Simulation testing method for mixed coarse aggregate compactness
A simulation test, coarse aggregate technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of difficult to monitor the mesoscopic structural characteristics of mixed coarse aggregate, lack of mixed coarse aggregate, coarse aggregate grade Problems such as long configuration cycle
Inactive Publication Date: 2014-07-09
SOUTHEAST UNIV
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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
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[0071] According to the technical scheme of the present invention, this embodiment provides a simulation test method for the compactness of mixed coarse aggregates, using 19-31.5mm coarse aggregates and 9.5-19mm coarse aggregates with a total mass of 6kg produced in Yinghu, Ankang. The composition of mixed coarse aggregate (mass ratio of 19-31.5mm coarse aggregate to 9.5-19mm coarse aggregate is 100:50) is taken as an example to illustrate the implementation steps of the simulation test method for the density of mixed coarse aggregate:
[0072] (1) Construction of physical model of mixed coarse aggregate
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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...
Claims
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Inventor 孙璐任皎龙
Owner SOUTHEAST UNIV