IJE TRANSACTIONS A: Basics Vol. 28, No. 7, (July 2015) 978-983 International Journal of Engineering Journal Homepage: www.ije.ir M. J. Hashemi, M. Jamshidi * Polymer Research Lab., School of Chemical Engineering, Iran University of Science and Technology (IUST) Iran PAPER INFO Paper history: Received 14 January 2015 Received in revised form 17 May 2015 Accepted 11 June 2015 Keywords: Polyester Resin Polymer Concrete Flexural Strength Chemical Aggressive Durability ABSTRACT Polymer concrete (PC) is a composite material prepared by resin and aggregates. Advantages of polymer concretes include rapid curing, high flexural and compressive strengths, suitable chemical resistance and low permeability. In this research, a comparative study was performed on degradation of polyester resin concrete in different chemical solutions. Polymer concrete specimens were examined for flexural strength and flexural toughness after two and four months of exposure to the chemicals (i.e. sulfuric acid, sodium hydroxide, sodium sulfate, nitric acid, hydrochloric acid, citric acid, demineralized water, potable water, potassium hydroxide, gas oil). Results showed that the highest decrease in flexural strength occurred in sodium hydroxide solution after two months of exposure. Comparing acid attack to the specimens it was found that citric acid as an organic acid, despite of higher pH, had the highest impact on flexural strength. The flexural strength of PC specimens decreased considerablly in all chemicals (except in gas oil). There was not significant difference between two and four months of exposuring, therefore, the main degrading processes start during the first 60 days of exposuring. doi: 10.5829/idosi.ije.2015.28.07a.03 1. INTRODUCTION 1 The development of new composite materials increased strength and durability compared to conventional types which these are major requirements for repairing materials and infrastructural applications. Polymer concrete(PC) is an example of a relatively new materials with such high performances [1]. PC is a composite material in which resin is used as binder for aggregates instead of Portland cement [2]. Polymer concretes are used increasingly in construction and manufacturing applications requiring versatile, high-strength, enduring concretes. It has the potential for widespread use in corrosive environments (for bridges, tunnel linings, etc.) and in the electric power industry (as a possible replacement for porcelain) [3]. Application of these materials was particularly popular in the construction industry during the early 1950s [4]. It is reported to have used in a range of civil and structural applications such as bridge decking, concrete crack repair, pavement 1 *Corresponding Author’s Email: [email protected] (M. Jamshidi) overlays, hazardous waste containers, waste water pipes and decorative construction panels [5]. In conventional concretes, the alkaline Portland hydraulic cement forms voids and cracks during hydration. Aggressives can intrude through these defects and degrade concrete bulk. In PC, however, the more compact polymer binder tends to eliminate open voids [3]. This cause improved water permeability and chemical resistance. Industrial applications of unsaturated polyesters (UPs) began in the 1940s. Unsaturated polyester resin (UPR) is one of the binders used in polymer concretes providing excellent adhesion to solid particulate fillers, good stiffness, dimensional stability and a high damping ratio [6, 7]. Unsaturated polyestester resins have unsaturated carbon-carbon bonds in polymer backbone. These unsatturated bonds make these polymers thermoset and help them to be cured at room temperature using curing agent and accelerator. Polymer concrete’s excellent mechanical strength and durability reduce the need for maintenance and frequent repairs required by conventional concrete. An RESEARCH NOTE Flexural Behavior of Polyester Polymer Concrete Subjected to Different Chemicals Please cite this article as: M. J. Hashemi and M. Jamshidi, Flexural Behavior of Polyester Polymer Concrete Subjected to Different Chemicals,International Journal of Engineering (IJE), TRANSACTIONS A: Basics Vol. 28, No. 7, (July 2015) 978-983
Flexural Behavior of Polyester Polymer Concrete Subjected to Different Chemicals
Apr 29, 2023
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