采用发泡聚苯乙烯保温砂浆芯材的夹芯叠合板受弯性能

为了提升装配式建筑预制夹芯保温叠合板（CSICPs）的工业化生产效率，从材料密度、吸水率、导热系数、抗压强度、抗折强度、压折比及软化系数等指标出发，借助正交试验设计方法，采用极差及方差分析，确定适用于夹芯保温叠合板的发泡聚苯乙烯保温砂浆（ETIM）的最佳配比. 在此基础上，针对2块ETIM夹芯保温叠合板、1块发泡聚苯乙烯（EPS）板夹芯保温叠合板及1块普通钢筋桁架叠合板进行受弯性能对比试验，分别从承载能力、荷载-挠度曲线、荷载-钢筋应变曲线及抗滑移性能方面展开分析. 结果表明：夹芯保温叠合板与普通钢筋桁架叠合板的受弯破坏过程类似，均经历弹性阶段、弹塑性阶段及破坏阶段；预制底板构造形式及芯材对夹芯叠合板的受弯性能有较大影响；采用ETIM芯材的夹芯保温叠合板的受弯性能优于采用EPS板的夹芯保温叠合板；钢筋桁架的配置对提升夹芯保温叠合板的受弯及抗滑移性能有较为显著的作用.

Flexural behavior of sandwich composite panels with core material of expanded polystyrene thermal insulation motar

In order to improve the industrial production efficiency of prefabricated concrete sandwich insulation composite panels (CSICPs) for fabricated buildings, the effects of density, water absorption, thermal conductivity, compressive strength, flexural strength, tension-compression ratio, and softening coefficient of the block material were considered using the method of orthogonal experimental design. The optimum mix proportion of core materials, i.e. expanded polystyrene thermal insulation mortar (ETIM), which was suitable for CSICP was obtained by the analysis of range and variance. Based on this, comparison tests of bending performance were conducted among two CSICPs with ETIM core, one CSICP with expanded polystyrene board (EPS) core and one ordinary concrete composite slab with steel bar truss. Analysis were conducted from the perspectives of ultimate bearing capacity, load-deflection curves, load-rebar strain curves and anti-slip performance. Results show that the four specimens share similar flexural behaviors and undergo elastic phase, elastic-plastic phase and failure phase. The shape of precast bottom panel and the core material have great impact on the flexural performance of CSICPs. The flexural behavior of CSICP with ETIM core is better than that of CSICP with EPS core. Configuration of steel bar truss has a significant improvement on the flexural performance and anti-horizontal-slip performance of CSICPs.