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
CN107219151AInactive Publication Date: 2017-09-29CHANGAN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGAN UNIV
Publication Date
2017-09-29
Estimated Expiration
Not applicable · inactive patent

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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.
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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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