-31 | 北京工业大学 | SAPs microcapsule and cement-based self-repairing material |
| CN113416090A (en) * | 2021-07-01 | 2021-09-21 | 石家庄铁道大学 | Can perform CO2Preparation method of trapped SAP (super absorbent Polymer) hole-containing system breathable mortar |
| CN115677313A (en) * | 2022-12-29 | 2023-02-03 | 石家庄铁道大学 | Anti-freezing enhanced mine filling material and preparation method thereof |
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