Michael Nelson, P.E. Concrete Engineer INDOT Office of Materials Management. February 19, 2019

Transcription

1 Michael Nelson, P.E. Concrete Engineer INDOT Office of Materials Management February 19, 2019

2 Topics: Specification updates Partial depth patching Optimized mix designs SPR-4210 in-place strength

3 QC/QA PCCP Joint Durability Unique Special Provision All 501 QC/QA PCCP requires at least one supplemental Cementitious material (SCM) Binary mix (20% - 40% SCM) 1. Portland cement 2. Slag cement or fly ash Ternary mix (25% - 40% SCM) 1. Portland cement 2. Slag cement or fly ash 3. Silica fume

4 QC/QA PCCP Joint Durability Unique Special Provision All 501 QC/QA PCCP requires at least one supplemental Cementitious material (SCM) Binary mix (20% - 40% SCM) 1. Portland cement 2. Slag cement or fly ash Ternary mix (25% - 40% SCM) 1. Portland cement 2. Slag cement or fly ash 3. Silica fume

5 QC/QA PCCP Joint Durability Unique Special Provision Hand pours Before April 1 & after October 15 Ternary April 1 to October 15 Binary Ternary Hand placed paving operations meeting the requirements of (c) and occurring prior to April 1 or after October 15, of the same calendar year, shall utilize concrete having a ternary binder system that contains silica fume as one of the SCM s. Concrete with a ternary binder system containing silica fume as one of the SCM s, may be used in any approved method of pavement placement without calendar restriction. Placement operations that involve form riding equipment in accordance with (b), may utilize any approved binary CMDP, without calendar date restrictions, with written approval by the Department.

6 Improved Workability RSP 502-R-678 Contracts let after Sept Max W/C ratio Max target Slump range: 2 to 6 (old spec 2 to 4 ) Allows Type A,B,C,D,E and F

7 Partial Depth Joint Repairs Total contracts - 30 Crawfordsville - 3 Ft. Wayne - 3 (1) Greenfield - 6 (3) LaPorte - 10 Seymour - 5 (3) Vincennes - 3 (1) (#) March/April 2019 lettings

8 Partial Depth Joint Repairs Mix options: 1. Prepackaged Concrete Patch Material, MnDOT 3U18 (3U18) 2. OPCC - Ordinary Portland cement based concrete (OPCC) 3. Rapid hardening cement based concrete (RHCC) 4. Latex Modified Concrete (LMC) 5. Very Early Strength Latex Modified Concrete (VESLMC) 6. Prepackaged Rapid Set Patching concrete (RSP) Five different options used 3U58 is an air entrained version of 3U18 (option #1) Not formally recognized in current USP Caution with RSP products (i.e. curing requirements)

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13 Joint sawed without compression material

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16 Concrete Mix Optimization The Tarantula Curve Dr. Tyler Ley Oklahoma St. University Dr. Dan Cook Buzzi Unicem USA

17 Concrete Mix Optimization The Tarantula Curve

18 Concrete Mix Optimization Thickness cores

19 Concrete Mix Optimization Box Test AASHTO PP (appendix X-3) 19

20 Concrete Mix Optimization Box Test 4 3 Over 50% overall surface voids % overall surface voids % overall surface voids. Less than 10% overall surface voids. 20

21 Research Strength Testing SPR-4210 Dr. Luna Lu, Purdue University Determining the Optimized Traffic Opening Time Using Piezoelectric Sensors Sensor measures conductance Frequency correlates with stiffness and compressive strength Attached to surface or embedded Not maturity Does not require a trial batch Very good correlation with compressive strength Could be revolutionary

22 Research Strength Testing SPR-4210

23 Patching New 506 patching specification Mid 2019 New standard drawings Simplify long patch/short patch USP Harmonize testing and opening strengths

24 Electronic Ticketing Pilot projects in Left in drum 2. Plant batched 3. Aggregate 4. Truck hose / tank

25 Training INDOT is pursuing ACI certification for technicians Includes module for trial batches Beginning second quarter 2019 Rollout will be over multiple years Does not replace current INDOT qualification program

26 Thank You! Questions