ASCE TEXAS 2013 centennial
•
1 gostou•455 visualizações
http://www.texasce.org/displaycommon.cfm?an=1&subarticlenbr=246
Recomendados
Recomendados
Mais conteúdo relacionado
Mais procurados
Mais procurados (20)
Semelhante a ASCE TEXAS 2013 centennial
Semelhante a ASCE TEXAS 2013 centennial (20)
Último
Último (20)
ASCE TEXAS 2013 centennial
- 1. Sustainable Utilization of RO By- Product Solids By Bijoy Krishna Halder, Vivek Tandon, Anthony Tarquin, Guillermo Delgado The University of Texas at El Paso
- 2. Agenda Introduction Challenges Objective Material Used Micro Scale Test Sample Preparation and Curing Condition Compressive Strength Test Conclusion
- 3. Introduction
- 4. Introduction • Water is an important resource. • To produce potable water, various techniques e.g. desalination is used. • One desalination process is The Concentrate Enhanced Recovery Reverse Osmosis (CERRO©) • However this process yield high concentration CaSO4 as RO by-product.
- 5. Challenges
- 6. Challenges The disposal of this waste CaSO4 by-product in an environmentally friendly manner is an issue.
- 7. Objective
- 8. • Evaluate the feasibility of using RO by-product in cement mortar and AACB (alkali activated complex binders) mortars . Objective
- 10. Material Used • Cement (Type I/II OPC, ASTM C-150) • Quickrete all purpose sand (ASTM C 33 ) • Water • NaOH (10M) • Sodium Silicate (Na2O:SiO2=1:1) • CaSO4 salt, RBG (passing #16 sieve ) • Class F fly Ash
- 11. • Fly ash Property (Collected from Boral Material Technology) Material Used (Cont.) Component Results SiO2 50.69 % Al2O3 23.68 % Fe2O3 4.68 % SiO2+ Al2O3+ Fe2O3 79.05 % CaO 13.19 % MgO 1.62 % SO3 1.78 % Na2O 0.05 % K2O 0.90 % Total Alkalies (as Na2O) 0.64 % Loss of Ignition, % LOI 1.69 % Specific gravity 2.29 1
- 12. MICRO SCALE TEST
- 13. XRD Analysis of RBG 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Br Br Br H B BB B B B B B B Intensity(A.U) 2-Theta B B: Bassanite Br: Brucite H: Hallite • Bruker D8 X-ray diffractometer • Bassanite, (CaSO4, 0.5 H2O)
- 14. SEM Analysis of RBG (a) (b)
- 15. SEM Analysis of RBG (Cont.) SEM EDX of Rod Shape Particle -1 0 1 2 3 4 5 0 1000 2000 3000 MgK NaK SK OK CaL ClK CaK CaK CountPerSeconds Energy, KeV ClK SEM EDX of Gel layer
- 16. Laser Diffraction Particle Sizing of Fly Ash Parameter Outcome D (0.1) 3.92 µm D(0.5) 34 µm D(0.9) 139.80 µm Surface weighted mean D[3,2] 8.855 µm Volume weighted mean D [4,3] 85.5 µm Specific surface area 678 m2 /kg Mean particle size 65 µm
- 17. Sample Preparation & Curing Condition
- 18. Sample Preparation (Cont.) ASTM* C-109 (2008) Cement: Sand: Mixing Liquid= 1:2.75:0.49 AACB mortar (Fly Ash:Sand= 1:2.75, Sodium Silicate: NaOH=0.67, minimum base water 5% by mass of geopolymer paste ) Samples were prepared in 2 × 2 × 2 in.. *American Society of Testing material
- 19. Curing Process • Tap Water (For standard samples) • Cement Mortar cured at room temperature, submerging under water. • AACB mortars were kept at 75 ̊ C for total 3 days accelerated curing.
- 20. Compressive Strength Test (ASTM C 109-08)
- 21. Compressive Strength Test Result
- 22. Compressive Strength Test Result
- 23. Compressive Strength Test Result
- 24. Conclusion
- 25. Conclusion • The compressive strength test results indicate that there is feasibility of disposing RO byproduct CaSO4 in geopolymer based mortars.