TENSILE STRENGTH OF FIBER REINFORCED SOIL

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Information about TENSILE STRENGTH OF FIBER REINFORCED SOIL

Published on December 12, 2016

Author: VibhanshuSingh5

Source: slideshare.net

1. TENSILE STRENGTH OF FIBER REINFORCED SOIL 1

2. OVERVIEW • Introduction about fiber reinforcing of soil and material used. • It’s advantage and application. • Tensile and desiccation test for given soil and fiber properties. • Result and discussion. • Effect of fiber content, dry density and water content. 2

3. OVERVIEW • Relationship between tensile strength and interfacial shear strength. • Conclusion. 3

4. INTRODUCTION • What is fiber reinforced soil? The standard fiber-reinforced soil is defined as a soil mass that contains randomly distributed, discrete elements, i.e. fibers, which provide an improvement in the mechanical behavior of the soil composite. Source: (http://newsroom.uts.edu.au) 4

5. Why soil-reinforcing is essential? • The primary purpose of reinforcing soil is: To improve stability To increase bearing capacity To reduce settlement To reduce lateral deformation source: (http://www.authorstream.com) 5

6. APPLICATIONS • It has several field application Retaining wall Abutment Embankment Dam Hill road source:(http://www.authorstream.com) 6

7. source:(http://www.authorstream.com) 7

8. MATERIAL AND ITS PROPERTIES • This is case study done by Dr. Chaosheng Tang . • The soil used in the experiment is collected from the Nanjing area of eastern China. • Optimum water content in soil is 16.5% and dry density is 1700 kg/m3. • The used polypropylene fiber length is 12 mm and diameter is 0.048 mm (as reinforcement). 8

9. 9 Soil Properties Values Specific gravity 2.73 Consistency limits: Liquid limit (%) 37 Plastic limit (%) 20 Plasticity Index (%) 17 USCS Classification CL Compaction Study: Optimum moisture content (%) 16.5 Max. dry density (kg/m3) 1700 Grain Size Analysis Sand (%) 2 Silt (%) 76 Clay (%) 22

10. 10 Fiber Properties Values Specific gravity 0.91 Average diameter(mm) 0.048 Average length (mm) 12 Breaking tensile strength (MPa) 350 Modulus of elasticity (MPa) 3500 Fusion Point (0C) 165 Burning Point (0C) 590 Acid and alkali resistance Very good Dispersibility Excellent

11. SPECIMEN PREPARATION • Air dry the soil (w=4.16%) and pass through 2 mm sieve size. • Add water to soil and finally mix the fibers manually. • This way specimen of four different water content and five different fiber content were prepared. (w = 14.5%, 16.5%, 18.5% and 20.5%) (f = 0%, 0.05%, 0.1%, 0.15% and 0.2% by weight of dry soil) 11

12. TENSILE TEST • Prepare specimen using the 8-shaped compaction mould. (80 mm long and 10 mm high) and required dry density of 1400,1500,1600,1700 kg/m3 is achieved. • Take out the specimen from the compaction mould and place in the tensile mould. • Connect the lower part of mould to the load plate of testing machine and upper to a load crossbeam through a load transducer (capacity 100N ). 12

13. (Source: journal ascelibrary.org) 13

14. (Source: journal ascelibrary.org) 14

15. • Conduct the test at constant rate of 0.5 mm/min of vertical displacement. • Note down the reading of load and corresponding displacement reading. • The tensile strength is calculated using :

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