Method for measuring water content of graded broken stone

A technology for grading crushed stone and moisture content, applied in measuring devices, by removing certain components, weighing, instruments, etc., it can solve the problem of large proportion of coarse aggregates, poor water retention performance of coarse aggregates, and proportion of fine aggregates. Bigger than other issues

Inactive Publication Date: 2017-02-22
SUZHOU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

When the moisture content is measured according to the requirements of the above specifications, on the one hand, due to the large void ratio of the graded crushed stone, the water retention performance of the coarse aggregate in the graded crushed stone is poor, while the water retention performance of the fine aggregate is better. The process will lead to the migration of moisture, so the moisture content measured by taking the sample from the center of the specimen cannot truly reflect the moisture content of the graded crushed stone specimen; Sampling according to the established gradation will lead to a large proportion of coarse aggregate or a large proportion of fine aggregate during sampling, so the measured moisture content cannot truly reflect the moisture content of the graded crushed stone specimen, resulting in the overall compaction The test results have a multi-hump curve, which brings uncertainty to the test results

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  • Method for measuring water content of graded broken stone
  • Method for measuring water content of graded broken stone
  • Method for measuring water content of graded broken stone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] First weigh the mass of the compaction cylinder with an inner diameter of 152mm to be 3250.0g, then select the graded crushed stone sample to be tested with 3.0% estimated moisture content, and charge according to the three-layer method, and compact each layer 98 times . After the compaction is completed, use a repair knife to scrape the surface of the graded gravel along the edge of the compaction cylinder. Finally, the total mass of the compaction cylinder and the sample in the cylinder was weighed to be 8211.4g, and the mass of the graded crushed stone to be tested was 4961.4g.

[0058] Use a bulldozer to push out the graded crushed stone specimens in the compaction cylinder, put them into a shallow pan and crush them, and use the quartering method to quickly divide them into four parts, which are numbered 1, 2, 3 and 4 respectively, and measure the corresponding numbered crushed stones The sample masses are: 1065.3g, 1125.8g, 1358.7g and 1411.6g respectively.

[0...

Embodiment 2

[0063] First weigh the mass of the compaction cylinder with an inner diameter of 152mm to be 3250.0g, then select the graded crushed stone sample to be tested with 3.5% estimated moisture content, and charge according to the three-layer method, and compact each layer 98 times . After the compaction is completed, use a repair knife to scrape the surface of the graded gravel along the edge of the compaction cylinder. Finally, the total mass of the compaction cylinder and the sample in the cylinder was weighed to be 8251.3g, and the mass of the graded crushed stone to be tested was 5001.3g.

[0064] Use a bulldozer to push out the graded crushed stone specimens in the compaction cylinder, put them into a shallow pan and crush them, and use the quartering method to quickly divide them into four parts, which are numbered 1, 2, 3 and 4 respectively, and measure the corresponding numbered crushed stones The sample masses are: 1265.3g, 1232.3g, 1320.7g and 1183.0g respectively.

[0...

Embodiment 3

[0069] First weigh the mass of the compaction cylinder with an inner diameter of 152mm to be 3250.0g, then select the graded crushed stone sample to be tested with 4.0% estimated moisture content, and charge according to the three-layer method, and compact each layer 98 times . After the compaction is completed, use a repair knife to scrape the surface of the graded gravel along the edge of the compaction cylinder. Finally, the total mass of the compaction cylinder and the sample in the cylinder was weighed to be 8306.4g, and the mass of the graded crushed stone to be tested was 5056.4g.

[0070] Use a bulldozer to push out the graded crushed stone specimens in the compaction cylinder, put them into a shallow pan and crush them, and use the quartering method to quickly divide them into four parts, which are numbered 1, 2, 3 and 4 respectively, and measure the corresponding numbered crushed stones The sample masses are: 1362.3g, 1209.6g, 1196.5g and 1288.0g respectively.

[0...

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Abstract

The invention provides a method for measuring the water content of graded broken stone and belongs to the field of graded broken stone materials and construction parameter testing. The method includes: using the mass proportion, accounting for the to-be-measured graded broken stone, of each broken sample as weight to calculate the weighted average of the water content of different drying broken samples, and using the calculation result as the water content of the to-be-measured graded broken stone. The method has the advantages that the defects that due to the fact that the graded broken stone is high in porosity, free of cohesiveness and poor in water retention capacity, water migrates, water content measuring by sampling a central point is not representative, coarse aggregate or fine aggregate is high in proportion during graded broken stone sampling, and the measured water content cannot truly reflect the water content of compaction test samples due to little sampling or sampling unevenness degree, and the compaction test result has a multi-camel-back curve are overcome, the accuracy and reliability of the measuring result are increased, and the method is simple and fast.

Description

technical field [0001] The invention relates to the field of graded crushed stone materials and construction parameter testing, in particular to a method for measuring the water content of graded crushed stones. Background technique [0002] As a flexible base material, graded crushed stone is prepared from aggregates of different particle sizes according to the gradation requirements and a certain mass ratio, and is widely used in the field of road engineering. The maximum dry density and optimum water content are the most basic parameters for performance testing and construction of graded crushed stone, and the test of dry density is closely related to the test of water content, so the test of water content is the basic material parameter test of graded crushed stone key. [0003] At present, the test of the optimum water content and maximum dry density of graded crushed stone is mainly based on the compaction test method in JTGE40-2007 of the "Highway Soil Test Regulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/045
Inventor 高启聚苏东兰沈菊男马晓尧
Owner SUZHOU UNIV OF SCI & TECH
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