Method for testing apparent characteristics of road aggregate
A technology of aggregate table and detection method, which is applied in image data processing, instrumentation, calculation, etc., can solve the problems of heavy workload, long time consumption, and inability to characterize the characteristics of a single aggregate in the direct method, and achieve comprehensive appearance characteristics, The test speed is improved to make up for the effect of a single test method
Inactive Publication Date: 2017-05-31
WUHAN UNIV OF TECH +1
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[0004] The purpose of the present invention is to provide a method for testing the apparent characteristics of aggregates, which can effectively overcome the shortcomings of the traditional indirect method that cannot characterize the characteristics of a single aggregate, the direct method has a large workload, and takes a long time to test the surface of aggregates quickly, comprehensively and accurately. Visual characteristics
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Embodiment 1
[0039] Prepare aggregate test samples:
[0040] A limestone was selected as the test sample. A certain number of aggregates are selected for each level according to the specifications to carry out 0, 500 and 1000 times of Los Angeles abrasion tests respectively. During the experiment, no steel balls are placed. Sieve the worn aggregates, clean the stone powder generated by friction and collision and the aggregates whose particle size does not meet the requirements, clean the sun-dried aggregates, and dry them in an oven at 105°C until constant. Cool to room temperature in a closed desiccator.
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The invention discloses a method for testing apparent characteristics of a road aggregate. The method comprises the steps of cleaning a to-be-tested aggregate, drying the cleaned to-be-tested aggregate, and putting the dried to-be-tested aggregate in a sealed drying box for cooling; imaging the aggregate under a high-magnification camera through an aggregate image measurement system (AIMS); calculating a sphericity index SP for representing a three-dimensional shape of the aggregate; calculating an angularity index GA of the aggregate to represent an aggregate size and a contour change feature; and calculating a texture index TX of the aggregate to represent a surface texture of the aggregate. According to the new method provided by the invention, the apparent characteristics of the tested aggregate are all obtained by an instrument, so that errors generated due to subjective factors of test personnel in an indirect test method and a direct test method are effectively avoided, the time of the test personnel is saved, and the test efficiency is greatly improved.
Description
technical field [0001] The invention belongs to the field of road engineering and specifically relates to a detection method for the apparent characteristics of road aggregates. Background technique [0002] In the field of road engineering, the apparent properties of aggregates, including shape index, texture index, and angularity index, have a great influence on the adhesion between aggregates and asphalt, the durability and mechanical properties of asphalt mixtures, and so on. , Accurately testing the apparent characteristics of aggregates can optimize the processing technology and control indicators of aggregates. [0003] At this stage, my country's codes mainly stipulate the physical and mechanical performance indicators of aggregates, but there is no clear regulation on the apparent characteristic indicators, and there is a lack of reasonable and effective methods for testing the apparent characteristic indicators of aggregates. Therefore, at this stage, a A fast, com...
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CPCG06T7/0004G06T2207/10004G06T2207/30132
Inventor 罗蓉刘彬张德润张世飚李磊冯光乐董华均金露阳正茂王丽静丁春燕吴斌
Owner WUHAN UNIV OF TECH