Hardened ordinary cement paste elastic modulus multiscale predication method

Abstract

The invention discloses a hardened ordinary cement paste elastic modulus multiscale predication method. The method provided by the invention comprises the following steps of: step A: dividing hardened ordinary cement paste into different scales according to microstructure composition, wherein the different scales comprise different typical phases; step B. acquiring the volume percentage composition of each phase in different scales of the hardened ordinary cement paste; and step C. sequentially calculating the elastic modulus of each scale of the hardened ordinary cement paste from the minimum scale by adopting an upward gradual homogenization method, wherein the elastic modulus of the maximal scale is the elastic modulus of the hardened ordinary cement paste. According to the invention, a hardened ordinary cement paste elastic modulus multiscale predication model is established according to cement and hydration product essential attributes as well as cement paste microstructure composition and development principle, so that the relationship between the cement paste microstructure and macro-properties is established, and the problems of multiple influence factors on macro-properties of cement-based materials and high discretization of test data are solved essentially.

Description

technical field [0001] The invention relates to a multi-scale prediction method for elastic modulus of hardened ordinary cement paste, and belongs to the technical field of cement-based materials. Background technique [0002] The modulus of elasticity is the basic mechanical property of hardened cement-based materials and is one of the most important parameters for structural design. Researchers at home and abroad have conducted a large number of experimental studies on the macroscopic properties of cement-based materials, trying to clarify the quantitative relationship between the mix ratio, cement dosage, aggregate, etc. of cement-based materials and macroscopic properties. However, whether it is the traditional method of measuring the elastic modulus of cement-based materials through the load-deformation relationship or non-destructive testing such as ultrasonic waves, it is time-consuming, labor-intensive and waste-generating. At the same time, due to raw materials, mix...

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Problems solved by technology

However, whether it is the traditional method of measuring the elastic modulus of cement-based materials through the load-deformation relationship or non-destructive testing such as ultrasonic waves, it is time-consuming, labor-intensive and waste-generating. At the same time, due to raw materials, mix ratios, environmental conditions, testing equipment and Due to the test method and the operation technique of the test personnel, the elastic parameters given have a large dispersion.

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