Effectiveness of treatment methods on polypropylene fibres incorporated in cement mortars

Ince, Ceren
Fibre reinforcements are often used in cementitious materials to provide enhanced strength. However, the surface smoothness and inert chemical nature of polypropylene fibres result in an insufficient fibre-matrix bonding interface and hence lead to poor mechanical properties of these materials. Two distinct treatment methods, namely, porofication method and sulfuric acid-dichromate treatment method, are adopted to assess the effectiveness of these techniques on fibre-matrix interface properties. The paper begins with an investigation on the effectiveness of these methods on polypropylene fibres. The wetting characteristics of these fibres are determined using the water absorption test, contact angle measurements and scanning electron microscopy analysis. The study then focuses on the mechanical properties and durability of cement mortars incorporating treated polypropylene fibres. The void ratio, flexural and compressive strengths and split tensile strength are studied, and microstructural analyses are also carried out to support these measurements. The resistance to impact, freeze and thaw and carbonation of cement mortars incorporating treated polypropylene fibres is investigated. The treatment methods adopted in this study improve the interface between the hydrated cement product and fibres and also significantly enhance the mechanical properties and durability of these mortars incorporating polypropylene fibres.


Ideal Location of Intermediate Ring Stiffeners on Discretely Supported Cylindrical Shells
Topkaya, Cem (American Society of Civil Engineers (ASCE), 2014-04-01)
Silos in the form of a cylindrical metal shell are commonly elevated to provide access to the space beneath, permitting the contained materials to be directly discharged. A few discrete column supports at evenly spaced intervals are commonly used. However, the structural design of discretely supported cylindrical shells presents a variety of challenges. The presence of discrete supports results in circumferential nonuniformity in the axial compressive stress as well as a progressive vertical decay above the...
Efficient fabrication of ultrafine-grained 316L stainless steel surfaces for orthopaedic applications
Tufan, Yiğithan; Efe, Mert; Ercan, Batur (Informa UK Limited, 2019-10-13)
Commonly used severe plastic deformation (SPD) methods are suitable for fabrication of bulk nano and ultrafine-grained metals. Drawbacks of these methods include durability of dies, geometrical restrictions and reduced ductility of the products. In this study, two common machining techniques used in manufacturing of orthopaedic components, turning and milling, were applied on 316L stainless steel as surface SPD to refine the surface microstructures of the workpiece. Machining with optimised parameters resul...
Flexibility improvement of short glass fiber reinforced epoxy by using a liquid elastomer
Kaynak, Cevdet; Tincer, Teoman (Elsevier BV, 2003-03-17)
In certain applications of fiber reinforced polymer composites flexibility is required. The aim of this study was to improve flexibility of short glass fiber reinforced epoxy composites by using a liquid elastomer. For this purpose, diglycidyl ether of bisphenol-A (DGEBA) based epoxy matrix was modified with hydroxyl terminated polybutadiene (HTPB). A silane coupling agent (SCA) was also used to improve the interfacial adhesion between glass fibers and epoxy matrix. During specimen preparation, hardener and...
Fabrication of micropit structures on Ti6Al4V alloy using fluoride-free anodization for orthopedic applications
Izmir, Merve; Ercan, Batur (Cambridge University Press (CUP), 2019-04-15)
Ti6Al4V alloy is commonly used in hip and knee replacements due to its high strength, ductility, wear, and corrosion resistance. Despite its optimal physical and chemical properties, Ti6Al4V based orthopedic implants have a limited lifetime of only 15-20 years. One of the main reasons for having limited lifetime is the suboptimal integration of Ti6Al4V implants with the juxtaposed bone tissue (osseointegration). To enhance osseointegration, and thus prolong the lifetime of orthopedic implants, Ti6Al4V impla...
Analytical modeling of fiber reinforced composite deep beams
Yağmur, Eren; Burak Bakır, Burcu; Department of Civil Engineering (2018)
Discrete fibers are often used as reinforcement to increase the tensile and shear strengths of concrete. For many years, the behavior of fiber reinforced composite members has been investigated both experimentally and analytically. The influence of fibers on the behavior of shear critical members is quite significant, therefore, it is inevitable to develop a method, which estimates the shear strength of fiber reinforced composite deep beams realistically. This is why one of the main objectives of this study...
Citation Formats
C. Ince, “Effectiveness of treatment methods on polypropylene fibres incorporated in cement mortars,” EMERGING MATERIALS RESEARCH, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63871.