RESEARCH ON HEAT TRANSFER MECHANISM AND THERMAL PERFORMANCE OF WHEAT STRAW FLY ASH CONCRETE
DOI:
https://doi.org/10.31649/2311-1429-2025-1-151-161Keywords:
air humidity, straw content, thermal conductivity, hygrothermal performance, energy efficiencyAbstract
A large number of rural residential buildings in the world did not take effective thermal insulation measures. The poor
thermal insulation performance of the envelope led to low indoor temperatures in winter, and energy consumption was huge.
The purpose of this study was to explore the effect of wheat straw and fly ash incorporated into concrete on its thermal
properties, and to provide a low-cost and energy-efficient solution for rural building wall materials. The experiment involved
preparing concrete block samples containing different doses of fly ash and straw, building an experimental platform to
determine compressive strength and thermal conductivity, and simulating different humid environments using a saturated
saline solution to analyse the effect of moisture content on thermal conductivity. The effect of moisture content on thermal
conductivity was analysed by simulating different humidity environments with saturated salt solution. Combined with data fitting
and comparative analysis, the mechanism of straw admixture, morphology and humidity on the material properties was
revealed. The study showed that the thermal conductivity of wheat straw fly ash concrete decreased gradually as the content
of fly ash and straw increased, and the larger the content, the smaller the thermal conductivity. The thermal conductivity of
wheat straw fly ash concrete increased significantly with the increase in air humidity, and the relationship between moisture
content and thermal conductivity was closely related to the content of straw and fly ash. The incorporation of fly ash and straw
in concrete effectively improved the thermal insulation performance of building materials, and was an effective alternative for
improving building energy efficiency and reducing carbon emissions
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