CONSTRUCTION SPECIFICATION FOR SINGLE AND DOUBLE SURFACE TREATMENT

Transcription

1 ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 304 APRIL 1999 CONSTRUCTION SPECIFICATION FOR SINGLE AND DOUBLE SURFACE TREATMENT TABLE OF CONTENTS SCOPE REFERENCES DEFINITIONS SUBMISSION AND DESIGN REQUIREMENTS - Not Used MATERIALS EQUIPMENT CONSTRUCTION QUALITY ASSURANCE - Not Used MEASUREMENT FOR PAYMENT BASIS OF PAYMENT SCOPE This specification covers the requirements for surface preparation, application of bituminous binder, and application of aggregate for single and double surface treatment REFERENCES This specification refers to the following standards, specifications or publications: Ontario Provincial Standard Specification, General: OPSS 102 Weighing of Materials Page 1 Rev. Date: 04/99 OPSS 304

2 Ontario Provincial Standard Specifications, Material: OPSS 1 OPSS 1103 Aggregates - General Emulsified Asphalt Ministry of Transportation Publications: MTO Laboratory Testing Manual - LS-601 LS-602 LS-604 LS-606 LS-607 LS-608 LS-609 LS-614 LS-618 LS-619 LS-703/704 Material Finer Than 75 µm Sieve in Mineral Aggregates by Washing Sieve Analysis of Aggregates Relative Density and Absorption of Coarse Aggregate Soundness of Aggregates by Use of Magnesium Sulphate Determination of Percent Crushed Particles in Processed Coarse Aggregate Method of Test for Determination of Percent Flat and Elongated Particles in Coarse Aggregate Petrographic Analysis of Coarse Aggregate Freezing of Coarse Aggregate Resistance of Coarse Aggregate to Degradation by Abrasion in the Micro-Deval Apparatus Resistance of Fine Aggregate to Degradation by Abrasion in the Micro-Deval Apparatus Liquid Limit, Plastic Limit, and Plasticity Index of Soils DEFINITIONS For the purpose of this specification, the following definitions apply: Appurtenances: mean maintenance hole, catchbasin, valve chamber and water valve covers and similar utility access covers located within the paved portion on the roadway. Binder: means an emulsified asphalt with or without polymer modification used to bind aggregates. Double Lap: means the coverage produced from the application of binder where the binder from each spray bar nozzle overlaps the binder application from the adjacent nozzle by one half. Double Surface Treatment: means two successive single surface treatments. Lot: means the quantity of work completed with a tanker truck shipment of binder. Single Surface Treatment: means a single application of bituminous binder followed by a single application of Class 1, Class 2, Class 3, Class 4, Class 5 or Class 6 aggregate. Triple Lap: means the coverage produced from the application of binder where the binder from each spray bar nozzle overlaps the binder application from the adjacent nozzle by two thirds MATERIALS Binders Binders shall be according to OPSS Page 2 Rev. Date: 04/99 OPSS 304

3 Aggregates General Aggregates shall be according to OPSS 1. Aggregates containing slags are not acceptable for use as surface treatment aggregates. Irrespective of compliance with the physical requirements, aggregates may be accepted or rejected on the basis of past field performance Gradation Requirements Gradation of the aggregates shall be according to Table Physical Requirements The physical requirements of aggregates shall be according to Table EQUIPMENT Pressure Distributor The pressure distributor shall be designed and manufactured to spray binder on the road surface. The pressure distributor shall be capable of applying binder at the specified rates and in a continuous and uniform manner both longitudinally and transversely for a full lane width Mechanical Aggregate Spreader The mechanical aggregate spreader shall be designed and manufactured to be self-propelled and capable of continuously and uniformly distributing aggregate at the specified application rate Rotary Power Brooms Brooms shall be capable of cleaning gravel, sand, dirt and other debris from the roadway surface Rollers General Rollers shall be ballasted according to the manufacturer's recommendations and shall be subject to audit by the Contract Administrator Steel Drum Rollers Steel drum rollers shall be single drum vibratory rollers according to Table 3 and shall be operated in the static mode if the drum is not rubber coated. Drive wheels shall not mark the aggregate. Page 3 Rev. Date: 04/99 OPSS 304

4 Pneumatic-Tired Rollers Pneumatic-tired rollers shall be self-propelled and conform to Table 4. The wheels shall be mounted with smooth tread rubber tires. Tire inflation pressure shall be a minimum of 350 kpa when the tires are cold. All tires shall have equal pressure. Each roller shall be equipped with a suitable tire pressure gauge for checking tire inflation pressure Pilot Vehicle The pilot vehicle shall be equipped with an amber rotating light and a sign mounted with clearance not less than 1 m above the road. The sign shall be at least 1.5 m in width and 0.75 m in height, orange with black lettering and shall display the words: "Pilot Vehicle, Do Not Pass" CONSTRUCTION General Binder The Contract Administrator reserves the right to require the Contractor to provide binder field samples for testing purposes. The work shall include sampling, labelling, packaging and delivery of samples to the designated laboratory within five business days. Each binder sample shall consist of a minimum size of two full 4 litre samples of material. The sample containers for emulsified asphalt binder samples shall be new triple tight cans. Sample containers shall be supplied by the Contractor Aggregates The Contract Administrator reserves the right to sample the aggregates for testing purposes Operational Constraints Surface treating operations shall not be carried out when the ambient temperature at the work location is less than 10 C or where climatic or site conditions preclude the curing of the binder. The application of binder and aggregate shall terminate one hour before sunset. Surface treatment shall not be carried out prior to May 15th south of a line through Pembroke, Magnetawan and Pointe au Baril Station or prior to June 1st north of the line. Surface treatment shall not be carried out after September 1st except with the approval of the Contract Administrator. Surface treatment may be extended to September 30th provided a high float emulsion is used. Page 4 Rev. Date: 04/99 OPSS 304

5 Determination of Binder and Aggregate Application Rates The Contractor shall demonstrate to the Contract Administrator satisfactory compliance to the specified application rates of binder and aggregate. At the Contract Administrator's discretion, this compliance may include a minimum 300 m one lane width trial section to ensure that the binder and aggregate are applied at the specified rate Acceptance of Binder The binder application rate is acceptable when the rate of application is within the tolerance of ± 5% of the specified rate Acceptance of Aggregate The aggregate application rate is acceptable when the rate of aggregate application is within the tolerance of ±10% of the specified rate Protection of the Work and Traffic Control Until such time, as the work has been accepted by the Contract Administrator, the Contractor shall repair damaged areas at his own cost Surface Preparation Existing bituminous surfaces shall be clean and free of all debris before application of binder. Where a binder is to be applied on a granular surface, the surface shall be prepared by dampening, fine grading, and compacting immediately prior to the application of the binder Binder Application Temperatures Binder application temperatures shall be according to OPSS Application of Binder After the surface has been prepared, the binder shall be uniformly sprayed on the road surface at the specified rate. The spray bar height shall be adjusted to ensure that there is triple lap of the binder application. At the written request of the Contractor, the Contract Administrator may allow the use of a double lap application. Longitudinal joints shall be constructed to ensure full coverage on the centreline. The application of binder shall terminate at the same station for both lanes at the end of each day. All roadway appurtenances within the area to be surfaced shall be properly covered and protected immediately prior to single and double surface treatment Application of Aggregate Aggregate shall be uniformly applied at the rate specified. The distance between the pressure distributor and the spreader shall not be more than 30 m. If excess aggregate is present when constructing a double surface treatment, the excess shall be removed prior to the second application of binder. Page 5 Rev. Date: 04/99 OPSS 304

6 Rolling Immediately after spreading, the aggregate shall be rolled with a minimum of two pneumatic-tired rollers. The entire treated area shall receive two passes from each pneumatic-tired roller. When the surface treatment is placed on a prepared granular grade, one pneumatic-tired roller shall be replaced by a steel drum roller. The entire treated area shall receive two passes from the pneumatic-tired roller and one pass from the steel drum roller. Rollers shall be operated at such a speed that there is no aggregate pick-up, but in no case shall the speed of rollers exceed 10 km/h. All rolling shall be completed within 300 m of the aggregate spreader. When the combination of rollers is not sufficient to maintain the completed rate of progress, additional rollers shall be required Traffic Convoy Where specified, the Contractor shall convoy traffic. The Contractor shall supply one pilot vehicle and operator to guide one-way traffic through or around construction. The maximum speed of the convoy shall be 30 km/h and the convoying shall be maintained for a minimum of one hour after rolling, or longer if directed by the Contract Administrator MEASUREMENT FOR PAYMENT Binder Binder will be measured for payment by mass in kilograms according to OPSS Class 1, 2, 3, 4, 5 or 6 Aggregate By Mass Aggregate applied to the road will be measured in tonnes according to OPSS By Volume Measurement will be in cubic metres, loose, by predetermined truck capacities. The predetermined capacity of each truck will be that computed from its box dimensions. Loading of each truck shall be kept to not less than the predetermined capacity. The Contractor will not be required to load trucks in excess of this capacity to allow for bulking, and no deduction shall be made for any settlement of the load during transportation, provided that such settlement is not caused by spillage or leakage. Each truck shall be uniquely and readily identifiable. Page 6 Rev. Date: 04/99 OPSS 304

7 Traffic Convoy The measurement for traffic convoy will be based on the number of hours that the pilot vehicle is convoying traffic BASIS OF PAYMENT Binder "type" - Item Class 1 Aggregate - Item Class 2 Aggregate - Item Class 3 Aggregate - Item Class 4 Aggregate - Item Class 5 Aggregate - Item Class 6 Aggregate - Item Traffic Convoy - Item Payment at the contract price for the above tender items shall be full compensation for all labour, equipment and material to do the work. Page 7 Rev. Date: 04/99 OPSS 304

8 MTO SIEVE DESIGNATION Class mm 16.0 mm 13.2 mm 9.5 mm 6.7 mm 4.75 mm 2.36 mm 1.18 mm 600 µm 300 µm 150 µm 75 µm Table 1 Gradation Requirements - MTO Lab Test No. LS-602 PERCENTAGE PASSING BY MASS Class 2 Class Class 4 Class Notes: 1. Class 1 and Class 5 aggregates shall be washed according to OPSS Class 3 and Class 6 aggregates have the same gradation requirements as HL4 and HL3 coarse aggregates respectively. Class Page 8 Rev. Date: 04/99 OPSS 304

9 MTO LAB TEST TEST NUMBER Table 2 Physical Requirements Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Loss by Washing, Pass 75 µm Sieve, % Maximum LS Absorption, % Maximum LS Magnesium Sulphate Soundness, 5 Cycles, LS % Maximum Loss, (Note 3) Percent Crushed, LS % Minimum Flat and Elongated Particles, % LS Maximum Petrographic Number, LS Maximum (Note 4) Micro-Deval Abrasion, Coarse Aggregate, LS % Loss, Maximum Micro-Deval Abrasion, Fine Aggregate, LS % Loss, Maximum Plasticity Index, Maximum LS-703/ ALTERNATIVE REQUIREMENTS TO MAGNESIUM SULPHATE SOUNDNESS - LS-606 Unconfined Freeze-Thaw Loss, % Maximum LS OPTIONAL REQUIREMENTS Petrographic Examination, % Non-carbonate, LS-609 (Note 5) (Note 5) (Note 5) (Note 5) (Note 5) Retained 4.75 mm NOTES: 1. Class 1, 2, 3, 5 and 6 physical requirements noted above are for the material retained on the 4.75 mm sieve, except for lab test LS When quarried rock is used as a source of coarse aggregate, a maximum of 2.0% passing the 75 µm sieve shall be permitted. 3. The requirements will be waived by the Owner when the aggregate meets the alternative unconfined freeze-thaw requirements of LS The weighted petrographic numbers shall be the hot-mix and concrete petrographic number. 5. When the coarse aggregate for surface coarse is obtained from a gravel pit or quarry containing more than 40% limestone and dolostone in the retained 4.75 mm portion of the coarse aggregate, then blending with aggregate of noncarbonate rock type shall be required. The blend shall be such as to increase the non-carbonate rock type content to 60% minimum of the retained 4.75 mm portion, as determined by petrographic examination - LS-609. The method of blending shall be such as to produce uniform blending and shall be subject to approval by the owner. When the coarse aggregate for surface treatment is obtained from a non-carbonate source, blending with carbonate rocks (limestone and dolostone) shall not be permitted. Page 9 Rev. Date: 04/99 OPSS 304

10 Minimum Drum Diameter mm Table 3 Requirements for Steel Drum Rollers Minimum Drum Width mm Minimum Static Mass per mm of Drum Width kg Roller Class Table 4 Requirements for Pneumatic-Tired Rollers Minimum Mass t Minimum Mass per Tire kg R R R Page 10 Rev. Date: 04/99 OPSS 304