A modified hard asphalt for improving the high temperature performance of pouring asphalt concrete and its preparation method and pouring asphalt concrete

A technology of asphalt concrete and hard asphalt, which is applied in the direction of building insulation materials, building components, buildings, etc., can solve the problems of high-temperature stability and deficiency of castable asphalt mixture, shorten the mixing time, improve the service life, and obtain convenient effect

Inactive Publication Date: 2017-08-01
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although scholars at home and abroad have made a lot of explorations on the improvement of cast asphalt concrete in terms of modified hard asphalt, there are still no effective measures to solve the high temperature stability of cast asphalt mixture.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A modified hard asphalt to improve the high temperature performance of cast asphalt concrete is prepared from raw materials with the following weight ratio:

[0038] 75 parts of SBS (I-D) modified asphalt,

[0039] Trinidad Lake Bitumen 20 parts,

[0040] Qingchuanyan (NES-1) asphalt 5 parts.

[0041] The 25°C penetration of the SBS (I-D) modified asphalt is 40-60 (0.1mm), the 5°C ductility ≥ 20cm, and the softening point ≥ 60°C; the Trinidad Lake asphalt 25°C needle Penetration is 0~5(0.1mm), softening point≥90℃, ash content is 33%~38%, density is 1.3~1.5(g / cm 3 ); Qingchuan rock (NES-1) asphalt has an ash content of ≤15%, a particle size of ≤18 μm, and a water content of ≤2%.

[0042] The preparation method of the modified hard asphalt for improving the high temperature performance of cast asphalt concrete comprises the following steps:

[0043] S1. Take a certain quality of SBS (I-D) modified asphalt and Trinidad Lake asphalt (TLA) as raw materials, and place the...

Embodiment 2

[0048] A modified hard asphalt to improve the high temperature performance of cast asphalt concrete is prepared from raw materials with the following weight ratio:

[0049] 70 parts of SBS (I-D) modified asphalt,

[0050] Trinidad Lake Bitumen 24 parts,

[0051] Qingchuanyan (NES-1) asphalt 6 parts.

[0052] The 25°C penetration of the SBS (I-D) modified asphalt is 40-60 (0.1mm), the 5°C ductility ≥ 20cm, and the softening point ≥ 60°C; the Trinidad Lake asphalt 25°C needle Penetration is 0~5(0.1mm), softening point≥90℃, ash content is 33%~38%, density is 1.3~1.5(g / cm 3 ); Qingchuan rock (NES-1) asphalt has an ash content of ≤15%, a particle size of ≤18 μm, and a water content of ≤2%.

[0053] The preparation method of the modified hard asphalt for improving the high temperature performance of cast asphalt concrete comprises the following steps:

[0054] S1. Take a certain quality of SBS (I-D) modified asphalt and Trinidad Lake asphalt (TLA) as raw materials, and place the...

Embodiment 3

[0059] A modified hard asphalt to improve the high temperature performance of cast asphalt concrete is prepared from raw materials with the following weight ratio:

[0060] 71 parts of SBS (I-D) modified asphalt,

[0061] Trinidad Lake Bitumen 25 parts,

[0062] Qingchuan rock (NES-1) asphalt 4 parts.

[0063] The 25°C penetration of the SBS (I-D) modified asphalt is 40-60 (0.1mm), the 5°C ductility ≥ 20cm, and the softening point ≥ 60°C; the Trinidad Lake asphalt 25°C needle Penetration is 0~5(0.1mm), softening point≥90℃, ash content is 33%~38%, density is 1.3~1.5(g / cm 3 ); Qingchuan rock (NES-1) asphalt has an ash content of ≤15%, a particle size of ≤18 μm, and a water content of ≤2%.

[0064] The preparation method of the modified hard asphalt for improving the high temperature performance of cast asphalt concrete comprises the following steps:

[0065] S1. Take a certain quality of SBS (I-D) modified asphalt and Trinidad Lake asphalt (TLA) as raw materials, and place t...

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Abstract

The invention discloses a modified hard asphalt for improving the high-temperature performance of pouring asphalt concrete, which is prepared from raw materials with the following weight ratio: 70-75 parts of SBS (I-D) modified asphalt, Trinidad Lake asphalt 20 to 25 parts, 4 to 6 parts of Qingchuanyan (NES‑1) asphalt; its preparation method is also disclosed, including the following steps: heating and curing raw material SBS (I‑D) modified asphalt and raw Trinidad Lake asphalt Afterwards, it is uniformly mixed and maintained, and then the weighed Qingchuanyan (NES-1) asphalt is added to the mixed asphalt; the cast asphalt concrete prepared by using the modified hard asphalt is also disclosed. The beneficial effects of the invention are: it can effectively improve the high-temperature stability of pouring asphalt concrete, prevent the generation of rutting disease on the pavement layer of the steel bridge deck, greatly improve the service life of the bridge and the long-term road performance of the pavement layer; raw materials Easy to obtain, reasonable cost and simple process.

Description

technical field [0001] The invention relates to the technical field of road asphalt, in particular to a modified hard asphalt for improving the high-temperature performance of cast asphalt concrete, a preparation method thereof, and cast asphalt concrete. Background technique [0002] Orthotropic steel bridge decks are mostly used in long-span bridges and girder structures of large-span urban viaducts because of their light weight, convenient transportation and erection, and short construction period. The cast asphalt concrete is widely used in the construction of the pavement on the steel bridge deck due to its excellent waterproof performance, low temperature performance, anti-aging performance, anti-fatigue performance and excellent followability to the steel bridge deck. However, the obvious defect of cast asphalt concrete is its insufficient high temperature stability, and the steel bridge deck pavement layer using this concrete generally has rutting disease. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L53/02C04B26/26
Inventor 艾长发辛春福阳恩慧邱延峻肖川王福成
Owner SOUTHWEST JIAOTONG UNIV
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