Abstract
Expanded polystyrene (EPS) concrete is commonly used as the core material of commercial sandwich panels (CSPs). It is environmentally friendly and lightweight but has poor strength. Adding fibers can improve the microstructure of EPS concrete and reduce the weakening effect of EPS beads on the mechanical properties of concrete. An orthogonal experimental design (OED) was used in this paper to analyze the influence of length and content of polypropylene fiber (PF), glass fiber (GF), and carbon fiber (CF) on the physical and mechanical properties and micromorphology of EPS concrete. Among them, CFs have the most apparent impact on concrete and produce the most significant improvements in all properties. According to the requirements of the flexural performance of CSPs, the splitting tensile strength was taken as the optimization index, and the predicted optimal combination (OC) of EPS concrete with fibers was selected. The variations in the material properties, mechanical properties, and microstructure with age were analyzed. The results show that with increasing age, the dry density, compressive strength, and splitting tensile strength of concrete are markedly improved relative to those of the CSP core material and the control case (CC), and even the degree of hydration is improved.
Highlights
Introduction iationsExpanded polystyrene (EPS) beads are byproducts of petroleum engineering and have the advantages of facility acquisition low densities, economical prices, low water absorption, and great thermal insulation performance
The minimum value appears at level 2, andthe the maximum value appears at level 3
The minimum value appears at level 2, and the maximum value appears at level 3
Summary
Co., Ltd. from Weifang, China) according to the requirements of P. O. 42.5 in GB1752007 [30] and Type I in ASTM C150-20 [31] was used. Natural river sands (NRSs) were used as fine aggregates and tested by the screening method and moisture proportion measurement method specified in GB/T 14684-2011 [34]. A polycarboxylate-based superplasticizer (SP) (S04B type) was adopted. The fibers used in this were adopted and tested under the screening method and article included PF, GF, and CF, which had lengths of 6 mm, 9 mm, bulk and density. The macrostructure and main physical performance of the fibers are separately article included PF, GF, and CF, which had lengths of 6 mm, 9 mm, and 12 mm, respectively. Macrostructure and main physical performance of the fibers are separately shown in Figure 1 and Table 4.
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