Semi-flexible heavy-duty pavement paving structure

A semi-flexible, pavement technology, applied to cohesive pavement paved on site, roads, roads, etc., can solve the problems of low fatigue resistance, inability to interweave, small fluidity, etc., to improve rutting resistance and fatigue resistance , Prevent early water damage and prolong the service life

Active Publication Date: 2014-06-18
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this poured semi-flexible pavement structure also has its shortcomings: ① It is difficult to ensure the continuity of the voids of the open-graded parent asphalt mixture, so it is difficult to fully fill the voids of the open-graded parent asphalt mixture with cement mortar ; ②The cement mortar can only wrap the mineral material of the parent asphalt mixture indirectly, and cannot interweave well with the asphalt mortar and finally form a uniform spatial network structure, resulting in the gap between asphalt, cement mortar and aggregate. The interface adhesion is not good
However, the fluidity of these two kinds of mortars is relatively small, and it is easy to segregate when used in semi-flexible pavement base materials, and it is difficult to form uniformly. lower

Method used

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  • Semi-flexible heavy-duty pavement paving structure
  • Semi-flexible heavy-duty pavement paving structure
  • Semi-flexible heavy-duty pavement paving structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1) Determination of mineral material gradation

[0068] The basalt mineral materials are selected for crushing and screening, and the various grades of mineral materials are mixed in a certain proportion to obtain the synthetic gradation of different structural layers in the following table 4:

[0069] Table 4 Mineral gradation of pavement structure layer

[0070]

[0071] Among them, the physical and chemical properties of basalt coarse aggregate, fine aggregate and limestone powder are as follows:

[0072] Table 5 Physical and chemical properties of aggregate and mineral powder

[0073]

[0074] 2) Preparation of cement

[0075] ① Preparation of high viscosity modified asphalt

[0076] Choose AH-50 bitumen, heat it to melt, add SBS791, waste rubber powder, APAO modifier, Hersbit858, carbon 9 petroleum resin in mass ratio 100:7:5:4:5:3, and cut at 175℃ Cut for 30 minutes and react at 180°C for 3 hours to obtain a high-viscosity modified asphalt binder. The properties of the high-...

Embodiment 2

[0110] 1) Determination of mineral material gradation

[0111] Select limestone mineral material for crushing and screening, and mix each grade of mineral material in a certain proportion to obtain the synthetic gradation of different structural layers in the following table 13:

[0112] Table 13 Mineral gradation of pavement structure layer

[0113]

[0114]

[0115] Among them, the physical and chemical properties of limestone coarse aggregate, fine aggregate and limestone powder are as follows:

[0116] Table 14 Physical and chemical properties of aggregate and mineral powder

[0117]

[0118] 2) Preparation of cement

[0119] ① Preparation of high viscosity modified asphalt

[0120] Select AH-70 bitumen, heat it to melt, add SBS791, waste rubber powder, APAO modifier, Hersbit858, carbon 9 petroleum resin in mass ratio 100:10:12:3:3:3, and cut at 175℃ Cut for 30 minutes and react at 180°C for 3 hours to obtain a high-viscosity modified asphalt binder. The properties of the high-viscos...

Embodiment 3

[0154] 1) Determination of mineral material gradation

[0155] Diabase mineral material is selected for crushing and screening, and each grade of mineral material is mixed in a certain proportion to obtain the synthetic gradation of different structural layers in the following table 20:

[0156] Table 20 Mineral gradation of pavement structure layer

[0157]

[0158] Among them, the physical and chemical properties of diabase coarse aggregate, fine aggregate and limestone ore powder are shown in Table 21:

[0159] Table 21 Physical and Chemical Properties of Aggregate and Mineral Powder

[0160]

[0161] 2) Preparation of cement

[0162] ① Preparation of high viscosity modified asphalt

[0163] Select AH-90 bitumen, heat it to melt, add SBS791, waste rubber powder, APAO modifier, Hersbit858, carbon 9 petroleum resin in mass ratio 100:10:12:3:3:3, and cut at 175℃ Cut for 30 minutes and react at 180°C for 3 hours to obtain a high-viscosity modified asphalt binder. The properties of the hig...

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Abstract

The invention relates to a semi-flexible heavy-duty pavement paving structure. The semi-flexible heavy-duty pavement paving structure comprises a surface layer having a thickness of 4-6cm and made of a high-viscosity modified asphalt mixture of SMA-13 or SMA-16, a middle surface layer having a thickness of 6-10cm and made of a high-modulus asphalt mixture of AC-EME14 or AC-EME20, a lower surface layer having a thickness of 10-12cm and made of a low-grade asphalt mixture of ATB-25 or ATB-30, and a semi-flexible base layer having a thickness of 6-12cm and made of skeleton solid cement-emulsified asphalt concrete; a high-viscosity modified asphalt bonding layer is arranged between the surface layer and the middle surface layer, between the middle surface layer and the lower surface layer and between the lower surface layer and the semi-flexible base layer, and the spreading quantity of the high-viscosity modified asphalt bonding layer per unit area is 0.6-0.8kg/m<2>; and an ES-2 modified emulsified asphalt slurry is arranged between the semi-flexible base layer and a bottom base layer, and has a suitable thickness of 6-10mm. The structure improves the rut resistance and the fatigue resistance of a pavement, and prolongs the service life of the pavement.

Description

Technical field [0001] The invention relates to the field of road engineering, in particular to a semi-flexible heavy-load pavement structure. Background technique [0002] With the rapid development of high-grade highway construction in my country, semi-rigid bases have gradually become the mainstream mode of pavement structure design due to their excellent bearing capacity and low cost. However, after decades of construction and vehicle operation inspections, it has been proved that this kind of pavement structure is brittle, has poor internal drainage performance, poor resistance to deformation, and is more sensitive to changes in ambient temperature and humidity. It is prone to cracks and gradually penetrates upwards, causing reflections. crack. At the same time, due to the current increasing traffic volume, heavy load and overload, and most asphalt surface layers are thinner, the active road surface is damaged very seriously before the design period. In the design of high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/32
Inventor 彭煜蔺习雄
Owner PETROCHINA CO LTD
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