CN104804442B - Salinization particle for micro-surfacing of asphalt pavement and preparation method thereof - Google Patents
Salinization particle for micro-surfacing of asphalt pavement and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of preparation of asphalt pavement materials, and discloses a salinization particle for micro-surfacing of an asphalt pavement and a preparation method thereof. The salinization product particles comprise the following raw material components: salt powder, bisphenol A epoxy resin, polyamine curing agent, aromatic oil, polyolefin and layered silicate; the preparation method comprises the following steps: the preparation method comprises the following steps of putting the raw material components of the salt particles into a mixing barrel, mixing, heating and stirring to form a uniform bulk plastic body, curing, extruding, granulating, cutting and finally curing the bulk plastic body. The salinized substance particles can be used for asphalt pavement maintenance engineering, can realize the self snow melting function of asphalt pavement, and have important practical significance and engineering application value.
Description
Technical Field
The invention relates to the field of preparation of asphalt pavement materials, in particular to a salinization particle for micro-surfacing of an asphalt pavement and a preparation method thereof.
Background
In most areas in the north of China, in southwest plateaus and middle mountainous areas, snowfall and icing weather often occurs in winter, along with the icing of snow on road surfaces, the adhesion coefficient and the friction coefficient of automobile tires and the road surfaces are greatly reduced, so that the tires skid, the braking distance is prolonged, sideslip, direction out of control, side rollover and even disastrous traffic accidents are caused in serious cases.
At present, in order to ensure driving safety and road smoothness, technologies for removing snow and ice on roads at home and abroad mainly comprise an active snow removing technology and a passive snow removing technology. The passive snow removing technology mainly comprises a manual removing technology, a mechanical removing technology, a sand and stone material spreading method, a snow melting salt spreading method and the like; the active snow removing technology mainly comprises a thermal ice and snow melting technology and a freezing-inhibition paving technology.
Throughout various snow melting and deicing technologies, according to operability, construction cost and durability of the snow melting technology, a chemical freezing inhibition paving technology gradually becomes a mainstream snow melting and deicing technology, the technical core of the technology is research and development of self-snow melting materials, and a plurality of exploratory researches are carried out at home and abroad.
Abroad, the material for self-melting snow and ice is originated in Europe in the 60's of the 20 th century, and Dubois R of Switzerland is wrapped in CaCl by hemp seed oil2And NaOH, with Ca (OH)2After uniformly mixing, preparing a granular material with the diameter of 2-7 cm through processes of granulation molding, drying and the like; in 1976, Siegmund Werner et al added snow-melting materials to a porous lava aggregate and formed particles of a certain size, added the materials to asphalt mixtures in the form of aggregates, and gradually separated out effective snow-melting components under the rolling and abrasion action of vehicles to achieve the purpose of self-melting snow; in the 80 s of the 20 th century, the United states DOT company developed a chlorine-free environment-friendly snow-melting agent-calcium magnesium acetate with less influence on the environment; the Swiss successfully develops the composite self-snow-melting material taking calcium chloride as the main componentVerglimit, also known as V-260, is a concentrated chemical material, as the filler adds into bituminous mixture while mixing and producing, can prevent or slow down the icy road surface effectively; at the end of the 70 s of the 20 th century, the European and American technology for snow melting and ice suppression was introduced in Japan, and on the basis, Mafilon, also called MFL, which has similar characteristics to V-260, was developed; in 1985, Masuyamayoshinari applied the snow-melting and ice-suppressing technology to a water-permeable pavement, and developed a water-permeable snow-melting cement pavement; in 1988, Americans Terence. E.Peel made LMWBL snow-melting materials by utilizing papermaking waste liquid and applied for patent, the LMWBL snow-melting materials can be used in alpine regions, but because the manufacturing cost is high, large-scale production is not carried out all the time; the snow-melting and ice-suppressing material based on acetate is developed by Hechester corporation of Germany in 1992, and the effective component of the snow-melting and ice-suppressing material is 15% -70% of sodium acetate or potassium acetate or the mixture of the sodium acetate and the potassium acetate.
In China, the research on the self-snow-melting ice-suppressing material is started late, and since 2008, foreign self-snow-melting ice-suppressing materials, Swiss V-260 and Japanese MFL products are introduced. Subsequently, engineering technicians develop self-snow-melting materials with independent intellectual property rights successively, Changan university successfully develops a salinized substance granular material for inhibiting ice and snow on road pavement from freezing, and the salinized substance granular material is applied to winter maintenance engineering of a plurality of domestic expressways and national and provincial roads; the first highway investigation and design research institute company Limited of China developed a snow-melting coating technology; a novel snow-melting agent developed by jointly utilizing partial oceans and plant extract at the municipal maintenance and management department of the national academy of sciences and the Qingdao city; the compound snow-melting agent is developed at the industrial university of Hebei and the management department of Xuan big expressway in Hebei province.
From the above self-snow-melting and ice-suppressing materials at home and abroad, the snow-melting and ice-suppressing materials generally used mainly include three types: the first type is acetate ice inhibiting material; the second type is a chlorine salt type ice inhibiting material; and the other is biological extract.
The self-snow-melting ice-suppressing material in the self-snow-melting salinized asphalt pavement has two main using modes: the first is that the self-snow-melting ice-suppressing material is combined with the macromolecule reaction coating material, and proper amount of anti-abrasion type fine aggregate is added, and the mixture is sprayed on the road surface and is solidified to form a snow-melting coating; in the ice and snow season, the effective components of the salt in the snow melting coating are separated out, and the self-snow melting function is realized. Secondly, salt particles are doped in the hot-mixing process of the asphalt mixture, the particle size of the salt particles is 0.075mm, the passing rate is generally over 75%, and the doping amount is generally 3% -8%; paving a self-snow-melting asphalt concrete layer with the thickness of 4cm on a newly-built pavement; and (3) paving a self-snow-melting asphalt concrete layer with the thickness of 3-4 cm on the old pavement after milling, wherein a salinization substance is wrapped by asphalt, water permeates into the self-snow-melting material layer from gaps of the asphalt pavement, and effective components are gradually separated out of the pavement surface under the actions of osmotic pressure, capillary force, wheel pumping and the like to play a role in snow melting and ice suppression.
In the first use mode, the snow melting coating needs special spraying equipment, the skid resistance of the coated pavement is generally reduced, the service life of the coating is only 2-3 months under high traffic, the beauty of the pavement is affected by residues, the coating needs to be repeatedly sprayed every year, the interference to traffic is large, and the construction cost is high; in the second use mode, the salinized substance particles are hot-mixed in the asphalt mixture, the pavement layer is thick, after the effective components of the salinized substance on the surface layer are separated out, along with the polishing and compaction of the surface layer, the salinized substance on the bottom layer of the pavement layer is slowly or hardly separated out, the later snow melting effect is not obvious, and the salinized substance particles are easily dissolved in water, and are rapidly lost and cannot be stored when being mixed into cold-mixed mixtures such as slurry seal layers, micro-surfacing parts and the like.
Therefore, for self-snow-melting salinized asphalt pavement, three key problems need to be solved: firstly, the composition of the self-snow-melting salinization material is designed and optimized, and secondly, the effective component precipitation path and slow release of the salinization material are realized; thirdly, the snow melting material needs to be environment-friendly, economical and convenient to construct.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a salinization particle for micro-surfacing of an asphalt pavement and a preparation method thereof, so as to realize the self-snow-melting function of the asphalt pavement. The invention is based on a graininess multistage enveloping model, the grain skeleton is formed by adopting organic cementing materials, the slow release material controls the precipitation rate of the effective components of the salinization material, the salinization material used for the micro-surfacing of the low-carbon and environment-friendly asphalt pavement is developed, the maintenance engineering of the asphalt pavement can be combined, the self snow melting function of the asphalt pavement can be realized, and the invention has important practical significance and engineering application value.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme.
The salinization product particles for the micro-surfacing of the asphalt pavement are characterized by comprising the following raw material components: salt powder, bisphenol A epoxy resin, polyamine curing agent, aromatic oil, polyolefin and layered silicate; the salinization powder consists of chloride, acetate and bromide.
Preferably, the raw material components comprise the following components in percentage by mass: 66 to 71 percent of salt powder, 7.8 to 9.1 percent of bisphenol A epoxy resin, 4.2 to 4.9 percent of polyamine curing agent, 6.3 to 8.4 percent of aromatic oil, 2.7 to 3.6 percent of polyolefin and 8 to 11 percent of layered silicate.
Preferably, the mass ratio of the chloride salt to the acetate salt to the bromide salt is 7: 2: 1. the chlorine salt in the salt powder comprises: magnesium chloride (MgCl)2)、Calcium chloride (CaCl)2) And sodium chloride (NaCl). Preferably, the magnesium chloride (MgCl)2) Calcium chloride (CaCl)2) And the mass ratio of calcium chloride (NaCl) is 1:1: 3. The acetate in the salt powder comprises: calcium Magnesium Acetate (CMA), calcium acetate (Ca (AC)2). Preferably, the Calcium Magnesium Acetate (CMA), calcium acetate (Ca (AC)2) The mass ratio is 1: 1. The bromine salts in the salt powder include: sodium bromide (NaBr), calcium bromide (CaBr)2). Preferably, the sodium bromide (NaBr), calcium bromide (CaBr)2) The mass ratio is 1: 1.
Preferably, the polyamine curing agent is diethylenetriamine, triethylenetetramine or divinylpropylamine.
Preferably, the mass ratio of the bisphenol A epoxy resin to the polyamine curing agent is 65: 35.
Preferably, the mass ratio of the aromatic oil to the polyolefin is 7: 3.
preferably, the phyllosilicate is montmorillonite, bentonite or mica.
Preferably, the polyolefin consists of low density polyethylene and polypropylene.
Preferably, the mass ratio of the low-density polyethylene to the polypropylene is 1: 1.
the preparation method of the salinization product particles for the micro-surfacing of the asphalt pavement is characterized by comprising the following steps:
(1) at the temperature of 90-120 ℃, the aromatic oil and the polyolefin are stirred and mixed evenly, and cooled to normal temperature to form a milky thick grease-like mixture A for later use.
(2) Stirring and uniformly mixing the bisphenol A type epoxy resin and the polyamine curing agent to obtain a mixture B, and keeping the temperature of the obtained mixture B at 48-52 ℃ for later use.
(3) Firstly, putting chloride salt, acetate and bromide salt into a mixing barrel for mixing, stirring for 3-5 min, then sequentially adding the mixture A, the mixture B and the layered silicate, stirring for 20-30 min until a uniform bulk plastic body is formed, and placing the bulk plastic body in a curing box at 60 ℃ for curing for 3-4 h.
(4) And (3) placing the cured bulk plastic body into a spiral granulator, extruding and cutting the bulk plastic body, and then placing the bulk plastic body into a curing box at 50 ℃ for curing for 4-6 hours to obtain the plastic material.
The salinization particle used for the micro-surfacing of the asphalt pavement has the following advantages and beneficial effects:
(1) in the invention, the salt particles are solid with the diameter of 2-3 mm and the length of 2-3 mm, the color is light yellow, and the density is 1.87-2.13g/cm3The melting point is more than or equal to 180 ℃.
(2) In the invention, bisphenol A type epoxy resin and polyamine curing agent construct the main skeleton of the salt particles, thereby ensuring the compressive strength and surface hardness of the salt particles.
(3) In the invention, the aromatic oil and the polyolefin are slow-release and low-temperature brittle fracture components and have hydrophobic characteristics, the mixture is in a grease state at high temperature and normal temperature, the surface layer of the particles is infiltrated or the gaps inside the particles are filled, good enveloping and slow-release effects are achieved, and the particles are gradually shrunk and cracked at the temperature of below 0 ℃ to form capillary gaps, so that the precipitation of effective components of salt compounds is facilitated, and the snow melting effect is realized.
(4) In the invention, the phyllosilicate has good plasticity and viscosity, the unit cells of the phyllosilicate are weakly connected and can slide between layers, and when the phyllosilicate is in a dilute solution interface state, ion exchange exists between the layers and the outside of the layers, so that the phyllosilicate shows hydrophilicity and has the function of inducing the precipitation of effective components of a salinized substance; when the interface state of the concentrated solution is in a state of interlayer and outer layer ion exchange, if water is soaked into particles, the surface is in a saturated state, and the loss of effective components of the salinized substance can be delayed by combining the hydrophobic effect and the surface tension of the slow-release and low-temperature phase change components.
Detailed Description
For a better understanding of the present invention, the following examples are given to further illustrate the present invention, but the present invention is not limited to the examples.
The method for preparing the micro-surfacing salinized substance particles of the asphalt pavement comprises the following steps:
step one, sequentially adding 15g of low-density polyethylene, 15g of polypropylene and 70g of aromatic oil into a 500ml glass, and uniformly stirring to obtain a mixture A; and placing the mixture A on a temperature-adjustable electric furnace, controlling the temperature to be between 90 and 120 ℃, and marking the mixture A as an original sample A for later use.
Step two, sequentially adding 65g of bisphenol A epoxy resin and 35g of polyamine curing agent into a 500ml glass cup, and uniformly stirring to obtain a mixture B; placing the mixture B on a temperature-adjustable electric furnace, controlling the temperature to be between 48 and 52 ℃, and marking the mixture B as the original sample B for standby.
Weighing 500g of salinization powder in total mass, wherein the salinization powder specifically comprises the following components, by mass, 210g of sodium chloride (NaCl) and 70g of calcium chloride (CaCl)2) 70g of magnesium chloride (MgCl)2) 50g of Calcium Magnesium Acetate (CMA), 50g of calcium acetate (Ca (AC))2) 25g of sodium bromide (NaBr) and 25g of calcium bromide (CaBr)2) And mixed well to give mixture C, designated as received C.
Step four, weighing 100g of the phyllosilicate, and marking the phyllosilicate as the original shape D.
Step five, setting the total mass as 100g according to different example proportions in the table 1, and respectively weighing required amounts from the original A, the original B, the original C and the original D in sequence.
Firstly, adding an original sample C (salt powder) into a stirring cylinder, mixing, stirring for 3-5 min, then sequentially adding an original sample A (aromatic oil and polyolefin), an original sample B (bisphenol A type epoxy resin and polyamine curing agent) and an original sample D (layered silicate), mixing and stirring for 20-30 min until uniform bulk plastomers are formed, and obtaining 4 bulk plastomers with different mass ratios.
TABLE 1 quality ratios of raw material components in different examples
Sixthly, respectively placing the 4 dough-shaped plastic bodies with different mass ratios in a curing box at 60 ℃ for curing, wherein the curing time is shown in table 2 in different embodiments.
TABLE 2 curing times for the different examples
| Examples | 1 | 2 | 3 | 4 |
| Maintenance period (h) | 3 | 3.5 | 3.5 | 4 |
Seventhly, placing the 4 cured bulk plastomers into a spiral granulator, extruding and cutting the 4 bulk plastomers, and then placing the bulk plastomers into a curing box at 50 ℃ for curing to obtain 4 different proportions of salinized substance particles for micro-surfacing of the asphalt pavement, wherein the proportions are as follows: the example 1 salinated particle for micro-surfacing of asphalt pavement, the example 2 salinated particle for micro-surfacing of asphalt pavement, the example 3 salinated particle for micro-surfacing of asphalt pavement, and the example 4 salinated particle for micro-surfacing of asphalt pavement, the curing time of different examples is shown in table 3.
TABLE 3 health maintenance time for various examples
| Examples | 1 | 2 | 3 | 4 |
| Maintenance period (h) | 4 | 4.5 | 5.5 | 6 |
Firstly, preparing a common micro-surfacing emulsified asphalt mixture; and then, the example 1 salinized substance particles used for micro-surfacing of the asphalt pavement, the example 2 salinized substance particles used for micro-surfacing of the asphalt pavement, the example 3 salinized substance particles used for micro-surfacing of the asphalt pavement and the example 4 salinized substance particles used for micro-surfacing of the asphalt pavement are utilized to respectively prepare the corresponding example 1 micro-surfacing emulsified asphalt mixture, the example 2 micro-surfacing emulsified asphalt mixture, the example 3 micro-surfacing emulsified asphalt mixture and the example 4 micro-surfacing emulsified asphalt mixture, wherein the mixing amount of the salinized substance particles in the 4 micro-surfacing emulsified asphalt mixtures is the same.
The method comprises the following specific steps:
firstly, preparing a micro-surfacing emulsified asphalt mixture raw material according to the technical requirement of MS-3 type micro-surfacing in technical Specification JTG F40-2004 for road asphalt pavement construction.
1) The common micro-surfacing emulsified asphalt mixture comprises the following components in percentage by mass: coarse aggregate (5-10 mm): fine aggregate (3-5 mm): fine aggregate (0-3 mm): mineral powder: cement: water: emulsified asphalt 18: 12: 50: 5.5: 2.5: 5.5: 6.5.
2) example 1 the mass ratio of the emulsified asphalt mixture at the micro-surface of the salinized substance particles is as follows: coarse aggregate (5-10 mm): fine aggregate (3-5 mm): example 1 salt particles: fine aggregate (0-3 mm): mineral powder: cement: water: emulsified asphalt 18: 10: 5: 47: 5.5: 2.5: 5.5: 6.5. example 2 the mass ratio of the emulsified asphalt mixture at the micro-surface of the salinized substance particles is as follows: coarse aggregate (5-10 mm): fine aggregate (3-5 mm): example 2 salt particles: fine aggregate (0-3 mm): mineral powder: cement: water: emulsified asphalt 18: 10: 5: 47: 5.5: 2.5: 5.5: 6.5. example 3 the mass ratio of the emulsified asphalt mixture at the micro-surface of the salinized substance particles is as follows: coarse aggregate (5-10 mm): fine aggregate (3-5 mm): example 3 salt particles: fine aggregate (0-3 mm): mineral powder: cement: water: emulsified asphalt 18: 10: 5: 47: 5.5: 2.5: 5.5: 6.5. example 4 the mass ratio of the emulsified asphalt mixture at the micro-surface of the salinized substance particles is as follows: coarse aggregate (5-10 mm): fine aggregate (3-5 mm): example 4 salt particles: fine aggregate (0-3 mm): mineral powder: cement: water: emulsified asphalt 18: 10: 5: 47: 5.5: 2.5: 5.5: 6.5.
and step two, forming a load wheel rolling test piece and a wet wheel abrasion test piece according to road engineering asphalt and asphalt mixture test specification JTG E20-2011, performing the wet wheel abrasion test, the load wheel rolling test and the snow melting performance test respectively by adopting the load wheel rolling test piece, and obtaining test results shown in table 4.
TABLE 4 micro-surfacing emulsified asphalt mixture performance test results of different examples
The data in table 4 show that 5 micro-surfacing emulsified asphalt mixtures can meet the standard requirements, and after the salinized particles are doped, the variation of the adhered sand amount of the emulsified asphalt mixture in a load wheel rolling test, the deformation rate of the width of a wheel track deformation test and the abrasion value of a wet wheel abrasion test is not large; along with the increase of the doping amount of the salinized substance powder material, the conductivity of the solution at low temperature is increased; along with the increase of the mixing amount of bisphenol A type epoxy resin and polyamine curing agent, the solution conductivity at low temperature is reduced, the adhering sand amount of a load wheel rolling test, the width deformation rate of a wheel track deformation test and the abrasion value of a wet wheel abrasion test are reduced, but the requirements of technical specification JTG F40-2004 of highway asphalt pavement construction can be met, and the self-snow-melting function of the asphalt pavement can be well realized.
Although embodiments of the invention have been described above with reference to examples, the patent is not limited to the specific embodiments and applications described above, which are intended to be illustrative, instructive and not limiting. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the claims and their equivalents.
Claims (6)
1. The salinization product particles for the micro-surfacing of the asphalt pavement are characterized by comprising the following raw material components: salt powder, bisphenol A epoxy resin, polyamine curing agent, aromatic oil, polyolefin and layered silicate; the salinization powder consists of chloride, acetate and bromide; the polyamine curing agent is diethylenetriamine, triethylene tetramine or divinyl propylamine; the phyllosilicate is montmorillonite, bentonite or mica;
the raw material components by mass percent are as follows: 66 to 71 percent of salt powder, 7.8 to 9.1 percent of bisphenol A epoxy resin, 4.2 to 4.9 percent of polyamine curing agent, 6.3 to 8.4 percent of aromatic oil, 2.7 to 3.6 percent of polyolefin and 8 to 11 percent of layered silicate;
wherein the mass ratio of the bisphenol A epoxy resin to the polyamine curing agent is 65: 35; the mass ratio of the aromatic oil to the polyolefin is 7: 3.
2. the salinized substance particle for micro-surfacing of asphalt pavement according to claim 1, wherein the salinized substance powder comprises chloride, acetate and bromide in a mass ratio of 7: 2: 1.
3. the salinate particle for micro-surfacing of asphalt pavements of claim 1, wherein the chloride salt in the salinate powder comprises: magnesium chloride, calcium chloride and sodium chloride; wherein the mass ratio of the magnesium chloride to the calcium chloride is 1:1: 3.
4. The salinated particle for micro-surfacing of asphalt pavement according to claim 1, wherein acetate in the salinated powder comprises: calcium magnesium acetate and calcium acetate; wherein the mass ratio of the calcium magnesium acetate to the calcium acetate is 1: 1.
5. The salinate particle for micro-surfacing of asphalt pavements of claim 1, wherein the bromine salt in the salinate powder comprises: sodium bromide and calcium bromide; wherein the mass ratio of the sodium bromide to the calcium bromide is 1: 1.
6. The method for preparing the salinized substance particles for the micro-surfacing of asphalt pavements as claimed in claim 1, comprising the steps of:
(1) at the temperature of 90-120 ℃, uniformly stirring and mixing aromatic oil and polyolefin, and cooling to normal temperature to form a milky thick grease-like mixture A for later use; wherein the mass ratio of the aromatic oil to the polyolefin is 7: 3;
(2) uniformly stirring and mixing bisphenol A type epoxy resin and a polyamine curing agent to obtain a mixture B, and keeping the temperature of the obtained mixture B at 48-52 ℃ for later use; wherein the mass ratio of the bisphenol A epoxy resin to the polyamine curing agent is 65: 35;
(3) firstly, putting chloride salt, acetate and bromide salt into a mixing barrel, mixing, stirring for 3-5 min, then sequentially adding the mixture A, the mixture B and the layered silicate, stirring for 20-30 min until a uniform bulk plastic body is formed, placing the bulk plastic body in a curing box at 60 ℃, and curing for 3-4 h; the phyllosilicate is montmorillonite, bentonite or mica;
(4) and (3) placing the cured bulk plastic body into a spiral granulator, extruding and cutting the bulk plastic body, and then placing the bulk plastic body into a curing box at 50 ℃ for curing for 4-6 hours to obtain the plastic material.
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| CN103058546A (en) * | 2012-12-26 | 2013-04-24 | 上海浦东路桥建设股份有限公司 | Snow melting bituminous mixture modifier and preparation method thereof |
| CN103073897A (en) * | 2012-12-26 | 2013-05-01 | 上海浦东路桥建设股份有限公司 | Environment-friendly and stable asphalt mixture modifier for melting snow and preparation method thereof |
| CN104327341A (en) * | 2014-11-25 | 2015-02-04 | 江苏省交通科学研究院股份有限公司 | Sustained-release type elastic de-icing additive as well as preparation method and application thereof |
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| CN103058546A (en) * | 2012-12-26 | 2013-04-24 | 上海浦东路桥建设股份有限公司 | Snow melting bituminous mixture modifier and preparation method thereof |
| CN103073897A (en) * | 2012-12-26 | 2013-05-01 | 上海浦东路桥建设股份有限公司 | Environment-friendly and stable asphalt mixture modifier for melting snow and preparation method thereof |
| CN104327341A (en) * | 2014-11-25 | 2015-02-04 | 江苏省交通科学研究院股份有限公司 | Sustained-release type elastic de-icing additive as well as preparation method and application thereof |
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