Dissertation > Excellent graduate degree dissertation topics show

Research on the Expansion Performance of Core Concrete Filled Steel Tube

Author: WangWei
Tutor: YangDeBin
School: Chongqing Jiaotong University
Course: Materials Science
Keywords: concrete filled steel tubes MgO expansion admixture percentage of expansion attringite brucite
CLC: TU528
Type: Master's thesis
Year: 2009
Downloads: 88
Quote: 3
Read: Download Dissertation

Abstract


Concrete filled steel tube is a combination structure by stuffed steel tube with concrete.The main reason for its excellent mechanical properties is the cooperating function between the steel tube and the core concrete.In order to achieve this aim,both of them must be combined closely.Due to the shrinkage of concrete and lack of curing water,the core concrete and the wall of steel tube are inclined to separate and form a cavum,may bring the hidden trouble.To solve the problem of concrete cavum, this paper researched the expansion performance of concrete at closure conditions.Effects of different water-binder ratio、water quantity and haydites on expansion performance of concrete have been studied.With actual enggering mix, effects of different binder materials on the expansion performance of concrete have been compared.Through experimental study, these conclusions could be got:(1)To the mortar, water-binder ratio within 0.31～0.33, exist best water-binder ratio to get max expansion ratio. The percentage of expansion will be improved with increasing water and mixing saturated haydite at low water-binder ratio,and will be reduced with increasing water at high water-binder ratio.Mixing saturated haydite won’t influence the percentage of expansion at high water-binder ratio.The expansion of low-heat portland cement is higher than rapid-hardening sulphoaluminate cement at all ages with the same amount of saturated haydite. The expansion of martar with II fly ash and S95 slag are similar.(2)The saturated haydite will improve the expansion of concrete, and followed by:large haydite>small haydite>general aggregate.(3)Comprehensive results of this study, the concrete made of low–heat portland cement concrete 30% saturated haydite and 8%MgO expansion admixture have better expansion property when concrete is curing at closure condition and the water-binder ratio is 0.31, and the expansion of concrete will have a sustained and stable development.(4)Curing conditions affect the expansion performance of concrete,so it is incorrect to use expansion ratio of concrete filled steel tube with curing in water and air,and the expansion performance of concrete filled steel tube should be judge by the expansion ratio of concrete with curing at closure conditions.

Related Dissertations

  1. Studies on Fiber Reinforced Silica Aerogel Super Thermal Insulation Materials Prepared by Ambient Drying Process,TB383.1
  2. The Research on the Anti-crack Cement Mortar Reinforced by Brucite Fibre,TU604
  3. Behavior of Concrete Filled Double-Skin Steel Tubular Beam-Columns,TU398.9
  4. Research on the Performance、Process and Application of Composite Fibers of Nometallic Minerals and Plant,TS72
  5. Use Brucite Hydrothermal amorphous magnesium hydroxide Crystals,O614.22
  6. Research on Expansive Performance of Expansive Agent in Steel Tube Concrete,TU528.042.4
  7. Aluminum hydroxide and brucite Powder Surface Modification,O611.3
  8. Investigation on the Preparation of Ultrafine Surface-modified Brucite Powders and Its Application in Polyester-matrix Material,TQ323.4
  9. Study of the Application of Fibre Brucite and Wollastonite in Paper Making Industry,TS72
  10. Analysis of Square Concrete Filled Steel Tube’s Mechanical Behavior in Finite Element Method,TU398.9
  11. Study on Ways to Improve Mould Plaster’s Performance,TQ174.6
  12. Application of Polyurethane/Phosphate Ester in Fire Retardant Polypropylene,TQ325.14
  13. Test Research on Shrinkage and Creep of Concrete Filled Steel Tubes on Long-span Arch Bridge,U448.22
  14. Brucite fiber concrete Fatigue Behavior,TU528
  15. Interface behavior of of brucite fiber reinforced concrete,TU528
  16. Brucite fiber reinforced cement concrete applied research,TU528.57
  17. Natural brucite surface treatment and its impact on low- halogen flame retardant ABS Research,TQ325.2
  18. Study on the Dispersion of the Fiber Brucite in the Concrete Pavement,U414
  19. The Research of the Engineering Mix Proportion of FB Concrete Applied in Road Cement Concrete,U414
  20. Post-fire Behavior Analysis on Square Concrete Filled Steel Column-Steel Beam Connections,TU398.9

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