Highland road gradation crushed gravel material design method

Abstract

The invention discloses a highland road gradation crushed gravel material design method. The method comprises the following steps: 1, first-order filling: determining the bulk densities of single-sized aggregates having particle sizes of 4.75mm or more, establishing the relationship among the different aggregate proportion, a stamped density and a void ratio, and establishing an optimal composition ratio of the (20-31.5)mm aggregate to the (10-20)mm aggregate for forming a skeleton structure; 2, second-order filling: establishing an optimal composition ratio of the [(20-31.5)mm+(10-20)mm] aggregate to the (5-10)mm aggregate for forming a skeleton structure, and carrying out second-order filling to form a main skeleton; and 3, respectively obtaining the sieve residue rates of fine aggregates according to a standardized method, and filling the fine aggregates to the main skeleton to obtain a road gradation crushed gravel material. The design gradation pays attention to the skeleton effect of large particles and also gives consideration to the particle size sensitive area, so the generation of construction segregation and the like is avoided.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a design method of road graded gravel and gravel materials, in particular to a design method of plateau road graded gravel and gravel materials. Background technique [0002] The performance of materials is closely related to the structure of materials. For graded gravel and gravel materials, since there is no binder, its performance is more affected by particle gradation. [0003] When the amount of crushed stone in the graded gravel is small, the crushed stone particles and the large particles of natural gravel will be suspended in the fine material of natural gravel, and the coarse particles cannot contact each other to form a structure of intercalation, which is called suspension. Dense structure; with the increase of the amount of crushed stone in natural gravel, the crushed stone particles and the coarse particles of natural gravel begin to contact each other to form a space skeleto...

AI Technical Summary

Problems solved by technology

Although the dense skeleton structure has relatively high strength and deformation resistance, it is prone to segregation during construction.

Especially since there is no binder for this kind of material, if a dense skeleton structure is used during construction, the segregation of aggregates will be very serious

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