CN214831604U

CN214831604U - Sisal fiber ECC (error correction code) coated asphalt layer composite pavement

Info

Publication number: CN214831604U
Application number: CN202022845072.XU
Authority: CN
Inventors: 陈伟宏; 陈世伟; 姚仲泳; 贾云飞
Original assignee: Urban And Rural Construction And Transportation Service Center Of Pingtan Comprehensive Experimental Zone; Fuzhou University
Current assignee: Urban And Rural Construction And Transportation Service Center Of Pingtan Comprehensive Experimental Zone; Fuzhou University
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-11-23
Anticipated expiration: 2030-12-02

Abstract

The utility model discloses a sisal hemp fibre ECC coats asphalt layer combined type road surface, including the road bed upper berth is equipped with cement level and joins in marriage the rubble sublayer base layer cement level is joined in marriage rubble sublayer upper berth and is equipped with cement and stabilizes rubble basic unit cement is stabilized rubble basic unit upper berth and is equipped with sisal hemp fibre ECC layer upper berth is equipped with the interface performance enhancement layer, and the interface performance enhancement layer upper berth is equipped with epoxy asphalt concrete layer. The utility model discloses simple structure, the structure has better cohesive strength between each layer in road surface, can effectively prevent early diseases such as road surface crack, water damage, rut with sisal hemp fibre ECC as the bearing layer and produce, improves road surface durability greatly, increase of service life. The driving comfort can be improved after the asphalt layer is covered on the road surface, and meanwhile, the road surface cost can be obviously reduced due to the reduction of the thickness of the asphalt layer, the environmental protection is facilitated, and good social benefits and huge economic benefits are embodied.

Description

Sisal fiber ECC (error correction code) coated asphalt layer composite pavement

Technical Field

The utility model belongs to the technical field of the road, a road surface structure is related to, especially a sisal fiber ECC coats pitch layer combined type road surface on.

Background

In recent years, the construction of highways has been rapidly developed, and the semi-rigid base asphalt pavement accounts for more than 90% of the high-grade highways. However, the semi-rigid base materials such as cement stabilized aggregates, fly ash stabilized aggregates and the like which are commonly used at present are designed according to the dense grading, and the problems of reflection cracks, poor drainage, insufficient bearing capacity and the like often exist in the use process, so that early damage such as cracking, pot holes and the like occurs in the early stage of use of a plurality of newly-built pavements, the early damage is far short of the design years, the durability is insufficient, the exertion of the road use performance is seriously influenced, and the severe social influence and great economic loss are caused.

The highway pavement material adopted at present in China is mainly asphalt concrete, wherein the epoxy asphalt concrete has the best performance. It has better durability and fatigue resistance, better high-temperature and low-temperature performance and strong resistance to chemical substance corrosion. However, the preparation process of the epoxy asphalt concrete is complex, and related preparation technologies belong to patents abroad, so that the quality of domestic epoxy asphalt concrete cannot be improved all the time, the quality of materials needs to be ensured by means of imported epoxy asphalt concrete, and the price is high. In addition, the epoxy asphalt has higher requirements on the construction technology, strict control on temperature and time and great difficulty. Therefore, a material is found to replace the epoxy asphalt, and the material has very important significance for improving economic benefit and social benefit.

Sisal fiber ECC (engineered cellulosic composites) is a composite material composed of cement, sand, water, mineral admixtures and sisal fibers, and has the characteristics of high strength, high ductility, wear resistance, acid-base resistance, weather resistance and the like. The ECC ultimate tensile strain can stably reach more than 3%, the ultimate tensile strain of concrete is only 0.01%, the ultimate tensile strain of the steel bar with better tensile strength is only 1%, and the steel bar shows great ductility. The compression resistance of ECC is equivalent to that of common reinforced concrete. The largest advantage of ECC is its ultra-high ductility, which shows the characteristic of multi-crack under the action of direct tensile load, the maximum crack width does not exceed 100 μm, and the spacing is only 1-2 mm. Therefore, the large deformation and the multiple-joint cracking of the pavement structure have the potential of solving the problems of cracking of the pavement structure, corrosion of a pavement slab and the like. In addition, the sisal fibers needed by the sisal fiber ECC manufacturing are low in cost, large-scale production is facilitated, and the performance is good in the existing steel bridge deck pavement precedent. China is a big cement production country, and the sisal fiber ECC material applied to pavement can exert cost advantage and reduce manufacturing cost. Therefore, the improvement of the performance of the cement concrete to adapt to and improve the characteristics of the pavement layer has good research significance and practical significance. The sisal fiber ECC is used as the bearing layer, so that early diseases such as pavement cracks, water damage, tracks and the like can be effectively prevented, the durability of the pavement is greatly improved, and the service life is prolonged. However, as the sisal fiber ECC material does not contain coarse aggregate, the wear resistance is poor, and in order to ensure better driving comfort and convenient construction operation, the wearing layer on the pavement surface is paved by adopting epoxy asphalt concrete. The driving comfort can be improved after the asphalt layer is covered on the road surface, and meanwhile, the road surface cost can be obviously reduced due to the reduction of the thickness of the asphalt layer, the environmental protection is facilitated, and good social benefits and huge economic benefits are embodied. The novel pavement structure has important research significance and practical value.

Disclosure of Invention

The technical scheme of the utility model lies in: the composite pavement comprises a roadbed, wherein a cement graded broken stone subbase layer is paved on the roadbed, a cement stabilized broken stone base layer is paved on the cement graded broken stone subbase layer, a sisal fiber ECC layer is paved on the cement stabilized broken stone base layer, an interface performance enhancement layer is paved on the sisal fiber ECC layer, and an epoxy asphalt concrete layer is paved on the interface performance enhancement layer.

Further, the thickness of the sisal fiber ECC layer is 50 mm, the sisal fiber ECC layer is used as a bearing layer of a pavement, and the sisal fiber reinforced cement-based composite material is prepared from the raw materials and the dosage of water of 280 plus 300kg/m³(ii) a Cement 310-330kg/m³(ii) a Fine sand 680-700kg/m³(ii) a Coal ash 680-700kg/m³(ii) a Sisal fiber 24-28kg/m³(ii) a 10-15kg/m of high-efficiency water reducing agent³(ii) a 0.15-0.18kg/m of adhesive³. Wherein, the cement is selected from P, II, 42.5R;

the fly ash is I-grade fly ash, the 45-micron screen residue is not more than 12 percent, and the water demand ratio is not more than 95 percent; the fine sand gradation is as follows: a square-hole sieve with the size of 1.18mm, the fine sand passing rate of 100 percent, a square-hole sieve with the size of 0.6mm, the fine sand passing rate of 44.6 percent, a square-hole sieve with the size of 0.3mm, the fine sand passing rate of 10.8 percent, a square-hole sieve with the size of 0.15mm, and the fine sand passing rate of 0 percent; the high-efficiency water reducing agent is a polycarboxylic acid water reducing agent; the adhesive is hydroxypropyl methylcellulose; the sisal fiber is made of a material with the diameter of 150-300 mu m and the length of 10-20 mm, the elastic modulus of the material is 15-30 GPa, and the elongation is 6-8%.

Further, the preparation method of the sisal fiber cement-based composite material comprises the following steps: firstly, sequentially adding cement, fly ash and fine sand into a stirrer, and pre-stirring for 2 min; then uniformly sprinkling hydroxypropyl methylcellulose powder serving as an adhesive into the stirred material, sprinkling the powder while stirring, and stirring for 5 min; gradually adding water and a water reducing agent to the dry mixture until a uniform mixture is produced; adding sisal fiber gradually, and mixing for 3min until the fiber is uniformly dispersed.

Further, the thickness of the epoxy asphalt concrete layer is 30-40 mm.

Further, the thickness of the interface performance enhancement layer is 1-2 mm. The emulsified asphalt modified by the SBR composite binder is used as an interface performance enhancement layer, and the general dosage is 0.4-0.6 kg/m² 。

Furthermore, the thickness of the cement graded macadam subbase layer is 10cm, the cement graded macadam subbase layer can be an old asphalt pavement or an old cement concrete pavement which is subjected to rubblization treatment, and the rubblization treatment of the old pavement can avoid the generation of waste materials, so that the cost is saved; on the other hand, the old pavement as the subbase layer can provide enough support for the pavement and better exert the performance of the pavement; the cement stabilized macadam base layer is 10cm thick, and graded stabilized macadams with the flexibility characteristic are adopted, so that reflection cracks can be inhibited, the warm and humid states of upper and lower layer materials can be improved, the crack resistance of the base layer material can be improved, and the reflection cracks of a post-construction pavement can be inhibited.

Compared with the prior art, the beneficial effects of the utility model are that: the sisal fiber needed by the sisal fiber ECC manufacturing has low cost, simple construction process, convenient control and large-scale production, and has good performance in the prior steel bridge deck pavement precedent. China is a big cement production country, and the sisal fiber ECC material applied to pavement can exert cost advantage and reduce manufacturing cost. The sisal fiber ECC is used as the bearing layer, so that early diseases such as pavement cracks, water damage, tracks and the like can be effectively prevented, the durability of the pavement is greatly improved, and the service life is prolonged. The driving comfort can be improved after the asphalt layer is covered on the road surface, and meanwhile, the road surface cost can be obviously reduced due to the reduction of the thickness of the asphalt layer, the environmental protection is facilitated, and good social benefits and huge economic benefits are embodied. The novel pavement structure has important research significance and practical value.

Drawings

FIG. 1 is a schematic view of a composite pavement structure of an asphalt layer coated on sisal fiber ECC of the present invention;

in the figure: the concrete comprises a 1-epoxy asphalt concrete layer, a 2-interface performance enhancement layer, a 3-sisal fiber ECC layer, a 4-cement stabilized macadam base layer, a 5-cement graded macadam subbase layer and a 6-roadbed.

Detailed Description

In order to make the aforementioned features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.

Refer to FIG. 1

The utility model provides a sisal hemp fibre ECC coats asphalt layer combined type road surface, includes road bed 6 upper berth is equipped with cement gradation rubble subbase 5 upper berth is equipped with cement stabilized macadam basic unit 4 upper berth is equipped with sisal hemp fibre ECC layer 3 upper berth is equipped with interface performance enhancement layer 2, and interface performance enhancement layer 2 upper berth is equipped with epoxy asphalt concrete layer 1.

In this embodiment, the thickness of the sisal fiber ECC layer is 50 mm, and the raw material formula is as follows: 300kg/m water³42.5 grade Portland cement 310kg/m³690kg/m of fine sand³690kg/m of fly ash³Sisal fiber 24kg/m³12kg/m of polycarboxylic acid water reducing agent³0.15kg/m of hydroxypropyl methyl cellulose as a binder³。

Wherein, the cement is selected from P, II, 42.5R; the fly ash is I-grade fly ash, the 45-micron sieve residue is not more than 12 percent, the water requirement ratio is not more than 95 percent, and the main active chemical component is SiO₂With Al₂O₃The water-soluble polymer can react with hydrogen generated by cement hydration to generate a gelled product, and plays a role in densely filling concrete. The high-efficiency water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is more than 20%, and the cement particles are dispersed through the surface physical and chemical action, so that the fluidity of a matrix is improved, and the water consumption is reduced. The fine sand gradation is as follows: a square-hole sieve with the size of 1.18mm, the fine sand passing rate of 100 percent, a square-hole sieve with the size of 0.6mm, the fine sand passing rate of 44.6 percent, a square-hole sieve with the size of 0.3mm, the fine sand passing rate of 10.8 percent, a square-hole sieve with the size of 0.15mm, and the fine sand passing rate of 0 percent; the adhesive is hydroxypropyl methylcellulose; selecting a material with the diameter of 150-300 mu m and the length of 10-20 mm as the sisal fiber, and making the sisal fiber elasticThe modulus of elasticity is 15-30 GPa, and the elongation is 6-8%.

In this embodiment, the thickness of the epoxy asphalt concrete layer is 30-40 mm.

In this embodiment, the thickness of the interface performance enhancing layer is 1-2 mm.

In this embodiment, the thickness of the cement graded broken stone subbase layer is 10 cm; the thickness of the cement stabilized macadam foundation is 10 cm.

The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.

Claims

1. The utility model provides a sisal fiber ECC coats asphalt layer combined type road surface which characterized in that: the road surface includes road bed (6) upper berth is equipped with cement gradation rubble subbase (5) upper berth is equipped with cement stabilized macadam basic unit (4) upper berth is equipped with sisal hemp fibre ECC layer (3) upper berth is equipped with interface performance enhancement layer (2) upper berth is equipped with epoxy asphalt concrete layer (1).

2. The sisal fiber ECC coated asphalt layer composite pavement according to claim 1, wherein: the thickness of the sisal fiber ECC layer (3) is 50 mm.

3. The sisal fiber ECC coated asphalt layer composite pavement according to claim 1, wherein: the thickness of the epoxy asphalt concrete layer (1) is 30-40 mm.

4. The sisal fiber ECC coated asphalt layer composite pavement according to claim 1, wherein the thickness of the interface performance enhancement layer (2) is 1-2 mm.

5. The sisal fiber ECC coated asphalt layer composite pavement according to any one of claims 1-4, wherein the cement graded macadam sub-base layer (5) has a thickness of 10 cm; the thickness of the cement stabilized macadam foundation (4) is 10 cm.