Gündüz, Güngör
The interfacial bond between a steel fibre and concrete generally increases with the polymer content. Naphthalene used to generate new pores in order t increase the polymer loading and thus to increase the interfacial bond strength has a positive effect up to 3% by weight. Higher amounts weaken the cementitious phase and also decrease the amount of polymer incorporated. Drying of concrete before impregnation at 150°C rather than at 105°C increases the polymer loading and thus the interfacial bond strength. An increase in polymer loading without changing the original porosity, as in pressure or vacuum impregnation, increases the interfacial bond strength. Vacuum impregnation gives a higher interfacial bond strength than pressure impregnation. This could be due to the diffusion of monomer molecules into evacuated micro-pores. Thus, improved adhesion can be achieved between the polymer and the cemetiitious phase and steel fibre by means of vacuum impregnation.


Effects of hollow glass microsphere density and surface modification on the mechanical and thermal properties of poly(methyl methacrylate) syntactic foams
ÖZKUTLU DEMİREL, MERVE; Dilek Hacıhabiboğlu, Çerağ; Bayram, Göknur (Elsevier BV, 2018-10-15)
Syntactic foams offer low density polymers for insulation and transportation applications with the advantage of having high mechanical properties. In this study, poly(methyl methacrylate) (PMMA) syntactic foams were produced with three different types of hollow glass microspheres (HGMs) as low, medium and high density. It was observed that the density of the syntactic foams was in inverse ratio to the strength properties of the syntactic foams. The lowest measured syntactic foam density was obtained with th...
Effect of spraying rate on microstructure of spray deposited Al-Fe-V-Si alloy
Kalkanlı, Ali (Informa UK Limited, 2003-12-01)
In this study gas atomisation and spray deposition of a series of AlFeVSi alloys were carried out. Traces of transient liquid were observed as lamellar structure in the middle of the specimen. The heat transfer conditions of this structure were modelled by finite difference calculation. Metallographic specimens for optical microscopy were prepared from the preforms formed in these processes. Optical microscopy showed the presence of dispersoids in the specimens. The dispersoids were characterised as AlFeVSi...
Stress redistribution around fiber breaks in unidirectional steel fiber composites considering the nonlinear material behavior
SABUNCUOĞLU, BARIŞ; Mutlu, Çağlar; Kadıoğlu, Fevzi Suat; Swolfs, Yentl (Elsevier BV, 2020-05-01)
The use of steel fibers as reinforcement in polymer composites is recently increasing thanks to their ductility, high stiffness and wide range of diameters. Unlike carbon and glass fibers, steel fibers often end up with a non-circular cross-section due to their manufacturing technology. This may influence the stress redistribution around fiber breaks, which is important in longitudinal tensile failure of unidirectional composites. A parametric study was performed by using 3D finite element models with rando...
Effect of Polymer Additives and Process Temperature on the Physical Properties of Bitumen-Based Composites
Dogan, Mehmet; Bayramlı, Erdal (2009-08-15)
Polymer modified bitumen (PMB) is a binder obtained by the incorporation of polymer into the bitumen by mechanical mixing or chemical reaction. This study deals with the modification of bitumen with three types of polymers (LDPE, EVA, and SBS) in the presence of filler (CaCO3). The morphological, mechanical, rheological properties, and thermal conductivity of the PMBs have been analyzed by scanning electron microscopy, tensile testing, melt flow index (MFI) measurements and hot wire method, respectively. Th...
Effect of carbon fiber amount and length on flame retardant and mechanical properties of intumescent polypropylene composites
ATABEK SAVAŞ, Lemiye; Mutlu, Aysenur; Dike, Ali Sinan; Tayfun, Umit; DOĞAN, Mehmet (SAGE Publications, 2018-02-01)
The effects of carbon fiber amount and length were studied on the flame retardant, thermal, and mechanical properties of the intumescent polypropylene composites. The flame retardant properties of the intumescent polypropylene-based composites were investigated using limiting oxygen index, vertical burning test (UL-94), and mass loss calorimeter. The mechanical properties of the composites were studied using tensile test and dynamic mechanical analysis. According to the flammability tests results, the antag...
Citation Formats
G. Gündüz, “EFFECT OF POROSITY ON INTERFACIAL FAILURE IN STEEL-FIBER-REINFORCED POLYMER-IMPREGNATED CONCRETE,” COMPOSITES SCIENCE AND TECHNOLOGY, pp. 121–136, 1988, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51180.