Multi-scale prediction method for thermal expansion coefficient of hardened cement mortar

Abstract

The invention discloses a multi-scale prediction method for a thermal expansion coefficient of hardened cement mortar. The method comprises the following steps: carrying out multi-phase multi-scale division on hardened cement mortar; calculating the relative volume content of each composition phase on different scales; gradually homogenizing the elastic modulus parameter and the temperature stresscoefficient of each scale from the minimum scale to the large scale; and calculating the thermal expansion coefficient of the hardened cement mortar with the maximum scale. According to the microstructure composition of cement mortar and the elastic properties and the thermal properties of each composition phase, including the mix proportion of the cement mortar, the chemical composition of the cement and the variety of sand, the thermal expansion coefficient is determined by adopting a multi-scale method, and accurate parameters are provided for mechanical and deformation performance research, numerical simulation analysis and structural design of a cement-based material; and a multi-scale prediction model of the thermal expansion coefficient of the hardened cement mortar is established,prediction of the macroscopic performance of the cement mortar based on the microstructure is achieved, and the problem that many influence factors of the thermal expansion coefficient of the cementmortar exist is solved.

Description

technical field [0001] The invention belongs to the field of multi-scale calculation and analysis of cement-based materials, in particular to a multi-scale prediction method for the thermal expansion coefficient of hardened cement mortar. Background technique [0002] The thermal expansion coefficient is one of the most basic and important thermophysical characteristic parameters of cement-based materials, and the thermal expansion coefficient directly determines the temperature deformation. The research on the thermal expansion coefficient of cement mortar at home and abroad focuses on the macroscopic test method. Due to the raw materials, mix ratio, environmental conditions, test equipment and test methods, and the operating techniques of the test personnel, the given thermal expansion coefficient is relatively large. [0003] The overall performance of composite materials depends on the properties, geometry and topology of the constituent materials. Cement mortar is a co...

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Problems solved by technology

The research on the thermal expansion coefficient of cement mortar at home and abroad focuses on the macro test method. Due to the raw materials, mix ratio, environmental conditions, test equipment and test methods, and the operating techniques of the test personnel, the given thermal expansion coefficient is relatively large.

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