Anti-cracking mixture for cement-stabilized bases of roads in alpine high-altitude regions

A mixture and base layer technology, applied in the field of water-stabilized base layer anti-crack mixture and anti-crack mixture in alpine and high-altitude areas, can solve the problems of semi-rigid base layer cracking and reflection cracks, reduce the number of reflection cracks, and achieve suitable gradation. , the effect of improving the bearing capacity

Active Publication Date: 2017-01-04
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the problems of semi-rigid base cracking and reflective crack formation in the prior art, and to provide a water-stabilized base mix for alpine and high-altitude regions

Method used

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  • Anti-cracking mixture for cement-stabilized bases of roads in alpine high-altitude regions
  • Anti-cracking mixture for cement-stabilized bases of roads in alpine high-altitude regions
  • Anti-cracking mixture for cement-stabilized bases of roads in alpine high-altitude regions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare the water-stabilized base compound, wherein the weight percent range of each component is as follows: crushed stone 75%, natural sand 10%, cement 5%, sodium sulfate 6%, solid aluminum sulfate 4%, raw materials are stirred and mixed, After mixing evenly, prepare a test block for testing.

[0043] Firstly, the compaction test of cement-stabilized macadam (T 0804-1994) is carried out to determine the maximum dry density and optimal water content of cement-stabilized macadam under the material ratio. According to the results of the compaction test, a cylindrical specimen (T0843-2009) of φ150×150mm and a central beam specimen of 100mm×100mm×400mm (T 0844-2009) were formed. The 7-day unconfined compressive strength test (T 0805-1994) and the 7-day split test (T 0806-1994) were carried out using cylindrical specimens, and the temperature shrinkage test (T 0854-2009) and Dry shrinkage test (T 0855-2009), the test results are shown in Table 2.

[0044] Embodiment 1 is ...

Embodiment 2

[0046] Prepare the water-stabilized base compound, wherein the weight percent range of each component is as follows: crushed stone 85%, natural sand 5%, cement 3%, sodium sulfate 5%, solid aluminum sulfate 2%, raw materials are stirred and mixed, After mixing evenly, prepare a test block for testing.

[0047] Firstly, the compaction test of cement-stabilized macadam (T 0804-1994) is carried out to determine the maximum dry density and optimal water content of cement-stabilized macadam under the material ratio. According to the results of the compaction test, a cylindrical specimen (T0843-2009) of φ150×150mm and a central beam specimen of 100mm×100mm×400mm (T 0844-2009) were formed. The 7-day unconfined compressive strength test (T 0805-1994) and the 7-day split test (T 0806-1994) were carried out using cylindrical specimens, and the temperature shrinkage test (T 0854-2009) and Drying shrinkage test (T 0855-2009), fatigue life test, test results are shown in Table 2.

[0048]...

Embodiment 3

[0050] Prepare the water-stabilized base compound, wherein the weight percentage range of each component is as follows: 80% of crushed stone, 8% of natural sand, 3% of cement, 7% of sodium sulfate, 2% of solid aluminum sulfate, the raw materials are stirred and mixed, After mixing evenly, prepare a test block for testing.

[0051] Firstly, the compaction test of cement-stabilized macadam (T 0804-1994) is carried out to determine the maximum dry density and optimal water content of cement-stabilized macadam under the material ratio. According to the results of the compaction test, a cylindrical specimen (T0843-2009) of φ150×150mm and a central beam specimen of 100mm×100mm×400mm (T 0844-2009) were formed. The 7-day unconfined compressive strength test (T 0805-1994) and the 7-day split test (T 0806-1994) were carried out using cylindrical specimens, and the temperature shrinkage test (T 0854-2009) and Drying shrinkage test (T 0855-2009), fatigue life test, test results are shown...

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Abstract

The invention discloses a mixture for cement-stabilized bases, and particularly relates to an anti-cracking mixture for cement-stabilized bases of roads in alpine high-altitude regions, which consists of the following components in percentage by weight: 75 to 85 percent of aggregate, 5 to 10 percent of natural sand, 3 to 6 percent of cement, 5 to 10 percent of anhydrous sodium sulphate and 1.5 to 4 percent of aluminum sulfate; and the aggregate is characterized in that the aggregate crushing value is not greater than 28 percent, the flat and elongated particle content is not higher than 15 percent, and the plasticity index of the aggregate less than 0.6mm is less than 4 percent. The mixture for cement-stabilized bases which is disclosed by the invention is designed according to the alpine high-altitude characteristics, the average temperature shrinkage coefficient and the average dry shrinkage coefficient are effectively decreased, moreover, the requirement on the compressive strength, splitting strength and fatigue properties of the mixture can be met, the mixture can help to prevent the problem of the cracking of cement-stabilized bases in alpine high-altitude regions, the effect of reducing the number of reflection cracks of pavements in alpine high-altitude regions is remarkable, and the mixture is applicable to the construction of road bases in the Tibetan plateau region of China.

Description

technical field [0001] The invention belongs to the technical field of highway engineering, and relates to an anti-cracking mixture, in particular to an anti-cracking mixture for water-stabilizing base courses in high-cold and high-altitude regions. Background technique [0002] The semi-rigid base, represented by the cement-stabilized gravel base, has the characteristics of strong board and excellent mechanical properties. The water-stabilized gravel base has rich raw materials, low engineering cost, and can improve the strength and bearing capacity of the pavement structure, making it irreplaceable superiority over other pavement structures. [0003] Thermal expansion and contraction are common physical properties of materials. The properties of semi-rigid base materials and asphalt pavement materials are inevitably affected by environmental factors. Under certain conditions, base cracks are inevitable. The hazards caused by shrinkage cracks are as follows: 1) The infiltr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B22/14
CPCC04B28/00C04B2111/0075C04B2201/50C04B14/06C04B14/28C04B22/148C04B22/147
Inventor 韩森胡祥陶良
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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