Cement-stabilizing broken stone used for highway subgrade

A cement-stabilized crushed stone and cement technology, applied in roads, roads, buildings, etc., can solve the problem of inability to ensure accurate metering and uniform mixing of admixtures, and the duration is generally about 2 to 3 hours, sometimes even 4 to 5 hours, etc. problems, achieve significant economic and social benefits, and reduce environmental load

Inactive Publication Date: 2013-12-25
SHANGHAI ERSHIYE CONSTR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the cement-stabilized gravel takes a long time from mixing and discharging, transportation to final rolling and forming, generally about 2 to 3 hours, sometimes even 4 to 5 hours; in order to ensure the construction, the cement setting time is required to be longer. It is more than 3 hours, and the final setting time is more than 6 hours, while the initial setting and final setting time of conventionally used cement are generally 2 to 3 hours; if the addition of retarding admixture is considered, the amount of cement is only 4 to 5%. , the amount of admixture will be very small, so that the accurate measurement and uniform mixing of the admixture cannot be guaranteed in production.

Method used

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  • Cement-stabilizing broken stone used for highway subgrade

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Effect test

Embodiment 1

[0020] A cement-stabilized crushed stone for highway subgrade using waste slag, which is composed of 4.0% by weight of clinker-free steel slag cement with a strength grade of 32.5, 30% by weight of recycled aggregate, 70% by weight of natural aggregate, and the balance of water, stirring and mixing made. The processing steps are as follows: first add the required amount of aggregate and mix, then add clinker-free steel slag cement in the form of external addition, and finally add water and mix together. The aggregate gradation and dosage used are shown in Table 1.

[0021] Table 1 Aggregate grading and dosage

[0022] aggregate grading

[0023] Using recycled 30% by weight aggregate, it is used to replace part of the amount of natural aggregate of the same particle size.

Embodiment 2

[0025] A cement-stabilized crushed stone for highway subgrade using waste slag, which is composed of 4.5% by weight of clinker-free steel slag cement with a strength grade of 32.5, 30% by weight of recycled aggregate, 70% by weight of natural aggregate, and the balance of water, stirring and mixing made.

Embodiment 3

[0027] A cement-stabilized crushed stone for highway subgrade using waste slag, which is composed of 5.0% by weight of clinker-free steel slag cement with a strength grade of 32.5, 30% by weight of recycled aggregate, 70% by weight of natural aggregate, and the balance of water, stirring and mixing made.

[0028] Under ambient temperature conditions, the dry density, ash content and strength requirements of the final prepared cement-stabilized macadam for highway subgrades shall be controlled according to the following table:

[0029]

[0030] By adjusting the different dosages and proportions of these two materials and natural gravel, the 7-day unconfined compressive strength of cement-stabilized gravel for highway subgrades can actually reach more than 4.5Mpa, which can meet the requirements of high-grade highways and is suitable for Used in the construction of urban roads.

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Abstract

The invention relates to a cement-stabilizing broken stone used for highway subgrade, which comprises the following ingredients in weight percent: 4.0%-5.0% of clinker-free slag cement, 90%-92% of aggregate and the balance of water. The cement-stabilizing broken stone has the advantages of ensuring sufficient construction time, developing a new resource, lightening the environmental capacity, changing the waste materials into things of value, and obtaining remarkable economical benefits and social benefits.

Description

technical field [0001] The invention relates to a highway subgrade material, in particular to a cement-stabilized crushed stone for highway subgrades, which is made from iron and steel industrial waste and concrete waste blocks as main raw materials. Background technique [0002] Cement-stabilized gravel used in road construction is a roadbed material mixed with cement, gravel and water in a certain proportion. As the main structure of the road base, cement-stabilized macadam has the advantages of high strength, strong integrity, and good durability, making it popularized and applied. In recent years, the steel industry and construction industry have produced more steel slag and concrete waste blocks, which can have certain properties after treatment, so that they can play a role in engineering materials; the use of waste slag in road construction is an important development at present direction. Steel slag can be processed to produce clinker-free steel slag cement, while ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/00C04B28/00
Inventor 李丽霞
Owner SHANGHAI ERSHIYE CONSTR CO LTD
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