Multiscale prediction method of hardening normal cement neat paste thermal diffusivity

Abstract

The invention discloses a multiscale prediction method of hardening normal cement neat paste thermal diffusivity. The multiscale prediction method of the hardening normal cement neat paste thermal diffusivity comprises the following steps: starting multiphase and multiscale division based on a microcosmic structure and a composition of the hardening normal cement neat paste, containing typical phase at each scale, then calculating size percentage of different phases, and calculating and acquiring early age cement neat paste thermal diffusivity by upward gradual homogenization and a generalized self-consistent method based on the size percentage content of each phase on each scale.The multiscale prediction method of the hardening normal cement neat paste thermal diffusivity considers the influence of the hardening normal cement neat paste microcosmic structure and the performance of the composition materials to the cement neat paste generalized thermal diffusivity, influencing factors which are considered are comprehensive and reasonable, simple in form, and convenient to use. A prediction model which is established based on the multiscale prediction method of the hardening normal cement neat paste thermal diffusivity can accurately predict the thermal diffusivity with different water cement ratios and different categories of the hardening normal cement neat pastes.

Description

technical field [0001] The invention relates to a multi-scale prediction method for the thermal conductivity of hardened common cement paste, belonging to the technical field of cement-based materials. Background technique [0002] Thermal conductivity is the basic performance of hardened cement-based materials and one of the most important parameters for structural design. At the same time, thermal conductivity can better characterize the thermal conductivity of materials than thermal conductivity. 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 proportion of cement-based materials, the amount of cement, and aggregate equal to the macroscopic properties. At the same time, although previous studies have shown that the thermal conductivity and thermal conductivity of hardened cement-based materials satisfy a linear relations...

AI Technical Summary

Problems solved by technology

The thermal conductivity of cement-based materials changes with the change of its mix ratio, etc., and it is difficult to test and measure. The existing research results lack systematic research on the thermal conductivity of cement-based materials. Due to reasons such as testing methods and operating techniques of testers, the thermal parameters given are highly discrete.

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