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Construction method of asphalt surface course under overcast, rainy, wet and cold conditions

A construction method and asphalt pavement technology, which can be applied to cohesive pavement paved on site, roads, climate change adaptation, etc., can solve problems such as construction and inability to carry out asphalt pavement, and achieve strong pavement tensile capacity and interlayer Combining good quality with great results

Inactive Publication Date: 2012-12-26
CHINA RAILWAY NO 5 ENG GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: Aiming at the problem that asphalt pavement construction cannot be carried out under rainy, humid and severe cold conditions, a construction method of asphalt pavement under severe cold and rainy conditions is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Take SMA-13 ​​asphalt pavement as an example:

[0021] Step 1: Use the JTG F40 Marshall method to design warm-mix asphalt mixtures, design warm-mix asphalt mixtures and prepare raw materials for rainy and humid areas and expressways with heavy traffic, use coarse-grained dense-graded asphalt mixtures, and mix them into flat The S-type gradation curve; the mass percentage of stones with various particle sizes in the total solid material is: 10-15mm gravel accounts for 30%, 5-10mm gravel accounts for 37%, and 3-5mm gravel accounts for 37%. Crushed stone accounts for 4%, 0-3mm crushed stone accounts for 17%, and mineral powder accounts for 10%.

[0022] Step 2, mixing in the mixing tank to produce warm mix asphalt mixture, first put the heated stone into the mixing tank and stir, then use the warm mixing agent as an admixture and SBS modified asphalt in a mass ratio of 5:95 Spray into the mixing tank synchronously. The warm mix agent will be sprayed in 3 sec...

Embodiment 2

[0026] Embodiment 2: Take SMA-13 ​​asphalt pavement as an example:

[0027] Step 1: Use the JTG F40 Marshall method to design warm-mix asphalt mixtures, design warm-mix asphalt mixtures and prepare raw materials for rainy and humid areas and expressways with heavy traffic, use coarse-grained dense-graded asphalt mixtures, and mix them into flat The S-type gradation curve; the mass percentage of stones with various particle sizes in the total solid material is: 10-15mm crushed stones account for 30%, 5-10mm crushed stones account for 40%, and 3-5mm crushed stones account for 40%. Crushed stone accounts for 5%, 0-3mm crushed stone accounts for 16%, and mineral powder accounts for 9%.

[0028] Step 2, mixing in the mixing tank to produce warm mix asphalt mixture, first put the heated stone into the mixing tank and stir, then use the warm mixing agent as an admixture and SBS modified asphalt in a mass ratio of 5:95 Spray into the mixing tank synchronously. The warm mix agent will...

Embodiment 3

[0032] Embodiment 3: Take the SMA-13 ​​asphalt pavement as an example:

[0033] Step 1: Use the JTG F40 Marshall method to design warm-mix asphalt mixtures, design warm-mix asphalt mixtures and prepare raw materials for rainy and humid areas and expressways with heavy traffic, use coarse-grained dense-graded asphalt mixtures, and mix them into flat The S-type gradation curve; the mass percentage of stones with various particle sizes in the total solid material is: 10-15mm gravel accounts for 34%, 5-10mm gravel accounts for 34%, 3-5mm gravel accounts for 34%, and 3-5mm gravel accounts for 34%. Crushed stone accounts for 3%, 0-3mm crushed stone accounts for 18%, and mineral powder accounts for 11%.

[0034] Step 2, mixing in the mixing tank to produce warm mix asphalt mixture, first put the heated stone into the mixing tank and stir, then use the warm mixing agent as an admixture and SBS modified asphalt in a mass ratio of 5:95 Spray into the mixing tank synchronously. The warm...

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PUM

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Abstract

The invention discloses a construction method of an asphalt surface course in a low temperature and wet environment, and the construction method comprises the steps of designing a warm mixed asphalt mixture and preparing a raw material; adopting a coarse dense-graded asphalt mixture and forming a level S-shaped grading curve, mixing and producing the warm mixed asphalt mixture in a mixing cylinder, transporting the warm mixed asphalt mixture to a construction site, drying and heating a pavement, keeping a working plane dry, paving the warm mixed asphalt mixture continuously and uniformly, and conducting initial rolling, rerolling and final rolling on the pavement. The invention provides a general and feasible drying method of the wet, icy and snowy working plane. A heater used for reclamation construction of the asphalt pavement is adopted to heat and dry the pavement, so that the problem that the asphalt surface course cannot be constructed in the low temperature and wet environment in winter is solved.

Description

technical field [0001] The invention relates to a construction method of an asphalt surface layer. Background technique [0002] In winter, under the conditions of low temperature, high air humidity, abundant rainfall, ice and snow and humid areas, rainy and humid and severe cold conditions, it is impossible to pave asphalt on the road. The main reasons are as follows: [0003] ① The outside temperature is lower than 10°C required by the "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), and the temperature of the asphalt mixture loses quickly, making it difficult to compact and form; [0004] ② The working face is wet for a long time, and the asphalt surface construction is unconditional; [0005] ③ The emulsified asphalt sticky layer cannot be effectively demulsified in time, which affects the bonding quality between layers. [0006] At present, there is no comprehensive construction method for asphalt pavement construction in rainy, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/18
CPCY02A30/30Y02A30/60
Inventor 黎春江李林胡英海
Owner CHINA RAILWAY NO 5 ENG GRP
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