1 / 71

U nited A rab Emirates U niversity F aculty of E ngineering

U nited A rab Emirates U niversity F aculty of E ngineering. Design Concrete Mixture Incorporating SCM Graduation Project (II) Advisor :- Dr. Amr. El- Dieb Coordinator : -   Dr. Tamer El Maaddawy Fahd Saeed Shehhi 200512722 Talal Ahmed Shehhi 200510258

chimalsi
Download Presentation

U nited A rab Emirates U niversity F aculty of E ngineering

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. United Arab Emirates University • Faculty of Engineering • Design Concrete Mixture Incorporating SCM Graduation Project (II) Advisor :- Dr. Amr. El-Dieb Coordinator : -  Dr. Tamer El Maaddawy Fahd SaeedShehhi 200512722 Talal Ahmed Shehhi 200510258 Khalid Al Hammadi 200507181 Saeed Al Ajmi 200440229 2010 Spring

  2. Outline

  3. 1- Introduction

  4. Introduction (1/2) • Huge trend in the construction all over the world has proved the necessity of additives materials (SCM). • New challenges created by innovative engineers with spectacular designs of the structures ( BurjKhalifa ).

  5. Introduction (2/2) • SCM must be used to enhance the quality of the concrete. • Raise new concerns regarding their impact on the economy and environment.

  6. Purpose for this project • To establish a better understanding for fully utilizing of these materials in concrete production. • Optimizing the percentage of replacement of ordinary Portland cement with the suitable SCM to achieve the required properties.

  7. Objectives • To apply concrete mixture design to concrete mixes with variable qualities. • Incorporating supplementary cementing materials (SCM) to further investigate their utilization in advanced application. • To be able to handle real life implementation and application of concrete incorporating SCM.

  8. 2- Summary of Achievements in G.P1

  9. Supplementary Cement Material (SCM) • Materials that when used in conjunction with Portland cement contributes to the properties of hardened and fresh concrete through hydraulic or pozzolanic activity. • Typical examples are: • Fly Ash. • GGBS. • Silica Fume. • Metakaolin.

  10. Proposed Conceptual Designs • Plan for casting 18 different mixes. • 108 cubes (10x10x10cm) are required for compressive strength test at 7, 28. • Also, we have planned to cast 18 cubes (15x15x15cm) for the resistivity test. • 36 cylinders (10x20cm) for RCPT.

  11. Selected Conceptual Design (1/3) • We have reduced the mixes to be only 12 mixes. • For instance, regarding the Fly Ash we are only concerned about High Volume Fly Ash (HVFA). • The practical amount for GGBS was between 30% and 75%, and we have decided to go up to 90% to examine its effects.

  12. Selected Conceptual Design (2/3)

  13. Selected Conceptual Design (3/3)

  14. Final Deliverables • In GP I, we have studied the properties of SCM. • In GP II, we have conducted experiments to asses the mixtures in order to: • Emphasize on the significant role of reducing the amount of cement by using SCM. • Achieving green environment.

  15. Preliminary Cost

  16. 3- Updated Background Theory

  17. Resistivity (1/3) Ability of the concrete to resist the flow of current especially the corrosion current associated with reinforcement corrosion.

  18. Resistivity (2/3) Copper plate Ohm meter Sponge

  19. How to Calculate Resistivity (3/3) • Diameter = 10 cm • Thickness = 5 cm

  20. RCPT Test Stands for Rapid Chloride Permeability Test. This name is inaccurate as it is not the permeability that is being measured but ionic movement Electrical Indication of Concrete’s Ability to Resist Chloride Ion Penetration. Assessing concrete quality

  21. Preparation Before RCPT Test 1 cm Epoxy 1 cm Cutting the specimens with the specified dimension. Sealing the concrete specimens with a layer of epoxy. Vacuuming for 24 hours.

  22. RCPT Test Concept (1/2) Concrete specimen is subjected to a 60 V DC for 6 hours. In one reservoir is a 3.0 % NaCl solution and in the other reservoir is a 0.3 M NaOH solution. The total charge passed is determined and this is used to rate the concrete.

  23. RCPT Test Concept (2/2)

  24. Charge Passed RCPT rating [6] Five levels are identified to classify the charge passed as corresponding to chloride ion penetrability of ‘‘high, moderate, low, very low, or negligible’’.

  25. 4- Detailed Design

  26. Tests Used • Slump to asses fresh concrete workability. • Compressive Strength Test (at 7, 28 Days). • RCPT Test (at 56 Days). • Resistivity Test (at 28, 56 Days).

  27. Slump

  28. Compressive strength test at 7 days

  29. Compressive strength test at 28 days

  30. RCPT (1/3) High Slope Low Slope

  31. RCPT (2/3) • Control Mix: • Charge passed were less that 3909 Coulombs • Chloride Ion penetrability is moderate

  32. RCPT (3/3) • Other mixes • Charge passed were less that 1000 Coulombs • Chloride Ion penetrability is very low. • Combination Mix [ GGBS 60% + SF 10%] • Charge passed = 50 Coulombs !!!! • Chloride Ion penetrability is Negligible.

  33. Resistivity at 28 days

  34. Compressive strength test at 28 days

  35. Discussion of detailed design alternatives (1/2) • Concrete mix could be designed based on the requirements of the project. • These requirements could be strength, durability, workability, the cost any combination.

  36. Discussion of detailed design alternatives (2/2) • The design alternatives could be one of the following: • Workable concrete mix • Concrete mix with high durability and strength (Early or late strength) • Concrete mix with low cost

  37. Matrix Decision (1/2) • If you have several conceptual ideas, then the decision matrix helps you to select the best one, based on multiple evaluation criteria. • The conceptual ideas are rated against criteria the designer decides as relevant to the task.

  38. Matrix Decision (2/2) The designer decides on importance ratings for each design criteria. Durability = 35 % Late Strength = 30 % Early Strength = 5 % Workability = 10 % Appearance = 5% Cost = 15 %

  39. Formal Decision-Making Process on Selection of Final Details (1/3) Conceptual Design Ideas Design Criteria Weighting Factor

  40. Durability = 20 % Late Strength = 15% Early Strength = 5 % Workability = 40% Appearance = 5% Cost = 15 %

  41. Formal Decision-Making Process on Selection of Final Details (2/3)

  42. Durability = 20 % Late Strength = 15% Early Strength = 5 % Workability = 10% Appearance = 5% Cost = 45 %

  43. Formal Decision-Making Process on Selection of Final Details (3/3)

  44. 5- Project Realization & Performance Evaluation

  45. Analysis and Optimization (Relevant Standards & Codes) • Several tests were done to evaluate concrete quality • Some of these tests followed standards. • Compressive strength  BS • RCPT  ASTM C 1202 • Sorptivity ASTM C 1585.

  46. Sustainability • SCM can reduce the embodied energy of precast concrete products by substituting waste materials for relatively high energy hydraulic cement • For each ton of supplementary cementing materials used in place of pure Portland cement, approximately one ton of greenhouse gas emissions is avoided . • Reduces air pollutant emissions • Reducing energy consumption

More Related