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Novel road base structure

A technology for road base and base, which is applied in the direction of roads, roads, and on-site coagulation pavement, etc., can solve the problems of surface cracking, increased bending moment of asphalt surface, increased tensile stress and tensile strain, etc. The effect of reducing the occurrence of cracks, reducing tensile stress and strain, and reducing susceptibility

Pending Publication Date: 2020-05-12
SHANDONG JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the composite base course using asphalt macadam and graded macadam, the increase of the bending moment of the asphalt pavement is likely to cause the increase of the tensile stress and strain at the bottom of the asphalt pavement, which in turn leads to cracking of the pavement.

Method used

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Examples

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example 1

[0009] Example 1: The strength of the designed composite base is 6.0MPa. The upper base 3 is waste rubber modified cement stabilized gravel with a thickness of 20cm. The lower base 4 is cement stabilized gravel. The thickness of the upper base 3 is 20cm. , the mineral mix ratio is: 10-30mm crushed stone, 10-20mm crushed stone, 5-10mm crushed stone, stone salt, and waste rubber powder are composed of 25%, 27%, 25%, 17%, and 6%; Waste rubber powder is 40 mesh, and waste rubber powder replaces part of the petite; cement is added at a dose of 8% of the total weight of the mineral material, and the cement type and strength grade are ordinary portland cement of 42.5; the lower base 4 is by weight percentage, ore The material mix ratio is: 10-30mm crushed stone, 10-20mm crushed stone, 5-10mm crushed stone, and stone salt are composed of 25%, 27%, 25%, and 23%; Dosage of cement, cement type and ordinary Portland cement of strength grade 42.5, the thickness of the subbase is 15-25cm. ...

example 2

[0010] Example 2: Design a kind of composite base strength to be 7.0MPa, wherein upper base 3 is waste rubber modified cement stabilized gravel, thickness is 20cm, lower base 4 is cement stabilized gravel, thickness is 20cm, upper base is by weight percentage : 10-30mm crushed stone, 10-20mm crushed stone, 5-10mm crushed stone, stone salt, and waste rubber powder are composed of 25%, 27%, 25%, 19%, and 4%; the particle size of waste rubber powder is 40 mesh, waste rubber powder replaces part of the salt; add cement at a dose of 9% of the total weight of the mineral material, and the cement type and strength grade are ordinary Portland cement of 42.5; the lower base 4 is by weight percentage, and the mineral material mix ratio is : 10-30mm crushed stones, 10-20mm crushed stones, 5-10mm crushed stones, and stone salt are composed of 25%, 27%, 25%, and 23%; the cement dosage is 5.5%, and the cement type and strength grade are 42.5 of ordinary Portland cement.

example 3

[0011] Example 3: The strength of a composite base is designed to be 8.0MPa, wherein the upper base 3 is waste rubber modified cement stabilized gravel with a thickness of 20cm, the lower base 4 is cement stabilized gravel with a thickness of 20cm, and the upper base 3 is by weight percentage It is: 10-30mm crushed stone, 10-20mm crushed stone, 5-10mm crushed stone, stone salt, and waste rubber powder. The composition ratios are 25%, 27%, 25%, 21%, and 2%; Add cement at 10% of the dose, the cement type and ordinary Portland cement with a strength grade of 42.5; the lower base 4 is based on weight percentage, and the mineral mix ratio is: 10-30mm crushed stone, 10-20mm crushed stone, 5-10mm The proportions of gravel and salt are 25%, 27%, 25%, and 23%; cement is added at a dose of 6% of the total weight of the mineral material, and the cement type and strength grade are ordinary Portland cement of 42.5.

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Abstract

The invention relates to a novel road base structure, which comprises an upper base layer (3) and a lower base layer (4) and is characterized in that the strength of the base layers is 6.0 to 9.0 MPa;the upper base layer (3) is waste rubber modified cement stabilized macadam; the lower base layer (4) is cement stabilized macadam; the upper base layer (3) is prepared from the following mineral aggregate (by weight): 15%-25% of 10-30 mm macadam, 20%-27% of 10-20 mm macadam, 15%-25% of 5-10 mm macadam, 17%-21% of stone nitrate and 2%-12% of waste rubber powder, wherein cement is added in an amount which is 5-10 percent of the total weight of the mineral aggregate, and the thickness of the upper base layer (3) is 15-25cm; and the lower base layer (4) is prepared from the following mineral aggregate (by weight): 15%-25% of 10-30 mm broken stone, 20%-27% of 10-20 mm broken stone, 15%-25% of 5-10 mm broken stone and 23%-33% of mirabilite, wherein cement is added according to the dosage of 5-7% of the total weight of the mineral aggregate, and the thickness of the lower base layer (4) is 15-25 cm. The structure can reduce the tensile stress and tensile strain of the bottom of the asphaltsurface layer, reduce the sensitivity to wheels, reduce reflection cracks caused by cracking of the lower base layer and reduce cracks of the asphalt surface layer.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a novel road base structure. Background technique [0002] The road includes asphalt surface layer, transition layer, upper base, lower base, subbase and soil base. Usually, we call upper base and lower base as base. The upper base layer or the lower base layer are sometimes composed of the same material, and sometimes are composed of different materials. The upper base layer or the lower base layer is composed of different materials as a composite base layer. The upper part of the composite base is soft and the lower part is rigid, which is an inverted structure and is the development trend of the road base. Common composite bases mainly include asphalt macadam and semi-rigid base, and graded macadam and semi-rigid base. In the above two forms of composite base, asphalt macadam and graded macadam are both stress-absorbing layers, which mainly absorb the u...

Claims

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Application Information

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IPC IPC(8): C04B28/04E01C3/04E01C7/18
CPCC04B28/04E01C3/04E01C7/18C04B2111/00612C04B2111/0075C04B18/12C04B18/22
Inventor 王可良刘刚范圣伟刘玲隋同波李淑媛徐静胡秀颖谭旭翔王涛
Owner SHANDONG JIAOTONG UNIV
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