Thermomechanical Properties of Polypropylene-Based Lightweight Composites Modeled on the Mesoscale
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JMEPEG (2017) 26:5166–5172 DOI: 10.1007/s11665-017-2967-1
Thermomechanical Properties of Polypropylene-Based Lightweight Composites Modeled on the Mesoscale Darina Dosta´lova´, Vratislav Kafka, David Vokoun, Ludeˇk Heller, Libor Mateˇjka, Luka´sˇ Kaderˇa´vek, and Jan Peˇncˇı´k (Submitted April 11, 2017; in revised form July 6, 2017; published online October 3, 2017) A waste-based particle polymer composite (WPPCs) made of foam glass and polypropylene was developed as a low-cost construction material. Thermomechanical properties of the composite, including creep properties of WPPC and polypropylene binder, were examined. By adding a relatively small amount of polypropylene to foam glass (about 2:8 in volume parts), the maximum bearing capacity at room temperature of the composite increased from 1.9 (pure foam glass) to 15 MPa. A significant creep strain accumulated during compressive loading of WPPC (5 MPa) in the first 2000 s at elevated temperatures (40, 60 °C). In the study, KafkaÕs mesomechanical model was used to simulate creep strain changes in time for various temperatures. The applicability of KafkaÕs mesomechanical model for simulating creep properties of the studied composite material was demonstrated. Keywords
building material, composite, creep tests, mesomechanical model, thermal insulation
List of symbols General mechanics
1. Introduction Polypropylene (PP) fibers have been used in civil engineering applications for several last decades. Specifically, PP fibers are used in concrete as reinforcement or as a material compound enhancing cracking resistance in concrete (Ref 1). The fibers are also added to soils in order to reduce the brittleness of soil stabilized by lime (Ref 2). Furthermore, an addition of the fibers is beneficial in asphalts for road construction (Ref 3). Polypropylene might be a waste material and mixed with other materials; it may reduce the cost of the final composite products. Additionally, PP features low thermal conductivity and hence, it is usable as a thermal insulator applicable for low-energy buildings (Ref 4). Mechanical properties of PP can be adjusted by the molecular weight, degree of crystallinity, or the way of processing (Ref 5, 6). In our study, mechanical properties, such as creep behavior, of waste-based particle polymer composite (WPPC) made from PP and recycled foam glass (FG) were examined. The WPPC was designed as a construction material providing both suitable thermal and mechanical properties in order to become a material of choice for thermal insulation in a humid environment Darina Dosta´lova´, Faculty of Civil Engineering, Brno University of Technology, Brno, Czech Republic and Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic; Vratislav Kafka, Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prague, Czech Republic; David Vokoun and Ludeˇk Heller, Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic; Libor Mateˇjka and Jan Peˇncˇ´ık, Faculty of Civil Engineering, Brno U
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