MECHANIZED SPRAY PATCHING - Item No.
Special Provision No. 399F18 January 2008
1.0 SCOPE
This Special Provision covers the requirements for the mechanized spray patching of bituminous pavements with asphalt emulsion and aggregates.
2.0 REFERENCES
This Special Provision refers to the following standards, specifications and publications:
Ontario Provincial Standards Specifications (Material)
Ontario Provincial Standards Specifications (Construction)
OPSS 304 - Single and Double Surface Treatment
Ontario Provincial Standards Specification (Materials)
OPSS 1006 - Aggregates - Surface Treatment OPSS 1103 - Emulsified Asphalt
Ontario Traffic Manual (OTM)
Book 7, Temporary Conditions.
3.0 DEFINITIONS - Not Used
4.0 SUBMISSION AND DESIGN REQUIREMENTS - Not Used
5.0 MATERIALS
* Designer Fill-in, See Notes to Designer
6.0 EQUIPMENT
6.01 Tanker
The supply tanker shall conform to the requirements of the Ontario Gasoline Handling Act and Code, as administered by the Technical Standards and Safety Authority (TSSA), and shall have the following minimum equipment: a) A heating and circulating system to keep the binder at a constant and uniform temperature; b) An easily read dial thermometer and an armoured thermometer permanently mounted in the tank to accurately establish the temperature of the binder; and c) Provisions for offloading the binder.
January 2008 Page 1 of 4 SSP 399S18 6.02 Computerized Patching Unit
The patching unit shall have the following minimum requirements:
6.02.01 Computer Control System
The computer control systems shall have the following requirements: a) Capability of co-ordinating the spray nozzles and aggregate gates with the control levers so that the operator can, from his position, vary the width and length of the patch; b) Regulating the binder pump speed to ensure correct and uniform application of binder; and c) Measuring the area repaired in square metres.
6.02.02 Spray Bar
The spray bar shall be capable of: a) Adjusting the spray height; and b) Adjusting the spraying width from 0.3 m to at least 2.0 m.
6.02.03 Circulation System
The circulation system shall have a strainer.
6.02.04 Aggregate Gates
The aggregate gates shall be capable of adjusting the spread width to correspond to the selected spray width and provide a uniform flow and application of aggregates across the spreading width within a range of 0 to 30 kg/m2.
6.02.05 Aggregate Hopper
The aggregate hopper shall be self loading.
6.03 Rotary Power Broom
The power broom shall be capable of cleaning gravel, sand, dirt and other debris from a bituminous surface.
6.04 Roller
The roller shall be pneumatic-tired, self-propelled and shall be according to OPSS 304.
7.0 CONSTRUCTION
7.01 Operational Constraints
Patching operations shall not be carried out if any of the following situations exist:
January 2008 Page 2 of 4 SSP 399S18 a) The air temperature at the work location is less than 10C; b) The road surface is wet; c) Under conditions of high humidity; d) Rain is imminent; e) Prior to May 15th south of a line through Pembroke, Magnetawan and Pointe Au Baril Station except by written permission of the Contract Administrator; f) Prior to June 1st north of a line through Pembroke, Magnetawan and Pointe Au Baril Station except by written permission of the Contract Administrator; g) After September 1st except by written permission of the Contract Administrator; and h) Later than two hours before sunset.
7.02 Surface Preparation
Immediately prior to the patching operation the bituminous surface shall be swept clean of all gravel, sand, dirt and other debris.
7.03 Application of Binder and Aggregate
Binder shall be kept at a temperature of 70oC10oC in the tanker. Heating of the binder above the manufacturer's recommended range is not permitted. During the application of binder, the forward speed of the patching unit shall not exceed 3.5 km/h. After the surface has been prepared, the binder shall be uniformly sprayed at 1.9 litres/m2 for CRS-2 or CRS-2P, or 1.6 litres/m2 for HF150S. The application rate of aggregate shall be within the range of 12 to 14 kg/m2 for Class I aggregates, or within the range of 16 to 19 kg/m2 for Class II aggregates, and sufficient to ensure adequate stone coverage to prevent pick-up.
7.04 Rolling
The aggregate shall be rolled using a pneumatic-tired roller. The roller shall be operated at such a speed as to prevent aggregate pick-up but in no case shall the speed exceed 10 km/h. Rolling shall be carried out in such a manner that the entire area receives at least two passes from the pneumatic-tired roller. All rolling shall be completed within 300 m of the patching unit.
7.05 Protection of Work and Traffic Control
The Contractor shall ensure that the work is not damaged by traffic and shall restore areas damaged by traffic at no cost to the Owner. Traffic control shall be the responsibility of the Contractor and shall be according to the Ontario Traffic Manual (OTM).
7.06 Rotary Power Brooming
Excess aggregates shall be swept from the roadway within 24 hours of application and in such a manner that the patch is not damaged.
8.0 QUALITY ASSURANCE - Not Used
9.0 MEASUREMENT FOR PAYMENT
The area patched will be measured in square metres by the patching unit. The Owner reserves the right to verify measurements.
January 2008 Page 3 of 4 SSP 399S18 10.0 BASIS OF PAYMENT
10.01 Mechanized Spray Patching - Item
Payment at the contract price for the above tender item shall be full compensation for all labour, equipment and materials required to do the work.
January 2008 Page 4 of 4 SSP 399S18