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High-speed railway subgrade asphalt graded crushed stone and preparation method thereof

A technology for high-speed railways and graded crushed stones, which is applied to roads, roads, and coagulating pavements paved on site, etc. It can solve problems affecting the waterproof and drainage effect of railways, water damage to asphalt concrete, and threats to the safe operation of trains, so as to avoid Effects of water damage and aging phenomena, strong adaptability to deformation, and good water-repellent ability

Active Publication Date: 2021-12-21
BEIJING TIEKE SPECIAL ENG TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During use, excessive porosity will aggravate the water damage and aging of asphalt concrete, that is, looseness, spalling and other diseases; in addition, with the increase of service life, the large voids that were originally used for rapid infiltration of surface water will be used. Dust, soil and other sundries are blocked, causing the drainage effect to weaken, which in turn affects the waterproof and drainage effect of the railway, and even seriously threatens the safe operation of the train

Method used

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  • High-speed railway subgrade asphalt graded crushed stone and preparation method thereof
  • High-speed railway subgrade asphalt graded crushed stone and preparation method thereof
  • High-speed railway subgrade asphalt graded crushed stone and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Raw material testing

[0037] (1) Modified asphalt

[0038] SBS modified asphalt is selected, and its measured technical indicators and technical requirements are shown in Table 1.

[0039] Table 1 Technical requirements of SBS modified asphalt

[0040]

[0041] (2) Aggregate

[0042] The performance test results of coarse and fine aggregates are shown in Tables 2 and 3.

[0043] Table 2 Measured properties and technical requirements of coarse aggregate

[0044]

[0045] Table 3 Measured properties and technical requirements of fine aggregate

[0046]

[0047] (3) The measured performance and technical requirements of the limestone powder used are shown in Table 4.

[0048] Table 4 Limestone powder measured performance and technical requirements

[0049]

[0050] 2. Aggregate Grading Design

[0051] According to the aggregate grading range in asphalt graded crushed stone and the sieving of aggregates of corresponding specifications, the ratio of synt...

Embodiment 2

[0070] Except that the modified asphalt was selected as SBR modified asphalt, the rest of the raw materials were selected from the same raw materials and gradation as in Example 1, only the construction process and the amount of reinforcing agent were changed.

[0071] Preparation:

[0072] SBS modified asphalt is selected, and its measured technical indicators and technical requirements are shown in Table 8.

[0073] Table 8 Technical requirements for SBR modified asphalt

[0074]

[0075] Taking the total mass of asphalt graded crushed stone on the high-speed railway roadbed as the benchmark,

[0076] (1) Preheat 4.94% SBR modified asphalt to 175°C for 5 hours; 86.06% aggregate to 195°C for 5 hours; 8% limestone powder to 195°C, Preheating time is 5h;

[0077] (2) Mix 1% asphalt reinforcing agent and the preheated aggregate evenly, the mixing temperature is 190°C, and the mixing time is 30s;

[0078] (3) Then, add the preheated SBS modified asphalt, continue to mix ev...

Embodiment 3

[0085] Select the same raw materials and gradation as in Example 1, only changing the construction process and reinforcing agent dosage.

[0086] Preparation:

[0087] Taking the total mass of asphalt graded crushed stone on the high-speed railway roadbed as the benchmark,

[0088] (1) Preheat 6.0% SBS modified asphalt to 170°C for 4 hours; 88.2% aggregate to 190°C for 4 hours; 5% limestone powder to 190°C, The warm-up time is 4h;

[0089] (2) Mix 0.8% asphalt reinforcing agent and the preheated aggregate evenly, the mixing temperature is 185°C, and the mixing time is 15s;

[0090] (3) Then, add the preheated SBS modified asphalt, continue to mix evenly, the mixing temperature is 185°C, and the mixing time is 85s;

[0091] (4) Then, add the preheated limestone powder, continue to mix uniformly to obtain high-speed railway subgrade asphalt graded gravel, the mixing temperature is 185°C, and the mixing time is 85s.

[0092] See Table 10 for performance evaluation

[0093] T...

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Abstract

The invention provides a high-speed railway subgrade asphalt graded gravel, which comprises the following components: taking the total mass of the high-speed railway subgrade asphalt graded gravel as the basis, 85%-90% aggregate, 3%-8% Limestone powder, 3.5%-6.0% SBS modified asphalt and / or SBR modified asphalt, 0.1%-1% asphalt reinforcement. The invention also provides a method for preparing the high-speed railway subgrade asphalt graded crushed stone of the invention. The high-speed railway subgrade asphalt graded crushed stone of the invention is used in the railway subgrade bed structure, which can improve the stress of the railway subgrade, and improve the bearing capacity and waterproof and drainage capacity of the subgrade. The high-speed railway subgrade asphalt graded crushed stone of the invention has obvious economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of railway engineering material preparation. Specifically, the present invention relates to high-speed railway subgrade asphalt graded gravel and a preparation method thereof. Background technique [0002] At present, the railway subgrade structure in my country is mainly composed of the surface layer of the subgrade bed and the bottom layer of the subgrade bed. The surface layer of the subgrade bed is made of graded gravel, which can be subdivided into type I graded gravel and type II graded gravel. Various diseases of high-speed railway subgrades (such as frost heaving, slopping, subsidence, swelling and arching, etc.) are closely related to the impact of water, and their occurrence and deterioration are directly and indirectly related to water intrusion into the subgrade. my country's high-speed railway generally adopts the subgrade structure with graded gravel or cement-mixed graded gravel as the surfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26E01C7/18E01C7/26C04B111/27C04B111/34
CPCC04B26/26E01C7/18E01C7/182E01C7/26C04B2111/0075C04B2111/27C04B2111/343C04B2201/50C04B14/02C04B14/28C04B2103/0068
Inventor 蔡德钩叶阳升石越峰楼梁伟韩自力魏少伟闫宏业姚建平陈锋叶晓宇李斯庞帅马明正杨斌曹渊东吕宋张也谢蛟周阳宗
Owner BEIJING TIEKE SPECIAL ENG TECH CO LTD