Ontario ENGINEERING STANDARD SPECIFICATION 1.0 PURPOSE 2.0 MATERIALS

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1 1/8 1.0 PURPOSE This specification describes the minimum gradation and physical property requirements and describes acceptable material qualities, handling, storage and delivery of earthfill materials. 2.0 MATERIALS Gradation and physical property requirements of earthfill materials shall meet and be performed as specified in OPSS.PROV. 1010, Table 1 and 2 attached. 2.1 GRANULAR A AND M Granular A and M aggregates shall consist of crushed rock composed of hard, uncoated, fractured fragments, produced from rock formations or boulders of uniform quality, or a mixture of crushed gravel, sand and fines composed of hard, durable, uncoated particles, produced from naturally formed deposits, or crushed slag produced from iron blast furnace or blended nickel slag. Granular A means a set of requirements for dense graded aggregates intended for use as granular base within the pavement structure, granular shouldering, and backfill. Granular M means a set of requirements for dense graded aggregates intended for use on unpaved road surfaces and for the maintenance of unpaved shoulders. Aggregates for Granular A and M shall be produced from one or a blend of the following: a) Boulders, cobbles, gravel, sand, and fines from naturally formed deposits. b) A quarry or talus. c) Reclaimed hydraulic cement concrete. d) Iron blast furnace slag or nickel slag. Excluding engineered fill under foundation, granular A and M aggregates may include up to 0% by mass of asphalt coated particles derived from RAP, and not more than a combined total of 15% by mass of glass or ceramic material or both, unless specified elsewhere in the Contract Documents. Granular A or M produced with RAP containing steel slag aggregates is acceptable for unpaved shouldering purposes only. Such materials shall be stockpiled separately. 2.2 GRANULAR B Granular B aggregates shall consist of clean, hard, durable uncoated particles obtained from deposits of gravel or sand, talus rock, quarried rock, iron blast furnace or blended nickel slag, clinkers, or other suitable granular materials.

2 2/8 Granular B means a set of requirements for well-graded aggregates intended for use as granular subbase within the pavement structure and granular backfill. Granular B may be either Type I or Type II as described below. Granular B may be of Type I, Type II, or Type III. Aggregates for Granular B shall be aggregates produced from one or a blend of the following, subject to the following restrictions: a) Boulders, cobbles, gravel, sand, and fines from naturally formed deposits. b) A quarry or talus. c) Reclaimed hydraulic cement concrete. d) Iron blast furnace slag or nickel slag. Excluding engineered fill under foundations, aggregates for Granular B Type I and Type III may include up to 0% by mass of asphalt coated particles derived from RAP, and not more than a combined total of 15% by mass of glass or ceramic material or both. RAP containing steel slag aggregates shall not be permitted. Aggregates for Granular B Type II shall only be produced from a quarry or from talus, Recycled materials and reclaimed slag products shall not be permitted. 2. SELECT SUBGRADE MATERIAL (SSM) Aggregates for select subgrade material shall be produced only from natural deposits of nonplastic silt, sand, and gravel material. Recycled or reclaimed materials of any type shall not be permitted. 2.4 CRUSHED MINEROCK Rock that has been primary crushed in a jaw crusher to minus 8 inches free of rubble, organic and foreign matter, slimes, frozen lumps, frost and ice. 2.5 ACCEPTABLE NATIVE MATERIAL Native materials free from rubbish, wires, cans or debris of any sort; boulders or rock greater than 1/ cu. ft., concrete or masonry fragments greater than 6 inches in their largest dimension; and roots, stumps, trees, timber, or frozen and organic material. Use native materials as earthfill if approved by the engineer or specified on the project documents. 2.6 BURRIED PIPELINE BEDDING MATERIALS Refer to Vale specification SPEC-1101.

3 2.7 CONCRETE AGGREGATES /8 Coarse and fine aggregates for concrete shall be in accordance with the physical requirements and gradations of CSA-A DELIVERY, STORAGE AND HANDLING OF Handle, store and deliver earthfill materials by methods and equipment which avoid segregation and avoid contamination by deleterious material. Do not drop earthfill materials from heights that may cause segregation or excess loss of fines. Store all earthfill materials in a manner that permits free drainage. Stockpile earthfill materials far enough apart or separated by substantial dividers to prevent intermingling. Stockpile materials on stable surfaces or on a compacted sand base not less than 12 inches in depth to prevent contamination of the piled materials. Build up stockpiles in layers of feet depth, place material over the entire stockpile area before beginning the next layer. Do not construct stockpiles with bulldozers. Do not cone a pile or spill material over the edges of the piles. Maintain stockpiles of each class of crushed or screened granular fill in areas designated by the Vale Representative to meet scheduled requirements for the project. 4.0 QUALITY CONTROL The Contractor shall be responsible for all Quality Control sampling and testing required to show conformance of the earthfill with this specification. Either the stockpile/pit-run method or control chart method shall be used. These records shall be made available to the Vale Representative upon request. Where the stockpile/pit-run method has been selected, test data shall be obtained from samples taken from stockpiled or pit-run material to be used in the work. Where the control chart method has been selected, control charts shall be prepared in accordance with recognized methods (Ministry of Transportation of LS624 method is acceptable). Each control chart shall contain information regarding control limits, specification limits, target values, testing frequencies, sampling locations, and time period over which the testing has taken place. Each control chart shall include individual test data of the most recent sample indicated on the chart.

4 4/8 Employ all operating and supervisory personnel who are fully skilled and experienced in the operation and maintenance of the aggregate plant to produce the required materials. Notwithstanding any testing of Granular A, B, M or Select Subgrade Material, remove the material observed visually by the Vale Representative that is outside the specification requirements. 5.0 SUBMITTALS Submit to the Vale Representative when requested: - proposed methods of pit operation and proposed dewatering methods. - local regulatory permits and approvals for aggregate pit operation. 6.0 REFERENCE DOCUMENTATION The following documents are related to this specification and shall be used to their latest revision: CSA - A2.1 OPSS.PROV Concrete Materials and Methods of Concrete Construction Provincial Standard Specification, Material Specifications for Aggregates - Base, Subbase, select subgrade, and Backfill Material

5 5/8 7.0 REVISION AND TRANSITION NOTES Revision notes describe: what was changed, and if applicable, why it was changed, and the plan to implement the change, including whether changes are retroactive. Note: The revision notes are a summary of the changes and may not necessarily be a complete list. Rev 1 Description Document format and number changed due to Vale Engineering Document Program changes in Previous Standard number was Rev 4 Revision by Approved by Issue Date YYYY/MM/DD K.Clausen A.Alaeddine 2012/04/0 2 Approved for use in Thompson, MB - No changes. K.Clausen A.Alaeddine 2012/08/09 Document Reviewed Format updated Regional approvals removed - Specification updated to reflect changes made to OPSS.PROV April 201 K.Clausen A.Alaeddine

6 6/8 8.0 APPENDICES Appendix A: Table 1 - Physical Property Requirements Appendix B: Table 2: Gradation Requirements Percent Passing

7 7/8 Appendix A: Table 1 - Physical Property Requirements Laboratory Test MTO Test Number A Type I / Type III B Granular Type II M O Select Subgrade Material Unconfined Freeze- Thaw, % maximum loss LS Micro-Deval Abrasion (Coarse Aggregate), % maximum loss LS (Note1) (Note1) Micro-Deval Abrasion (Fine Aggregate), % maximum loss LS N/A Amount of Contamination LS-60 (Note 2) Plastic Fines LS-61 NP (Non-Plastic) Determination of Permeability, k LS--709 (Note ) Notes: 1. The coarse aggregate micro-deval abrasion loss test requirement shall be waived if the material has more than 80% passing the 4.75 mm sieve. 2. Granular A, B Type I, B Type III, or M may contain up to 15% by mass crushed glass or ceramic material or both. Granular A, O, B Type I, B Type III, and M shall not contain more than 1.0% by mass of any combination of wood, clay brick, gypsum, gypsum wall board, or plaster. Granular B Type II and SSM shall not contain more than 0.1% by mass of wood.. For materials north of the French/Mattawa Rivers only, the coefficient of permeability, k shall be greater than 1.0 x 10-4 cm/s or alternatively, when past field experience has demonstrated satisfactory performance. Prior data demonstrating compliance with this requirement for k shall be acceptable provided that such testing has been done within 5 years of the material being used and field performance has continually been shown to be satisfactory.

8 8/8 Appendix B: Table 2 Production Requirements Lab Test Sieve Analysis, % passing Percent Crushed Particles, % minimum 2 or more Crushed Faces, % minimum Asphalt Coated Particles, Coarse Aggregates, % maximum MTO Test Number LS-602 (sieve) Granular A B M O Type I (Note 2) Type II Type III (Note 2) 150 mm mm mm mm mm 1.2 mm 9.5 mm 4.75 mm ( ) Note ( ) Note ( ) Note ( ) Note SSM mm micro m micro m micro m ( ) Note ( ) Note ( ) Note ( ) Note LS LS Note 5 LS Notes: 1. When Granular B is used for granular backfill for pipe subdrains, 100% of the material shall pass the 7.5 mm sieve. 2. When RAP is blended with Granular B Type I or Type III, 100% of the RAP shall pass the 75 mm sieve. Conditions in Note 1 supersede this requirement.. When the aggregate is obtained from an iron blast furnace slag source. 4. When the aggregate is obtained from a quarry or blast furnace slag or nickel slag source. 5. When Granular O is produced from boulders, cobbles, or gravel retained on the 50 mm sieve. -