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Test method for measuring maximum dry density of soil and stone mixture of road subgrade

A technology of maximum dry density and test method, which is applied in the preparation of test samples, measuring devices, specific gravity measurement, etc., can solve the problems such as difficult to accurately measure the height of the test piece, the surface of the test piece is difficult to flatten, and the moisture content of the material changes greatly. Effect of increasing indoor standard density, reliable results, and increasing compaction requirements

Inactive Publication Date: 2017-09-29
CHANGAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compaction hammer often smashes the soil with larger particle size, which changes the particle distribution characteristics of the test material, resulting in distortion of the test results; compared with the on-site vibratory rolling, the compaction process is slow, resulting in a large change in the moisture content of the material before and after the test The most serious thing is that during the heavy compaction process, due to the existence of many large-sized gravels in each layer of the soil-rock mixture, it is difficult to flatten the surface of the test piece, and it is difficult to accurately measure the height of the test piece

Method used

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  • Test method for measuring maximum dry density of soil and stone mixture of road subgrade
  • Test method for measuring maximum dry density of soil and stone mixture of road subgrade
  • Test method for measuring maximum dry density of soil and stone mixture of road subgrade

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Embodiment 1

[0043] Embodiment 1 (soil-rock ratio is 60:40)

[0044] The test method of the maximum dry density of the mensuration roadbed soil-rock mixture of the present embodiment is carried out through the following steps:

[0045] Step 1: Take out a sufficient amount of soil-rock mixture from the pile pulled back from the construction site, place it on several medium-sized iron pans, and then place it in an oven for heating and drying. The temperature of the oven is set at 105 ℃, drying for 6 hours;

[0046] Step 2, take out the iron box containing the dried test materials from the oven, and put it in the open space of the laboratory to cool down for 30 minutes; pour the soil-rock mixture into the material sieve corresponding to the sieve holes of 0-60mm After adding an appropriate amount of soil and stone, cover the sieve cover and place it on a shaker for sieving; after vibrating for about 10 to 15 minutes, remove the sieve from the shaker to remove particles with a size above 40mm...

Embodiment 2

[0060] Embodiment 2 (soil-rock ratio is 50:50)

[0061] The test method of the maximum dry density of the mensuration roadbed soil-rock mixture of the present embodiment is carried out through the following steps:

[0062] Step 1: Take out a sufficient amount of soil-rock mixture from the pile pulled back from the construction site, place it on several medium-sized iron pans, and then place it in an oven for heating and drying. The temperature of the oven is set at 105 ℃, drying for 6 hours;

[0063] Step 2, take out the iron box containing the dried test materials from the oven, and put it in the open space of the laboratory to cool down for 30 minutes; pour the soil-rock mixture into the material sieve corresponding to the sieve holes of 0-60mm After adding an appropriate amount of soil and stone, cover the sieve cover and place it on a shaker for sieving; after vibrating for about 10 to 15 minutes, remove the sieve from the shaker to remove particles with a size above 40mm...

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Abstract

The invention discloses a test method for measuring maximum dry density of soil and stone mixture of a road subgrade. The test method comprises the following steps of loading samples into a test die by two times, fixing onto a vibration compaction test instrument, and performing vibration compaction for two times, wherein the vibration compaction time is 50s each time, the parameter setting of the compaction test instrument is as follows: the vibration frequency is 25Hz, the excitation vibration force is 5.5kN, the nominal vibration amplitude is 1.4mm, the loading mass is 110+ / -2kg, the unloading mass is 170+ / -2kg, the eccentric block included angle is 0 degree, and the pressure of the static surface is 109kPa; testing the water content of each sample, and calculating the dry density of each sample; repeating the compaction test for five times, and drawing the dry density-water content relationship curve, wherein the transverse coordinate is the water content, and the longitudinal coordinate is the dry density; the dry density corresponding to the curve peak is the maximum dry density roudmax, and the corresponding water content is optimum water content omega0. The test method has the advantages that the operation is simple and convenient, the results are reliable, the variance is small, and the destroy to the raw materials is small.

Description

【Technical field】 [0001] The invention is applied in the field of road engineering, and relates to a method for determining the optimum moisture content and maximum dry density of soil-rock mixtures that simulate the on-site vibrating and rolling characteristics of heavy-duty road rollers, in particular to a test method for measuring the maximum dry density of roadbed soil-rock mixtures. 【Background technique】 [0002] There are many mountains and hills in the eastern and central and western regions of my country. Earth and rock excavation is often encountered in the construction of roads in these areas. Based on the principle of adapting measures to local conditions and using local materials, earth and rock mixtures are widely used in the process of roadbed construction. In order to control the compaction quality of soil-rock mixture subgrade, it is necessary to measure its maximum dry density and optimum water content indoors. The soil-rock mixed subgrade is built by soil-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/02G01N9/36G01N1/28G01N1/44G01N1/36
CPCG01N1/286G01N1/36G01N1/44G01N9/02G01N9/36G01N2001/366G01N2009/024
Inventor 纪小平李寿伟李坚强陈浙江熊越蒋应军王阳阳吴云飞
Owner CHANGAN UNIV
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