CONSTRUCTION SPECIFICATION FOR SLURRY SEAL

Transcription

1 ONTARIO PROVINCIAL STANDARD SPECIFICATION METRIC OPSS 337 APRIL 1999 CONSTRUCTION SPECIFICATION FOR SLURRY SEAL TABLE OF CONTENTS SCOPE REFERENCES DEFINITIONS SUBMISSION AND DESIGN REQUIREMENTS MATERIALS EQUIPMENT CONSTRUCTION QUALITY ASSURANCE MEASUREMENT FOR PAYMENT BASIS OF PAYMENT SCOPE This specification covers the requirements for slurry seal and includes all surface preparation, material application, handwork, joints, protection while curing, clean up, and provision for a trial area REFERENCES This specification refers to the following standards, specifications, and publications: Ontario Provincial Standard Specifications, General: OPSS 180 Management and Disposal of Excess Material Page 1 Rev. Date: 04/1999 OPSS 337

2 Ontario Provincial Standard Specifications, Material: OPSS 1001 OPSS 1003 OPSS 1103 OPSS 1302 Aggregates - General Aggregates - Hot Mixed, Hot Laid Asphaltic Concrete Emulsified Asphalt Water Ministry of Transportation Publications: MTO Laboratory Testing Manual - LS Sieve Analysis of Aggregates Canadian Standards Association, CSA: A5/A8/A Portland Cement/ Masonry Cement/ Blended Hydraulic Cement American Society for Testing and Materials, ASTM: D Design, Testing and Construction of Slurry Seal International Slurry Surfacing Association, ISSA: TB Measurement of Slurry Seal Consistency TB Measurement of Excess Asphalt in Bituminous Mixtures by Use of a Loaded Wheel Tester and Sand Adhesion TB Wet Stripping Test for Cured Slurry Seal Mix TB Determination of Slurry System Compatibility TB Classify Emulsified Asphalt/Aggregate Mixture Systems by Modified Cohesion Tester Measurement of Set and Cure Characteristics 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 of the roadway. Slurry Seal: means a homogeneous mixture of emulsified asphalt, fine aggregates, water, mineral filler and if required, additive. This mixture is applied in a cold fluid state on a prepared bituminous surface SUBMISSION AND DESIGN REQUIREMENTS A construction material laboratory equipped to carry out slurry seal mix designs shall determine the mix proportions and prepare the job mix formula. The compatibility of the aggregate and the emulsified asphalt shall be confirmed by the laboratory designing the mix. All component materials used in the mix design shall be representative of the material to be used on the Contract. Page 2 Rev. Date: 04/1999 OPSS 337

3 The mix design proportions shall be within the following limits: Residual Asphalt: 7.5% % by dry mass of aggregate Mineral Filler: 0% - 3.0% by dry mass of aggregate The slurry seal material shall be designed so that traffic can resume on the surface within four hours. Two weeks prior to the start of the slurry seal operation, the final mix design shall be submitted in writing to the Contract Administrator together with the results of the tests listed in Table 1. The material shall only be placed after the mix design is reviewed by the Contract Administrator MATERIALS Emulsified Asphalt The emulsified asphalt shall be specially designed for slurry seal work and shall meet the requirements of OPSS Aggregates The aggregates shall be according to OPSS 1001 and the information in Table 2. The aggregates shall meet the physical requirements of HL3 according to OPSS Mineral Filler Mineral filler shall be Portland Cement Type 10 meeting the requirements of CAN/CSA-A5/A8/A Water Water shall be according to OPSS EQUIPMENT Rotary Power Brooms Rotary power brooms shall be capable of cleaning gravel, sand, dirt and other debris from the roadway surface Mixing and Spreading Equipment Mixing equipment shall be specifically designed and manufactured to mix and place slurry seal material. Spreading equipment shall be designed to spread a fine mist of water on the road surface immediately prior to spreading of slurry seal. The spreader box and rear strike-off shall be designed and operated to ensure that a uniform consistency is achieved and to produce a free flow of material to the rear strike-off. The spreader box shall have suitable means provided to adjust the box to compensate for variations in the pavement geometry. The spreader box shall be capable of spreading slurry in one pass at varying widths up to 3.75 m. Page 3 Rev. Date: 04/1999 OPSS 337

4 Alignment Control A stringline or other device shall be provided to ensure that the longitudinal edges of the new surface meet the existing pavement edge CONSTRUCTION Operational Constraints The mixture shall be placed only when the atmospheric temperature is at least 10 C and rising and the weather is free of fog, rain or high relative humidity and there is no forecast of temperatures below 0 C within 24 hours from the time of application. Traffic, including construction traffic, shall be kept off the freshly placed mixture to prevent damage to the surface. Construction of the slurry seal shall be carried out between May 15 and September Documentation A summary of the quantity and application rate of slurry seal placed and a list of the quantities used for each of the components: aggregate, emulsified asphalt, water, mineral filler and additive shall be submitted daily to the Contract Administrator Surface Preparation Surfaces shall be swept clean with a rotary power broom. Areas inaccessible to the power broom shall be cleaned manually Material Application Slurry seal application rates are shown in Table Handwork Areas which cannot be reached with the slurry seal machine shall be surfaced using hand squeegees to provide complete and uniform slurry seal coverage. The area to be handworked shall be lightly dampened prior to mix placement and the slurry applied concurrent with the machine applied process Appearance The finished slurry seal including areas of handwork shall have a uniform texture, free from excessive scratch marks, tears or other surface irregularities. Tear marks in any 12 m 2 area per-lane are considered excessive if there are: a) four or more marks ± 12 mm wide and ± 100 mm long. b) any marks ± 25 mm wide and ± 25 mm long. There shall be no longitudinal ripples, raking, wash-boarding, chatter, or other irregularities that will affect the ride quality. Page 4 Rev. Date: 04/1999 OPSS 337

5 The edges of the slurry seal shall be finished uniform, with a neat appearance along the roadway centreline, lane lines, shoulder, pavement edge and curb lines Joints The longitudinal and transverse joints shall be uniform in appearance with no excessive buildup of material. Slurry seal shall be placed to match lane configurations. The longitudinal joint in the surface course shall have an overlap of 75 mm ± 25 mm Clean Up All areas, such as shoulders and gutters, shall have the slurry seal material removed as specified by the Contract Administrator. Removal of any debris associated with the performance of the work shall be done on a daily basis. Appurtenances shall be free of slurry seal and left in operable condition Repair of Damaged Surfaces Damaged slurry sealed surfaces shall be repaired by the Contractor at his own cost Trial Area A trial area 100 m in length and one lane wide shall be placed at the commencement of the slurry seal operation, to demonstrate the ability to produce slurry seal according to this specification. Within four hours, the Contract Administrator will inspect the slurry seal for conformance. The Contractor shall be required to repeat his operation on a new trial area until the slurry seal placed in the trial area meets the specification. All costs associated with unacceptable trial areas shall be borne by the Contractor. The location of the trial area shall be approved by the Contract Administrator Management and Disposal of Excess Material Management and disposal of excess material shall be according to OPSS QUALITY ASSURANCE Sampling The aggregate shall be stockpiled two weeks prior to construction for sampling and testing. Samples for gradation testing shall be taken from the stockpile as determined by the Contract Administrator MEASUREMENT FOR PAYMENT Actual Measurement Slurry Seal - Type I Slurry Seal - Type II Slurry Seal - Type III Slurry seal will be measured in place by area in square metres. Page 5 Rev. Date: 04/1999 OPSS 337

6 Plan Quantity Measurement When measurement is by Plan Quantity, such measurement will be based on the units shown in the clause under Actual Measurement BASIS OF PAYMENT Slurry Seal - Type I - Item Slurry Seal - Type II - Item Slurry Seal - Type III - Item Payment at the contract price for the above items shall be full compensation for all labour, equipment and material required to do the work with no deductions for appurtenances. Removal, disposal and replacement of any damaged or defective slurry seal is at the Contractor's expense. The accepted trial area shall be paid for at the contract unit price for slurry seal. Page 6 Rev. Date: 04/1999 OPSS 337

7 Test Table 1 Mix Design Requirements Description Requirements Min. Max. ISSA TB-106 Slurry Seal Consistency, cm 2 3 ISSA TB-109 Excess Asphalt, g/m ISSA TB-114 Wet Stripping, % Retained Coating ISSA TB-115 Compatibility * Pass Tests ASTM D3910 Wet Track Abrasion, g/m Set and Cure Characteristics ISSA TB-139 Set Time Traffic Time 12 kg-cm 30 minutes 20 kg-cm 240 minutes * Mixing tests must pass at the maximum expected air temperature. Table 2 Slurry Seal Aggregate Gradation Requirements - LS-602 MTO Sieve Designation Type I, Percent Passing Type II, Percent Passing Type III, Percent Passing 9.5 mm mm mm mm µm µm µm µm Table 3 Slurry Seal Application Rates Type 1 Type II Type III kg/m kg/m kg/m 2 or more Page 7 Rev. Date: 04/1999 OPSS 337