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A stress-absorbing layer anti-cracking material mixed with coal gasification fine slag and its preparation method

A stress absorbing layer and coal gasification technology, which is applied in the field of asphalt pavement material preparation, can solve the problems of difficult construction, high cost, dependence on imported modified raw materials, etc., and achieves the effect of a simple preparation method.

Inactive Publication Date: 2018-11-09
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Subsequently, in China, Chang'an University and Hubei Provincial Department of Transportation began to introduce this technology, and developed a special modified asphalt for the corresponding stress-absorbing layer. It has been applied in paving projects and new asphalt pavement projects. According to field performance observations in the past ten years, no reflection cracks have appeared in the asphalt surface layer, which shows that the stress-absorbing layer has a good anti-cracking effect, but most of them have high cost and modified raw materials. Relying on imports, construction difficulties and other shortcomings, therefore, further in-depth development of stress-absorbing layer materials and promotion of stress-absorbing layer technology has important practical significance and economic value

Method used

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  • A stress-absorbing layer anti-cracking material mixed with coal gasification fine slag and its preparation method
  • A stress-absorbing layer anti-cracking material mixed with coal gasification fine slag and its preparation method
  • A stress-absorbing layer anti-cracking material mixed with coal gasification fine slag and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The preparation of the anti-cracking material of the stress absorbing layer mixed with coal gasification fine slag comprises the following steps:

[0041] Step 1, weighing 20 parts of coal gasification fine slag, 20 parts of 0-3mm stone chips, 50 parts of 3-5mm gravel, and 10 parts of SBS modified asphalt;

[0042] Step 2, heating the 0-3mm stone chips and 3-5mm gravel at a constant temperature of 180-190°C for 4 hours, and set aside;

[0043] Step 3, heating the coal gasification fine slag at a temperature of 150-160°C for 3 hours at a constant temperature, and set aside;

[0044] Step 4, heating the SBS-modified asphalt to 170-180°C, and fully stirring evenly, and set aside;

[0045] Step 5: Put 0-3mm stone chips, 3-5mm gravel and coal gasification fine slag heated at constant temperature in the asphalt mixing pot, dry mix for 15s, add heated SBS modified asphalt, wet mix for 90s, Instantly.

Embodiment 2

[0047] The preparation of the anti-cracking material of the stress absorbing layer mixed with coal gasification fine slag comprises the following steps:

[0048] Step 1, weighing 23 parts of coal gasification fine slag, 18 parts of 0-3mm stone chips, 48 ​​parts of 3-5mm gravel, 10.8 parts of SBS modified asphalt, and 0.2 part of brucite mineral fiber;

[0049] Step 2, heating the 0-3mm stone chips and 3-5mm gravel at a constant temperature of 180-190°C for 4 hours, and set aside;

[0050] Step 3, heating the coal gasification fine slag at a temperature of 150-160°C for 2 hours at a constant temperature, and set aside;

[0051] Step 4, heating the SBS-modified asphalt to 170-180°C, and fully stirring evenly, and set aside;

[0052] Step 5: Put 0-3mm stone chips, 3-5mm gravel and coal gasification fine slag heated at constant temperature in the asphalt mixture mixing pot, dry mix for 15s, then add brucite mineral fiber, dry mix for 5s, and then Add heated SBS modified asphalt,...

Embodiment 3

[0054] The preparation of the anti-cracking material of the stress absorbing layer mixed with coal gasification fine slag comprises the following steps:

[0055]Step 1, weighing 26 parts of coal gasification fine slag, 16 parts of 0-3mm stone chips, 46 parts of 3-5mm gravel, 11.8 parts of SBS modified asphalt, and 0.2 part of brucite mineral fiber;

[0056] Step 2, heating the 0-3mm stone chips and 3-5mm gravel at a constant temperature of 180-190°C for 4 hours, and set aside;

[0057] Step 3, heating the coal gasification fine slag at a temperature of 150-160°C for 2 hours at a constant temperature, and set aside;

[0058] Step 4, heating the SBS-modified asphalt to 170-180°C, and fully stirring evenly, and set aside;

[0059] Step 5: Put 0-3mm stone chips, 3-5mm gravel and coal gasification fine slag heated at constant temperature in the asphalt mixture mixing pot, dry mix for 15s, then add brucite mineral fiber, dry mix for 5s, and then Add heated SBS modified asphalt, we...

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Abstract

The invention belongs to the field of asphalt pavement material preparation, and specifically discloses a stress-absorbing layer anti-cracking material mixed with coal gasification fine slag, which comprises the following materials in proportion by weight: 20-30 parts of coal gasification fine slag, 0-3mm stone chips 15-20 parts, 45-50 parts of 3-5mm gravel, 10-15 parts of SBS modified asphalt, 0-0.2 parts of brucite mineral fiber. The preparation method thereof comprises the following steps: respectively heating the 0-3mm stone chips, 3-5mm crushed stones, coal gasification fine slag and SBS modified asphalt at a constant temperature for standby; and then heating the constant-temperature heated 0-3mm stone chips , 3-5mm gravel and coal gasification fine slag are placed in the asphalt mixture mixing pot, dry-mixed for 15s, then add brucite mineral fiber, dry-mixed for 5s, then add heated SBS modified asphalt, wet-mixed for 90s, Instantly. The invention turns waste into treasure, and utilizes coal gasification fine slag for environmental protection, which is a successful model of green development.

Description

technical field [0001] The invention relates to the field of asphalt pavement material preparation, in particular to a stress-absorbing layer anti-cracking material mixed with coal gasification fine slag and a preparation method thereof, which is used between cement concrete pavement and asphalt overlay. Background technique [0002] Regardless of new asphalt pavement or old road with asphalt surface layer, reflective cracks have always been a major public hazard of asphalt pavement, and it is also a major technical problem faced by the research on the durability of asphalt pavement. The formation of reflective cracks destroys the integrity of the pavement structure and seriously affects the durability, driving comfort and aesthetics of the pavement. [0003] In order to prevent reflection cracks, in the late 1990s, the Minnesota Department of Transportation installed a low-modulus modified asphalt stress-absorbing layer between the old cement concrete pavement and the aspha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26
CPCC04B26/26C04B2111/343C04B18/065C04B14/02C04B14/46
Inventor 李祖仲何锐张荣军李文凯陈华鑫刘开平关羽汤卓群张洁华敏
Owner CHANGAN UNIV
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