Experimental investigation on flexural behavior of prefabricated sandwich insulation wall panels with textile reinforced engineered cementitious composites as the wythes after freeze-thaw cycles

This paper proposes a novel prefabricated sandwich insulation wall panels (PSIWP) with textile reinforced engineered cementitious composites (TRE) as inner and outer wythes. A parametric analysis conducted using an experimental approach focuses on the influence of the freezing-thawing conditions, the freezing-thawing cycle times, the thickness of the TRE wythes, the type of the thermal insulation layer, the textile treatment methods and the thickness of the thermal insulation layer. The derivation of calculation formulas of fully composite and non-composite TRE-PSIWP, as well as the analysis of the composite degree of TRE-PSIWP were carried out based on the concrete bending capacity calculation formula. It was found that the flexural bearing capacity and the cooperative working performance of TRE-PSIWP weakened after the freeze-thaw cycles. On the contrary, the ductility of TRE-PSIWP increased after the freeze-thaw cycles. Increasing the thickness of thermal insulation layer and TRE wythes were contributed to improve the flexural bearing capacity of TRE-PSIWP. Treating the textiles with impregnation and sand burning was also contributed to improve the flexural bearing capacity of TRE-PSIWP. For different thermal insulation materials, the cooperative working performance of the TRE wythes and the expanded polystyrene board (EPS) was the best.