Abstract: In order to enhance the thermal insulation performance of glazed hollow bead insulation mortar, microencapsulated phase change paraffin was added as phase change materials (PCMs) in the thermal insulation mortar to modify the mortar. The effect of microencapsulated phase change paraffin on the thermal conductivity of mortar was studied. Based on the central complex design test of the response surface method, ta-king the water-binder ratio, the amount of vitrified microbeads and the quantity of microencapsulated phase change paraffin were as the influence factors, and taking the thermal conductivity as the response surface a three-dimensional response model for the thermal conductivity of mortar was established to seek the optimal mix ratio of thermal insulation mortar, minimizing the thermal conductivity of modified vitrified microbeads thermal insulation mortar. The findings show that microencapsulated phase change paraffin can significantly improve the thermal insulation perfor-mance of vitrification microbeads insulation mortar. When the amount of vitrification microbeads and microencapsulated phase change paraffin is 73.54% and 5.54%, respectively, and the water-binder ratio is 3.542, the thermal conductivity of the insulation mortar reduces by 35.71% compared with the maximum value of 0.070 W/(m·K) stipulated in the code. The accuracy of the Maxwell model to predict mortar thermal conductivity is from 94.7% to 99.9%.
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2025, Vol. 39 
