Ultra-thick wide cement stabilized macadam base construction process

A cement-stabilized crushed stone and construction technology technology, which is applied in the direction of roads, road repairs, on-site paved coagulation pavements, etc., can solve the problems of unfavorable crushed stone base overall strength, base bearing capacity decline, and affecting the base overall strength, etc. Achieve the effects of improving impermeability and compactness, improving overall strength and promoting contact

Active Publication Date: 2021-06-11
CHENGDU JIANGONG ROAD & BRIDGE CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing base construction technology, the demand for the thickness of the base is increased. The overall paving will lead to more pores in the lower base, and the difference in density between the upper part and the lower part of the base is large, resulting in dense top and sparse bottom, which is not conducive to the cement-stabilized gravel base. Overall strength; it is necessary to pave the base layer in two or more layers. Layered and stepped construction and rolling methods are generally used. When laying the upper layer, it is easy to cause damage to the lower layer of the paved base layer, resulting in the gap between the upper and lower layers of the base layer. The decline in bearing capacity affects the overall strength of the base

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) mixing: get cement, aggregate, mixing water and mix, carry out mixing, make the first mixing material and the second mixing material, the moisture content of the first mixing material is higher than the moisture content of the second mixing material by 2 %;

[0035] (2) Paving:

[0036] (2.1) One-time paving: the water-absorbing agent is sprayed on the road surface to be paved, and a cushion is arranged on the road surface, and the consumption of the water agent is 0.3kg / m 2 , use a 20t road roller for static pressure, take the first mixture for paving, and lay the first layer of cement stabilized gravel base;

[0037] (2.2) Primary compaction: use a 20t road roller for static pressure, the number of times of static pressure is 2, and the rolling speed is 25m / min; use a 32t vibratory road roller for vibration compaction, after weak vibration once, strong vibration once, and rolling The pressing speed is 60m / min, and the water agent is sprayed on the upper surface ...

Embodiment 2

[0047] (1) Mixing: Get cement, aggregate, mixing water and mix, carry out mixing, make the first mixing material and the second mixing material, the moisture content of the first mixing material is higher than the moisture content of the second mixing material by 2 %;

[0048] (2) Paving:

[0049] (2.1) One-time paving: the water-absorbing agent is sprayed on the road surface to be paved, and a cushion is arranged on the road surface, and the consumption of the water agent is 0.3kg / m 2 , using a 20t road roller for static pressure, taking the first mixture for paving, and paving to form the first layer of cement-stabilized gravel base;

[0050] (2.2) Primary compaction: use a 20t road roller for static pressure, the number of times of static pressure is 2, and the rolling speed is 25m / min; use a 32t vibratory road roller for vibration compaction, after weak vibration once, strong vibration once, rolling The pressing speed is 60m / min, and the water agent is sprayed on the upp...

Embodiment 3

[0060] (1) Mixing: Get cement, aggregate, mixing water and mix, carry out mixing, make the first mixing material and the second mixing material, the moisture content of the first mixing material is higher than the moisture content of the second mixing material by 2 %;

[0061] (2) Paving:

[0062] (2.1) One-time paving: the water-absorbing agent is sprayed on the road surface to be paved, and a cushion is arranged on the road surface, and the consumption of the water agent is 0.3kg / m 2 , using a 20t road roller for static pressure, taking the first mixture for paving, and paving to form the first layer of cement-stabilized gravel base;

[0063] (2.2) Primary compaction: use a 20t road roller for static pressure, the number of times of static pressure is 2, and the rolling speed is 25m / min; use a 32t vibratory road roller for vibration compaction, after weak vibration once, strong vibration once, rolling The pressing speed is 60m / min, and the water agent is sprayed on the upp...

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PUM

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Abstract

The invention discloses an ultra-thick wide cement stabilized macadam base construction process which comprises the following steps of mixing: mixing cement, aggregate and mixing water, and mixing to obtain a first mixture and a second mixture, (2) paving: paving the first mixture to form a first cement stabilized macadam base layer, spraying an aqueous solution on the first cement stabilized macadam base layer, and paving the second mixture on the upper surface of the first cement stabilized macadam base layer to form a second cement stabilized macadam base layer. The water aqua added between the upper part and the lower part of the cement stabilized macadam base is adsorbed on the upper surface of the lower part to generate a suspension stabilizing effect, reduce surface tension, accelerate wetting and permeation of water to a mixture, dissolution of calcium oxide in the mixture and surface thickening of the mixture, so that a coagulation accelerating effect is achieved, and the initial strength of the upper surface of the lower part is relatively high; and during the compaction process, the influence of vibration on the base layer structure can be relieved, and the overall strength of the manufactured base layer is improved.

Description

technical field [0001] The invention relates to the technical field of cement construction, in particular to a super-thick and wide-width cement-stabilized gravel base construction technology. Background technique [0002] Cement is a powdery hydraulic inorganic gelling material, which forms a slurry after being stirred with water, and can firmly bond sand, stone and other materials together after hardening, while cement-stabilized gravel is cement and graded crushed Stone blending, paving and compaction, embedding and locking, the layer structure formed is suitable as the base material of high-grade pavement. However, in the existing base construction technology, the demand for the thickness of the base is increased. The overall paving will lead to more pores in the lower base, and the difference in density between the upper part and the lower part of the base is large, resulting in dense top and sparse bottom, which is not conducive to the stability of cement-stabilized gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/14E01C11/00E01C19/23E01C19/28C04B41/64C04B40/02C04B40/04
CPCE01C7/14E01C7/142E01C11/00E01C19/23E01C19/28C04B41/64C04B41/4961C04B40/029C04B40/04C04B41/4927C04B41/466C04B41/46C04B41/4535C04B28/04C04B28/08C04B28/021Y02A30/60
Inventor 闫相明周丽闫辉
Owner CHENGDU JIANGONG ROAD & BRIDGE CONSTR
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