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Behavior of Plastic Fibers in Concrete

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Added on  2019-11-12

Behavior of Plastic Fibers in Concrete

   Added on 2019-11-12

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Behavior of Plastic Fibers in Concrete1 BEHAVIOR OF PLASTIC FIBERS IN CONCRETEBy NameCourseInstructorInstitutionLocationDate
Behavior of Plastic Fibers in Concrete_1
Behavior of Plastic Fibers in Concrete2Abstract Fibers exist of very many types and often they are utilized in concrete purposefully to assist in preventing microcracking which occurs as a result of shrinkage. The most common type of fibers which are utilized are the polypropylene fibers. These microcracks should be avoided at allcosts since if they are not taken into keen attention they may end up in the growth of steeper cracks due to the process of drying shrinkage. Theses steeper cracks enable the permeation of destructive materials from the environment thus limiting the strength and lifespan of structures which are concrete in nature[CITATION Har16 \p 643 \l 1033 ]. The main aim of this research is to determine the behavior of plastic fibers in concrete. Fibers play a significant role in the prevention of deformations in concrete elements. Various roles played by fibers in concrete have been explained. Besides, the benefits of plastic fibers over other fibers for the reinforcement of concrete have also been presented. In conclusion, plastic fiber offers the best characteristics in terms of the following factors and should, therefore, be conventionally recommended.Introduction Various fields including science and construction industry have been greatly attracted by the Useof plastic fibers to strengthen concrete as compared to other types of steel. This paper has analytically presented the present state of information and technology of adopting plastic fibers to reinforce concrete. A detailed review of the effects of plastic fibers on the fresh and hardened concrete properties have also been covered in this paper[CITATION Mel09 \p 552 \l 1033 ].Among the many reasons for the occurrence of cracks, ion concrete elements are the deformationas a result of shrinkage. The concrete elements vary ranging from pavements, overlays and even
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Behavior of Plastic Fibers in Concrete3slabs. Polypropylene fibers in most cases help to improve the cement based composites which are more vulnerable to shrinkage. The deformations may be caused by very many factors such as restrained shrinkage, autogenously and also increased composite resistance.In the first 12 hours of concrete shrinkage, the plastic fibers reduce and lessen the presence of cracks by harnessing the strength and capacity of the cement paste[CITATION Den08 \p 844 \l 1033 ]. When these cracks are not controlled, the small tiny cracks formed due to the drying shrinkage results in the growth of larger cracks. The fibers also help in reducing the width of the cracks thereby preventing harmful substances from the environment from penetrating. Generally, the control of cracksis vital for the advancement of more durable and long-lasting structures. Literature review Fiber Reinforced Concrete that contains a tough material enhances the structural integrity of the concrete due to the uniformly distributed fibers. There are two Types of Fibers which include the;• Steel Fibers • Synthetic Fibers- this includes the plastic fibers. These Fibers are primarily used in concrete for the below purposes; For the prevention of cracking which forms as a result of both drying and plastic shrinkage[CITATION fib07 \p 322 \l 1033 ]. Besides, the fibers help to enhance the robustness of the concrete.
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Behavior of Plastic Fibers in Concrete4Fibers also help to limit the penetrability of the concrete and thereby lessening water leakage during construction.Advantages of Fiber Polypropylene and Nylon Fibers –these type of fibers are mostly applied due to their property of improving the mixing cohesion and also the ability to pump over longer distances. They also exhibit the property of increasing the resistance that results from freeze-thaw or explosive palling during incidents of severe fire .for this reason, these fibers have been internationally recommended since apart from offering protection to the concrete it also helps to protect lives and property[CITATION Dav16 \p 985 \l 1033 ]. Steel Fibers- these type of fibers also are advantageous in terms of Improving the structural strength of concrete and Reducing the size of the cracks by firmly holding and in turn promoting its durability •nevertheless, steel fibers Improves abrasion resistance and freeze-thaw resistance[CITATION Noe15 \p 548 \l 1033 ] Role of fibers The process of crack formation in concrete elements plays a key role since it constantly exposes the structures to a high risk of corrosion. Theses crack lower the quality of the concrete, therefore, affecting their durability and also their aesthetic value. Hence there is a need to minimize the size of these cracks and more particularly this is achieved with the addition of plastic fibers. There are various reasons behind the formation of these cracks including; Fire damage, plastic shrinkage, freeze-thaw damage and also plastic settlement as discussed below.
Behavior of Plastic Fibers in Concrete_4

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