Simulation testing method for mixed coarse aggregate compactness

Abstract

The invention discloses a simulation testing method for mixed coarse aggregate compactness. The simulation method includes setting a mixed coarse aggregate physical model, subjecting the mixed coarse aggregate compactness to simulation testing including testing of basic parameters, simulation generation of a feed barrel and the mixed coarse aggregate, setting micromechanic parameters of the physical model, simulating vibration compacting process of the mixed coarse aggregate physical model, and calculating the mixed coarse aggregate compactness. The simulation testing method can quickly and accurately predict the mixed coarse aggregate compactness and reshow change laws of microscopic structure characteristics in the process of compacting the mixed coarse aggregate.

Description

technical field [0001] The invention belongs to the field of traffic civil engineering, and relates to a simulation test method for the compactness of mixed coarse aggregates. The mixed coarse aggregates are formed by mixing coarse aggregates of various specifications according to a certain gradation. The present invention is based on PFC 2D The software platform can conveniently monitor the change law of the mesoscopic structural characteristics during the compaction process of mixed coarse aggregates, and quickly and accurately predict the density of mixed coarse aggregates, which can be used to assist in the optimization of the mix ratio of road materials to improve material design. efficiency and reduce design cost. Background technique [0002] In the field of traffic civil engineering, road materials are usually composed of coarse aggregate, fine aggregate and binder, among which, the content of coarse aggregate is more than 50%, so the gradation of coarse aggregate p...

AI Technical Summary

Problems solved by technology

[0003] The applicant analyzed the above-mentioned indoor test method for the density of mixed coarse aggregates and found the following defects: (1) In the process of coarse aggregate gradation design, it is necessary to measure the density of a large amount of mixed coarse aggregates, resulting in a cycle of coarse aggregate gradation design process. Long, and waste a lot of manpower and material resources; (2) Lack of intuitive and clear indicators to evaluate whether the mixed coarse aggregate has reached the optimal compaction state; (3) It is difficult to monitor the mesoscopic structural characteristics of the mixed coarse aggregate during the compaction process

Images