CN201003134Y

CN201003134Y - Rolled flexible fiber cement concrete pavement structure

Info

Publication number: CN201003134Y
Application number: CNU2006201639085U
Authority: CN
Inventors: 易志坚; 马银华; 杨庆国; 何小兵; 赵朝华; 李建伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-30
Filing date: 2006-12-30
Publication date: 2008-01-09
Anticipated expiration: 2016-12-30

Abstract

The utility model relates to a grinding soft fiber cement and beton road structure and relates to the road structure. The utility model utilizes the mixed soft fiber and the cement slurry as cementation felt detritus, sand and filling; a surface layer 1 which is grinded by the soft fiber emulsification asphaltum steady material is spread on the road base 2. The early plastic shrinking, the dry shrinking and the warm shrinking of the soft fiber soft fiber emulsification asphaltum steady material are improved after adding the soft fiber; the breaking proof, the tenacity, the attacking proof, the freezing proof, the erosion proof and the water stability function of the utility model are obviously enhanced; and the fatigue proof capability of the utility model is enhanced by times. The road structure has the advantages of a strong deformation capability, a good breaking proof function and a good fatigue proof function.

Description

Road surface structure of rolling flexiable fibre cement concrete

One, technical field

The utility model relates to pavement engineerings such as highway construction, especially a kind of road surface structure of rolling flexiable fibre cement concrete.

Two, background technology

The background technology of cement concrete material and job practices aspect thereof

1, (cast) cement concrete

Cement concrete material is a kind of widely known constructional materials, though concrete development has only the history in more than 100 year, nowadays become most widely used in the world wide, consumption is maximum, the constructional materials that almost is seen everywhere.Cement concrete with the cement slurry of inorganic material as adhesive material, bonding rubble and sand.The cement concrete of plastic state has certain fluidity, and closely knit for the inside concrete after guaranteeing to solidify, the general Vibration Technology that adopts is constructed during cast plastic state concrete, and cement paste solidifies the back and forms hard concrete as building stones.The characteristics that it has the convenience of drawing materials, construction is simple, intensity is high, can make arbitrary shape.Yet cement concrete material has himself unsurmountable weakness: the early solidification amount of contraction is big, the inner initial imperfection that easily produces; Cement concrete fragility is big, and it is poor, easy to crack to adapt to deformability, therefore people's resistance of always being devoted to cement concrete for a long time split, the research of toughness reinforcing aspect.

In recent years, the appearance of steel fiber feinforced cement concrete, organic flexible fiber cement concrete makes this material of concrete go on a new developing stage.The tension of steel fiber feinforced cement concrete, flexible fiber cement concrete, impact strength, toughness all are improved largely, thereby have obtained using comparatively widely, wherein are most widely used so that steel fiber feinforced cement is concrete especially.

Fiber cement concrete has obtained certain utilization in Structural Engineering, road surface and bridge deck works at present.The construction technology of fiber cement concrete adopts and the identical technology of portland cement concrete construction: require fiber cement concrete that bigger flowability is arranged, slump is poured into a mould the back vibration compacting generally at 3-5cm, and general making thickness is 5-25cm.

In use there is following subject matter in existing fiber cement concrete material: when fiber type adopts the steel fibre of high-elastic mould, on the one hand because the fibers content in the steel fiber feinforced cement concrete big (steel fibre that adds 78kg in every cubic meter of concrete approximately), cause that steel fiber feinforced cement is concrete to involve great expense, significantly improved the engineering construction cost.On the other hand, because steel fibre is harder, make the steel fiber feinforced cement concrete inconvenience of mixing and stirring and construct.When fiber type adopts synthetic fibers, because the fiber cement concrete water/binder ratio is big, concrete plastic shrinkage, drying shrinkage are bigger, therefore the fibrous concrete surface layer must be provided with the transverse contraction seam one every about 4～6 meters, the road surface transverse joint is more not only can to influence road-ability, also can increase rainwater simultaneously from the probability that transverse joint infiltrates basic unit, cause basic unit at the bottom of the road slab to wash away and come to nothing, thereby cause disconnected plate to destroy.

2, roll cement concrete

Rolling cement concrete is a kind of new concrete that grows up in the last thirty years.It has particular performances, the performance of roller compacted concrete is not different from conventional concrete fully before not solidifying, not solidified roller compacted concrete denseness is very dried, no slump concrete than worker China Democratic National Construction Association is also done, be that a kind of slump is zero super no slump concrete, it can make bulldozer, road roller work and do not sink thereon, and is very approaching with the concrete performance of routine again after solidifying.Roller compacted concrete makes stone overcome frictional resistance and occupies space formation skeleton by the effect of road roller vibration force, and hole is filled and wrapped up by cement mortar, forms compacting body.

Roll that cement concrete has that the construction machinery capacity is big, speed is fast, the characteristics of large tracts of land operation.It has intensity height, good endurance, saving cement, advantage that drying shrinkage is little.

Roll cement concrete and aspect the build of the build of water conservancy project dam body and high grade highway pavement more application is being arranged.Roll cement concrete pavement from material property, still belong to the category of conventional cement concrete, it is out of shape bad adaptability, fragility is big, crack resistance is poor.Therefore if do not establish the shrinkage joint, the crack appears in regular meeting in the road surface, at present when pavement construction, usually every 10～15m a shrinkage joint is set in the road surface.

In recent years, for raising rolls the cracking resistance of cement concrete pavement, the cement concrete pavement that rolls of steel fibre occurred mixing, its research at home and abroad is at the early-stage.The engineering applicable cases that external steel fibre rolls cement concrete pavement structure shows, the functional performance on road surface and durability are improved and improve, but (generally mix 30kg～40kg in every cubic meter of concrete because the volume of steel fibre is higher, even it is higher), involve great expense, and in the roller compacted concrete of moisture content less, mix the steel fibre of rigidity, fiber is difficult for disperseing, mix and stir difficulty, it is not too convenient to construct, therefore, the steel fibre large scale application that rolls cement concrete has been subjected to certain restriction.

Three, summary of the invention

The purpose of this utility model is: by mix flexible fiber in portland cement concrete, improve anti-contraction, cracking resistance, shock resistance, resistance to deformation, freeze proof, the anti-fatigue performance of cement concrete material, and the adjustment by Mixture Ratio, it can be built on sub-surface as top course by roller-compaction, constitute road surface structure of rolling flexiable fibre cement concrete together.

The technical scheme that the utility model purpose is taked is as follows:

The utility model road structure includes and rolls flexible fiber cement concrete pavement surface layer, basic unit, rolls flexible fiber cement concrete pavement surface layer at the substrate surface making.

The utility model, basic unit can be the basic unit that is suitable for building the various types of existing cement concrete pavement or asphalt concrete pavement thereon, also can be original road surface of old road: as cement concrete pavement, perhaps flexible pavement.

The utility model, roll that flexible fiber cement concrete pavement surface layer is made up of flexible fiber, cement, rubble, sand, water, filler and Admixture etc. and adhered to one anotherly behind mix constitute, above-mentioned material contains 0.2～3kg, 160～400kg, 1100～2000kg, 100～800kg, 80～160kg, 0～500kg, 0～4kg by weight in every cubic metre of flexible fiber cement concrete, rolls flexible fiber cement concrete pavement surface layer through rolling to form.

The utility model, flexible fiber is meant with respect to rigid fiber (high-elastic modulus fibre, as steel fibre), modulus of elasticity is less than the low-elasticity-modulus organic synthetic fibers of cement concrete bullet mould, as polypropylene fibre, polyacrylonitrile fibre, polyamide (nylon) fiber etc.Mixing of flexible fiber improved performances such as the anti-contraction, cracking resistance, shock resistance, resistance to deformation of cement concrete material, freeze proof, antifatigue.

The utility model, flexible fiber can be monfil, also can be reticular fibre, also can be the composite fibre of monfil and reticular fibre.

The utility model is a kind of new road structure pattern, and it has following advantage:

(1) compare with existing cement concrete, the cement mixing content that rolls in the flexible fiber cement concrete reduces, and has the strong advantage of economy.

(2) compare with existing portland cement concrete, the water supply volume that rolls in the flexible fiber cement concrete is few, dry shrinkage of concrete rate, plastic shrinkage are out of shape little, in addition, disorderly also help reducing concrete plastic shrinkage to the flexible fiber that distributes, strengthen the ability of concrete opposing shrinkage cracking, therefore can significantly prolong the spacing of surface layer transverse contraction seam.

(3) compare with existing portland cement concrete, roll the internal construction composition that the flexible fiber cement concrete has improved facing concrete, form the framework compact type structure, reduced the generation of inner microcrack, therefore help improving concrete combination property.

(4) compare with existing portland cement concrete, roll flexible fiber cement concrete early strength height, curing time, is short, and open to traffic early.

(5) compare with the existing cement concrete pavement structure that rolls, it is strong that facing concrete in the road surface structure of rolling flexiable fibre cement concrete has a cracking resistance, good toughness, the intensity height, anti-fatigue performance is good, shock resistance is strong, the advantage of good frost resistance, therefore the suitable thickness on attenuate road surface has good economic benefit.

(6) compare with the existing cement concrete pavement structure that rolls, under identical faces layer thickness situation, road surface structure of rolling flexiable fibre cement concrete has better pavement performance and durability, indirect economic effect and obvious social benefit.

In sum, the utility model is a kind ofly not only to be different from existing fiber cement concrete road structure but also be different from the existing novel road surface structure that rolls cement concrete pavement structure.

The utility model can with existing cement concrete pavement or the existing condition that rolls cement concrete identical faces layer thickness under, improve performances such as concrete cracking resistance, toughness, antifatigue, significantly improve the pavement performance and the durability of road; Can descend in the prerequisite that guarantees good pavement performance, durability and hang down the thickness of road surface surface layer, bring remarkable economic efficiency; Roll the flexible fiber cement concrete pavement and draw materials conveniently, construction is simple, quick.

Four, description of drawings

Further specify the utility model below in conjunction with accompanying drawing.

Accompanying drawing is the road structure schematic cross-sectional view.

Among the figure, 1---rolling flexible fiber cement concrete pavement surface layer 2---basic unit

Five, the specific embodiment

As shown in drawings, roll flexible fiber cement concrete pavement surface layer 1 at basic unit's 2 surperficial makings.

Claims

1, a kind of road surface structure of rolling flexiable fibre cement concrete includes and rolls flexible fiber cement concrete pavement surface layer (1), basic unit (2), it is characterized in that rolling flexible fiber cement concrete pavement surface layer (1) at the surperficial making of basic unit (2).