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Aci Presentation Peter Hugheslarry


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This is the presentation I made at the 2008 ACI Fall Convention in St. Louis, USA. I came third in the Internation Student Project Competition.

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Aci Presentation Peter Hugheslarry

  1. 1. Macro synthetic fibre reinforced Concrete<br />Peter Hughes<br />BSc Building Surveying<br />University of Central Lancashire<br />2008<br />
  2. 2. Properties of Macro synthetic fibres and their composites<br />Outline experimental programme and discussion of results and conclusions<br />Applications<br />Agenda<br />
  3. 3. Local and central Government have committed £800 million in 2010<br />Our vision of the future of concrete should be on its longevity<br />Concrete can perform even under very severe conditions<br />DURABILITY<br />Background<br />
  4. 4. Fibre characteristics<br />Aspect ratio<br />
  5. 5. Polypropylene<br />Polypropylene is durable, stiffer than some other plastics, good resistance to fatigue, so that most plastic hinges, such as those on flip-top bottles, are made from this material.<br />Polyethylene<br />The first proposed application was in submarine telecommunication cables. One of the advantages of polyethylene fibre is that it can be produced with a relatively high modulus of elasticity.<br />Fibre Properties<br />
  6. 6. Positive effect on drying shrinkage cracking<br />Positive effect on plastic shrinkage cracking<br />Improves residual flexural strength in excess of 30%<br />Increased toughness, impact and abrasion resistance<br />Some MSF may be used as secondary reinforcement<br />Eliminating steel fabric removes the risk of chloride induced corrosion of reinforcement in marine applications.<br />Benefits<br />
  7. 7. Capillary Absorption/Vacuum saturation<br />Surface hardness<br />Ultrasonic pulse velocity<br />Compressive strength<br />S.E.M<br />Experiments<br />
  8. 8. The durability of concrete is one of the most important properties and the focus of attention in my paper. <br />The essence of my work was to discover the effects of adding the synthetic macro fibres and there effect on durability. <br />Durability<br />
  9. 9. Durability of concrete largely depends on the ease with which fluids, both liquids and gases, can enter into, and move through, the concrete.<br />Cracks must be avoided or controlled and minimized because they impair the durability and structural integrity.<br />Permeability<br />
  10. 10. Results<br />
  11. 11. Results<br />
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  13. 13. Sorptivity results suggest that the near-surface concrete was far more resistant to fluid ingress in the MSF mix than in the corresponding reference mixes. <br />The impermeability of the MSF demonstrated in the experiment, indicates good resistance to infiltration of solutions. This being an important property to achieve, especially in coastal structures when trying to limit chloride ingress.<br />Summary of main findings<br />
  14. 14. The rebound values for the MSF mix of a mean 30, are surprisingly low for a C40/50 mix. <br />The conversion curve on the hammer and Bungey imply a rebound number in the region of 30 indicates around 30MPa. <br />The compression test gives 50Mpa for the MSF at 56 days suggesting a r number of 40+, yet the number remains constant. This may be a result from the fact that the MSF are acting as impulse absorbers. <br />
  15. 15. UPV tests were most favourable in the OPC design mix. The MSF showed a much lower value. This may be due to the fibre content (dosages of 3.5kg/m3) and its effect on the pulse path being distracted in the sample.<br />
  16. 16. Blackpool Sea Defences<br />Brighton Sea Defences<br />Bristol Ave Recycling plant<br />Applications<br />
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  21. 21. Brighton sea defences<br />
  22. 22. Bristol Ave, Recycling depot<br />
  23. 23. Conclusions<br />
  24. 24. Concrete durability is significantly affected by its permeability, and the penetration of the aggressive liquids, frost action, and steel corrosion are all influenced by the concrete’s permeability. These problems have been decreased by reducing the permeability of the concrete sample. <br />This research presents the development and evaluation of MSF, and their favourable effect on the durability of concrete.<br />
  25. 25. Due to its high residual strength, it is the first synthetic additive truly capable of replacing its steel counterparts in terms of increasing the impact and fatigue qualities of concrete. <br />From Sulphate attack, Freeze/thaw damage, to salt crystallization, salt scaling, abrasion and marine growth, these chemical and physical predators will test the sea walls and concrete structures of our country to their limits. <br />
  26. 26. Future research<br />
  27. 27. Discussion contributions on this presentation<br />can be made via <br /><br /><br />Thankyou<br />