He Diyang, Zheng Wukui, Chen Zili, Qi Yongle, Zhang Dawang, Li Hui
School of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Polymers (Basel). 2022 Jun 21;14(13):2529. doi: 10.3390/polym14132529.
Concrete in which EPS (expanded polystyrene) particles partially or completely replace concrete aggregates is called EPS concrete. Compared to traditional concrete, EPS concrete has a controllable low density and good thermal-insulation performance, which make it promising for prospective applications. At present, research on EPS concrete mostly focuses on increasing its strength and EPS surface modifications. Few researchers have studied the influence of cementitious material strength and EPS-concrete density on the strength of EPS concrete. In this research, cement was used as the main material, and fly ash, silica fumes, and blast furnace slag were selected as admixtures. By changing the mixing proportions of the admixtures, the basic properties, such as the paste strength, change. Based on the mix proportions of the above different raw materials, EPS concrete with different density levels was prepared to explore the influence of the density of EPS concrete and the strength of cementitious materials on the strength of EPS concrete. The influence of the slurry strength on EPS-concrete strength was weaker than that of the density of EPS concrete. When the strength range of the cementitious materials is 35.770.5 MPa, the compressive strength range of 1000 kg/m, 1200 kg/m, and 1400 kg/m EPS concrete is 8.817.6 MPa, 11.418.0 MPa, and 15.726.6 MPa, respectively. Based on the experiments, the fitting equation to determine the EPS-concrete strength-EPS-concrete density-cementitious material strength is z = 69.00087 + 0.0244x - 0.1746y - 0.00189x + 0.0000504706y + 0.00028401xy. Additionally, a strength-increasing design method for EPS concrete with different densities prepared by conventional Portland cement is clarified. This study can guide the preparation of EPS concrete.
其中部分或完全用 EPS（发泡聚苯乙烯）颗粒替代混凝土骨料的混凝土称为 EPS 混凝土。与传统混凝土相比，EPS 混凝土具有可控的低密度和良好的保温性能，这使其在未来应用中具有广阔前景。目前，对 EPS 混凝土的研究大多集中在提高其强度和对 EPS 进行表面改性。很少有研究人员研究胶凝材料强度和 EPS 混凝土密度对 EPS 混凝土强度的影响。在本研究中，以水泥为主要材料，并选用粉煤灰、硅灰和高炉矿渣作为掺合料。通过改变掺合料的混合比例，诸如浆体强度等基本性能会发生变化。基于上述不同原材料的配合比，制备了不同密度等级的 EPS 混凝土，以探究 EPS 混凝土密度和胶凝材料强度对 EPS 混凝土强度的影响。浆体强度对 EPS 混凝土强度的影响弱于 EPS 混凝土密度的影响。当胶凝材料的强度范围为 35.770.5 MPa 时，1000 kg/m³、1200 kg/m³和 1400 kg/m³ EPS 混凝土的抗压强度范围分别为 8.817.6 MPa、11.418.0 MPa 和 15.726.6 MPa。基于实验，确定 EPS 混凝土强度-EPS 混凝土密度-胶凝材料强度的拟合方程为 z = 69.00087 + 0.0244x - 0.1746y - 0.00189x + 0.0000504706y + 0.00028401xy。此外，阐明了用传统硅酸盐水泥制备不同密度 EPS 混凝土的强度增强设计方法。本研究可为 EPS 混凝土的制备提供指导。
