CN101581066B - Water conservation temperature reduction half-flexible pavement and construction method thereof - Google Patents
Water conservation temperature reduction half-flexible pavement and construction method thereof Download PDFInfo
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Abstract
The invention discloses a water conservation temperature reduction half-flexible pavement. The pavement is formed by porous basic asphalt mixture; the pore of the porous basic asphalt mixture is filled by cement base water conservation mucilage. The porous basic asphalt mixture is formed by mixing high viscosity rubber modified asphalt with the brookfield viscosity of 1.5 to 4.0 Pa-S, aggregate and mineral powder when the detection temperature is 175 DEG C. The construction method is as follows: the porous basic asphalt mixture is paved on a compacted basic level; the cement base water conservation mucilage is used for grouting construction on the porous basic asphalt mixture; the pore of the porous basic asphalt mixture is filled; redundant sizing agent on the pavement is cleared. The water conservation temperature reduction half-flexible pavement overcomes the respective shortcoming of cement pavement and asphalt pavement, has the high strength, good toughness, long service life, gives the particular water conservation temperature reduction function on the pavement; the pavement temperature can be reduced by more than 10 to 20 DEG C; the water conservation temperature reduction half-flexible pavement has the remarkable ecological, technical, economic and social benefits.
Description
Technical field the invention belongs to the road construction technology, particularly a kind of have keep road surface moisture, the water conservation temperature reduction half-flexible pavement that can reduce road surface and environment temperature and job practices thereof.
Background technology is because the city area development is huge day by day, densely populated, waterproof building area increases, the heat extraction machine is various, the probability of its surface soil of natural precipitation infiltration as a result reduces greatly, city heat balance is damaged, so that the road surface heat can't discharge, even causes the dwelling environment city of high temperature " heat island " effect day by day.Improving city " heat island " effect, reduce influence, conserve water resource to ecology, become one of major subjects of world today's ecology and fwaater resources protection, also is the new technology that the highway engineering in China construction field is demanded research and development urgently.At present, the highway in China type mainly contains two kinds of forms: cement pavement and flexible pavement.Respectively there are its pluses and minuses on these two kinds of road surfaces, are good, the long service life of intensity height, planeness as the cement pavement advantage; Shortcoming be rigidity big, travel that it is big to jolt, repair difficulty.The advantage of flexible pavement is that pliability is good, driving is comfortable, easy to maintenance; Shortcoming is that supporting capacity is low, high temperature rut, application life are short.This shows that the cement pavement rigidity is had a surplus, and pliable and tough deficiency; Have a surplus and flexible pavement is pliable and tough, and the rigidity deficiency.If both characteristics can be organically combined the purpose of then can reach mutual supplement with each other's advantages, tempering toughness with gentleness.In addition, all there is a common ground on two kinds of road surfaces, and are promptly waterproof.Therefore, no matter existing road surface is cement pavement or flexible pavement, all can not accomplish to absorb moisture, water conservation temperature reduction, to such an extent as to ecological environment around regulating.The Chinese patent publication number is CN101096837, open day is on January 2nd, 2008, invention and created name is " semi-flexible composite road surface structure and a construction method thereof ", a kind of semi-flexible composite road surface structure and construction method thereof are disclosed in this application case, its weak point is, the type structure is squeezed in closely knit-skeleton embedding that this semi-flexible composite pavement belongs to, it is that Asphalt Mixture Design is become big void content, fill its hole with the cement mixed mortar, utilize the intensity that forms after the gluing of cement mixing rubber cement and density and bituminous mixture cage construction to resist the effect and the waterproof of carload jointly, but do not have water conservation temperature reduction, reduce the effect of highway surrounding enviroment temperature.
Summary of the invention provides that a kind of supporting capacity is strong, good toughness, particularly can water conservation temperature reduction, reduce highway surrounding enviroment temperature, and the water conservation temperature reduction half-flexible pavement of long service life and job practices thereof.
For achieving the above object, the present invention adopts following technical scheme:
A kind of water conservation temperature reduction half-flexible pavement, described road surface is made of the matrix bituminous mixture of porous, and the hole of the matrix bituminous mixture of porous is filled by cement based water conservation rubber cement.
The matrix bituminous mixture of porous has the hole of some, and the filling that can be cement based water conservation rubber cement provides occasion; The matrix bituminous mixture of porous also can be used as the road surface skeleton, and produces certain intensity with the acting in conjunction of cement based water conservation rubber cement, bears the load action of vehicle.Cement based water conservation rubber cement has the characteristic that absorbs and keep moisture, and when environment temperature raise, the moisture of absorption is evaporation constantly, thereby reaches the effect that reduces road surface and surrounding enviroment temperature.
Preferably, the matrix bituminous mixture of described porous is during by 175 ℃ of detected temperatures, and brookfield viscosity is that the component that high viscosity rubbers modified bitumen, aggregate, the breeze of 1.5-4.0PaS pressed the row weight portion mixes:
Rubber modified asphalt: 2.9～3.1 parts;
Aggregate: 91.1～95.2 parts;
Breeze: 1.9～5.8 parts.
Be to guarantee the mixed effect of rubber modified asphalt, aggregate and breeze, above-mentioned three kinds of materials should mix under 160-170 ℃ of temperature, and aggregate and breeze must be warming up to 190 ℃ in advance before mixing.Rubber modified asphalt pitch, aggregate and breeze are by interacting, and formed matrix bituminous mixture had both had certain intensity, also form the hole of some simultaneously.
Preferably, the void content of the matrix bituminous mixture of described porous is 20%～28%, stability 〉=3.0kN, and flow valuve is 20～50/0.1mm, thickness is 5～15cm.
The void content of the matrix bituminous mixture of porous is one of principal element that influences grouting construction operation and pavement strength.When void content was too small, bituminous mixture was more closely knit, and cement based water conservation rubber cement can't pour into the hole of bituminous mixture; When void content was excessive, bituminous mixture was loose relatively, can not form solid skeleton, caused pavement strength to descend.Test shows that the void content of the matrix bituminous mixture of porous is 20%～28%, and is proper.
Preferably, described cement based water conservation rubber cement is mixed by following components in part by weight:
Water-keeping material: 5.5～6.5 parts;
Cement: 41.5 parts;
Fine sand: 20 parts;
Breeze: 10 parts;
Water: 63.5～73.5 parts.
At first, take by weighing each component of cement based water conservation rubber cement by weight, then, add cement, fine sand, breeze and water-keeping material successively, continue in the time of reinforced to stir, be mixed to evenly; Add entry, continue to stir, be mixed to evenly, can make cement based water conservation rubber cement.
Wherein, water-keeping material plays suction and water retention in the water conservation rubber cement of road surface.The water-keeping material inside configuration has a large amount of holes, in case meet water, can promptly absorb the moisture of surrounding environment, forms expansile water-soluble structure and the lasting moisture that keeps.Cement, fine sand, breeze and water acting in conjunction produce intensity.At first, cement and water generation chemical reaction generate the hydrated product of some, and then form network-like compact texture; Secondly, fine sand, breeze by with hydrated product gluing, the further ruggedized construction of filling pore.The common cooperation of cement, fine sand, breeze, water and water-keeping material can make every indexs such as intensity, flowability and water retention of road surface water conservation rubber cement reach balance, and satisfy the requirement of Japanese road association " explanation of the flexible pavement engineering universal standard ".
Preferably, described water-keeping material is one or more in slag powders, pottery sand, kieselguhr, high hydroscopic resin, the water-loss reducer.
Slag powders is a kind of pulverulent material of blast furnace slag behind grinding, because water-granulated slag genus polyporus vitreous structure, gives slag powders certain water absorbing capacity, its water absorption rate than the high 2%-4% of common rubble about.Pottery sand is the fine particle part in the haydite, is generally less than 5mm, and the inner structural features of haydite is fine and closely woven cellular micropore, and these micropores give pottery sand certain water absorption character.Kieselguhr is a kind of biogenic silicastone, mainly partly is made up of Diatomeae animal and other biological siliceous skeleton, and exquisiteness, loose, light weight, porous, water imbibition and the strong characteristic of permeability are arranged.The kieselguhr porosity reaches 80-90%, can the weight 1.5-4 of absorption water doubly own.High hydroscopic resin (originating from Tangshan Bo Yake skill Co., Ltd) claims super strength water absorbent again, it is the strong especially functional high molecule material of a kind of water absorbing capacity, can absorb the water that is equivalent to own wt hundred times even several thousand times, and the gel that generates after the imbibition has good water retention.Water-loss reducer (refers to agricultural water-loss reducer more, originate from Dongguan peace letter water conservation Co., Ltd) claim anti-drought water-retaining agent, NMF again, it is a kind of artificial synthetic high molecular polymer with super-strong moisture absorbing water conservation and releasability, the moisture that rapid absorptance self tuple of energy is hundred times helps improving soil texture and satisfies plant growing required.
Further preferred, described water-keeping material is that 0.075mm～4.75mm slag powders and kieselguhr are formed by granularity, and slag powders and kieselguhr are pressed row weight portion proportioning: slag powders: kieselguhr=1: 0.375～0.625.
Preferably, the degree of mobilization of cement based water conservation rubber cement is 10-14s, and method of testing is with reference to the pertinent regulations of Japanese half-flexible pavement, characterizes degree of mobilization with flow through time of certain altitude funnel of cement mortar, rupture strength＞2.0MPa behind the health 7d, the compressive strength behind the health 7d is 10～30MPa.
The job practices of the flexible highway of above-mentioned water conservation temperature reduction half may further comprise the steps:
A), in the basic unit of compacting, lay the matrix asphaltic road-mix surface course of porous;
B), on the matrix bituminous mixture of porous, carry out grouting construction, the hole of the matrix bituminous mixture of porous is filled with cement based water conservation rubber cement;
During construction, the mix surface temperature should drop to 50 ℃.Grouting construction can adopt artificial or vibratory equipment, rubber cement sprinkling wagon; When running into certain longitudinal gradient, grouting is in proper order for to be hoisted by lower.
For guaranteeing the road surface outward appearance, can manually remove unnecessary slurry after grouting is finished or spray retarding agent, treat inner slurry sclerosis afterflush surface, road surface slurry.
C), remove redundant sizing agent on the road surface.Need before the open to traffic carry out health to slurry, conditioned time and mode are looked temperature and slurry character and different.
As require to reach certain landscape effect, can mix and stir with the toner that breeze adds certain composition in the preparation process of road surface water conservation rubber cement.
The beneficial effect of a kind of water conservation temperature reduction half-flexible pavement of the present invention and job practices thereof is, by road surface water conservation rubber cement is combined in a certain way with the matrix bituminous mixture of porous, cement pavement and flexible pavement advantage separately can be carried out complementation, realization has certain intensity and pliability concurrently, thereby improves road surface functional performance and durability, has overcome the shortcoming separately of cement pavement and flexible pavement, intensity height not only, and good toughness, long service life has certain technical benefits; Because the high water absorbing capacity of water-keeping material in the cement based water conservation rubber cement, make the road surface have unique water retention, can reclaim rainwater and other source moisture and the conserve water resource, utilize simultaneously the high water absorbing capacity of road surface water conservation rubber cement material again, give this road surface exclusive water conservation temperature reduction function, heat is taken away in the evaporation of moisture during by high temperature, and pavement temperature can reduce more than 10～20 ℃, even can regulate ecological environment on every side, thereby have significant ecology, technology, economic and social benefit.
Invention is further described the specific embodiment to this reality below in conjunction with the specific embodiment, but does not therefore limit the present invention among the described scope of embodiments.
Embodiment 1
A kind of water conservation temperature reduction half-flexible pavement, described road surface is made of the matrix bituminous mixture of porous, and the hole of the matrix bituminous mixture of porous is filled by cement based water conservation rubber cement.
The preparation of cement based water conservation rubber cement:
Add 28.4% cement, 13.7% fine sand, 6.8 breezes, 2.74% slag powders and 1.37% kieselguhr successively, continue in the time of reinforced to stir about 1--2min, be mixed to evenly; Add 46.99% water, stir about 2--3min, mix, can make this cement based water conservation rubber cement material.Test shows that the performance of gained cement based water conservation rubber cement is as shown in table 1.
The performance of table 1 cement based water conservation rubber cement
| Index | Result of the test | Claimed range |
| Degree of mobilization (s) | 13.5 | 10-14 |
| 7d compressive strength (MPa) | 22.1 | 10-30 |
| 7d rupture strength (MPa) | 2.4 | ＞2.0 |
| Water retention (%) | 27.7 | ＞20 |
The construction sequence of water conservation temperature reduction half-flexible pavement is: in the basic unit of compacting, lay water conservation temperature reduction half-flexible pavement, in the road surface matrix bituminous mixture of porous by 3.0% rubber modified asphalt, 93.2% aggregate, the even mix of 3.8% breeze; The void content of matrix bituminous mixture is 20%～28%, stability 〉=3.0kN, and flow valuve is 20～50/0.1mm, thickness can be selected at 5～15cm according to design road surface load.
The matrix bituminous mixture treats that surface temperature drops to the grouting construction that carries out cement based water conservation rubber cement after 50 ℃ after laying and finishing, and the degree of mobilization of water conservation rubber cement is 10-14s, can adopt artificial, vibratory equipment, rubber cement sprinkling wagon to carry out grouting construction; When running into certain longitudinal gradient, grouting is in proper order for to be hoisted by lower.
For guaranteeing the road surface outward appearance, after finishing, grouting can manually remove unnecessary slurry; Or the sprinkling retarding agent, treat inner slurry sclerosis afterflush surface, road surface slurry.
Need carry out health before the open to traffic, conditioned time and mode are looked construction temperature with slurry character and different.
As require to reach certain landscape effect, can mix and stir with the toner that breeze adds certain composition in the preparation process of cement based water conservation rubber cement.
Embodiment 2
A kind of water conservation temperature reduction half-flexible pavement, described road surface is made of the matrix bituminous mixture of porous, and the hole of the matrix bituminous mixture of porous is filled by cement based water conservation rubber cement;
The preparation of cement based water conservation rubber cement:
Add 29.5% cement, 14.2% fine sand, 7.1% breeze, 2.85% slag powders and 1.07% kieselguhr successively, continue in the time of reinforced to stir about 1--2min, be mixed to evenly; Add 45.28% water, stir about 2--3min, mix, can make this cement based water conservation rubber cement material.Test shows that the performance of gained cement based water conservation rubber cement is as shown in table 2.
The performance of table 2 cement based water conservation rubber cement
| Index | Result of the test | Claimed range |
| Degree of mobilization (s) | 13.4 | 10-14 |
| 7d compressive strength (MPa) | 19.8 | 10-30 |
| 7d rupture strength (MPa) | 2.3 | ＞2.0 |
| Water retention (%) | 24.8 | ＞20 |
The construction sequence of water conservation temperature reduction half-flexible pavement is: in the basic unit of compacting, lay the water conservation temperature reduction half-flexible pavement surface layer, in the surface layer open gradation porous matrix bituminous mixture by 2.9% rubber modified asphalt, 95.2% aggregate, the even mix of 1.9% breeze; The void content of matrix bituminous mixture is 20%～28%, stability 〉=3.0kN, and flow valuve is 20～50/0.1mm, thickness can be selected at 5～15cm according to design road surface load.
As follows embodiment 1.
Embodiment 3
A kind of water conservation temperature reduction half-flexible pavement, described road surface is made of the matrix bituminous mixture of porous, and the hole of the matrix bituminous mixture of porous is filled by cement based water conservation rubber cement;
The preparation of cement based water conservation rubber cement:
Add 27.4% cement, 13.2% fine sand, 6.6% breeze, 2.65% slag powders and 1.65% kieselguhr successively, continue in the time of reinforced to stir about 1--2min, be mixed to evenly; Add 48.5% water, stir about 2--3min, mix, can make this cement based water conservation rubber cement material.Test shows that the performance of gained cement based water conservation rubber cement is as shown in table 3.
The performance of table 3 cement based water conservation rubber cement
| Index | Result of the test | Claimed range |
| Degree of mobilization (s) | 13.6 | 10-14 |
| 7d compressive strength (MPa) | 21.3 | 10-30 |
| 7d rupture strength (MPa) | 2.2 | ＞2.0 |
| Water retention (%) | 27.6 | ＞20 |
The construction sequence of water conservation temperature reduction half-flexible pavement is: lay the matrix bituminous mixture of porous in the basic unit of compacting, the matrix bituminous mixture of porous is by 3.1% rubber modified asphalt, 91.1% aggregate, the even mix of 5.8% breeze; The void content of matrix bituminous mixture is 20%～28%, stability 〉=3.0kN, and flow valuve is 20～50/0.1mm, thickness can be selected at 5～15cm according to design road surface load.
As follows embodiment 1.
Embodiment 4
A kind of water conservation temperature reduction half-flexible pavement, described road surface is made of the matrix bituminous mixture of porous, and the hole of the matrix bituminous mixture of porous is filled by cement based water conservation rubber cement;
The preparation of cement based water conservation rubber cement:
Add 29.5% cement, 14.2% fine sand, 7.1% breeze, 4% high hydroscopic resin successively, continue in the time of reinforced to stir about 1--2min, be mixed to evenly; Add 45.2% water, stir about 2--3min, mix, can make this cement based water conservation rubber cement material.Test shows that the performance of gained cement based water conservation rubber cement is as shown in table 4.
The performance of table 4 cement based water conservation rubber cement
| Index | Result of the test | Claimed range |
| Degree of mobilization (s) | 5.6 | 10-14 |
| 7d compressive strength (MPa) | 2.3 | 10-30 |
| 7d rupture strength (MPa) | 6.2 | ＞2.0 |
| Water retention (%) | 57.6 | ＞20 |
The construction sequence of water conservation temperature reduction half-flexible pavement is: lay the matrix bituminous mixture of porous in the basic unit of compacting, the matrix bituminous mixture of porous is by 3.0% rubber modified asphalt, 93.2% aggregate, the even mix of 3.8% breeze; The void content of matrix bituminous mixture is 20%～28%, stability 〉=3.0kN, and flow valuve is 20～50/0.1mm, thickness can be selected at 5～15cm according to design road surface load.
As follows embodiment 1.
Embodiment 5
A kind of water conservation temperature reduction half-flexible pavement, described road surface is made of the matrix bituminous mixture of porous, and the hole of the matrix bituminous mixture of porous is filled by cement based water conservation rubber cement;
The preparation of cement based water conservation rubber cement:
Add 29.5% cement, 14.2% fine sand, 7.1% breeze, 4% pottery sand successively, continue in the time of reinforced to stir about 1--2min, be mixed to evenly; Add 45.2% water, stir about 2--3min, mix, can make this cement based water conservation rubber cement material.Test shows that the performance of gained cement based water conservation rubber cement is as shown in table 5.
The performance of table 5 cement based water conservation rubber cement
| Index | Result of the test | Claimed range |
| Degree of mobilization (s) | 8.6 | 10-14 |
| 7d compressive strength (MPa) | 29.7 | 10-30 |
| 7d rupture strength (MPa) | 5.2 | ＞2.0 |
| Water retention (%) | 3.9 | ＞20 |
The construction sequence of water conservation temperature reduction half-flexible pavement is: lay the matrix bituminous mixture of porous in the basic unit of compacting, the matrix bituminous mixture of porous is by 3.1% rubber modified asphalt, 91.1% aggregate, the even mix of 5.8% breeze; The void content of matrix bituminous mixture is 20%～28%, stability 〉=3.0kN, and flow valuve is 20～50/0.1mm, thickness can be selected at 5～15cm according to design road surface load.
As follows embodiment 1.
Embodiment 6
A kind of water conservation temperature reduction half-flexible pavement, described road surface is made of the matrix bituminous mixture of porous, and the hole of the matrix bituminous mixture of porous is filled by cement based water conservation rubber cement;
The preparation of cement based water conservation rubber cement:
Add 29.5% cement, 14.2% fine sand, 7.1% breeze, 4% water-loss reducer successively, continue in the time of reinforced to stir about 1--2min, be mixed to evenly; Add 45.2% water, stir about 2--3min, mix, can make this cement based water conservation rubber cement material.Test shows that the performance of gained cement based water conservation rubber cement is as shown in table 6.
The performance of table 6 cement based water conservation rubber cement
| Index | Result of the test | Claimed range |
| Degree of mobilization (s) | 4.8 | 10-14 |
| 7d compressive strength (MPa) | 2.5 | 10-30 |
| 7d rupture strength (MPa) | 5.6 | ＞2.0 |
| Water retention (%) | 48.9 | ＞20 |
The construction sequence of water conservation temperature reduction half-flexible pavement is: lay the matrix bituminous mixture of porous in the basic unit of compacting, the matrix bituminous mixture of porous is by 2.9% rubber modified asphalt, 95.2% aggregate, the even mix of 1.9% breeze; The void content of matrix bituminous mixture is 20%～28%, stability 〉=3.0kN, and flow valuve is 20～50/0.1mm, thickness can be selected at 5～15cm according to design road surface load.
As follows embodiment 1.
Claims (5)
1. water conservation temperature reduction half-flexible pavement, it is characterized in that: described road surface is made of the matrix bituminous mixture of porous, and the hole of the matrix bituminous mixture of porous is filled by cement based water conservation rubber cement;
Described cement based water conservation rubber cement is mixed by following components in part by weight:
Water-keeping material: 5.5～6.5 parts;
Cement: 41.5 parts;
Fine sand: 20 parts;
Breeze: 10 parts;
Water: 63.5～73.5 parts;
Described water-keeping material is one or more in slag powders, pottery sand, kieselguhr, high hydroscopic resin, the water-loss reducer.
2. water conservation temperature reduction half-flexible pavement according to claim 1, it is characterized in that: the matrix bituminous mixture of described porous is during by 175 ℃ of detected temperatures, and brookfield viscosity is that the component that high viscosity rubbers modified bitumen, aggregate, the breeze of 1.5-4.0PaS pressed the row weight portion mixes:
Rubber modified asphalt: 2.9～3.1 parts;
Aggregate: 91.1～95.2 parts;
Breeze: 1.9～5.8 parts.
3. water conservation temperature reduction half-flexible pavement according to claim 1 is characterized in that: the void content of the matrix bituminous mixture of described porous is 20%～28%, stability 〉=3.0kN, and flow valuve is 20～50/0.1mm, thickness is 5～15cm.
4. water conservation temperature reduction half-flexible pavement according to claim 1, it is characterized in that: described water-keeping material is that 0.075mm～4.75mm slag powders and kieselguhr are formed by granularity, and slag powders and kieselguhr are pressed row weight portion proportioning: slag powders: kieselguhr=1: 0.375～0.625.
5. water conservation temperature reduction half-flexible pavement according to claim 1 is characterized in that: the degree of mobilization of cement based water conservation rubber cement is 10-14s, the rupture strength＞2.0MPa behind the health 7d, and the compressive strength behind the health 7d is 10～30MPa.
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