ASCE TEXAS 2013 centennial
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ASCE TEXAS 2013 centennial

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http://www.texasce.org/displaycommon.cfm?an=1&subarticlenbr=246

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ASCE TEXAS 2013 centennial ASCE TEXAS 2013 centennial Presentation Transcript

  • Sustainable Utilization of RO By- Product Solids By Bijoy Krishna Halder, Vivek Tandon, Anthony Tarquin, Guillermo Delgado The University of Texas at El Paso
  • Agenda  Introduction  Challenges  Objective  Material Used  Micro Scale Test  Sample Preparation and Curing Condition  Compressive Strength Test  Conclusion
  • Introduction
  • 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.
  • Challenges
  • Challenges  The disposal of this waste CaSO4 by-product in an environmentally friendly manner is an issue.
  • Objective
  • • Evaluate the feasibility of using RO by-product in cement mortar and AACB (alkali activated complex binders) mortars . Objective
  • Material Used
  • 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
  • • 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
  • MICRO SCALE TEST
  • 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)
  • SEM Analysis of RBG (a) (b)
  • 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
  • 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
  • Sample Preparation & Curing Condition
  • 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
  • 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.
  • Compressive Strength Test (ASTM C 109-08)
  • Compressive Strength Test Result
  • Compressive Strength Test Result
  • Compressive Strength Test Result
  • Conclusion
  • Conclusion • The compressive strength test results indicate that there is feasibility of disposing RO byproduct CaSO4 in geopolymer based mortars.