mandatory prepaving conference
DESCRIPTION
Mandatory Prepaving Conference. Chipseal Construction. Section 37.2 Seal Coats . Keys to Success. Proper surface preparation Use of right asphalt binder, asphaltic/polymer modified emulsion and clean aggregate screenings - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/1.jpg)
Mandatory Prepaving Conference
Chipseal Construction
Section 37.2 Seal Coats
![Page 2: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/2.jpg)
Proper surface preparation
Use of right asphalt binder, asphaltic/polymer modified
emulsion and clean aggregate screenings
Adherence to the project specifications, including traffic
control
Check equipment before start
Chip seal in good weather conditions
Keys to Success
![Page 3: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/3.jpg)
MaterialsEquipmentConstruction Procedures Quality ControlQuality Assurance
Topics to be covered
Section 37-2.01A Summary
![Page 4: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/4.jpg)
Asphalt Binder, Asphaltic Emulsion,
Polymer Modified Emulsion (PME)
Screened Aggregates
MATERIALS
Section 37-2.01A Summary
![Page 5: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/5.jpg)
Distributor Trucks
Screened Aggregate Spreaders
Self Propelled Screened Aggregate Spreader
Self Propelled Power Brooms & Vacuums
Pneumatic Tired Rollers
Width ≥ 4’
Weight ≥ 3000 lbs. per Wheel
Equipment
Section 37-2.03 Equipment
![Page 6: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/6.jpg)
Construction Procedures Proper Surface Preparation
Apply Binder/Asphaltic Emulsion/Polymer Modified
Emulsion at Specified Rates & Temperatures
Apply Screened Aggregates at Specified Rates
Roll-as Specified Number of Coverages
Allow Mat to Cure or Cool
Broom Loose Aggregate
Apply a Flush Coat
Open to Traffic After Curing Flush Coat.
![Page 7: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/7.jpg)
Sweeping (before and after) Hot Binder Application
Aggregate Application Rolling
![Page 8: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/8.jpg)
Construction- Surface Preparation-Existing Pavement
Section 37-2.03D Surface Preparation
![Page 9: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/9.jpg)
Construction- Surface Preparation-Existing Pavement
Section 37-2.03D Surface Preparation
Cover all exposed facilities before seal coat
application.
Reference all covered facilities properly for easy
location.
After seal coat application, expose the covered
facilities.
![Page 10: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/10.jpg)
Construction- Surface Preparation-Existing
Pavement
Section 37-2.03D Surface Preparation
Remove all loose and extraneous
material by brooming and vacuuming.
Ensure clean, dry surface before
applying seal coat.
![Page 11: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/11.jpg)
Construction –Applying asphaltic Emulsion
Section 37-2.03F
![Page 12: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/12.jpg)
Section 37-2.03F Applying Emulsion
In confined areas apply the emulsion with a squeegee,
rake or other means authorized by the Engineer.
Cover adjacent areas not intended for sealing with
suitable material.
At longitudinal joints, emulsion overlap must be
dispersed with squeegees before the application of
screenings or rakes.
Construction –Applying asphaltic Emulsion
![Page 13: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/13.jpg)
Section 37-2.03F Applying Emulsion
Construction –Applying asphaltic Emulsion
Align longitudinal seal coat joints with designated
traffic lanes. Ensure adequate overlap (4”-8”), as directed
by engineer.
Plan emulsion application with lane closure
requirements, stop an hour before darkness.
![Page 14: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/14.jpg)
Construction-EMULSION/BINDER
Application
Section 37-2.03F(3) &(4)
![Page 15: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/15.jpg)
Single OverlapDouble OverlapTriple Overlap
h
Roadway Surface
Construction – TYPES ofEMULSION Overlap
Section 37-2.03F(3) &(4)
![Page 16: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/16.jpg)
Construction – EMULSION Application
![Page 17: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/17.jpg)
Chip Seal Type Application Rate Range(gallons per square yard)
Fine 0.15-0.30Medium Fine 0.25-0.35
Medium 0.25-0.40Coarse 0.30-0.40
Asphaltic Emulsion or Polymer Modified Asphaltic Emulsion Application (Residual) Rates
Section 37-2.03F(3) &(4)
APHALTIC EMULSION APPLICATION RATES
![Page 18: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/18.jpg)
Chip Seal Type Application Rate Range(gallons per square yard)
Fine 0.15-0.30Medium Fine 0.25-0.35
Medium 0.25-0.40Coarse 0.30-0.40
Asphalt (Paint)Binder Application Rates
APHALT BINDER APPLICATION RATES
![Page 19: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/19.jpg)
Construction – SCREENED Aggregate Application
Section 37-2.03G (1), (2) &(3)
![Page 20: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/20.jpg)
Construction – SCREENED Aggregate Application
Section 37-2.03G (1)(2) &(3)
![Page 21: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/21.jpg)
Screened Aggregates SPREAD RATES
Chip Seal Type Spread Rate Range(Pounds per square yard)
Fine 12-20Medium Fine 16-25
Medium 20-30Coarse 23-30
Section 37-2.03G (1), (2) &(3)
![Page 22: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/22.jpg)
No Traffic on emulsioned areas
Uniform spread rates per specifications over entire lane width
Broom Excess screenings.
Aggregate screenings no roll after dropping.
Aggregate screenings should stop when the spreader stops
Do not spread aggregate screenings ≥ 2500’ ahead of completed initial rolling
Construction – SCREENED Aggregate Application
Section 37-2.03G (1) & (3)
![Page 23: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/23.jpg)
The application always starts with neat straight edges.
The aggregate spreader follows closely behind the distributor truck (50ft.)
Screened aggregates for Polymer Modified Asphaltic Emulsion application are in a damp condition.
The application looks uniform.
Enough trucks are on hand to keep steady supply of chips.
Check for streaks and gate plug.
Screened aggregate sample is secured from the middle of stockpile or chip machine belt for testing.
Construction – SCREENED Aggregate Application –BEST
PRACTICES
![Page 24: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/24.jpg)
Construction - Rolling
Section 37-2.03H(1)
![Page 25: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/25.jpg)
Construction - Rolling
Section 37-2.03H(1)
![Page 26: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/26.jpg)
Construction - Rolling Correct all ridges, piles, bumps or depressions.
Ensure straight joints, no more than 4” overlap
Longitudinal joints at lane lines
Use pneumatic rollers
Initial rolling with pneumatic roller one coverage
Three coverages of pneumatic roller for final rolling
Broom excess aggregate screenings before opening to
traffic
Section 37-2.03H(1)
![Page 27: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/27.jpg)
Construction - Curing of Emulsion
Curing time depends on ambient temperature and
relative humidity
Emulsion break should begin just after first roller
pass
Emulsion curing might take 2 to 6 hours, depending
upon asphaltic emulsion type & base asphalt
![Page 28: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/28.jpg)
Construction - Brooming Loose Aggregate
Section 37-2.03I Seal Coat Maintenance
![Page 29: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/29.jpg)
Seal coat surfaces must be maintained for 4 consecutive days from the day screened aggregates are applied.
Remove excess screened aggregates from surface by brooming. Exact brooming time & intervals determined by engineer
Use pilot cars to control traffic.
Schedule placement to ensure end of 1 way traffic control an hour before darkness.
Seal coat maintenance
Section 37-2.0I Seal Coat Maintenance
![Page 30: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/30.jpg)
Quality CONTROL-CONTRACTOR
Polymer Modified Emulsions
Viscosity (AASHTO T59)
Sieve Test (AASHTO T59)
Demulsibility (AASHTO T59)
Torsional Recovery (California Test 332)
Section 37-2.0ID (3)
![Page 31: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/31.jpg)
Quality CONTROL-CONTRACTOR
Screened Aggregates
CT 211, Loss at 100 revolutions ≤ 10%
Loss at 500 revolutions ≤ 40%
CT 302, Film Stripping ≤ 25%
C T 227 Cleanliness Value ≥ 80 for Asphaltic
Emulsions
C T 227 Cleanliness Value ≥ 86 for PMEs
Section 37-2.0ID (3)
![Page 32: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/32.jpg)
Quality CONTROL-CONTRACTOR Screened Aggregates- CT 202 Gradation-Asphaltic
Emulsion
Section 37-2.02H (2)
Percent PassingSieve Size
Coarse ½” Max
Medium3/8” Max
Med. Fine5/16” Max
Fine¼” Max
¾” 100 -- -- --
½” 95–100 100 -- --
3/8” 50–80 90–100 100 100
No. 4 0–15 5–30 30–60 60–85
No. 8 0–5 0–10 0–15 0–25
No. 16 -- 0–5 0–5 0–5
No. 30 -- -- 0–3 0–3
No. 200 0–2 0–2 0–2 0–2
![Page 33: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/33.jpg)
Quality CONTROL-CONTRACTOR Screened Aggregates- CT 202 Gradation-Polymer
Modified Emulsion
Section 37-2.02H (3)
Percent PassingSieve Size
Coarse ½” Max
Medium3/8” Max
Med. Fine5/16” Max
Fine¼” Max
¾” 100 -- -- --
½” 85–100 100 -- --
3/8” 0–30 85–100 100 100
No. 4 0–5 0–15 0–50 60–85
No. 8 -- 0–5 0–15 0–25
No. 16 -- -- 0–5 0–5
No. 30 -- -- 0–3 0–3
No. 200 0–2 0–2 0–2 0–2
![Page 34: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/34.jpg)
Quality CONTROL - Preliminary Responsibilities
Project review-Contractor
Alignment, geometrics, shoulders, turnouts
Document review-Joint
Plans & Specifications
Equipment & Material checks-Contractor
![Page 35: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/35.jpg)
Quality Control Pre-Application Inspection (cont.)
Weather requirements Check the local weather conditions for the proposed paving
day.
Ensure that the proposed paving operation can be
completed, including the emulsion cure within the favorable
weather window.
Reschedule paving operations if rain is predicted within the
next 48 hours.
Section 37-2.03C Unsuitable Day
![Page 36: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/36.jpg)
Quality Control Pre-Application Inspection
Surface preparation Equipment inspection
• Asphaltic emulsion distributor• Chip spreader• Haul trucks• Rollers- Adequate number of pneumatic rollers• Brooms
Section 37-2.01(D) Quality Control
![Page 37: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/37.jpg)
Quality Control Pre-Application Inspection (cont.)
Determining asphaltic emulsion &
screened aggregate application rates
Traffic control plan and setup
Section 37-2.03F(3) & (4) Application Rates
![Page 38: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/38.jpg)
Quality ASSURANCE - construction Inspection Asphaltic emulsion application & rates
California Test 339
Screened aggregate application & rates
Vialit (French)Test ≥ 90% Retention
Traffic control & trucking operation
Rolling
![Page 39: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/39.jpg)
Quality ASSURANCE - construction Inspection
Longitudinal joints – ensure no aggregate buildup
Transverse joints – ensure clean joints, start and stop on construction paper
Brooming to ensure absence of loose aggregate
![Page 40: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/40.jpg)
Quality Control /ASSURANCE Post-Application Inspection
Cleanup
Opening to traffic
![Page 41: Mandatory Prepaving Conference](https://reader036.vdocument.in/reader036/viewer/2022062810/56815d34550346895dcb310f/html5/thumbnails/41.jpg)
Thank you