Method for measuring interlocking capability of coarse aggregate

Abstract

The invention relates to a method for measuring the interlocking capability of coarse aggregate, belonging to the technical field of road material design evaluation. The method comprises the following steps of: (1) filling coarse aggregate gravels into a rigid test barrel and ramming the coarse aggregate gravels; (2) penetrating a conical rigid squeeze head into the gravels at a certain loading speed rate, and recording a penetration depth H and a squeeze force (resistance) F suffered by the rigid squeeze head; and (3) working out a penetration power W0= the integral of Fdh from 0 to H so as to evaluate the interlocking capability of the coarse aggregate. The method evaluates the interlocking capability of the coarse aggregate grading gravels by adopting the conical squeeze head penetration test, and effectively avoids the defects in the original test methods, i.e., aggregate mixing ratio is changed and real properties of design grading can not be correctly reflected due to serious aggregate breakage in the pressing-in process. In addition, the method takes energy indexes in terms of material deformation and stress into full consideration, adopts the penetration power to evaluate the interlocking capability of the coarse aggregate and more fully reflects the whole properties of the material when compared with simpler deformation index.

Description

technical field [0001] The invention mainly relates to the field of road engineering design and construction, in particular to a method for testing the embedding ability of a coarse aggregate skeleton. Background technique [0002] The strength of asphalt mixture mainly comes from two aspects: one is the cohesive force of the mixture formed by the cementing ability of asphalt to the mineral materials, and the other is the internal friction force formed by the mutual embedding of the mixture and mineral materials. For coarse aggregate dis-graded asphalt mixture, the intercalation ability of coarse aggregate with a particle size greater than 4.75 mm has a significant impact on the strength of the mixture. [0003] Although the "embedding" ability is not a mechanical index in the strict sense, it is very important for the accumulation structure of granular particles. The mutual "occlusion" between skeleton coarse aggregate particles is one of the important factors affecting th...

Images