Mechanical performance of FRP-confined geopolymer concrete under seawater attack

2019 ◽  
Vol 23 (6) ◽  
pp. 1055-1073 ◽  
Author(s):  
Radhwan Alzeebaree ◽  
Abdulkadir Çevik ◽  
Alaa Mohammedameen ◽  
Anıl Niş ◽  
Mehmet Eren Gülşan
Keyword(s):  
Mechanical Properties ◽  
Basalt Fiber ◽  
Fiber Reinforced Polymer ◽  
Geopolymer Concrete ◽  
Structural Elements ◽  
Fiber Reinforced ◽  
Ordinary Concrete ◽  
Reinforced Polymer ◽  
Fabric Materials ◽  
Durability Performance

In the study, mechanical properties and durability performance of confined/unconfined geopolymer concrete and ordinary concrete specimens were investigated under ambient and seawater environments. Some of the specimens were confined by carbon fiber and basalt fiber–reinforced polymer fabric materials with one layer and three layers under chloride and ambient environments to observe mechanical strength contribution and durability performances of these hybrid types of materials. These fiber-reinforced polymer fabric materials were also evaluated in terms of retrofit purposes especially in the marine structures. In addition, microstructural evaluation is also conducted using scanning electron microscope on geopolymer concrete and ordinary concrete specimens to observe the amount of deterioration in microscale due to the chloride attacks. Results indicated that confined specimens exhibited enhanced strength, ductility, and durability properties than unconfined specimens, and the degree of the enhancement depended on the fiber-reinforced polymer confinement type and the number of fiber-reinforced polymer layer. Specimens confined by carbon fabrics with three layers showed superior mechanical properties and durability performance against chloride attack, while specimens confined by basalt fabrics with one layer exhibited low performance, and unconfined specimens showed the worst performance. Both fiber-reinforced polymer fabric materials can be utilized as retrofit materials in structural elements against chloride attacks. The results also pointed out that seawater attack reduced the ductility performance of the geopolymer concrete and ordinary concrete specimens. Furthermore, geopolymer concrete specimens were found more durable than the ordinary concrete specimens, and both types of concretes exhibited similar fracture properties, indicating that geopolymer concrete can be utilized for structural elements instead of ordinary concretes.

scholarly journals Development of Innovative HFRP Bars

2018 ◽  
Vol 196 ◽  
pp. 04087 ◽  
Author(s):  
Kostiantyn Protchenko ◽  
Elżbieta Szmigiera ◽  
Marek Urbański ◽  
Andrzej Garbacz
Keyword(s):  
Carbon Fibers ◽  
Basalt Fiber ◽  
Structural Testing ◽  
Fiber Reinforced Polymer ◽  
Structural Elements ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Reinforced Polymer ◽  
Secondary Structural Elements ◽  
Intended Use

The main factors determining the choice of fiber-reinforced polymer (FRP) materials are the intended use of the designed structure and the environmental conditions in which it will be located. Currently, the FRP-based materials have a variety of applications in the construction industry, from the secondary structural elements of buildings, to a complicated designs, where the only FRPs were used. The advances in FRP technology have spurred interest in introducing innovative hybrid fiber-reinforced polymer (HFRP), which potentially can be used as reinforcing/enhancing material. This paper describes the investigation on newly-developed hybrid fiber-reinforced polymer HFRP bars, which were created by modification of basalt fiber-reinforced polymer BFRP bars in terms of physical substituting of the certain amount of basalt fibers by the part of carbon fibers. Modification is aimed at achieving of better properties in obtained material and simultaneously ensuring cost-effectiveness concept. The investigation includes the preparation and numerical considerations on HFRP bars as well as first attempts of experimental structural testing of innovative HFRP bars.

scholarly journals Application of basalt-FRP bars for reinforcing geotechnical concrete structures

2019 ◽  
Vol 265 ◽  
pp. 05011
Author(s):  
Marta Kosior-Kazberuk
Keyword(s):  
Mechanical Properties ◽  
Limit State ◽  
Basalt Fiber ◽  
Fiber Reinforced Polymer ◽  
Ultimate Limit State ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Metallic Reinforcement ◽  
Frp Bars ◽  
Basalt Fiber Reinforced Polymer

The fiber reinforced polymer (FRP) bars have become a useful substitute for conventional reinforcement in civil engineering structures for which load capacity and resistance to environmental influences are required. They are often used in concrete structural elements exposed to strong environmental aggression, such as foundations, breakwaters and other seaside structures, road structures and tanks. The basalt fiber-reinforced polymer (BFRP) is the most recently FRP composite, appearing within the last decade. Due to their mechanical properties different from steel bars, such as higher tensile strength and lower Young's modulus, BFRP bars are predestined for use in structures for which the ultimate limit state is rather decisive than serviceability limit state. Experimental tests were carried out to assess the influence of static long-term loads and cyclic freezing/thawing on the behaviour of concrete model beams with non-metallic reinforcement. The bars made of basalt fiber reinforced polymer (BFRP) and hybrid (basalt and carbon) fiber reinforced polymer (HFRP) were used as non-metallic reinforcement. The mechanical properties of both types of bars were also determined.

Research of the Properties of Basalt Fiber Reinforced Polymer Bar for Continuously Reinforced Concrete Pavement

2014 ◽  
Vol 505-506 ◽  
pp. 184-187
Author(s):  
Qi Yang Liu ◽  
Ming He
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Matrix Material ◽  
Basalt Fiber ◽  
Concrete Pavement ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Contraction Joints ◽  
Basalt Fiber Reinforced Polymer

Continuously reinforced concrete pavement (CRCP) does not require any contraction joints which is a high-performance pavement structure type that just need a sufficient number of reinforced pavement longitudinal configuration to constrain sideway random crack width. With continuous basalt fiber as reinforced material and synthetic resin as the matrix material and adding appropriate adjuvants, basalt fiber reinforced polymer (BFRP) bar form a new type of material after pultrusion processing and surface treatment technologies. BFRP on the mechanical properties were studied by two kinds of test methods which are using extensometer strain detection and fiber optic strain sensing and the parameter of homegrown BFRP bars mechanical properties. Because of the lower tensile elastic modulus of BFRP bars compared with rebar, the mechanical properties of basalt fiber-steel wire composite bar has been studied along with the research corrosion and flexural properties of BFRP bar.

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