CN101148856B - Asphalt macadam stress absorption layer and construction method thereof - Google Patents

Asphalt macadam stress absorption layer and construction method thereof Download PDF

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Publication number
CN101148856B
CN101148856B CN200710019042XA CN200710019042A CN101148856B CN 101148856 B CN101148856 B CN 101148856B CN 200710019042X A CN200710019042X A CN 200710019042XA CN 200710019042 A CN200710019042 A CN 200710019042A CN 101148856 B CN101148856 B CN 101148856B
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China
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asphalt
layer
stress absorption
mulseal
macadam
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CN200710019042XA
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Chinese (zh)
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CN101148856A (en
Inventor
徐培华
蔡乾东
徐玮
杨子刚
周振支
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徐培华
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Publication of CN101148856B publication Critical patent/CN101148856B/en

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Abstract

The present invention relates to asphalt road engineering, and is especially one stress absorbing asphalt macadam layer and its construction process. The stress absorbing asphalt macadam layer can absorb and reduce the stress of asphalt road surface or composite road surface and weaken the transmission of cracks to the surface asphalt layer. It consists of one macadam layer, one stress absorbing and binding layer and one connecting layer from top to bottom. Its construction process includes the steps of spreading connecting layer material onto the base layer, spreading the stress absorbing and binding layer and spreading the macadam layer. The stress absorbing and binding layer has material of polymer modified emulsified asphalt, high viscosity emulsified asphalt, hot SBS modified asphalt or rubber modified asphalt; and the connecting layer has material of kerosene diluted asphalt, high permeability emulsified asphalt, concrete interface adhesive, polymer modified emulsified asphalt or hot modified asphalt.

Description

Asphalt macadam stress absorption layer and job practices thereof
Technical field
The present invention relates to flexible pavement engineering field, particularly a kind of asphalt macadam stress absorption layer structure and job practices thereof.Be applicable to the inter-laminar stress that absorbs and subdue semi-rigid type base asphalt surface course or composite pavement, play effects such as waterproof, bonding and protection sub-layer simultaneously.
Background technology
At present, high-grade highway flexible pavement basic unit and the subbase of China more than 90% adopts semi-rigid hydraulic material, as with semi-rigid type bases such as stabilization gravels such as cement, lime, flyash, gravels, become the major structural types of China Higher level asphalt highway, and obtained applying widely.
Along with the continuous development of transport need, in a large amount of engineering practices, find that semi-rigid type base also exists some shortcomings.Because it is relatively more responsive that semi-rigid material changes temperature and humidity, swell-shrink coefficient is big, in its intensity forming process and during the operation, is easy to produce shrinkage crack and low temperature shrinkage crack.Under road traffic load stress and temperature changing stress act on repeatedly, tensile stress between semi-rigid type base and bitumen layer, shear stress present the variation development of various complexity, impel this shrinkage crack and the shrinkage crack of semi-rigid type base will continue expansion, and then reflex to asphalt surface course formation reflection crack.It is attractive in appearance not only to influence the road surface, and has destroyed the globality and the continuity of road structure, and causes the weakening (increasing modulus of resilience reduction etc. as place, crack flexure) of structural strength to a certain extent; Simultaneously, along with the immersion of rainwater or snow-broth, make to produce the semi-rigid type base deliquescing inside and wash away and the mud pumping phenomenon, thereby the destruction on aggravation road surface is shortened the application life on road surface.
Compare with semi-rigid asphalt pavement, cement concrete pavement belongs to typical rigid pavement structure, because many seams need be established in the rigid pavement, these seams have not only influenced road-ability, and cause bigger noise, and seam is again the weak spot of road structure simultaneously, if deal with improperly, under vehicular load and climatic influences, multiple diseases such as disconnected plate, cracking, purt mud, differential settlement, pitted skin, hole groove occur, thereby greatly reduce the functional performance on road surface.For improving this defective of cement concrete pavement, a kind of in recent years novel road surface structure---composite pavement (promptly overlaying bitumen layer on cement concrete pavement) is used widely.But after cement concrete pavement overlays bitumen layer, in the pitch overlay stress concentration phenomenon appears because near the displacement of cement concrete slab seam crossing causes above the seam, cement concrete slab rigid material self is strong to temperature and humidity variation sensitiveness in addition, drive the pitch overlay during its contraction or expansion and corresponding shrinkage strain occurs, this inter-laminar stress causes pavement cracking after reflexing to asphalt mixture surfacing, under the effect repeatedly of carload and temperature, water enters behind the crack and then the aggravation pavement destruction, has a strong impact on the functional performance and the application life of road structure.
Summary of the invention
Problem to be solved by this invention provides a kind of asphalt macadam stress absorption layer and job practices thereof, this stress absorbing layer is arranged on semi-rigid asphalt pavement interlayer junction or composite pavement interlayer junction, can absorb and subdue inter-laminar stress, weaken the shrinkage crack (comprising warm draw seam and shrinkage crack) of semi-rigid type base or cement concrete and reflection crack to the asphalt surface course transmission.
The technical scheme that addresses the above problem is: between the cement concrete pavement that the asphalt macadam stress absorption layer that is provided is arranged on the bitumen layer of semi-rigid type base and its top making or composite pavement and the bitumen layer of its top overlay, said asphalt macadam stress absorption layer is from the top down successively by macadam, stress absorption tack coat and articulamentum are formed, and wherein the material of stress absorption tack coat is: polymer modification mulseal (as SBR modified emulsifying asphalt or EVA modified emulsifying asphalt etc.), the high viscosity mulseal, a kind of in SBS heat modification pitch or the rubber modified asphalt; The material of articulamentum is: kerosene cutback asphalt, height ooze a kind of in mulseal, concrete interface cementing agent, polymer modification mulseal or the heat modification pitch.
For semi-rigid type base, said articulamentum is also referred to as layer, and its material can adopt kerosene cutback asphalt or high ooze a kind of in the mulseal.
The shared weight ratio of above-mentioned kerosene cutback asphalt medium pitch can be 50~70%.
For the cement concrete pavement of composite pavement, articulamentum is also referred to as the interface adhesion coating, and its material can adopt a kind of in concrete interface cementing agent, polymer modification mulseal or the heat modification pitch.
Above-mentioned ballast grain sizes is: hard, coarse, wear-resisting and clean one or both of 5~10mm, 10~15mm or 10~20mm.
The construction method step of asphalt macadam stress absorption layer of the present invention is as follows:
(1) semi-rigid type base or cement concrete pavement surface are carried out plucking, purified treatment;
(2) spill cloth articulamentum material, said articulamentum material is: kerosene cutback asphalt, height ooze a kind of in mulseal, concrete interface cementing agent, polymer modification mulseal (as SBR or EVA modified emulsifying asphalt etc.) or the heat modification pitch;
(3) spill cloth stress absorption bonding layer material, said stress absorption bonding layer material is a kind of in polymer modification mulseal, high viscosity mulseal, SBS heat modification pitch or the rubber modified asphalt;
(4) spreading rubble;
(5) rubber tire rolls;
(6) can implement the laying of asphalt surface course to the Construction traffic open to traffic after the health.
Above-mentioned steps (3) and step (4) are preferably carried out synchronously, promptly spill behind the cloth stress absorption binding material in several seconds spreading rubble material immediately.Be controlled at 3~6 seconds the blanking time of step (3) and step (4) generally speaking.
Advantage of the present invention is: stress absorbing layer of the present invention effectively absorbs and has subdued semi-rigid asphalt pavement or composite pavement inter-laminar stress, weakens the shrinkage crack of semi-rigid type base or cement concrete pavement and reflection crack to the asphalt surface course transmission.Can make simultaneously the cement concrete pavement of semi-rigid type base or composite pavement become as a whole with the asphalt surface course secure bond of its top making; waterproof and tack coat are united two into one; not only play waterproof action, and sub-layer is played the certain protection effect.Effectively improve the road surface functional performance, prolong service life of road surface, reduce later stage highway maintenance cost.Mechanized is convenient in the present invention, and construction technology is easy, and construction speed is fast, and integrated cost is low.
The present invention also can be used for high-grade highway cement concrete bridge floor waterproofing.
Description of drawings
Fig. 1 is a kind of structural representation of stress absorbing layer of the present invention.
Fig. 2 is second kind of structural representation of stress absorbing layer of the present invention.
Embodiment 1
Below in conjunction with Fig. 1 the construction sequence of present embodiment is illustrated.
(1) semi-rigid type base 1 is a lime fine coal stabilization gravel.Before semi-rigid type base rolls the back health or health after three days, in time adopting brusher (car) that the substrate surface hacking also will be floated ash blows off, the top layer aggregate particle is partly exposed, substrate surface is still had the position of " minute surface " phenomenon, adopt small-sized milling machine to carry out local milling hacking and cleaning is handled;
(2) adopt full-automatic pitch sprinkling car to spill cloth articulamentum (saturating layer) material 2: kerosene cutback asphalt (pitch: kerosene=60: 40), spill cloth amount 0.5~0.8kg/m 2, spill Bu Wendu and be not higher than 70 ℃;
(3) treat that laminar surface is little dried, adopt full-automatic pitch sprinkling car to spill cloth SBR modified emulsifying asphalt stress absorption binding material 3, spill cloth amount 0.3~0.8kg/m 2, spill 150~170 ℃ of Bu Wendu;
(4) adopt full-automatic rubble truck spreader spreading rubble 4, rubble specification 5~10mm, coverage scale 70~80%;
(5) rubber tire rolls, and makes rubble and pitch bonding good.It is slow that rolling speed is wanted, and should adopt 1.5~2.0km/h;
(6) construction was finished the rear enclosed health 3 days, got final product open to traffic or carried out the construction of asphalt surface course 5 on it.
Embodiment 2
Construction sequence is substantially the same manner as Example 1, and different is: adopt the synchronous surface dressing car to spill cloth stress absorption binding material and spreading rubble simultaneously, its time interval is 3~6 seconds; Semi-rigid type base is a cement stabilized macadam; Antireflective material layer is that height oozes mulseal, spills cloth amount 0.4~0.8kg/m 2, spill 150~170 ℃ of Bu Wendu; The stress absorption binding material is the high viscosity mulseal, spills cloth amount 0.4~1.0kg/m 2, spill 160~180 ℃ of Bu Wendu;
Embodiment 3
The basic unit of composite pavement is a cement concrete pavement.
(1) adopts milling machine that the milling plucking is carried out in the rigid pavement, make the rigid pavement form coarse, concavo-convex surface texture structure, and surperficial floating dust is cleaned, blows off;
(2) smear or spill cloth articulamentum (interface adhesion coating) material: the concrete interface binding material;
(3) adopt full-automatic pitch sprinkling car to spill cloth stress absorption binding material: SBS heat modification pitch, spill cloth amount 0.8~2.0kg/m 2, spill 170~180 ℃ of Bu Wendu;
(4) take full-automatic crushed stone sealing car spreading rubble, rubble specification 10~20mm, coverage scale 70~80%;
(5) rubber tire rolls, and makes rubble and pitch bonding good.
(6) health.
Embodiment 4
Composite pavement basic unit is a cement concrete pavement.Construction sequence is substantially the same manner as Example 3, and different is: adopt the synchronous surface dressing car to spill cloth stress absorption binding material and spreading rubble simultaneously, its time interval is 3~6 seconds; Articulamentum (interface adhesion coating) material: the high viscosity mulseal, spill cloth amount 0.4~1.0kg/m 2, spill 160~180 ℃ of Bu Wendu; The stress absorption binding material: rubber modified asphalt, spill cloth amount 1.0~2.5kg/m 2, spill 180~190 ℃ of Bu Wendu.
Embodiment 5
Referring to Fig. 2: composite pavement basic unit is a cement concrete pavement 21, interface sticking material 22 is the high viscosity mulseal, construction sequence is substantially the same manner as Example 3, different is: the spreading rubble 4 that spills cloth stress absorption binding material 3 and step (4) of step (3) respectively carries out twice construction, after to be first pass step (3) with step (4) construction finish immediately repeating step (3) carry out second time construction with step (4), wherein the rubble of second time (4) is that (specification is less than 10~20mm) of first pass, coverage scale 70~80% for 5~10mm or 10~15mm.
Embodiment 6
Composite pavement basic unit is a cement concrete pavement.Construction sequence is substantially the same manner as Example 5, and different is: adopt the synchronous surface dressing car to spill cloth stress absorption binding material 3 and spreading rubble 4 simultaneously, its time interval is 3~6 seconds.
Through test and detection, the stress absorbing layer performance of the foregoing description is as follows:
Project Example 1 Example 2 Example 3 Example 4 Example 5 Test method
Shear strength MPa (60 ℃) 0.43 0.48 0.42 0.44 0.42 The shear strength instrument
Water percolating capacity (ml/min) 0 0.5 0 1.5 2.0 T0971
Wheels-locked testing (having or not skin breakage, passing or intermediate peeling) Do not have Do not have Do not have Do not have Do not have Stop so that 50km/h is anxious with the BZZ-60 standard automobile after 7 days
From the above, stress absorbing layer shear strength of the present invention is higher, and interlayer is in conjunction with better, and anti-seepage effect is obvious.

Claims (3)

1. asphalt macadam stress absorption layer, between the cement concrete pavement that is arranged on the bitumen layer of semi-rigid type base and its top making or composite pavement and the bitumen layer of its top overlay, it is characterized in that said asphalt macadam stress absorption layer is made up of macadam, stress absorption tack coat and articulamentum from the top down successively, wherein the material of stress absorption tack coat is: a kind of in polymer modification mulseal, high viscosity mulseal, SBS heat modification pitch or the rubber modified asphalt; The material of articulamentum is: kerosene cutback asphalt, height ooze a kind of in mulseal, concrete interface cementing agent, polymer modification mulseal or the heat modification pitch, the shared weight ratio of said kerosene cutback asphalt medium pitch is 50~70%, and said polymer modification mulseal is SBR modified emulsifying asphalt or EVA modified emulsifying asphalt; The ballast grain sizes of macadam is one or both among 5~10mm, 10~15mm or the 10~20mm.
2. realize the job practices of the described asphalt macadam stress absorption layer of claim 1, its step is as follows:
(1) to semi-rigid type base or cement concrete pavement surface purify, plucking handles;
(2) spill cloth articulamentum material, said articulamentum material is a kind of in kerosene cutback asphalt, SBR modified emulsifying asphalt, EVA modified emulsifying asphalt, concrete interface cementing agent or the heat modification pitch;
(3) spill cloth stress absorption bonding layer material, said stress absorption bonding layer material is a kind of in SBR modified emulsifying asphalt, EVA modified emulsifying asphalt, high viscosity mulseal, SBS heat modification pitch or the rubber modified asphalt;
(4) spreading rubble;
(5) rubber tire rolls.
3. job practices according to claim 2 is characterized in that step (3) and step (4) carry out synchronously, promptly spills behind the cloth stress absorption binding material in several seconds spreading rubble immediately.
CN200710019042XA 2007-11-12 2007-11-12 Asphalt macadam stress absorption layer and construction method thereof CN101148856B (en)

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Application Number Priority Date Filing Date Title
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