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Asphalt graded broken stone for high-speed railway foundation bed and production method thereof

A technology of graded crushed stone and production method, which is applied to roads, roads, on-site coagulation pavement, etc., can solve the problems of inability to meet the functional requirements of high-speed railway asphalt graded crushed stone bed, lack of production methods, etc. Achieve good waterproof and impermeability, improve water-proof and drainage capabilities, and good high-temperature anti-deformation effects

Active Publication Date: 2020-10-09
BEIJING TIEKE SPECIAL ENG TECH CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing asphalt graded gravel only focuses on one or several aspects of performance such as load-bearing, water-repellent and drainage properties, low-temperature crack resistance, high-temperature stability, and weather resistance. Functional requirements of asphalt graded crushed stone bed, and the lack of matching production methods

Method used

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  • Asphalt graded broken stone for high-speed railway foundation bed and production method thereof
  • Asphalt graded broken stone for high-speed railway foundation bed and production method thereof
  • Asphalt graded broken stone for high-speed railway foundation bed and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] According to the following steps to prepare asphalt graded macadam with the specification of AGCS-16:

[0039] (1) Classify and preheat the SBS modified asphalt in the storage tank to 180°C for 6 hours;

[0040] (2) heating the aggregate to a temperature of 200°C, and drying the aggregate so that the residual water content of the aggregate is 0.1%;

[0041] (3) The aggregate is dry-mixed with a batch mixer, the dry-mixing time is 10s, and the dry-mixing temperature is 180°C;

[0042] (4) Add limestone powder, asphalt reinforcing agent and preheated SBS modified asphalt to the aggregate after dry mixing in step (3), and mix for 50 seconds.

[0043] (5) Produce and obtain asphalt graded gravel for high-speed railway bed.

[0044] The composition of asphalt graded macadam whose specification is AGCS-16 is: based on the total mass of asphalt graded macadam of high-speed railway subgrade, 90.0% of aggregate, 4.5% of limestone powder, 5.0% of SBS modified asphalt, and aspha...

Embodiment 2

[0053] Follow the steps below to prepare asphalt graded macadam with the specification of AGCS-20:

[0054] (1) Classify and preheat the SBR modified asphalt in the storage tank to 160°C for 3 hours;

[0055] (2) heating the aggregate to a temperature of 180°C, and drying the aggregate so that the residual water content of the aggregate is 0.6%;

[0056] (3) The aggregate is dry-mixed with a batch mixer, the dry-mixing time is 15s, and the dry-mixing temperature is 170°C;

[0057] (4) Add limestone powder, asphalt reinforcing agent and preheated SBR modified asphalt to the dry-mixed aggregate in step (3), and mix for 55 seconds.

[0058] (5) Produce and obtain asphalt graded gravel for high-speed railway bed.

[0059] The composition of asphalt graded macadam whose specification is AGCS-20 is: based on the total mass of asphalt graded macadam of high-speed railway subgrade, 89.0% of aggregate, 5.2% of limestone powder, 4.8% of SBR modified asphalt, and asphalt reinforcing ag...

Embodiment 3

[0068] Prepare asphalt graded macadam with specification AGCS-25 according to the following steps:

[0069] (1) Classify and preheat the SBS modified asphalt in the storage tank to 175°C for 5 hours;

[0070] (2) heating the aggregate to a temperature of 185° C., and drying the aggregate so that the residual water content of the aggregate is 0.3%;

[0071] (3) The aggregate is dry-mixed by a batch mixer, the dry-mixing time is 15s, and the dry-mixing temperature is 180°C;

[0072] (4) Add limestone powder, asphalt reinforcing agent and preheated SBS modified asphalt to the aggregate after dry mixing in step (3), and mix for 50 seconds.

[0073] (5) Produce and obtain asphalt graded gravel for high-speed railway bed.

[0074] The composition of asphalt graded macadam whose specification is AGCS-25 is: based on the total mass of asphalt graded macadam for high-speed railway subgrade, 90.2% of aggregate, 4.5% of limestone powder, 4.6% of SBR modified asphalt, and asphalt reinfo...

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Abstract

The invention provides a production method of asphalt graded broken stone for a high-speed railway foundation bed, which comprises the following steps: (1) preheating SBS modified asphalt and / or SBR modified asphalt in a storage tank to 160-180 DEG C in a graded manner for more than or equal to 3 hours; (2) heating an aggregate to 170-200 DEG C, and drying the aggregate until the residual water content of the aggregate is not more than 1%; (3) performing dry mixing on the aggregate for not shorter than 10 s, wherein the dry mixing temperature is 170-195 DEG C; and (4) adding limestone powder,an asphalt enhancer and preheated SBS modified asphalt and / or SBR modified asphalt into the aggregate subjected to dry mixing in the step (3), and mixing the components to produce the asphalt gradedbroken stone for the high-speed railway foundation bed. The invention also provides the asphalt graded broken stone for the high-speed railway foundation bed, which is produced by the method providedby the invention. The asphalt graded broken stone is excellent in performance, and can meet the stress and deformation requirements of a high-speed railway foundation bed structure.

Description

technical field [0001] The invention belongs to the technical field of high-speed railway embankment structures. Specifically, the present invention relates to an asphalt graded macadam used in high-speed railway bed and its production method. Background technique [0002] Asphalt graded macadam is composed of asphalt, coarse aggregate, fine aggregate, limestone powder, asphalt reinforcing agent, etc., and its full section is set on the surface of the subgrade bed. As a high-speed railway subgrade structure, it should meet the following functional requirements: (1) Asphalt graded macadam, as a part of the foundation bed structure, should have good bearing capacity. (2) Asphalt graded gravel is an important barrier to prevent surface water from entering the interior of the subgrade, and should have good waterproof and drainage performance. (3) Asphalt graded macadam should have good crack resistance and frost resistance, and good flexibility and relaxation ability in low te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26E01C7/18C04B111/20C04B111/27
CPCC04B26/26E01C7/18E01C7/182C04B2111/27C04B2111/20C04B14/02C04B14/06C04B14/28C04B24/08C04B24/00C04B2103/54C04B24/045
Inventor 石越峰楼梁伟姚建平叶阳升蔡德钩刘俊飞魏少伟吕宋耿琳曹渊东刘瑞闫宏业陈锋周阳宗
Owner BEIJING TIEKE SPECIAL ENG TECH CO LTD
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