International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Experimental Analysis of Behaviour of Joints in Fibre Reinforced Concrete Pavements Akhil S1, Priya Grace Itti Eipe2 Scholar, Department of Civil Engineering, SVNCE. and Head of the Department, Department of Civil Engineering, SVNCE, Kerala. ---------------------------------------------------------------------***--------------------------------------------------------------------2Professor
1PG
Abstract - The behaviour of the fiber reinforced concrete
Rigid pavements, though costly in initial investment, are cheap in long run because of low maintenance costs. Besides the easy availability of cement, concrete roads have a long life and are practically maintenance-free. Another major advantage of concrete roads is the savings in fuel by commercial vehicles to an extent of 14-20%. The fuel savings themselves can support a large programme of concreting. Cement concrete roads save a substantial quantity of stone aggregates and this factor must be considered when a choice pavement is made, Concrete roads can also withstand extreme weather conditions – wide ranging temperatures, heavy rainfall and water logging. Hence, though cement concrete roads may cost slightly more than a flexible pavement initially, they are economical when whole-lifecosting is considered. Fibre reinforced concrete (FRC) is defined as a composite material consisting of concrete reinforced with discrete randomly but uniformly dispersed short length fibres. The fibres can be made of steel, polymer or natural materials. FRC is considered as a material of improved properties and not as reinforced cement concrete where reinforcement is provided for local strengthening of concrete in tension region. Several research has been done on the use of fibre in concrete, Bentur and Mindess [1] (2007); Rossi, [2]; Banthia and Gupta [3]; Kanalli et.al, [4], for improving some specific properties of the concrete. The concept of using fibres in a brittle matrix was first recorded with the ancient Egyptians who used the hair of animals and straw as reinforcement for mud bricks and walls in housing, Balaguru and Shah, [5]. This dates back to 1500 B.C. Since in FRC, fibres are distributed uniformly in concrete, it has better properties to resist internal stresses due to shrinkage. As fibres improve specific material properties of the concrete, impact resistance, flexural strength, toughness, fatigue resistance, ductility also improves. Fibres generally used in cement concrete pavements are steel fibres, organic fibres like coir and jute, glass fibres, polymer fibres such as polypropylene and polyester, nylon fibre etc. Shah and Rangan [6], in their study on mechanical properties of FRC, conducted uni-axial compression test on fibre reinforced concrete specimens. The results showed an increase in strength of 6% to 17% compressive strength, 18% to 47% split tensile strength, 22% to 63% flexural strength and 8% to 25% modulus of elasticity respectively. Byung Hwan Oh [7], studied about the mechanical properties of concrete. The results showed an increase in strength of 6% to 17% compressive strength, 14% to 49% split tensile
pavement was analyzed in this study by means of experimental tests. Slabs connected by a dowel bar representing a pavement joint system were used for testing. Steel, polypropylene and coir fibers were used in the study. After analyzing the fresh and hardened concrete properties of each type of specimens, their optimum fiber dosage were found. Concrete slabs were then made with optimum dosage of each fiber and also with control mix were tested. For measuring the vertical deflections, two LVDT’s were used. Steel fiber was found to be the strongest followed by coir and polypropylene. FRC specimens were found to be stronger than control specimen, transfer load effectively and reduce crack formation. Reduced cracks ensures pavement durability, reduced maintenance, improved performance and ride quality. Key Words: FRC, Steel fibre, Polypropylene fibre, Coir fibre, Rigid pavement, Construction joint
1. INTRODUCTION A long lasting, reliable and economical transportation system is a critical component for the continuous movement of goods and services. Extensive research on highway pavements is needed to address current problems as well as develop new designs and techniques for future pavement applications. Bitumen has been widely used in the construction of flexible pavements for a long time; however, due to high temperature in summer season, the bitumen becomes soft resulting in bleeding, rutting and segregation finally leading to failure of pavement. In winter season, due to low temperature, the bitumen becomes brittle resulting in cracking, ravelling and unevenness, which makes the pavement unsuitable for use. In rainy season, water enters the pavement resulting in potholes and sometimes total removal of bituminous layer. In hilly areas, due to sub-zero temperature, the freeze-thaw cycle takes place. Due to freezing and melting of ice in bituminous voids, volume expansion occur. This leads to pavements failure. India imports nearly 70% of the petroleum crude from which bitumen is obtained and the continuous rise in cost of bitumen is a serious problem faced by the construction industry. The demand for bitumen in the coming years is likely to grow steeply, far outstripping the availability. Hence, it will be in India's interest to explore alternative binders. Cement is available in sufficient quantity in India. Thus, cement concrete roads should be the obvious choice in future road programmes.
Š 2017, IRJET
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