With the full factor experimental design method carried out, 20 sets of EPS concrete specimens with different mass fractions of Corn Straw Fiber (CSF) and Expanded-Polystyrene (EPS) particles were designed to study their density, water absorption, compressive strength, flexural strength, splitting tensile strength, mass loss and strength loss after freeze-thaw cycles, and changes in thermal conductivity, to evaluate the effect of CSF content and EPS content on the properties of EPS cement-based composites. The experimental results show that adding CSF can improve the mechanical properties of EPS concrete while reducing its density, the maximum increase rate of compressive strength is 69.7 %, with a maximum value of 1.12 MPa; The maximum improvement rate of flexural strength is 127.38 %, with a maximum value of 0.885 MPa; The maximum improvement rate of splitting tensile strength is 68.07 %, and the maximum value is 0.256 MPa. After 50 standard freeze-thaw cycles, straw fibers can delay the quality loss of EPS concrete, but show adverse effects on its strength loss, the maximum quality loss rate is 4.23 %, and the maximum loss rates for the three strengths are 24.46 %, 24.22 %, and 24.61 %, respectively. In addition, in terms of improving the thermal insulation performance of EPS concrete, the role of the two aggregates is manifested as EPS > CSF, and the thermal conductivity coefficient values under different aggregate dosages were obtained, when the content of EPS is 1.4 % and the content of CSF is 4 %, the minimum thermal conductivity value is 0.0402 W/(m·°C), and the thermal conductivity coefficient of calcium silicate board is 0.0378 W/(m °C) by the thermal conductivity coefficient formula of composite materials. which can serve as a reference for selecting building insulation materials in areas with high temperature differences.

中文翻译：

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玉米秸秆纤维(CSF)增强EPS混凝土的制备及性能试验研究

采用全因子试验设计方法，设计了20组不同质量分数玉米秸秆纤维（CSF）和发泡聚苯乙烯（EPS）颗粒的EPS混凝土试件，研究其密度、吸水率、抗压强度、抗折强度、劈裂拉伸强度、冻融循环后的质量损失和强度损失以及导热系数的变化，评价CSF含量和EPS含量对EPS水泥基复合材料性能的影响。实验结果表明，添加CSF可以提高EPS混凝土的力学性能，同时降低其密度，抗压强度最大提高率为69.7%，最大值为1.12 MPa；弯曲强度最大提高率为127.38%，最大值为0.885 MPa；劈裂抗拉强度最大提高率为68.07%，最大值为0.256 MPa。经过50次标准冻融循环后，秸秆纤维可以延缓EPS混凝土的质量损失，但对其强度损失表现出不利影响，最大质量损失率为4.23%，三种强度最大损失率为24.46%，分别为 24.22% 和 24.61%。另外，在提高EPS混凝土保温性能方面，两种骨料的作用表现为EPS>CSF，并得到了不同骨料掺量下的导热系数值，当EPS掺量为1.4%时， CSF含量为4%时，导热系数最小值为0.0402 W/(m·℃)，由复合材料导热系数公式可知硅酸钙板导热系数为0.0378 W/(m·℃)材料。可为温差较大地区选择建筑保温材料提供参考。