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Graded broken stone tabular specimen wheel mill molding method and its density measuring method

A technology of grading crushed stones and forming methods, which is applied in the direction of measuring devices, specific gravity measurement, and preparation of test samples, etc., and can solve the problems of no test method and no density test method, etc.

Inactive Publication Date: 2012-07-04
CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For 450mm long, 300mm wide, 100mm thick or similar larger size graded crushed stone plate specimens, there is no suitable test method at present
In addition, there is no suitable density test method for the graded crushed stone plate specimen formed by wheel grinding.

Method used

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  • Graded broken stone tabular specimen wheel mill molding method and its density measuring method
  • Graded broken stone tabular specimen wheel mill molding method and its density measuring method
  • Graded broken stone tabular specimen wheel mill molding method and its density measuring method

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Embodiment Construction

[0046]Preferred embodiments of the present invention will be described in detail below.

[0047] The wheel milling method for the graded crushed stone slab-shaped test piece of the present embodiment comprises the following steps:

[0048] 1) Dry the aggregates of each grade of graded crushed stone;

[0049] 2) Configure the graded crushed stone mixture according to the ratio, mix it well and stuff it for 12h~24h for later use;

[0050] 3) Install the test mold frame on the test mold. Take the preparation of a 450mm, 300mm wide, and 100mm thick graded crushed stone plate-shaped test piece as an example. The test mold is made of high carbon steel or tool steel. The internal dimensions of the test mold It is 450mm long, 300mm wide, and 100mm high. The test mold frame is a steel square frame, and its inner wall is 450mm long, 300mm wide, and 50mm high. Put it on the trial mold; pour the graded crushed stone mixture obtained in step 12) into the flat bottom basin, mix the graded...

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Abstract

The invention provides a graded broken stone tabular specimen wheel mill molding method, including the following steps: 1) drying each file of aggregate of graded broken stones; 2) configuring the graded broken stone mixture according to the proportioning, mixing uniformly and covering the material tightly for 12h - 24h, standby; 3) mounting a specimen mold frame on the specimen mold, pouring thegraded broken stone mixture obtained from the step 2) in a flat-bottomed basin, evenly mixing the graded broken stone mixture in the flat-bottomed basin, loading specimen mold around in sequence fromedge to the center, the thickness of the broken stone mixture in the middle of specimen mold is slightly greater than the thickness of four edges; 4) removing the specimen mold frame, tamping one timethe graded broken stone mixture in the specimen mold from edge to center, leveling into a gibbosity arc; 5) placing the specimen mold filled with graded broken stone mixture at the wheel mill platform of the roller, starting up the roller to performing rolling until the dry density of the specimen after rolling achieves the required compactness, to obtained the graded broken stone tabular specimen. The invention also provides a method for measuring density of the graded broken stone tabular specimen prepared by the graded broken stone tabular specimen wheel mill molding method.

Description

technical field [0001] The invention relates to the technical field of highway engineering, and specifically relates to a method for preparing a graded crushed stone plate-shaped test piece. Background technique [0002] Graded crushed stone is used as the pavement base or subbase. Before the surface layer is constructed, it needs to bear the direct driving load of the construction vehicle, so it should have strong anti-loosening and anti-deformation properties; after the surface layer is constructed, it can be used as the base or subbase. , it needs to withstand the stress of the driving load transmitted to the base or subbase through the surface layer, so it should have high strength and deformation resistance, so it is necessary to test and evaluate the performance of graded crushed stone. [0003] The test evaluation of the performance of graded crushed stone requires the preparation of graded crushed stone specimens. At present, the production of small-scale test pieces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N9/02
Inventor 周刚陈天泉常文周进川谭巍
Owner CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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