Dissertation > Excellent graduate degree dissertation topics show

Preparation and Basic Performance Studies of Hybrid Copper Covering Steel-PVA Fiber-reinforced Reactive Powder Concrete

Author: ChenZuo
Tutor: WuYongHua
School: Xi'an University of Architecture and Technology
Course: Building Materials
Keywords: reactive powder concrete hybrid fiber reinforcement mineraladmixtures splitting tensile test
CLC: TU528
Type: Master's thesis
Year: 2012
Downloads: 63
Quote: 0
Read: Download Dissertation


As a delegate of high-performance concrete, reactive powder concrete(RPC)hasbeen born for nearly30years, yet as a result of its high cost, and the rigorous requestof materials, its application in China is limited. Therefore, for the purpose of reducingits cost and optimizing its performance, RPC may be better and broad used instructures, the method of preparing it and its basic performance are investigatedthrough two ways, improving the performance of matrix and using fibers to reinforceit.Firstly, on this basis of the developments of theories of fiber-reinforced concrete,the current situation of RPC(reactive powder concrete), as well as the hybridfiber-reinforced concrete being introduced in this paper, the effects of followingfactors to the strength of RPC are investigated as follows. The ratio of sand andcement, different proportions of sodium sulfate, curing temperature, as well as theaddition of silica fume, fly ash, and grounded furnace slag. The results show that, thebest ratio of sand and cement is1.1:1. Better grain gradation would cause higherstrength. The highest acceptable dosage of sodium sulfate is1%, otherwise the matrixmay be swelled. The fume ash is beneficial to the water retention, and addingappropriate proportions of fly ash and grounded furnace slag can not reduce thestrength of RPC but can improve the workability. According to experiments, a highcompressive strength of181MPa can be gained. Secondly, the reinforcing effects of adding single kind of fiber (copper coveringsteel and PVA) and hybrid fibers are studied through experiments. Thefiber-reinforcement mechanisms, destroyed pattern of fiber-matrix, and the positiveinteractions of two kinds of fiber are investigated too. On the balance of mobility,strength, and economical factors, the optimal mixing ratios are selected as follows.PVA with the length of6mm and copper covering steel fiber shall be chose as1%and1.5%by volume respectively. When it comes to PVA with the length of12mm andcopper covering steel fiber, the volume fraction of PVA should not exceed1%, and theoptimal volume fraction of copper covering steel fiber is1%.Finally, four types of concrete, RPC without fibers, PVA fiber-reinforced RPC,copper covering steel fiber-reinforced RPC and PVA&copper covering steel fiber-reinforced-RPC are compared by splitting tensile test. The results indicate that, RPCmatrix is high in compression strength but low in tensile strength, after beingreinforced by fibers, the toughness of it can be enhanced. PVA fiber is better inincreasing the compression strength than tensile strength, and copper covering steelfiber can increase the toughness of matrix remarkably. Moreover, the hybrid fiberreinforcement is better than single kind of fiber, and the proportion depends on needs.

Related Dissertations

  1. Research and Application of Non-Steam Curing Reactive Powder Concrete,TU528.31
  2. Study on the Performance of RPC Two-way Ribbed Slab,TU375
  3. Study of the Calculating Method of Crack Resistance and Flexural Capacity for Rectangular Reinforced RPC Beam,TU311.4
  4. Experimental Research on Fire Performance of Steel Fiber Reactive Powder Concrete,TU528
  5. Research on Flexural Mechanical Property of Slab Made of Reactive Powder Concrete,TU528.57
  6. Study on the Properties of Reactive Powder Concrete with Ultrafine Slag,TU528
  7. Durability Research of Reactive Powder Concrete in Marine Environment,TU528
  8. Research on High Pressure Equation of RPC,TU528
  9. Study of Design and Experiments on 32m Prestressed Reactive Powder Concrete T-beam for Railway,U448.212
  10. Study on Durability of Reactive Powder Concrete after Damage,TU528.31
  11. Study on Oblique Section Shear-bearing Capacity of RPC Beam Based on Softened Truss Theory,U441
  12. The Influence of High Temperature on Explosive Spalling Behavior and Mechanical Properties of Reactive Powder Concrete,TU528
  13. The Research and Its Application for Steel Fiber Reinforced Sprayed Concrete Using in Tunnel Initial Supporting,TD353
  14. Polyacrylate reactive powder concrete performance,TU528
  15. Study on the Impact Compressive Behavior of Reactive Powder Concretes,TU528.572
  16. Steel - Reactive Powder Concrete Composite Beams Performance,U441.5
  17. Experimental Study for the Basic Performance of the Basalt Fiber Reactive Powder Concrete,TU528
  18. The Durability of Reactive Powder Concrete under the Coupling Effect of Sulfate Dry-wet and Freeze-thaw,TU528.31
  19. Experimental Study on the Mechanical Properties and Explosive Spalling of Reactive Powder Concrete Exposed to High Temperatures,TU528
  20. Preparation and Properties of Fibers Modified Reactive Powder Concrete Protection Engineering Material,TU528
  21. Numerical Analysis of Rheological Properties of Reactive Powder Concrete,TU528

CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
© 2012 www.DissertationTopic.Net  Mobile