Use of Dolomitic Micro Fines in Concrete. Dan Miller, MSCE, PE OMM Cement and Concrete Engineer Ohio Department of Transportation
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1 Use of Dolomitic Micro Fines in Concrete Dan Miller, MSCE, PE OMM Cement and Concrete Engineer Ohio Department of Transportation
2 OVERVIEW Introduction Development Mix Designs Fresh Concrete Properties Hardened Concrete Properties Freeze-Thaw, Alkali Carbonate Results, Shrinkage Results Current Field Installations Follow up and C&MS Language
3 INTRODUCTION What are Micro-fines Can Micro-fines Improve Concrete Strength and Durability Does the Material Increase or Decrease Water Demand Cement Replacement or Fine Aggregate Replacement How to Introduce Micro-fines into the Mix Is it Cost Effective Compared to SCMs or Additional Cement
4 DOLOMITIC MICRO FINES (MINERAL FILLER) Small Particles Captured from Quarry Production Fines-packing is very Desirable for Strength and Durability; DMF Achieves this by Surrounding the Cement Particle. Fills the Voids between Cement Particles to Create Additional Nucleation Sites. Assists in Bridging the Gap between the Cement and Fine Aggregates Versus Cement Alone.
5 DEVELOPMENT ICAR Report 401 and National Lime & Stone Data Reviewed Meetings Held with OAIMA and National Lime & Stone ACI 211.7R-15 Guide for Proportioning Concrete Mixtures with Ground Limestone and Other Mineral Fillers ASTM WK Standard Specification for Ground Calcium Carbonate and Aggregate Mineral Fillers for use in Hydraulic Cement Concrete
6 DEVELOPMENT ODOT Laboratory wanted to Verify Industry Results Dolomitic Micro-fines used were DMF 80 from National Followed C&MS Item 499 for Mix Designs (ACI 301) Seven Mixes Created (Control, 10%, 20%, 30%, Control(2), 15%, Tern.) 0.45 w/c Ratio.44 w/cm Ratio for Ternary Mix
7 MIX DESIGN (w/cm= 0.45) Material Source Location Weight (lb.) Cement Saylor s Nazareth 600/540/480/420 Coarse Aggregate (#57) Melvin (Limestone) Melvin 1125 Coarse Aggregate (#8) National Lime and Stone Carey 651 Fine Aggregate Olen (Natural Sand) Columbus 1184 Dolomitic Micro Fines (80) National Lime and Stone Findlay 0/60/120/180 AEA BASF- MBVR 0.60 oz./cwt Water Reducer BASF- Pozzolith 322N 6.0 oz./cwt Super Plasticizer BASF- Glenium oz./cwt
8 TERNARY MIX DESIGN (w/cm= 0.44) Material Source Location Weight (lb.) Cement Saylor s Nazareth 361 GGBFS St. Marys Detroit 90 Coarse Aggregate (#57) Melvin (Limestone) Melvin 1146 Coarse Aggregate (#8) National Lime and Stone Carey 664 Fine Aggregate Olen (Natural Sand) Columbus 1207 Dolomitic Micro Fines (80) National Lime and Stone Findlay 113 AEA SIKA AIR 6.0 oz./cwt Water Reducer SIKAMENT AFM 2.3 oz./cwt
9 FRESH CONCRETE PROPERTIES
10 FRESH CONCRETE PROPERTIES Mix 1, No Adjustments Mix 2, No Adjustments Mix 3 Showed Higher Slump Due to Excess Water Thought was Micro-fine Addition would Increase Water Demand Mix 4 Water was Adjusted Prior to Mixing (w/cm= 0.38) Additional 50cc of HRWR Added 3.85 Pounds of Additional Water Added Actual w/cm Ratio- 0.43
11 FRESH CONCRETE PROPERTIES Mix 5, No Adjustments, Rerun of Control due to failure Mix 6, No Adjustments Mix 7, No Adjustments
12 HARDENED CONCRETE PROPERTIES Compressive Strength (ASTM C39) Splitting Tensile Strength (ASTM C496) Shrinkage (ASTM C157) ACR Length Change (ASTM C1105) Rapid Chloride Permeability (ASTM C1202) Freeze-Thaw (ASTM C666 Procedure B) Durability (ASTM C215)
13 COMPRESSIVE AND SPLIT-T STRENGTH
14 SHRINKAGE RESULTS MIX 1-4
15 SHRINKAGE RESULTS MIX 6-7
16 ACR LENGTH CHANGE AND DURABILITY
17 ACR LENGTH CHANGE AND DURABILITY
18 RAPID CHLORIDE PERMEABILITY
19 FREEZE-THAW RESULTS
20 CURRENT PLACEMENTS District 1- Findlay Wheelchair Ramp Placement Photos by Marc Powell (National L&S)
21 CURRENT PLACEMENTS District 1- ODOT , Van Wert Photos by Marc Powell (National L&S)
22 FOLLOW UP AND C&MS LANGUAGE Monitor Field Installations Adoption of WK36906 as an ASTM Standard Develop a Supplement Similar to Cement and Pozzolans Set the Maximum Limit for Replacement Add Language to Item 700 Section
23 ACKNOWLEDGEMENTS Pat Jacomet, Ohio Aggregates & Industrial Materials Association Marc Powell, National Lime & Stone Company Jeff Wigdahl, National Lime & Stone Company Prasad Kudlapur, Ph.D., PE, ODOT OMM Concrete Lab Manager ODOT Cement and Concrete Laboratory Staff
24
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