road construction project

Concordia University

Construction Process

Road Construction Project

Woodland Grove Drive city of Regina

AmirsamanAsem,

Ayad Mohammad,

Asadeq Zaid,

Mohamed Fared Zuhri Yafi, 4-April-2013

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OutlineRoad Construction Processes Site descriptionMobilizationPavementCompactionProductivity CalculationConclusion

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Road Construction Processes

• Loading hot mix asphalt to the truck• Hauling asphalt to job site• Dumping the asphalt to the spreader • Spreader paving the asphalt• Roller breaking down the asphalt• Roller finishing the surface

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Site description

The project includes the construction of civil works, demarcation and signaling of an of Woodland Grove Drive at city of Regina.

• Location :Woodland Grove Drive from Arcola Avenue to Woodhams Drive.

• Estimated Value: $1,750,000.00.

• Start Date: Early May, 2012.

• End Date: Early September, 2012.

• Total pavement length 10km.

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MobilizationTake all necessary preparation steps to start the work by:

1. Taking approvals from authorities.

2. Develop management plan for traffic flow during construction of civil works,

3. Providing of barricades, signs, cones, and flaggers to do all the necessary safety precautions.

Leveling And Layout:Use of different types of leveling instrument to determine the reference points and the required level.

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PavementPrime coat is the first applied layer used to protect and stabilize the surface of the base.Use of liquid asphalt of the following types: RC-70, RC-250, MC-30, MC-70, MC-250, SC-70, upon to requirements of (ASTM-D2027).

• The maximum amount to be applied between 0.9 and 2.3 l/m2

• The temperature of the asphalt concrete leaving the plant should not be less than 135°C nor more than 163°C

BOMAG GmbH, Fayat Group (2009)

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1. Adequate compaction of asphalt is essential to ensure the mix design performance expected service life and required density is achieved.

2. The main factors influencing the successful compaction of asphalt are:

Compaction

Rolling procedures and techniques.

Temperature of the mix.

Mix properties.

Soundness and stiffness of the underlying base.

Type and numbers of rollers or other compaction equipment

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CompactionThe compaction process should follow the following order:

1. Transversal joints.

2. Longitudinal joints.

3. Outer edge.

4. Initial compaction of the strip.

5. Middle compaction of the strip.

6. Final compaction of the strip

BOMAG GmbH, Fayat Group (2009)

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Compaction Capacity

Factors that can affect the efficiency and productivity of a compactor:

1. Drum width

2. Number of passes

3. Roller speed.

4. Time elapsed since fresh asphalt was placed

5. Non-productive work time frames (i.e, breaks, vehicle maintenance)

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Productivity Calculation• Formulas are derived from (Peurifoy, R. L. Construction Planning,

Equipment)

P = number of passes required W = width compacted per pass (ft or m)S = compactor speed (mi/h or Km/h)L = compacted lift thickness (in or cm) E = job efficiency

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Productivity Calculation• The pavement area has divided to three sections , 50m length each.• The width of the compactor is approximately 2 meters.• Each strip was compacted 3 times. • The speed of the compactor was calculated as it follows

Speed = Distance / Time

Compaction ( section 2&3) in tandem formation 203 sec

Compaction (section 1) manual 57 sec

Finishing & smoothing compaction 182 sec

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Productivity CalculationFor adequate compaction density 3 passes of compactor required for section 2 and 3

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Productivity Calculation

Theoretically

The volume to be compacted in sections 2 & 3 is 6.35 m3 (2.0 x 50 x 0.0635 ).The following is a table of measured fixed times during the compaction.

Operation Time(Variable Time) (sec)

Fixed Time (sec)

Compaction ( section 2&3) in tandem formation 203 103

Compaction (section 1) manual 57 38

Finishing + smoothing compaction 182 51

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Productivity CalculationFixed Time

Moving the unit into position, Loading, maneuver and dump time.

Cycle time = Fixed time +Variable time

= 203+103=306 Sec =0.085hr

Production (section 2&3) = Volume/hour = 6.35 m3 / 0.085 hr = 75 m3/hr

% Error = (Experimental [Observed] – Theoretical) / Theoretical x 100% Error = (81-75)/75 x100 = 8 %

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Conclusion• Discrepancies in values between the theoretical and actual

observed production rate is mainly due to data collection difficulties.

• As the procedure of compacting was unclear and seemed at first glance that it was randomly performed, many spot time and maneuver times were not precisely measured.

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