AMRL Mixing Demos

AMRL Mixing DemosAMRL Mixing DemosJune 9-18, 2014June 9-18, 2014

The Plan

• Explain Two AMRL Programs

• Perform Mixing Demos• One Residency in each of 8 Division’s

• Potential OHD L-14 Changes

Explain Two AMRL Programs

• OMRL Program Replaced by Two AMRL Programs• OMRL Program Started 1987

• Aid in Calibration of Hveem Compactor• 26 ODOT Labs Participated originally• 2013 – 88 Labs Participated in Program

• “A” and “AD” Labs Required to Participate in Proficiency Programs

• Link for Policy and Qualification Status Follows


http://www.okladot.state.ok.us/materials/htm-smap/11069.htm


• Two AMRL Programs to replace OMRL Program• Hot Mix Asphalt Gyratory• Hot Mix Asphalt Ignition Oven• AMRL Links Follows


• Amrl.net > Proficiency Samples > Fees• http://amrl.net/amrlsitefinity/default/psp.aspx


http://amrl.net/amrlsitefinity/default/psp/fees.aspx


• Ratings After Final Report and Login


• Ratings of -1, 0, and 1 Require a Corrective Action Report

• Consult with ODOT Bituminous Engineer• Kenneth Ray Hobson, PE

• Send Report to ODOT Liaison Supervisor• Michael Groom

• Link Follows


Amrl.net > Proficiency Samples http://amrl.net/amrlsitefinity/default/psp.aspx


• Schedule for Samples• SGC ~ June, Ignition Oven ~ January


• Schedule for Samples


• Datasheet & Instructions


• Download and Save All Instruction Sets• http://amrl.net/amrlsitefinity/default/psp/Datasheets.aspx

Perform Mixing Demos

• ScheduleResidency Resident Contact Demo Date / Time Directions or Address Phone

OKC Howell, Terry Bryon Jones Monday, June 9, 2014 / 1:00 - 2:30 PM1021 S.E. 59th, OKC, OK 73129

(405) 636-4044

Buffalo Burke, David Jeff Tuesday, June 10, 2014 / 1:00 - 2:30 PM US-64 West, Buffalo, OK 73834 (580) 735-2537

Clinton

Demo at CED #7

Kaymeyer, DaveRicky HernandezCorey Nagle

Wednesday, June 11, 2014 / 1:00 - 2:30 PM

US-183 S. (1 Mi. S. I-40), Clinton, OK 73601

Demo at CED #7: 1779 Marshall Rd, Clinton, OK 73601

(580) 323-0702

CED #7 (580) 323-6865

McAlester Plymate, Larry Allan Hinton Thursday, June 12, 2014 / 1:00 - 2:30 PM

US-270 E. McAlester, McAlester, OK 74502

1/4 mile East of U.S. 69 South 270 Cloverleaf East on Highway 270

(918) 423-5443

Wewoka Moore, Archie Mike Dull Friday, June 13, 2014 / 1:00 - 2:30 PM1 ½ M.N. Wewoka on SH-56, Wewoka, OK 74884

12636 North South 3665(405) 257-3325

Tulsa Arnold, Bruce Tami Remington Monday, June 16, 2014 / 1:00 - 2:30 PM 4002 N. Mingo Valley Expwy, Tulsa, OK 74116 (918) 836-7116

Ardmore Fuhrmann, Chris Laurie Enabnit Tuesday, June 17, 2014 / 1:00 - 2:30 PM 525 Interstate Drive, Ardmore, OK 73402 (580) 223-1351

Muskogee Hagerman, Jeremy Mike Beebe Wednesday, June 18, 2014 / 1:00 - 2:30 PM 2800 South 32d, Muskogee, OK 74401 (918) 682-9471


• Recorded Videos at:• McAlester -http://www.okladot.state.ok.us/materials/KEN_HOBSON_PRESENTATION/AMRL%20Mixing%20Demo%20McAlester.mp4

• Muskogee -http://www.okladot.state.ok.us/materials/KEN_HOBSON_PRESENTATION/AMRL%20Mixing%20Demo%20Muskogee.mp4

Links to videos to be removed in 2015.


• Key Items in Mixing:• See PDF File for 2014 SGC Sample

Instructions

• Tips for Items of Note to Follow• Most were Discussed during Demos


• SGC 2014 Samples 37&38 Deadline Dates

• Split minus #8 (-#8, Fines) for A and B samples into 2 parts each (4 total) using Methods C or D in AASHTO T 248

• Dry Coarse and Fines Aggregates to 230ºF• Crack Lid of Mineral Filler (MF) Can

• Cool Aggregates to Room Temperature ~77ºF


• Combine Aggregates According to Table of Instructions• Use Square Scoop for Flat Pans• Use Semi-Circular Scoop for Semi-Circular

Pans• MF

• Secure Can’s Lid• Dry Mix in Can by Inverting until Fully Mixed• Add to Batch by Spatula from Can or Scoop from a

Pan


• Use Cumulative Weights in Table• Add Each Aggregate Size Portion in Pile

Sections• Cover MF and -#8 Fines with Coarse

Aggregates• This Minimizes Fine Loss in Oven

• Place Batch into Pans used for AASHTO T312


• Crack Open Binder Can’s Lid

• Place Aggregate Batches, Binder(s), Mixing Bowl(s), and Whip(s) in Oven at 310.5ºF (avg. may vary each year)

• Two Hours is Often Sufficient in Force Draft Ovens


• Quickly:• Place Aggregate Batch in Mixing Bowl• Make a Crater in Center of Aggregate Pile• Place Bowl on Scale and Tare to Zero• Place Scrap Papers (~4”x4” or more) Next to

Scale• Used for Wiping Binder Can’s Lip and Adjusting a

Small Excessive Amount of Binder Quantity

• Place Trash Can Next to Scale


• Quickly but Carefully:• Remove Binder from Oven and Place Near Scale• Pour Binder from Can into Crater in Bowl to

Proper Amount (204.8 g Sample 37(A) in 2014)• Always use proper safety equipment and procedures

in the lab to avoid burns and know how to react to accidents.

• E.g.. Tongs or Pliers can help with pouring binder from a can.


• Remove Whip from Oven• Shove Whip Towards Bottom of Bowl

• Twisting Action Can Help

• Shove Top of Whip to Side of Bowl• Place Bowl’s Back Post Nub into Mixer First• Align Two Side Posts and Snugly Fit Bowl

onto Mixer at the Two Posts• Slide Safety Latch Over Post(s)


• Securely Insert Whip into Mixer• Set Mixer Speed to Lowest Level• Set Mixer On/Timer for Two (2) Minutes (3 at

Most)• Crank Mixer Lever to Mixing Position• Periodically, Remove Safety Latch to Side

• Shove a Corner of the Bowl, Near a Side Post, Up for ~3 Passes

• Take care to not get fingers near mixing action.


• Stay Near the Timer or Kill Switch for the Mixer• If a Whip Breaks:

• Cut Mixer’s Power Off (Timer Switch or Toggle Switch, or Drop Lever for Bowl Height)

• Cut Whip Strand near Top and Bend Towards Center of Whip

• Try to Avoid Loss of Mixture (Shake Whip Against Side)

• Reheat Mixer, Whip, and Mixture to Mixture Temperature and Mix Until Aggregates are Coated


• After Two Minutes of Mixing• All Aggregates Should be Coated with Binder

• If not, check temperature or do another minute of mixing.

• Remove Whip from Mixer Post and Shove Down into Mixture

• Remove Bowl from Mixer• With Heated Spatula, Edge Corners Rounded:

• Quickly (~10 s) Scrap Down along Edges of Bowl • Depth is usually 2” to 3”


• Pour Mixture into Batch Pans• Fines from the Batch Pan or Few Fines not

Fully Coated During Mixing:• Hand mix with heated spatula or bent spoon in T

312 Batch Pan (Spread 1” to 2” thick).

• Label this Pan as “A-Rice”• Place Pan in Oven at Compaction

Temperature – Avg. of 288.5ºF (this year’s sample requirement)


• Place Whip in Oven at Mixing Temperature

• Pour 2nd Batch for Sample “A” into Bowl

• Repeat Previous Mixing Steps

• Label this Pan as “A-SGC”• Pan Labeling is optional. Noting a pan

number is sufficient if sample number and test type is identified . Key here is to know what each pan contains.


• Age Each Sample “A” (two mixtures) the Same Amount of Time• Samples May be Staggered to Allow Stirring• Stir Each Sample at Hour’s One and Two

• ± 5 Minutes for each Hour

• After 2nd Stirring for “A-Rice”• Split to Rice Test Size (1,500 g minimum) AASHTO

T 209 (Rice)


• After 2nd Stirring of “A-SGC”• Load into Transfer Shute and Compact in SGC

by AASHTO T 312• Note: Use Ndes and Nini as Required by AMRL

(e.g. SGC 37(A), Ndes = 100, Nini =8)

• Note: A Clean Bowl and Whip is Required for the Rice Sample for Sample’s “A” and “B”.• e.g. Sample “B” may be delayed a day or more if

extra bowls and whips are not used.


• Once AMRL Samples are Mixed and Compacted:• Perform Tests as Instructed (Similar to previous

OMRL tests.)• Test SGC compacted sample at room

temperature according to AASHTO T 331 (similar to OHD L-45) first.

• Record Height at Nini During Compaction• Gmb(Nini) = Gmb(Ndes) X Ndes(height mm) / Nini

(height mm)


• If Bag Punctures, note that on the datasheet and use AASHTO T 166 method(s) to re-dry the specimen and perform T 331 again.


• Non-Destructive Drying Methods Allowed in AASHTO T 166:• Dry at 125 ± 5ºF in Oven for 24 Hours

• Weigh Back Every 2 Hours Until No Mass Loss

• Dry Using ASTM D7227 (Vacuum Dried Method)

Potential OHD L-14 Changes

• Density for Roadway Cores Computation Changed• Governed by Special Provision 411-17 Tablehttp://www.okladot.state.ok.us/c_manuals/specprov2009/oe_sp_2009-411-17.pdf

e.g. PGmm = Gmb / Gmm X 100

• Report %Air Voids to 0.1 rather than 0.01.

• Non-Nuclear Gauge (NNG) to be Removed


• Common Nuclear Gauge (NG) Excel File Developed• R2 minimum of 0.50 required for NG fit to Core

Gmb • ASTM E178 Outlier Method Detailed

• NG Orientation and Readings Changed

• Allows Vacuum Drying Methods for Roadway Cores (see AASHTO T 166)


• Added Note, if needed, do not take Longitudinal Joint Density Cores within 15’

Questions

It was a pleasure performing the demonstrations and meeting field personnel. Thanks to lab personnel for accommodating the demonstrations.

Bituminous Engineer

Kenneth Ray Hobson, P.E.

[email protected]

(405) 522-4986

Date post:	02-Feb-2016
Category:	Documents
Upload:	doria
View:	49 times
Download:	0 times

AMRL Mixing Demos

Documents