Method for detecting rheological property of fluid concrete mixture in real time

Abstract

The invention provides a method for detecting the rheological property of a fluid concrete mixture in real time. The method comprises the following steps: continuously acquiring a plurality of fluid images of a fluid concrete mixture; performing enhancement processing on each acquired image by using a fixed image exposure threshold; calculating fractal dimension and multi-fractal spectrum parameters of each enhanced image through a fractal analysis method and a multi-fractal analysis method to obtain distribution characteristics of the coarse aggregate in a mortar body; carrying out statisticson the fractal dimension of the processed image family and the occurrence frequency of the multi-fractal parameter in each statistical grouping interval, and obtaining a value range and confidence interval of the coarse aggregate distribution parameter in the fluid concrete mixture based on the statistical principle; according to the fractal dimension and the multi-fractal spectrum parameters, acquiring the rheological parameter range of the fluid concrete mixture under the determined proportion by combining the value range and the confidence interval. With the method, the key control effectof the form and distribution characteristics of the coarse aggregate in the rheological property of the concrete can be reflected comprehensively and accurately.

Description

technical field [0001] The invention belongs to the field of engineering materials, and in particular relates to a method for evaluating and predicting rheological parameters of a fluid concrete mixture. Background technique [0002] The rheological parameters of concrete (mainly referring to yield stress and plastic viscosity) are the basic physical parameters describing the flow properties of concrete mixtures. The constructability of mixed concrete, its value change is significantly affected by the components of fresh concrete. Coarse aggregate is the main component of fresh concrete. Under a certain ratio, its gradation, particle size, particle shape, surface texture and solid accumulation state are the key factors affecting the rheology of fresh concrete. [0003] Existing methods that can reflect the shape and stacking state of coarse aggregate usually obtain macro-geometric parameters such as coarse aggregate void ratio, sphericity, roundness, and needle-like coarse ...

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Problems solved by technology

[0005] Purpose of the invention: Aiming at the deficiencies of the prior art, the present invention proposes a real-time detection method for the rheological properties of freshly mixed fluid concrete mixture, which can comprehensively and accurately reflect the key of coarse aggregate morphology and distribution characteristics in the rheological properties of concrete The control function solves the shortcomings of existing macroscopic geometric parameters based on coarse aggregate that can only qualitatively evaluate the rheological properties of concrete or cannot be meticulously and accurately quantitatively evaluated and regulated

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