CN108395182B - Composite heat-storage temperature-control ecological base material and preparation method thereof - Google Patents
Composite heat-storage temperature-control ecological base material and preparation method thereof Download PDFInfo
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- CN108395182B CN108395182B CN201810482330.7A CN201810482330A CN108395182B CN 108395182 B CN108395182 B CN 108395182B CN 201810482330 A CN201810482330 A CN 201810482330A CN 108395182 B CN108395182 B CN 108395182B
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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Abstract
The invention relates to the field of slope engineering, in particular to a composite heat storage temperature control ecological base material and a preparation method thereof. The phase-change material provided by the invention has the characteristics of heat storage, temperature control and the like while ensuring that the strength of the composite soil body meets the ecological protection requirement of the side slope, can adjust the temperature of soil and surrounding environment, prevents plants from dying in a high-temperature environment, and is a novel environment-friendly, economic and applicable slope protection composite base material.
Description
Technical Field
The invention relates to the field of slope engineering, in particular to a composite heat-storage temperature-control ecological base material and a preparation method thereof.
Background
By arranging (spraying or paving) the ecological protection base material on the side slope, the defects of insufficient fertility, poor water retention and the like of the soil body or rock body of the side slope can be effectively overcome, and a soil fertilizer layer is provided for the growth of slope protection plants. In the prior art, a soil body and a long-acting fertilizer are mixed to be used as a base material, the base material is limited by self weight and cost, the slope laying thickness is generally less than 10cm, the temperature of the base material is greatly influenced by the environment due to the thin thickness of the base material layer, and plants are easy to die under the conditions of high temperature in the afternoon in summer and low temperature in the early morning in winter. After the plants die, stem leaves wither and the root strength is reduced, so that the slope surface and surface runoff speed are increased, the slope protection effects such as water and soil conservation are weakened, and the slope stability safety coefficient is reduced.
Therefore, it is necessary to develop a slope ecological base material with new functions, and the phase change heat storage characteristics of the phase change material are utilized to actively adjust the slope surface temperature of the slope soil, so that the high-temperature action time of the slope surface can be effectively shortened in a high-temperature season, the temperature of the slope surface of the slope and the surface temperature of plants can be reduced, and the high-temperature diseases of the slope can be actively reduced, thereby protecting slope protection plants; the service life of the side slope is prolonged, the maintenance cost of the side slope is reduced, and the safety is improved; meanwhile, harmful substances and a large amount of heat emitted to the pavement environment from the slope can be reduced, the pavement aging speed is slowed down, and the durability of the pavement asphalt material is improved.
Disclosure of Invention
Aiming at the negative influence of high-temperature climatic conditions on the ecological side slope, the applicant prepares a composite temperature-control ecological base material with a phase-change heat storage function by adopting a composite technology based on a phase-change heat storage theory. The composite temperature-control ecological base material prepared by the invention has the functions of heat storage, temperature control and the like while ensuring that the self strength of the soil body meets the ecological protection of the side slope, and has the effect of preventing and treating the death of the insolation of slope protection plants in a high-temperature severe environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite heat-storage temperature-control ecological base material comprises the following steps:
(1) dispersing polyethylene glycol in epoxy resin glue, and uniformly stirring to obtain a mixed solution;
(2) stirring the mixed solution obtained in the step (1) in a water bath at 50-70 ℃ until the mixed solution is completely gelled to obtain a composite gel;
(3) aging the composite gel in the step (2) at room temperature for 8-12 h, then putting the gel into a drying oven for drying, cooling to room temperature, and grinding into polyethylene glycol powder;
(4) adding a curing agent into dry raw material soil, uniformly mixing, adding water, and uniformly stirring for the first time; sequentially adding carbon fibers, a soil conditioner and the polyethylene glycol powder prepared in the step (3), and uniformly stirring for the second time to obtain a composite heat-storage temperature-control ecological base material;
the mass ratio of the dry raw material soil, the curing agent, the water, the carbon fiber, the soil conditioner and the polyethylene glycol powder added in the step (4) is 1 (0.05-0.15): (0.6-0.75): 0.01-0.05): 0.005-0.01): 0.01-0.05), preferably 1:0.15:0.7, (0.01-0.03):0.01: (0.03-0.05), and most preferably 1:0.15:0.7:0.01:0.01: 0.05.
Further, in the step (1), the polyethylene glycol is PEG2000, the addition amount of the polyethylene glycol is 30% -80% of the mass of the epoxy resin adhesive, preferably 50% -60%, and the epoxy resin adhesive is a high-thermal-conductivity epoxy resin adhesive, preferably a Hasuncast6213FR type high-thermal-conductivity epoxy resin adhesive.
Further, the curing agent in the step (4) is 42.5-grade ordinary portland cement.
Further, the raw material soil in the step (4) is viscous soil or silty clay rich in organic matters, and is preferably riverway mucky soil, slope protection sediments or pond sludge and the like.
Further, the carbon fiber in the step (4) is 6mm grade chopped carbon fiber.
Further, the soil conditioner in the step (4) is anionic polyacrylamide with the molecular weight of 800 ten thousand.
Further, the stirring speed in the first uniform stirring process in the step (4) is 110 r/min-125 r/min.
Further, in the second uniform stirring process in the step (4), the stirring speed is 50r/min to 70r/min, and the stirring time is 10min to 15 min.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention aims to provide a novel composite heat-storage temperature-control ecological base material, which is prepared by preparing a heat-storage carrier (a mixture of PEG powder and epoxy resin) by utilizing the high latent heat characteristic of PEG, further mixing the heat-storage carrier with riverway silt soil, a curing agent (cement), a soil modifier (PAM) and water according to a certain proportion, and stirring and compacting the mixture. The invention not only meets the strength requirement of ecological protection, but also has the functions of heat storage, temperature control and the like, prevents slope protection plants from dying under high-temperature severe environment, and is a novel green, environment-friendly, economical and applicable composite material.
In the raw materials, the PEG2000 phase change temperature has wide selection range, high phase change latent heat, low phase change enthalpy thermal hysteresis effect, no supercooling and phase separation phenomena, no toxicity, no stimulation, no volatility, stable chemical properties and good thermal stability, and is widely applied to the fields of solar energy utilization, building energy conservation, spinning and the like; the high-heat-conductivity epoxy resin adhesive has the advantages of stable structure, large specific surface area, good adsorption performance, high heat conductivity coefficient and low price, does not generate chemical reaction when being mixed with polyethylene glycol 2000, and has good shaping function, so that the polyethylene glycol 2000 is solid before and after phase change and has no leakage; the soil body without the fibers is easy to loosen and break, the strength is suddenly lost, after the fibers are added, the peak strength, the residual strength, the toughness, the integrity and the brittle failure mode of the base material can be improved, the soil body is prevented from being suddenly damaged, and the chopped carbon fibers are added into the soil body, so that the effects are achieved, the heat transfer rate in the soil body is increased, the heat loss is reduced, and the temperature is effectively reduced; PAM can increase the cohesive force among soil surface layer particles, wherein PAM anion flocculant has good water retention effect due to large viscosity, low price, and can be used in concrete to significantly improve the flexural strength, bonding strength, bending toughness and abrasion resistance, and reduce the folding ratio, permeability and contractibility.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to specific examples. It should be understood that the examples given are for the purpose of further illustrating the subject invention and should not be construed in any way as limiting the scope of the invention:
embodiment 1 a composite heat-storage temperature-control ecological base material is prepared by the following method:
mixing polyethylene glycol (PEG 2000) and Hasuncast6213FR type high-heat-conductivity epoxy resin glue at room temperature according to a mass ratio of 1:2, and fully stirring the mixed solution of the polyethylene glycol and the epoxy resin glue by using an electric stirrer until polyethylene glycol flakes or powder completely disappear, so that the polyethylene glycol is uniformly dispersed in the epoxy resin glue; then stirring the mixed solution under the water bath heating condition, adjusting the water bath temperature to 60 ℃, and continuously stirring until the mixed solution is completely gelled to obtain a composite gel; aging the composite gel at room temperature for 12h, then placing the composite gel into an oven at 80 ℃ for forced air drying for 15h, cooling to room temperature, and then grinding to obtain PEG powder.
Taking sludge of the river channel of the Wuhan patrol river as raw material soil, drying the raw material soil by an oven, sieving the dried raw material soil by a sieve of 1mm, taking 150g as sample soil, adding 22.5g of curing agent (42.5-grade ordinary portland cement) into the sample soil, and uniformly mixing; adding 105g of water into the soil, and then uniformly stirring the mixture in a stirrer at a speed of 125r/min to ensure that the soil is rapidly in a soft plastic-flow plastic state to obtain a mixture; adding carbon fiber, soil conditioner and PEG powder into the mixture in sequence according to a certain mixing ratio; the soil conditioner is characterized in that the carbon fibers are 6 mm-grade chopped carbon fibers from Nippon, the mixing amount of the carbon fibers is 4.5g, the soil conditioner is anionic PAM with the molecular weight of 800 ten thousand, the mixing amount of the soil conditioner is 1.5g, and PEG powder is prepared by the steps in the embodiment and the mixing amount of the PEG powder is 4.5 g; and stirring the mixture at the speed of 60r/min for 10min to form the composite heat-storage temperature-control ecological base material.
Then dividing the prepared composite heat-storage temperature-control ecological base material into 3 layers, compacting by 25 strokes of each layer, and loading into a sample preparation device (with the diameter of 39.1mm and the height of 80.0 mm); placing the prepared sample and the sample preparation device into a standard curing box for curing at the temperature of (20 +/-2) DEG C and the relative humidity of more than 95 percent, demolding after curing for 24 hours and continuing curing; and after the sample is maintained to the design age of 28d, taking out and weighing about 70g, and performing an unconfined compressive strength test to obtain a sample soil body strength of 530kPa, wherein the strength meets the design requirement of ecological slope fixation.
The prepared composite heat storage temperature control ecological base material and raw material soil without any treatment are respectively prepared into test pieces with the specification of 20cm multiplied by 3cm, and the test pieces are placed in a temperature simulation test box for temperature simulation test. The temperature simulation test was conducted with the air temperature (highest temperature reached 43.4 ℃) at 30cm from the ground in 8, 5 and 2017. The comprehensive thermal analyzer tests show that the composite heat storage and temperature control ecological base material starts to change phase to store heat when the surface temperature is 44.7 ℃, the temperature change starts to delay, the peak value is reached at 63.5 ℃, the phase change latent heat is 103.1J/g, the surface peak temperature of the raw material soil without any treatment is 66.7 ℃, and the peak value temperature of the surface of the composite heat storage and temperature control ecological base material is reduced by 3.2 ℃ in a same ratio.
In order to carry out an accelerated thermal cycle test, the temperature cycle time of 24 hours a day is compressed to 4 hours, and after 30 times of cycle experiments, the peak temperature of the surface of the composite heat storage temperature control ecological base material is 63.2 ℃, the peak temperature of the surface of the raw material soil without any treatment is 66.5 ℃, and the peak temperature of the surface of the composite heat storage temperature control ecological base material is reduced by 3.3 ℃ in year-on-year. Through 60 times of cycle tests, the surface peak temperature of the composite heat storage and temperature control ecological base material is 63.4 ℃, the surface peak temperature of the raw material soil without any treatment is 66.6 ℃, the surface peak temperature of the composite heat storage and temperature control ecological base material is reduced by 3.2 ℃ in the same ratio, and through 30 times and 60 times of cycle tests, the surface peak temperature of the composite heat storage and temperature control ecological base material is lower than that of the raw material soil without any treatment, the difference of the two reduction values is only 0.1 ℃, the temperature reduction performance is not obviously attenuated, and the temperature reduction effect is good. As the high-temperature environment of 43.4 ℃ is simulated in each thermal cycle, the duration time of the high temperature in hot areas in summer is about 20 d-30 d, and 60 continuous thermal cycles are equivalent to the high-temperature action of 2-3 years, the composite heat-storage temperature-control ecological base material is proved to have good application feasibility.
Digging 10cm × 10cm × 10cm experimental blocks on a slope, separating the blocks from the surrounding by using partition plates, preparing composite heat-storage and temperature-control ecological base materials with corresponding volumes according to the proportion and the method of the embodiment, filling the composite heat-storage and temperature-control ecological base materials into the experimental blocks, and sowing seeds of slope protection plants, namely Bermuda grass, into the experimental blocks, wherein the sowing amount is 400 plants/block (10.00 g/m)2) After 8 days, the plants begin to bud, and completely bud after 14 days, and the bud amount of the bermudagrass is measured to be 280 plants/block, which proves that slope protection plants can normally grow on the composite heat storage and temperature control ecological base material.
Embodiment 2 a composite heat-storage temperature-control ecological base material is prepared by the following method:
mixing polyethylene glycol (PEG 2000) and Hasuncast6213FR type high-heat-conductivity epoxy resin glue at room temperature according to a mass ratio of 3:5, and fully stirring the mixed solution of the polyethylene glycol and the epoxy resin glue by using an electric stirrer until polyethylene glycol flakes or powder completely disappear, so that the polyethylene glycol is uniformly dispersed in the epoxy resin glue; then stirring the mixed solution under the water bath heating condition, adjusting the water bath temperature to 60 ℃, and continuously stirring until the mixed solution is completely gelled to obtain a composite gel; aging the composite gel at room temperature for 12h, then placing the composite gel into an oven at 80 ℃ for forced air drying for 15h, cooling to room temperature, and then grinding to obtain PEG powder.
Taking sludge of the river channel of Wuhan patrol river as raw material soil, drying the soil by an oven, sieving the soil by a sieve of 1mm, taking 150g of the soil as sample soil, adding 7.5g of curing agent (42.5-grade ordinary portland cement), uniformly mixing, adding 105g of water, and uniformly stirring in a stirrer at a speed of 125r/min to enable the soil body to be in a soft-plastic-flow-plastic state quickly to obtain a mixture; adding carbon fiber, soil conditioner and PEG powder into the mixture in sequence according to a certain mixing ratio; wherein, the carbon fiber is 6mm grade short carbon fiber from Nippon, and the mixing amount is 1.5 g; the soil conditioner adopts 800 ten thousand molecular weight anionic PAM, and the mixing amount is 1.5 g; the PEG powder is prepared by the above steps of this embodiment, the mixing amount is 7.5g, and the above mixture is stirred at a speed of 60r/min for 10min to form the composite heat-storage temperature-control ecological base material.
Then dividing the prepared composite heat-storage temperature-control ecological base material into 3 layers, compacting by 25 strokes of each layer, and loading into a sample preparation device (with the diameter of 39.1mm and the height of 80.0 mm); placing the prepared sample and the sample preparation device into a standard curing box for curing at the temperature of (20 +/-2) DEG C and the relative humidity of more than 95 percent, demolding after curing for 24 hours and continuing curing; and after the sample is maintained to the design age of 28d, taking out and weighing about 71g, and performing an unconfined compressive strength test to obtain a sample soil body strength of 430kPa, wherein the strength meets the design requirement of ecological slope fixation.
The prepared composite heat storage temperature control ecological base material and raw material soil without any treatment are respectively prepared into test pieces with the specification of 20cm multiplied by 3cm, and the test pieces are placed in a temperature simulation test box for temperature simulation test. The temperature simulation test was conducted with the air temperature (highest temperature reached 43.4 ℃) at 30cm from the ground in 8, 5 and 2017. The comprehensive thermal analyzer tests show that the composite heat storage and temperature control ecological base material starts to change phase to store heat when the surface temperature is 44.1 ℃, the temperature change starts to delay, the peak value is reached at 60.5 ℃, the phase change latent heat is 108.1J/g, the surface peak temperature of the raw material soil without any treatment is 66.7 ℃, and the peak value temperature of the surface of the composite heat storage and temperature control ecological base material is reduced by 6.2 ℃ in a same ratio.
In order to carry out an accelerated thermal cycle test, the temperature cycle time of 24 hours a day is compressed to 4 hours, and after 30 times of cycle experiments, the peak temperature of the surface of the composite heat storage temperature control ecological base material is 60.2 ℃, the peak temperature of the surface of the raw material soil without any treatment is 66.5 ℃, and the peak temperature of the surface of the composite heat storage temperature control ecological base material is reduced by 6.3 ℃ in year-on-year. Through 60 times of cycle tests, the surface peak temperature of the composite heat storage and temperature control ecological base material is 60.4 ℃, the surface peak temperature of the raw material soil without any treatment is 66.6 ℃, the surface peak temperature of the composite heat storage and temperature control ecological base material is reduced by 6.2 ℃ in the same ratio, and through 30 times and 60 times of cycle tests, the surface peak temperature of the composite heat storage and temperature control ecological base material is lower than that of the raw material soil without any treatment, the difference of the two reduction values is only 0.1 ℃, the temperature reduction performance is not obviously attenuated, and the temperature reduction effect is good. As the high-temperature environment of 43.4 ℃ is simulated in each thermal cycle, the duration time of the high temperature in hot areas in summer is about 20 d-30 d, and 60 continuous thermal cycles are equivalent to the high-temperature action of 2-3 years, the composite heat-storage temperature-control ecological base material is proved to have good application feasibility.
Digging 10cm × 10cm × 10cm experimental blocks on a slope, separating the blocks from the surrounding by using partition plates, preparing composite heat-storage and temperature-control ecological base materials with corresponding volumes according to the proportion and the method of the embodiment, filling the composite heat-storage and temperature-control ecological base materials into the experimental blocks, and sowing seeds of slope protection plants, namely Bermuda grass, into the experimental blocks, wherein the sowing amount is 400 plants/block (10.00 g/m)2) After 7 days, sprouting begins, sprouting is finished after 15 days, and the sprouting amount of bermudagrass is measured to be 340/block, which proves that slope protection plants can grow normally on the composite heat storage and temperature control ecological base material.
Claims (1)
1. The composite heat-storage temperature-control ecological base material is characterized by being prepared by the following method:
(1) dispersing polyethylene glycol in epoxy resin glue, and uniformly stirring to obtain a mixed solution;
(2) stirring the mixed solution obtained in the step (1) in a water bath at 50-70 ℃ until the mixed solution is completely gelled to obtain a composite gel;
(3) aging the composite gel in the step (2) at room temperature for 8-12 h, then putting the composite gel into a drying oven for drying, cooling to room temperature, and grinding into polyethylene glycol powder;
(4) adding a curing agent into dry raw material soil, uniformly mixing, adding water, and uniformly stirring for the first time; sequentially adding carbon fibers, a soil conditioner and the polyethylene glycol powder prepared in the step (3), and uniformly stirring for the second time to obtain a composite heat-storage temperature-control ecological base material;
in the step (1), the polyethylene glycol is PEG2000, the addition amount of the polyethylene glycol is 30-80% of the mass of the epoxy resin adhesive, and the epoxy resin adhesive is a high-thermal-conductivity epoxy resin adhesive;
the mass ratio of the dry raw material soil, the curing agent, the water, the carbon fiber, the soil conditioner and the polyethylene glycol powder added in the step (4) is 1 (0.05-0.15): (0.6-0.75): 0.01-0.05): 0.005-0.01): 0.01-0.05);
the curing agent in the step (4) is 42.5-grade ordinary portland cement; the raw material soil is viscous soil or silty clay rich in organic matters; the carbon fiber is 6mm grade chopped carbon fiber; the soil conditioner is anionic polyacrylamide with the molecular weight of 800 ten thousand;
the stirring speed in the first uniform stirring process in the step (4) is 110-125 r/min; in the second uniform stirring process, the stirring speed is 50-70 r/min, and the stirring time is 10-15 min.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101230256A (en) * | 2008-01-04 | 2008-07-30 | 华南理工大学 | Method for preparing polyethylene glycol and epoxy resin formed composite phase-change materials |
| CN104878765A (en) * | 2015-03-27 | 2015-09-02 | 三峡大学 | Multifunctional combined type ecological slope protection substrate |
| WO2016021899A1 (en) * | 2014-08-04 | 2016-02-11 | 주식회사 엘지화학 | Surface-modified nanoclay for preparing superabsorbent resin, and neutralization solution for preparing superabsorbent resin |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101230256A (en) * | 2008-01-04 | 2008-07-30 | 华南理工大学 | Method for preparing polyethylene glycol and epoxy resin formed composite phase-change materials |
| WO2016021899A1 (en) * | 2014-08-04 | 2016-02-11 | 주식회사 엘지화학 | Surface-modified nanoclay for preparing superabsorbent resin, and neutralization solution for preparing superabsorbent resin |
| CN104878765A (en) * | 2015-03-27 | 2015-09-02 | 三峡大学 | Multifunctional combined type ecological slope protection substrate |
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