CN101806028A - Layered steel fiber conductive bituminous concrete - Google Patents
Layered steel fiber conductive bituminous concrete Download PDFInfo
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- CN101806028A CN101806028A CN 201010126896 CN201010126896A CN101806028A CN 101806028 A CN101806028 A CN 101806028A CN 201010126896 CN201010126896 CN 201010126896 CN 201010126896 A CN201010126896 A CN 201010126896A CN 101806028 A CN101806028 A CN 101806028A
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Abstract
The invention relates to a steel fiber bituminous concrete, in particular to a layered steel fiber conductive bituminous concrete. The layered steel fiber conductive bituminous concrete is characterized by comprising a bituminous concrete pavement, a steel fiber layer and a lower bearing layer which are sequentially arranged from top to bottom, wherein electrodes are embedded in the steel fiber layer; the steel fiber layer consists of steel fiber and conductive emulsified asphalt and is uniformly paved on the surface of the lower bearing layer with a spreading method, the conductive emulsified asphalt is sprayed on the steel fiber, the spreading amount of the steel fiber is 170-330g/m<2>, and the spraying amount of the emulsified asphalt is 0.6-0.81g/m<2>. The invention has the characteristics of low cost of construction, simple and convenient construction, easy control of quality and favorable conductive performance, and meanwhile, the high-temperature stability and the low-temperature crack resistance are improved. The layered steel fiber conductive bituminous concrete is applied to deicing and snow melting of bituminous pavements and self-healing or heat repairing of the diseases of bituminous pavements.
Description
Technical field
The present invention relates to a kind of steel fibre bituminous concrete, particularly relate to a kind of layered steel fiber conductive bituminous concrete.
Background technology
The pavement performance and the safety problem of asphalt concrete pavement are paid close attention to by people always.Asphalt concrete pavement has advantages such as oil consumption is low, noise is little, skid resistance is good, vehicle abrasion is little for driving, is used widely in major road such as airfield runway, deck paving, speedway, road, city face at present.Built in the highway in countries in the world, flexible pavement has accounted for more than 80%; It in China's speedway flexible pavement.But pitch is a kind of typical viscoelastic materials, and low temperature easily becomes fragile, the high temperature trickling of easily being clamminess.Therefore, during summer high temperature, the flexible pavement temperature can reach 70 ℃, very easily occurs phenomenons such as rut, wave passing under the car load effect; During winter low temperature, especially in northern China, pavement temperature reaches-30 ℃, and warm draw seam can appear again in flexible pavement, has had a strong impact on pavement quality, durability and application life; On the other hand, the accumulated snow freezing weather that low temperature causes produces challenge greatly to traffic safety, and the current of sealing restriction road will have influence on the contribution of traffic to economic construction.Therefore, the deicing or snow melting of the height warm disease on road surface evil and environmental protection is a problem demanding prompt solution in the flexible pavement application process.
At present, countries in the world are mainly by salting (NaCl, CaCl
2) come deicing or snow melting.This method is to utilize salt to reduce the freezing point of water, and accumulated snow is melted automatically.This method have material source extensively, characteristics such as low price, change ice and snow be effective, thereby obtained widespread usage.But, remove the salt method and brought many negative effects also for concrete road surface structure and environment, mainly show as reinforced steel fibre corrosion, road surface and degrade and destroy and problem such as environment pollution.In recent years, carried out both at home and abroad and utilize conducting concrete to carry out a series of researchs of deicing or snow melting.Conducting concrete is the conductive phase filler that mixes suitable type and suitable content in concrete, makes concrete have the electrical property up to specification and the special concrete of certain mechanical property.Wherein the main performance index of conductive asphalt concrete comprises pavement performance and electrical conductivity or resistivity etc.
Current, the conductive phase that is usually used in making conductive asphalt concrete can be divided three classes substantially: polymer class, carbon charcoal class and metal species; Wherein, the most frequently used is the steel fibre of carbon class such as graphite powder, carbon black, carbon fiber and metal species and metallurgical slag etc.Steel fibre is generally prepared conducting concrete with the form of directly mixing.Mixing of steel fibre not only gives bituminous concrete certain electric conductivity, but also can improve some pavement performance of bituminous concrete etc.Adding under interchange or the dc source effect, conductive asphalt concrete can produce heat because of the resistance of himself, and pavement temperature is raise.When pavement temperature rose to more than 0 ℃, the ice on the road surface, snow will absorb heat and be melted into water and flow away.But, restricted the development on steel fibre coagulation road surface to a certain extent because its cost is higher.
Summary of the invention
Technical problem to be solved by this invention is: the layered steel fiber conductive bituminous concrete that a kind of cost is low, electric conductivity is good is provided.
The present invention solves its technical problem and adopts following technical scheme: layered steel fiber conductive bituminous concrete, it is characterized in that: it comprises asphalt concrete pavement 1, steel fibre layer 4, sub-layer 2, asphalt concrete pavement 1, steel fibre layer 4, sub-layer 2 are arranged from top to bottom successively, be embedded with electrode 3 (electrode utilizes electrocaloric effect in deicing snow melting cold season with after external power source is connected) in the steel fibre layer; The steel fibre layer is made up of steel fibre and conduction mulseal, steel fibre adopts the method for spreading evenly to be laid on the sub-layer surface, spray on the steel fibre and the conduction mulseal is arranged (behind the spreading steel fibre, needing to spray the conduction mulseal makes both form inierpeneirating network structure), the spreading amount of steel fibre is 170～330g/m
2, the cloth amount of spilling of conduction mulseal is 0.6～0.8L/m
2
The diameter of described steel fibre is 60～200 μ m, draw ratio 70～310.
Described conduction mulseal is composited by mulseal and graphite powder, the incorporation of graphite powder be behind the mulseal heating evaporation residual asphalt weight 10%～25%.Mulseal is common emulsified asphalt or modified emulsifying asphalt.
The material of described sub-layer is bituminous concrete or cement concrete.The thickness of asphalt concrete pavement 1 is 2.5cm～12cm; The thickness of sub-layer 2 is 5cm～60cm.
The preparation method of above-mentioned layered steel fiber conductive bituminous concrete, it comprises the steps:
1) build up sub-layer 2 with bituminous concrete or cement concrete on the roadbed upper berth, the thickness of sub-layer 2 is 5cm～60cm, can construct several times;
2) steel fibre is adopted the method for spreading evenly be laid on the sub-layer surface, installing electrodes on the steel fibre layer; On steel fibre and electrode, spray the conduction mulseal then, form steel fibre layer 4; Wherein, the spreading amount of steel fibre is 170～330g/m
2, the cloth amount of spilling of conduction mulseal is 0.6～0.8L/m
2
3) treat the mulseal breakdown of emulsion after, making asphalt concrete pavement, the thickness 2.5cm～12cm of asphalt concrete pavement 1.
Layered steel fiber conductive bituminous concrete provided by the invention, it is used for the snow-removing and ice-thawing of asphalt concrete pavement and the self-healing or the hot repair of Asphalt Pavement Damage answered.
Electrical conduction mechanism of the present invention is: the conductive asphalt based composites exists electricity to lead the seepage flow phenomenon.Carry out compound tense at conductive component material (conductive phase) with insulating body material (matrix mutually), when the volume content of conductive phase during less than a certain threshold, the resistivity of composite material slowly reduces with the increase of conductive phase volume content; When the volume content of conductive phase reached threshold, the resistivity of composite material sharply reduced, and the reducing of resistivity reaches several even ten more than the order of magnitude; After the volume content of conductive material surpasses threshold, with the further increase of volume, the reducing and tend towards stability of composite material resistance rate.The critical size content of conductive material is called the diafiltration threshold values.The present invention is the steel fibre layer that one deck conduction is set between asphalt concrete pavement and sub-layer, overlaps mutually between the steel fibre and forms conductive path; Volume content of steel fibers crosses that I haven't seen you for ages influences electric conductivity, and volume too much can influence the adhesive property between asphalt surface course; It is relevant whether steel fibre forms the spreading amount of draw ratio, unit area of conductive path and fiber; The present invention takes into full account various factors, and the diameter that limits fiber is 60～200 μ m, and draw ratio 70～310, spreading amount are 170～330g/m
2, make not conglomeration in the fiber spreading process, be evenly distributed; Spray the conduction mulseal simultaneously steel fibre is stabilized on the sub-layer, and form interpenetrating networks with steel fibre; The mulseal that uses is through the modification of graphite composite conducting, and graphite forms conductive path in mulseal; Mulseal can form asphalt membrane at steel fiber surface, and the protection steel fibre is not oxidized; Mulseal also plays the effect of tack coat simultaneously, prevents the passing of bituminous concrete.
The snow-removing and ice-thawing that utilizes conducting concrete to carry out road has been verified as effective way, and the volume of the inner steel fibre of conducting concrete is generally 3%～6% of weight concrete.The present invention is by being provided with one deck steel fibre layer in bituminous concrete inside, the spreading amount of steel fibre only was the latter's about 10% when its conductance reached the same resistivity value of common conductive asphalt concrete.It is that a (diameter 12 μ m) and draw ratio are steel fibre spreading amount and the relation between the bituminous concrete surface resistivity (spraying the conduction mulseal) of two kinds of b (diameter 86.7 μ m) that Fig. 2 has provided the draw ratio that experimental measurement draws.The result shows that the steel fibre that identical spreading amount adopts is thin more, and its resistivity is more little.This be because, steel fibre is thin more, mutually the probability of overlap joint is high more between the unit volume fiber, its diafiltration threshold values is low more.Studies show that: the steel fibre of 1～60 μ m can manually disperse and spreading under the controlled condition of laboratory, if on actual road surface, no matter the extensive spreading of artificial still machinery all is to be difficult to realize.
At the inner blending steel fibre of cement concrete, because the development of fiber retardance matrix distress in concrete, thereby its mechanical property etc. is significantly improved than ordinary concrete.Studies show that: the intensity of bituminous concrete mainly relies on the bonding of pitch, but the adhesiveness of pitch and steel fibre is very poor; Directly mix steel fibre in bituminous concrete inside, fiber also can block the development in matrix crack, and the result causes the water stability of bituminous concrete, the variation of crack resistance at low-temperature to have uncertainty.The steel fibre layer that is provided with in the asphalt surface course bottom, can utilize the development of fiber retardance matrix distress in concrete with the integral body that sub-layer constitutes, thereby tension, bending resistance, shear strength of making the road surface etc. increase than ordinary concrete, its shock resistance, antifatigue, split back toughness and durability bigger improvement is also arranged, but these need be prerequisite to sacrifice adhesion stress between asphalt surface course and the sub-layer all.Shear strength between the surface layer when Fig. 3 has provided 25 ℃ under the different spreading amount of 50 μ m steel fibres.In the experimental study process, steel fibre greater than 200 μ m, adopt suitable major diameter when spreading amount still can reach the electric conductivity that can be used for deicing or snow melting, will cause the adhesiveness between asphalt surface course and the sub-layer to reduce but the spreading amount of the unit area of steel fibre is excessive, and improve cost.The diameter that limits steel fibre based on the factor of above each side is 60～200 μ m, and draw ratio 70～310, spreading amount are 170～330g/m
2, the requirement that can satisfy electric property is convenient to again construct and minimum degree reduces the negative effect that the steel fibre layer brings.
The invention has the beneficial effects as follows:
1. one deck steel fibre layer is established at the end of asphalt concrete pavement, and the top layer still is plain bituminous concrete.Its mechanical property is close with existing steel fibre bituminous concrete, and the steel fibre consumption has only about 10% of steel fibre bituminous concrete, has obviously reduced cost.
2. use less conductive phase filler just can obtain identical electrical conductivity (with respect to conductive asphalt concrete, layered steel fiber is concentrated, its electrical conductivity height): the conductive phase filler that adds in the existing conductive asphalt concrete is owing to gather materials and amount that the obstruct of pitch causes strengthening the conductive phase filler could form conductive path.Layered steel fiber is controlled in the spreading process, and conductive path is stablized and formed inierpeneirating network structure with the conduction mulseal, and electrical conductivity is greatly improved.
3. improve traffic safety, cold snap can carry out road surface ice snow removing, the traffic safety hidden danger of having avoided ice and snow to cause.
4. increase the stability and the durability on road surface, avoid the thermal field acute variation of flexible pavement when microthermal climate, significantly reduced the generation in low temperature crack, the heat that can utilize the layered steel fiber layer to produce simultaneously carries out the reparation of diseases such as asphalt pavement rut, crack, thereby prolong the application life on road surface, reduced the road maintenance cost indirectly.
5. easy construction, quality are easy to control, and high-temperature stability and low-temperature cracking-resistance are improved simultaneously.
Description of drawings
Fig. 1 is the structural representation on layered steel fiber conductive bituminous concrete provided by the invention road surface.
Fig. 2 is the graph of a relation of steel fibre spreading amount and bituminous concrete surface resistivity.
Shear strength figure between the surface layer when Fig. 3 is 25 ℃ under the different spreading amount of 50 μ m steel fibres.
Fig. 4 is time and a test block surface temperature graph of a relation in the deicing processes.
The specific embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but do not limit the present invention.
Embodiment 1:
As shown in Figure 1, layered steel fiber conductive bituminous concrete, it comprises asphalt concrete pavement 1, steel fibre layer 4, sub-layer 2, asphalt concrete pavement 1, steel fibre layer 4, sub-layer 2 are arranged (sub-layer 2, steel fibre layer 4, asphalt concrete pavement 1 are arranged successively) from top to bottom successively from bottom to top, and (the long stainless steel electrode of 300mm, wide 10mm that is be arranged in parallel to be embedded with electrode 3 in the steel fibre layer; Electrode utilizes electrocaloric effect in deicing snow melting cold season with after external power source is connected); The steel fibre layer is made up of steel fibre and conduction mulseal, steel fibre adopts the method for spreading evenly to be laid on the sub-layer surface, spraying on the steel fibre has the conduction mulseal (behind the spreading steel fibre, spray the conduction mulseal and make both form inierpeneirating network structure), and the spreading amount of steel fibre is 315g/m
2, the cloth amount of spilling of conduction mulseal is 0.65L/m
2
The diameter of described steel fibre is 86.7 μ m, draw ratio 72～110 (fibre length differs).Described conduction mulseal is composited by mulseal and graphite powder, the incorporation of graphite powder be behind the mulseal heating evaporation residual asphalt weight 18%.Mulseal is a common emulsified asphalt.The material of described sub-layer is a bituminous concrete.The length of asphalt concrete pavement 1 * wide * height (being thickness)=300mm * 300mm * 50mm; The length of sub-layer 2 * wide * height=300mm * 300mm * 50mm.
The surface resistivity that the result records the layered steel fiber conductive bituminous concrete of present embodiment 1 is 12.6 Ω, and shear strength is 0.102MPa.Carry out dynamic stability test according to " highway engineering pitch and bituminous mixture testing regulation " and find that the rut degree of depth has reduced 0.36mm; Carry out low temperature (10 ℃) crooked test, obtain its destruction bending stifiness modulus and improved 1233MPa.Its mechanical property is close with existing steel fibre bituminous concrete, and the steel fibre consumption has only 10% of steel fibre bituminous concrete.
Slough behind the mould on the layered steel fiber conductive bituminous coagulation with present embodiment 1 (rut plate) and put into low-temperature test chamber, the temperature inside the box remains on-10 ℃, and constant temperature sprinkles 2kg trash ice constant temperature 6 hours again after 24 hours in this casing.Then the electrode two ends are connected 72V voltage, time and test block surface temperature relation is as Fig. 4 in the deicing processes, the test block surface temperature is along with the time increases gradually, in the time of 0～0.8 ℃, continue to occur the phase transition process of ice-out Cheng Shui, temperature constant rises after a period of time once more, finishes in two hours in the whole deicing processes.
Embodiment 2:
As shown in Figure 1, layered steel fiber conductive bituminous concrete, it comprises asphalt concrete pavement 1, steel fibre layer 4, sub-layer 2, asphalt concrete pavement 1, steel fibre layer 4, sub-layer 2 are arranged from top to bottom successively, be embedded with electrode 3 (electrode utilizes electrocaloric effect in deicing snow melting cold season with after external power source is connected) in the steel fibre layer; The steel fibre layer is made up of steel fibre and conduction mulseal, steel fibre adopts the method for spreading evenly to be laid on the sub-layer surface, spraying on the steel fibre has the conduction mulseal (behind the spreading steel fibre, spray the conduction mulseal and make both form inierpeneirating network structure), and the spreading amount of steel fibre is 170g/m
2, the cloth amount of spilling of conduction mulseal is 0.6L/m
2
The diameter of described steel fibre is 60 μ m, draw ratio 70.
Described conduction mulseal is composited by mulseal and graphite powder, the incorporation of graphite powder be behind the mulseal heating evaporation residual asphalt weight 10%.Mulseal is a common emulsified asphalt.
The material of described sub-layer is a bituminous concrete.The thickness of asphalt concrete pavement 1 is 50mm (asphalt concrete pavement adopts existing material); The thickness of sub-layer 2 is 50mm.
The preparation method of above-mentioned layered steel fiber conductive bituminous concrete, it comprises the steps:
1) build up sub-layer 2 with bituminous concrete on the roadbed upper berth, the thickness of sub-layer 2 is 50mm;
2) steel fibre is adopted the method for spreading evenly be laid on the sub-layer surface, installing electrodes on the steel fibre layer; On steel fibre and electrode, spray the conduction mulseal then, form steel fibre layer 4; Wherein, the spreading amount of steel fibre is 170g/m
2, the cloth amount of spilling of conduction mulseal is 0.6L/m
2
3) treat the mulseal breakdown of emulsion after, making asphalt concrete pavement, the thickness of asphalt concrete pavement 1 are 50mm.
The surface resistivity that the result records the layered steel fiber conductive bituminous concrete of present embodiment 2 is 26.5 Ω, and shear strength is 0.193MPa.Carry out dynamic stability test according to " highway engineering pitch and bituminous mixture testing regulation " and find that the rut degree of depth has reduced 0.13mm; Carry out low temperature (10 ℃) crooked test, obtain its destruction bending stifiness modulus and improved 810MPa.Its mechanical property is close with existing steel fibre bituminous concrete, and the steel fibre consumption has only 9.6% of steel fibre bituminous concrete.
Layered steel fiber conductive bituminous concrete provided by the invention, it is used for the snow-removing and ice-thawing of asphalt concrete pavement and the self-healing or the hot repair of Asphalt Pavement Damage answered.
Embodiment 3:
As shown in Figure 1, layered steel fiber conductive bituminous concrete, it comprises asphalt concrete pavement 1, steel fibre layer 4, sub-layer 2, asphalt concrete pavement 1, steel fibre layer 4, sub-layer 2 are arranged from top to bottom successively, be embedded with electrode 3 (electrode utilizes electrocaloric effect in deicing snow melting cold season with after external power source is connected) in the steel fibre layer; The steel fibre layer is made up of steel fibre and conduction mulseal, steel fibre adopts the method for spreading evenly to be laid on the sub-layer surface, spray on the steel fibre and the conduction mulseal is arranged (behind the spreading steel fibre, spraying the conduction mulseal immediately makes both form inierpeneirating network structure), the spreading amount of steel fibre is 330g/m
2, the cloth amount of spilling of conduction mulseal is 0.8L/m
2
The diameter of described steel fibre is 200 μ m, draw ratio 310.
Described conduction mulseal is composited by mulseal and graphite powder, the incorporation of graphite powder be behind the mulseal heating evaporation residual asphalt weight 25%.Mulseal is a modified emulsifying asphalt.
The material of described sub-layer is a cement concrete.The thickness of asphalt concrete pavement 1 is 50mm (asphalt concrete pavement adopts existing material); The thickness of sub-layer 2 is 50mm.
The preparation method of above-mentioned layered steel fiber conductive bituminous concrete, it comprises the steps:
1) build up sub-layer 2 with cement concrete on the roadbed upper berth, the thickness of sub-layer 2 is 50mm;
2) steel fibre is adopted the method for spreading evenly be laid on the sub-layer surface, installing electrodes on the steel fibre layer; On steel fibre and electrode, spray the conduction mulseal then, form steel fibre layer 4; Wherein, the spreading amount of steel fibre is 330g/m
2, the cloth amount of spilling of conduction mulseal is 0.8L/m
2
3) treat the mulseal breakdown of emulsion after, making asphalt concrete pavement, the thickness of asphalt concrete pavement 1 are 50mm.
The surface resistivity that the result records the layered steel fiber conductive bituminous concrete of present embodiment 3 is 453 Ω, and shear strength is 0.033MPa.Carry out dynamic stability test according to " highway engineering pitch and bituminous mixture testing regulation " and find that the rut degree of depth has reduced 0.07mm; Carry out low temperature (10 ℃) crooked test, obtain its destruction bending stifiness modulus and improved 358MPa.Near the acceptable minimum value of bituminous concrete mechanical property, the steel fibre consumption also has only 12.3% of steel fibre bituminous concrete to its mechanical property.
Layered steel fiber conductive bituminous concrete provided by the invention, it is used for the snow-removing and ice-thawing of asphalt concrete pavement and the self-healing or the hot repair of Asphalt Pavement Damage answered.
Experiment Comparative Examples 1:
The moulding of combined type rut is carried out in the gradation composition of surface layer (being sub-layer) under superpave12.5 bituminous concrete upper layer (being asphalt concrete pavement) that the design compliant requires and the superpave19 bituminous concrete.At first with the rut plate (being sub-layer) of superpave19 proportioning moulding length * wide * height=300mm * 300mm * 50mm, after cooling with the artificial evenly spreading steel fibre (diameter of described steel fibre is 86.7 μ m, draw ratio 72～110) of sieve; Increase mould once more and carry out the moulding (being superpave12.5 bituminous concrete upper layer) of rut plate for the second time.After the cooling, the cube that cuts into the length and width height and all be 100mm carries out resistance test.Change different spreading amount, can obtain the influence (as Fig. 3) of relation (as Fig. 2) that surface resistivity changes with spreading amount and layered steel fiber the concrete anti-shear ability of layers of asphalt.The steel fibre of 86.7 μ m as shown in Figure 2, its spreading amount is 254g/m
2The time surface resistivity be 27.2 Ω, satisfy the power requirement of deicing or snow melting 300W by calculating.
Experiment Comparative Examples 2:
The superpave19 proportioning generates surface layer (being sub-layer) down, and (spreading amount is 315g/m to spreading 86.7 μ m steel fibres
2) back rapidly sprays the SBS modified emulsifying asphalt of graphite compound (spilling the cloth amount is 0.65L/m
2The incorporation of graphite is the 18%wt of residual asphalt amount behind the mulseal heating evaporation in the mulseal), treat to be expert at by superpave12.5 proportioning moulding upper layer (being asphalt concrete pavement) behind the mulseal breakdown of emulsion.
The result records 15.4 Ω that surface resistivity never sprays mulseal and reduces to 12.6 Ω, and the 0.042MPa that shear strength is never sprayed mulseal (experiment Comparative Examples 1) brings up to 0.102MPa.
Claims (3)
1. layered steel fiber conductive bituminous concrete, it is characterized in that: it comprises asphalt concrete pavement, steel fibre layer, sub-layer, asphalt concrete pavement, steel fibre layer, sub-layer are arranged successively from top to bottom, are embedded with electrode in the steel fibre layer; The steel fibre layer is made up of steel fibre and conduction mulseal, and steel fibre adopts the method for spreading evenly to be laid on the sub-layer surface, and conduction mulseal, the spreading amount of steel fibre are arranged is 170～330g/m in sprinkling on the steel fibre
2, the cloth amount of spilling of conduction mulseal is 0.6～0.8L/m
2
2. layered steel fiber conductive bituminous concrete according to claim 1 is characterized in that: the diameter of described steel fibre is 60～200 μ m, draw ratio 70～310.
3. layered steel fiber conductive bituminous concrete according to claim 1, it is characterized in that: described conduction mulseal is composited by mulseal and graphite powder, the incorporation of graphite powder be behind the mulseal heating evaporation residual asphalt weight 10%～25%.
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