Standard Specifications Manual Training 3400 Specification for Binder

Standard Specifications Manual Training 3400 - Specification for Binder, Filler and Blender Sand TSB Construction Standards February 28, 2012

What is BFB? • Binder, filler and blender sand is a material that is used to improve the gradation requirements and / or overcome stability problems in: – Hot-mix aggregate – Base course – Sub-base

Binder • A very fine, low plastic aggregate • Used to stabilize base courses and improving compaction • Increases the amount retained on the bottom end of the sieve designations (400 µm, 160 µm, and 71 µm) • Generally use when the base is “too clean” Tips - what to watch for: • Does not throw out other sieve designations • Look at the 900 µm sieve: if it is at the top of the band there may be limited room to add binder – Binder will increase the % retained on the 900 µm – May need to reject more to make room in the 900 µm band, which throws out the bottom end

Filler • A fine, non-plastic aggregate • Used to modify the gradation of hot-mix aggregate to produce a dense asphalt mix • Fills voids between the aggregates • Increases the gradation of the bottom end of the sieve designations (400 µm, 160 µm, and 71 µm)

Blender • A fine, non-plastic aggregate • Used to modify the gradation of hot-mix aggregate to increase the air voids in the asphalt concrete (open up the mix) • Used to “clean up” the bottom end of the sieve designations • Increases the gradation of the middle sieve designations (900 µm and 400 µm) • Generally need when the natural fines and/or crushed fines are too dirty • Replacing some of the natural fines with blender

Work Description Removing overburden Excavating Loading stockpliling spreading at site Hauling Adding material at screener, crusher, Screening Dumping and or

Materials • Ministry provides the sources • Material – fine graded mixture of sand, silt, and/or clay • Material properties: Sieve Designation % by Weight Passing Binder Filler Blender Sand 5. 0 mm 100 100 400 µm 100 90 25 71 µm 50 25 10 Max. Plasticity Index 10 0 0

Construction • Ministry determines if screening is required – 5 mm slotted screen • Must be added using a separate conveyor – Provides uniform feed rates and better mixing • Quantity needed will be determined by the Engineer

Measurement • Measurement: – By tonnes • Haul: – measured from the source to the mixing site on the basis of haul routes approved by the Engineer

Payment • Rate stipulated in the Special Provisions • Full compensation for the work except for those activities for which specific provisions for payment is made in the Spec: – Ex. Hauling, removal of overburden • Hauling at applicable Standard Haul Rates stipulated in the Special Provisions • Removal of overburden – in accordance with Spec 2260 or Extra Work • No compensation for excess quantity stockpiled at the mixing site or the haul

Rates from Special Provisions Processing Aggregate Subject Rejecting aggregate in excess of 10% Screened Aggregate Pea Aggregate Natural Fines Aggregate Interim processing of sub-base aggregate and binder, filler or blender sand Processing of all other Interim Products Reference 3200. 6. 1. 2. 1 3200. 6. 2. 2 3200. 6. 4. 2. 1 Rate or Surcharge $3. 00 per tonne $1. 50 per tonne $2. 75 per tonne 3200. 6. 4. 2. 1 $6. 50 per tonne Binder, Filler and Blender Sand Subject Mobilization without screener (per source) Mobilization with screener (per source) Binder, filler or blender sand (BFB) not screened BFB screened Reference 3400. 5. 1 Rate or Surcharge $1, 000 lump sum $2, 000 lump sum $3. 00 per tonne 3400. 5. 1 $5. 00 per tonne Standard Haul Rates Haul Distance Loading Fee Haul Fee Primary Weights Secondary Weights < 12. 0 km $1. 00 / t $0. 20 / t. km $0. 23 / t. km 12. 0 to 20. 0 km $0. 75 / t $0. 20 / t. km $0. 23 / t. km > 20. 0 km $0. 00 / t $0. 20 / t. km $0. 23 / t. km The conversion factor from cubic metres to tonnes will be 1. 7.

QUESTIONS?