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Methods for gradating and inspecting coarse aggregate for asphalt concrete

A technology of asphalt concrete and coarse aggregate, applied in the direction of chemical instruments and methods, clay preparation equipment, mixing operation control, etc., to achieve the effect of saving money

Active Publication Date: 2005-02-23
沙庆林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coarse aggregate fractured graded asphalt concrete does not necessarily have a dense skeleton structure.

Method used

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  • Methods for gradating and inspecting coarse aggregate for asphalt concrete
  • Methods for gradating and inspecting coarse aggregate for asphalt concrete
  • Methods for gradating and inspecting coarse aggregate for asphalt concrete

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Embodiment Construction

[0039] The coarse aggregate broken grading asphalt concrete aggregate grading method of the present invention specifically comprises the following steps:

[0040] (1) Determining the mineral aggregate grading curve of coarse aggregate broken-graded asphalt concrete:

[0041] (1) Divide the aggregate into three parts, that is, the actual maximum particle size ~ 4.75mm is coarse aggregate, 4.75mm ~ 0.075mm is fine aggregate, < 0.075mm is filler;

[0042] (2) Sieve the coarse aggregate according to the nominal maximum particle size: take SAC30 as an example, sieve the coarse aggregate gravel, and divide it into particle sizes of 37.5mm~31.5mm, 31.5mm~26.5mm, 26.5mm~19mm, 19mm~16mm, 16mm~13.2mm, 13.2mm~9.5mm, 9.5mm~4.75mm seven coarse aggregates for use; if it is SAC16, only the latter four grades of coarse aggregate are required; if it is SAC10 , then only the last two grades of coarse aggregate are required;

[0043] (3) Sieve fine aggregate: sieve the fine aggregate stone int...

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Abstract

A method for grading the mineral materials and coarse aggregate to prepare the compact asphalt concrete used for the surface layer of external wall and a method for testing said asphalt concrete are disclosed. Said asphalt concrete features low porosity, and high resistance to water destroy and high-temp deformation.

Description

technical field [0001] The invention relates to a coarse aggregate discontinuously graded asphalt concrete, an ore material grading method for asphalt concrete containing more gravel (SAC) and a testing method thereof. Background technique [0002] Asphalt concrete has been widely used in road construction in various countries. Asphalt concrete is used in the pavement surface of about 90% of highways in my country. The asphalt concrete used in various countries in the world can be roughly divided into two categories: one is dense asphalt concrete, and its porosity (or air rate) V a Less than 5%, so the water permeability is small. The other is porous asphalt concrete, whose porosity is often above 18%, and the maximum reaches 28%, and is often used as a wear layer. Related to the present invention is dense asphalt concrete, which is divided into traditional continuous dense gradation asphalt concrete, coarse aggregate discontinuous gradation asphalt concrete and fine aggr...

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Application Information

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IPC IPC(8): B28C7/00B28C7/04
Inventor 沙庆林
Owner 沙庆林