Papers by Keyword: Steel Fiber

Abstract: Upcoming infrastructure and maintenance focuses on sustainable infrastructure. To solve this, certain cement – based materials are developed. Engineered Cementitious composite (ECC) has been developed as an improved version of Fiber Reinforced Cement. The most outstanding properties of ECC are its high tensile ductility and fine multiple cracking. It is basically a composite similar to mortar added with fine fibers such as steel fibers and polymer fibers. A composite with high ductility is made retaining the original properties of normal concrete leads to a sustainable and serviceable construction. The materials used for ECC are cement, fly ash, fine cement, admixtures, fibers and water. Sand used in this mix is very fine which have 0.1mm dia. The fibers used in this study are polypropylene and steel fiber. Fibers are added at the rate of 0.5%, 1%, 1.5%, 2% volume of cement. This paper deals with the experimental investigation of compressive strength, tensile strength, and flexural strength of ECC made with polypropylene and a mixed proportion of polypropylene with steel fiber with different volume percentages i.e., 2%, 1.5%, 1% and 0.5%. It is observed that addition of fibers increased the ductile behavior. ECC with polypropylene fiber had shown significant improvement in tensile and flexural strength while ECC with hybrid fiber had given appreciable compressive strength development. These efforts will focus on the development of sustainable green material, which reduces the negative impact of existing concrete on the environment. The potential application of ECC to achieve structural sustainability has been observed from the results obtained.

Abstract: Slurry Infiltrated Fiber Reinforced Concrete (SIFCON) is a relatively new high performance and advanced material and can be considered as a special type of Steel Fiber Reinforced Concrete (SFRC). The hooked-end shape steel fiber assist in controlling the propagation of cracking in the matrix by improving the overall cracking resistance and by bridging across even smaller cracks. In this paper, the comparison between the steel fiber reinforcement and BRC wire mesh will obtain and also between the different thickness size. The steel fiber will use from different percentage based on volume frictions which are 0.5%, 1% and 2% with aspect ratio 67. The beam is tested for flexural strength. The relationship between loads versus deflection represented graphically. The highest flexural strength obtained in this research is 19.34 MPa with 2% volume friction of steel fiber.

Abstract: Ordinary Portland Cement (OPC) has been used over the than hundred years for material construction especially as a binder in production of concrete. However, there are a few disadvantages with the using of OPC that have been found especially in terms of properties and green house effect. This paper reviews the potential of an alternative binder material with no cement usage (cementless) called as “geopolymer”. The history of the development geopolymer will be described. Different types of base materials used in the formation of geopolymer will be explained in details. The influence of different types of fibres to the mechanical properties especially compressive strength and flexural strength were explained well.

Abstract: The results show the effect of polymer modification on the behavior of Ca (OH)₂ in steel fiber reinforced concrete. The polymer modified concrete were prepared using acrylic emulsion polymer at various polymer-cement ratios; they were tested for mechanical strengths, moulded into specimens and cured. The cured specimens were subjected for compressive strength, flexural strength, splitting tensile strength and modulus of elasticity. The small specimens that moulded were subjected to X-ray diffraction (XRD). From the test results, it is concluded that formation of Ca (OH)₂ in the polymer modified concrete reinforced with steel fiber is reduced possibly because of the absorption of Ca (OH)₂ on polymer films formed in the concrete. The extent of reduction in the quantity of Ca (OH)₂ depends upon the polymer-cement ratio, polymer type or both. Generally SFRPMC of mix 43 with 2.5% polymer-cement ratio were found to be more effective than other SFRPMC with 1.0% and 4.0% acrylic emulsion polymer in reducing the quantity of Ca (OH)₂ in SFRPMC. The cement modifiers did not cause any detrimental effect on the degree of hydration as in SFRPMC therefore, does not provide a proper means for predicting their degree of hydration.

Abstract: The steel fiber/graphite conductive concrete is applied in power system grounding. In high soil resistivity regions, the common methods for reducing the grounding resistance are not practical. It is difficult for grounding resistance of substations to meet the requirements of working earthing and safety earthing. In order to solve this problem, a steel fiber/graphite conductive concrete is developed in this paper. Steel fiber and graphite are added as conductive fillers. The long-term stability of the steel fiber/graphite conductive concrete is studied. The experiment results show that steel fiber/graphite conductive concrete not only maintains excellent conductivity, but also has good mechanical strength and corrosion resistance in 300 days.

Abstract: Nowadays, demands in the application of fiber in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction of ribbed slab reduces the material and thus the cost but the strength of the structure also reduce due to the reducing material. This paper will focus on modelling behavior of ribbed slab reinforced with steel fibre using Lusas Modeller. The structure design is in full aspect to optimize the function of steel fibre and the slab rib capability. This research focus on modelling of multiple type of steel fibre ribbed slab consist of two ribbed slab, and also three ribbed slab in similar size of 1500mm x 1000mm x 75mm using concrete Grade 30. Load was applied until failure under three point loading system. It is importance to find the ultimate strength of the sample and the behavior of structure under vertical stress. Steel fibre is expected to reduce the issue of micro crack and enhance the performance of concrete.

Abstract: The present study deals with the usage of two types of metallic reinforcements namely bronze and steel, one natural reinforcement namely jute and an artificial reinforcement namely glass for preparation of composite laminates. The study investigates the mechanical behaviour of prepared samples and concludes with the selection of best samples. Four composite laminates were prepared by changing the compositions of reinforcements in polyester resin. Tensile, compressive, flexural and impact tests were carried out on the developed samples and it was found that the inclusion of jute and metallic reinforcements improved the compressive and impact strengths of the composite whereas inclusion of jute and glass improved the tensile and flexural strengths of the composite.

Abstract: The aim of this presentation is to recommend an economical technique for preparing fiber-reinforced mortar for blast resistant structures using polymer fibers. Fiber-reinforced concrete was developed to improve ductility by preventing micro-cracking. It is also used to strengthen blast resistant structures, and to prevent spalling under the fire conditions. Because of the better mechanical properties and bonding performance, metal fiber is mainly used for the blast resistant structure. However, because of the high cost of the fiber, the cost of the reinforced cementitious composite is higher than normal concrete. This is especially true for short steel fiber where its high cost has to be weighed against its outstanding performance. As a solution, a more economical substitute can be found in polymer fibers of nylon and polyvinyl alcohol fibers, which cut costs without a significant decrease in performance. In this study, for fiber-reinforced mortar, each fiber and combination of fibers incorporated made up 1% to the total volume of the mortar. For fresh state properties, although the mortar contained combined fibers, there was no significant decrease in flow and air content. As the polymer fibers were combined with steel fibers, approximately 35% of tensile strength and 12% of flexural strength decreased. However, from the strain-stress relationship, the fiber-reinforced mortar with combined fibers showed more favorable results than single steel fiber. The results of this study are expected to contribute on the economic approach of fiber-reinforced cementitious composites using combined fibers.

Abstract: Ferrocement plate with steel meshes incorporating fibers in an identical matrix were tested under bending. The main objective of the study was to investigate the effects of combining reinforcing steel meshes with discontinuous fibers as reinforcement in thin mortar matrix. The variable parameters were chosen as (a) number of mesh layers, single and double (b) the types of fiber i.e steel and polyethylene terephthalate (PET). Everything else being equal, the test results shows that addition of steel fibers to the matrix of ferrocement can effectively increase its flexural strength and energy absorption to failure. Cracking and spalling of mortar cover also significantly reduced. On the other hand, the contributions of same volume fraction of PET fibers are not significant compared to steel. However, addition of PET fibers control the early cracking of thin mortar and showed slight improvement in flexural strength and energy absorption to failure compared to control specimens. Reinforcing ferrocement plates incorporating steel or PET fibers is recommended for providing technical and economical advantages as no negative effect was observed.

Abstract: Currently in concrete technology a lot of materials were introduced to improve the quality and properties of concrete. Additional materials include the use of steel fibers into the concrete mix. With the used of steel fibers, it can enhance the strength of the concrete. In this research, two parameters will be investigated which is the volume friction of the steel fiber and the length of the steel fiber. End-hooked steel fiber with the length of 33 mm and 50 mm and the percentage of steel fiber 0.5 %, 1.0 % and 1.5 % used in this research. The size of the mold used is 100 mm x 100 mm x 100 mm. The characteristics during the fresh concrete were also investigated by conducting the slump test, compaction test and vebe test. All the samples has been cured in the water for 7^th, 14^th and 28^th days for the compressive strength test. Based on result, it was concluded that the optimum percentage of steel fiber in this report was 1.0 % for the end-hooked steel fiber with 33 mm length which provided the highest compressive strength at 28 days.