Method for calculating porosity and characterizing pore parameter of porous concrete

Abstract

The invention belongs to the technical field of analysis of a pore parameter of concrete, and relates to a method for calculating the porosity and characterizing a pore parameter of porous concrete. An optimal-design grinding chamber having a profile made from a brittle material is adopted to cooperate with a grinding cutter for performing layer-by-layer dry grinding on a polyphase material test piece layer at a constant spacing; a continuous profile image of the polyphase material test piece is shot, and an image processing software is used for performing registration, standardization processing and pretreatment on the continuous profile image of the polyphase material test piece to obtain a standard usable continuous profile image of the polyphase material test piece. During acquisitionof the continuous profile image, registration of the profile image in a Z axis is taken into consideration, so that the continuous profile image with a relatively small interlayer spacing and comparatively high calibration degree is obtained. The image has the feature of a ''CT-simulative'' image, and the obtained true color image overcomes the defect of loss of information content of a CT-scannedgrayscale image. The method is simple and fast in image acquisition, is low in cost of image acquisition, and is convenient for application and popularization, and the information content of an obtained image is complete.

Description

Technical field: [0001] The invention belongs to the technical field of concrete pore parameter analysis, and relates to a porous concrete porosity calculation and pore parameter characterization method, which calculates the porosity of the porous concrete and characterizes the pore parameters of the porous concrete based on a three-dimensional reconstructed porous concrete model. Background technique: [0002] Concrete (abbreviated as concrete) refers to the general designation of engineering composite materials that aggregate aggregates into a whole by cementitious materials. The term concrete usually refers to cement as cementitious material, sand and stone as aggregates; (Can contain admixtures and admixtures) According to a certain proportion, the cement concrete obtained by mixing is also called ordinary concrete, which is widely used in civil engineering. Porous concrete is more and more popular as a new type of porous and lightweight concrete material. Based on the p...

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Problems solved by technology

[0007] A comprehensive analysis of the above porosity calculation methods shows that the gravimetric method and the volumetric method are mainly based on the experimental principle of porosity measurement. These two methods ignore the influence of closed pores, and the measured porosity is the effective porosity (connected pores and semi-connected pores). The sum of connected pores); the image analysis method is based on the image analysis principle of the continuous tomographic image of concrete for measurement, and the surface porosity is measured for each section image, and the average value is taken as the total porosity value of concrete. This method is based on the planar image It describes the distribution of planar pores, and does not involve the study of the three-dimensional spatial distribution of porous concrete. The description of the pore structure is relatively abstract, and the calculated porosity is the total planar porosity (connected pores, semi-connected pores and closed pores). and); the above methods can calculate the porosity of porous concrete, but there is no distinction between effective porosity and total porosity, the calculation of porosity is relatively simple, and it does not involve the numerical simulation research field of porous concrete, and there is no vivid description of porous concrete. The characteristics of concrete pore structure

[0008] In addition, pore tortuosity, connectivity, pore-throat ratio, throat width, and coordination number are all important spatial parameters of porous concrete pores, which have an important impact on the strength and water permeability of porous concrete. Due to the complexity and irregularity of the existing technology, it is still difficult to study the pore space parameters.

Therefore, in view of the deficiencies in the research on the pore structure and water permeability of porous concrete, the difficulty in obtaining the pore space structure and the slow progress of the pore structure research, a numerical model-based calculation of the porosity of porous concrete and the characterization of the pore parameters was developed and designed. method

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