Method for determining fineness modulus of sand by utilizing image analysis technology

Abstract

The invention belongs to the technical field of research and application of civil engineering materials and relates to a method for determining the fineness modulus of sand by utilizing an image analysis technology. The method comprises the eleven specific steps: sampling, photographing, preprocessing images, calibrating a scale, separating sand grains from the background, dividing the adhered sand grains, treating the sand grains on the image boundary, treating the sand grains with holes, determining the minimum Ferrette diameter, carrying out grain-diameter filtering on the sand grains and calculating the fineness modulus of the sand. The method has the advantages that the image analysis method is adopted for calculating the fineness modulus of the sand for the first time, and the criterion that the volume ratio and the weight ratio is equal is applied, so that the weighing process of the sand is avoided; the minimum Ferrette diameter is adopted as the equivalent grain diameter of the sand which can be sieved, so that the accuracy of determined data is better guaranteed; and the method is novel in design, reliable in principle, simple in operation, scientific in calculation, accurate in data, low in cost and high in automation degree.

Description

Technical field: [0001] The invention belongs to the technical field of research and application of civil engineering materials, and in particular relates to a method for measuring the fineness modulus of sand, which accurately measures the fineness modulus and average particle diameter of the sand by means of image analysis and processing technology. Background technique: [0002] As we all know, concrete is an indispensable material in civil engineering, and the fineness of sand plays an important role in the mix design of concrete. If the fineness of sand changes, the sand rate and water addition should be adjusted accordingly. Adjustment can maintain the workability of concrete. The fineness modulus of sand is an index that characterizes the degree of fineness and type of particle size of natural sand and artificial sand. Although it cannot fully reflect the gradation of particles, as a concise index, it can still be used in a certain The degree reflects the difference ...

AI Technical Summary

Problems solved by technology

[0007] The above calculation method not only requires specific related equipment, but also has high labor intensity and low efficiency. Due to the need for repeated weighing and human judgment that the sample throughput per minute is less than 0.1% of the total sample volume, it is easy to cause certain error

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