To Study the Properties of Polypropylene Fibers on Fresh & Hardened Stage of Concrete (original) (raw)
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Effects of Polypropylene Fiber Content on Strength and Workability Properties of Concrete
Polytechnic Journal
Low tensile strength of plain concrete is due to the inherent presence of microcracks due to drying shrinkage occurrences or other causes of volume changes in concrete. The addition of a proper amount of fibers to concrete would act as crack arrester thus improves its static or dynamic properties. In this paper, the concrete with different amount of polypropylene fiber was investigating to find out the fibers effect on its fresh and mature properties. A plain concrete mix (reference mix) prepared for comparison purposes. Nine concrete mixes were prepared with different fiber volume fraction (FVF) ranging from 0.06% to 2.16%. It has been found out that the fiber content of the concrete mix will increase compressive, splitting, and flexural strengths of the concrete at the age of 28 days. The strengths increased and reached their maximum value at a corresponding (FVF) of about 0.36%. In comparison with the reference mix, the increase in the maximum compressive strength was about 18%, ...
Improvement of compressive and tensile strengths of concrete using polypropylene fibers
2015
The most common problems appears on concrete are manifested by tearing, cracking, corrosion and spalling, which will lead to do some defect in concrete then in the whole construction, The fundamental objective of this research was to provide information about the hardened properties of concrete achieved by using easily available local raw materials in Jordan to support the practical work with partners in assessing the practicability of the mixes with polypropylene, and to facilitate the introduction of polypropylene fiber concrete (PFC) technology into general construction practice. Investigate the effect of the polypropylene fibers in PCC mixtures and on materials properties such as compressive strength, and tensile strength. Also to investigate the use of polypropylene fibers in plain cubes and cylindrical concrete to improve it's compressive and tensile strengths to reduce early cracking and inhibit later crack growth. Increasing the hardness of concrete in this research is t...
Effects of polypropylene fibre on the compressive and splitting tensile strength of concrete
2018
Concrete is a versatile construction material comprising of cement, aggregates, water and occasionally admixture. It is very good in compression and weak in tension. To complement for the deficiency in the tensile zone; cracks, reinforcements (steel, fibre, etc.) have been found suitable. A good example of fibre is polypropylene. A concrete grade (M20) was batched and synthetic fibre (polypropylene) was used. Two categories of concrete specimens; with and without propylene fibre. The fibre was introduced in varying percentages (0.2%, 0.4%, and 0.6%) by weight of concrete. The compressive strength of concrete containing 0.4% polypropylene fibre at 28 days has the highest value of 32.22N/mm 2 as compared to 30.22N/mm 2 , 30.49N/mm 2 and 30.39N/mm 2 for 0%, 0.2%, and 0.6% respectively. The splitting tensile strength at 7 days increases from 6.176 N/mm 2 to 8.386 N/mm 2 as the percentage of fibre increases from 0% to 0.4%.
International Journal of Scientific Research in Science, Engineering and Technology, 2019
The paper deals with the effects of addition of various proportions of polypropylene fiber on the properties of high strength concrete m20 mixes. An experimental program was carried out to explore its effects on compressive strength under different curing condition. the main aim of the investigation program is to study the effect of polypropylene fiber mix by varying content such as 0%, 0. 5%, 1%, 1. 5%, 2% and find the optimum polypropylene fiber content. the concrete specimen were tested at different age level for mechanical properties of concrete name compressive strength of the concrete. a detailed study was carried out of curing conditions. the increase were compressive strength
Influence of Polypropylene Fiber on Strength of Concrete
The present day world is witnessing the construction of very challenging and difficult civil engineering structures. Quite often, concrete being the most important and widely used material is called upon to possess very high strength and sufficient workability properties. Researchers all over the world are attempting to develop high performance concretes by using fibers and other admixtures in concrete up to certain proportions. Hence, in this paper was interested in finding out the optimum quantity of polypropylene fibers required to achieve the maximum compressive strength for M25 grade concrete. From the exhaustive and extensive experimental work it was found that with increase in polypropylene fiber content in concrete there was a tremendous increase in compressive strength. Even at 2 % polypropylene fiber content compressive strength of 28 N/mm 2 was observed against compressive strength 25 N/mm 2 at 0 % hence increase of 12 % compressive strength was obtained.
Optimal Polypropylene Fiber Content for Improved Compressive and Flexural Strength of Concrete
IOSR Journal of Mechanical and Civil Engineering, 2014
Worldwide, concrete is a very important construction material, impacting heavily on Gross Domestic Products of many nations: a $30 billion business for ready-mix concrete production industry per year in the United States and a cement consumption rate of about 106kg per person in Nigeria. It is therefore imperative that this important material in the world construction industry must also be endued with the best possible properties. The principles on which reinforced concrete structural designs were based hangs on quality concrete material used in conjunction with quality steel or reinforcing material. However, in Nigeria, the reinforcement steel commonly used is of poor qualities as recent researches have shown that over 40% of 12 mm and 16 mm used within Lagos in 2010 failed the 460N/mm 2 yield strength bench mark of BS8110 of 1997. The employment of micro fibers in the concrete will improve the strength and compensate for the apparently declining strength of Nigerian reinforced concrete building constructions and will also improve the strength of the non-reinforced concrete-sand crate block buildings. This research studies the effects of micro synthetic polypropylene fiber in improving concrete strength with the main focus of identifying the optimal quantity for improved compressive and flexural strengths of concrete. Destructive and non-destructive compressive strength tests and destructive flexural strength tests were carried out on the samples built with 0.25%, 0.5% 0.75% and 1% contents of polypropylene fibers alongside a control samples after 7, 14, 21 28 days of curing. The optimal percentage of polypropylene fiber that produced improved compressive and flexural strengths were found to lie within 0.25% and 0.5%.
Evaluating Mechanical Properties of Concrete by Adding Polypropylene Fibers.
2020
This research deals with the effect of Polypropylene Fibers on the properties of concrete. Polypropylene fibers are synthetic fibers which possess high tensile strength, high modulus of elasticity and also good bonding when added to concrete. In this research work, Polypropylene fibers of two different length 6mm and 12 mm were added to concrete in different proportions and then the performance of concrete in terms of strength and cracks propagation were analyzed. For this purpose, three batches of FRC (Fiber reinforced concrete) and one batch of PC (Plan concrete) were made. PC (Plan concrete) sample was used a bench mark with which the other FRC concrete composite were compare in terms of strength and performance. FRC-1 concrete composite contained 50% 6mm length of Polypropylene fibers and 50% 12mm length of Polypropylene fibers. FRC-2 concrete composite had 75% 6mm length of Polypropylene fibers and 25% 12mm length of Polypropylene fibers. Similarly, FRC-3 Concrete contained 25% 6mm length of Polypropylene fibers and 75% 12mm length of Polypropylene fibers. Large number of samples were prepared in laboratory and tests were carried out at the curing age of 28 days. Several laboratory tests were done on the concrete samples such as compression test, split tensile test, modulus of rupture and pure shear test. After analyzing the data from laboratory tests and experiments, it was evident that the performance of concrete in term of strength and cracking behavior were improved after the adding of Polypropylene fibers.
Performance of Polypropylene Fibre Reinforced Concrete
The paper deals with the effects of addition of various proportions of polypropylene fibers on the properties of High strength concrete (M30and M40 mixes). An experimental program was carried out to explore its effects on compressive, tensile, flexural strength under different curing condition. The main aim of the investigation program is to study the effect of Polypropylene fiber mix by varying content such as 0% ,0.5%,1%,1.5% & 2% and finding the optimum Polypropylene fibre content. The concrete specimens were tested at different age level for mechanical properties of concrete, namely, cube compressive strength, split tensile strength, flexural strength. A detailed study was carried out for curing conditions. Half of the concrete specimens were left exposed to the surrounding to cure by themselves and the remaining half were cured in a curing tank. Initially the concrete specimen's shows appreciable strength for irregular curing but as the days advances the curing specimens gave satisfactory strength. A notable increase in the compressive, tensile and flexural strength was observed. However, further investigations were highly recommended and should be carried out to understand more mechanical properties of fibre reinforced concrete.
AN EXPERIMENTAL INVESTIGATION ON STRENGTH PROPERTIES OF POLYPROPYLENE FIBERS
Concrete made with Portland cement has certain characteristics: it is relatively strong in compression but weak in tension and tends to be brittle. These two weaknesses have limited its use. Another fundamental weakness of concrete is that cracks start to form as soon as concrete is placed and before it has properly hardened. These cracks are major cause of weakness in concrete particularly in large on site applications leading to subsequent fracture and failure and general lack of durability. Plain, unreinforced concrete is a brittle material, with a low tensile strength and a low strain capacity. The role of randomly distributes discontinuous fibers is to bridge across the cracks that develop, provides some post – cracking “ductility”. Fiber reinforced concrete (FRC) may be defined as a composite materials made with Portland cement, aggregate, and incorporating discrete discontinuous fibers. In this experimental investigation, an attempt has made to find out strength related tests like Compressive Strength, Split Tensile Strength, Flexural Strength using PolyPropylene Fibers with to volume fraction of 0.5% and 1% and for aspect ratio and considered for M50 Grade of concrete. A total No.of 40 specimens were casted, cured and tested. The real contribution of the fibers is to increase the toughness of the concrete, under any type of loading and permit the fiber reinforced concrete to carry significant stress over a relatively large strain capacity in the post cracking stage. The results of the tests showed that the strength properties are enhanced due to addition of fibers.
Influence of Polypropylene Fibres on Concrete Properties
IOSR Journal of Mechanical and Civil Engineering, 2016
This paper deals with the influence of addition of various proportions of polypropylene fibres on the properties of fresh and hardened concrete. The objective of this study is to find optimum percentage of Polypropylene fibre content between 0.1% and 0.5% by volume of concrete. An experimental program was carried out to explore its effects on fresh and hardened concrete properties. The slump test was conducted for fresh properties of concrete, also concrete specimens were tested at different age level for mechanical properties of concrete, namely, compressive strength, split tensile strength, flexural strength and modulus of elasticity. The results showed that the workability of concrete decreased with the addition of polypropylene fibres. Results also showed a reduction in modulus of elasticity after 28 day when compared to the reference concrete i.e. without fibre. An increase in flexural strength at 0.5% percentage of polypropylene fibre reinforced concrete was observed when compared to the reference concrete. Also a marked increase in splitting tensile strength was observed for all fibre percentages at 28 day.