Graded crushed stones for flexible base of highway pavement and preparation method of graded crushed stones

Abstract

The invention provides graded crushed stones for a flexible base of a highway pavement and a preparation method of the graded crushed stones. The mother rock of the graded crushed stones is regional metamorphic rock in lithology, and develops in the form of a structure of schistosity and gneiss. The graded crushed stones comprise different grades of graded crushed stones which pass through different sizes of mesh holes, wherein the crushed stone particles at a proximate grade are stuffed in gaps between the crushed stone particles at the current grade, and the gaps between the crushed stone particles at the proximate grade are stuffed with crushed stone particles at a grade below the proximate grade, and the rest can be done in the same manner until the crushed stone particles at the smallest grade are stuffed in the gaps between the crushed stone particles at a grade above the smallest grade. Through the adoption of the graded crushed stones disclosed by the invention, the regional metamorphic rock can be used as a mother rock material of the graded crushed stones and is applied to the flexible base of the highway pavement; for a region where the mother rock is mainly the regionalmetamorphic rock in the lithology, measures can be taken to suit local conditions, and raw materials can be obtained locally, so that costs are greatly saved, the construction efficiency is improved,and reflection cracks can be effectively controlled.

Description

technical field [0001] The invention relates to the field of highway pavement engineering, in particular to a graded crushed stone for a flexible base course of a highway pavement and a preparation method thereof. Background technique [0002] Crushed stone is the most important material in graded crushed stone raw materials. The specification stipulates that the crushing value of crushed stone shall not exceed 30%, and the content of slender and flat particles in the mixture shall not exceed 20%, and it does not contain clay lumps and other harmful substances. substance. The maximum diameter of all components in the graded crushed stone shall not exceed 37.5mm, the plasticity index of the graded crushed stone shall be less than 9, and the liquid limit shall be less than 28%. [0003] Among all graded crushed stone materials, limestone is the best rock quality. The fine particles of limestone have a high content of carbonate, which can cement the coarse aggregate after mixi...

AI Technical Summary

Problems solved by technology

[0003] Among all graded crushed stone materials, limestone is the best rock quality. The fine particles of limestone have a high content of carbonate, which can cement the coarse aggregate after mixing and reacting with water. and it is easy to be rolled and formed to meet the grading requirements; the disadvantages of metamorphic rock as a graded crushed stone material are: the proportion of needle-like particles is relatively large, it is easy to segregate and difficult to compact during paving construction, and it may be broken under load. large instantaneous deformation

For areas where limestone materials are scarce, it is not possible to adapt measures to local conditions. If purchased from other areas, it will increase transportation costs and time, which will lead to increased construction costs and affect construction efficiency.

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