Attachment 3 FP-14 Dust Palliative Spec.pdf

Section 312

Section 312. — DUST PALLIATIVE

Description

312.01 This work consists of furnishing and applying one or more applications of dust palliative on a prepared surface.

The application method is designated according to Subsection 312.04.

Material

312.02 Conform to the following Subsections:

Calcium chloride, magnesium chloride, and lignosulfonate 725.02 Water 725.01(c)

Construction Requirements

312.03 General. Furnish equipment for spreading and processing dust palliative. Make the equipment available for inspection and approval before use. Do not apply dust palliative when raining, rain is anticipated within 24 hours of application, or when the ground is frozen. Apply when the ambient air temperature is 40 °F (4 °C) or above.

Protect structures and trees from splatter or marring. Use multiple applications at a reduced rate if necessary to prevent runoff. Prevent discharge of dust palliative into waters of the United States as defined by the Clean Water Act.

312.04 Surface Preparation and Application.

(a) Method 1. Single application. Blade and shape the roadbed. Leave 1 to 2 inches (25 to 50 millimeters) of loose material on the surface. Water the loose material so it is visibly moist.

Thoroughly mix the moist loose material.

Apply water, calcium chloride, magnesium chloride, or lignosulfonate liquid at a rate of 0.25 to

0.50 gallons per square yard (1.00 to 2.25 liters per square meter) as approved by the CO. Apply calcium chloride flakes at the rate of 1.0 to 2.0 pounds per square yard (0.5 to 1.0 kilograms per square meter) as approved by the CO. Process the dust palliative uniformly throughout the loose material.

Moisten the mixture as necessary and compact by operating rollers over the full width of each layer until visual displacement ceases.

(b) Method 2. Two applications of calcium chloride or magnesium chloride liquid.

(1) First application. Scarify, blade, and shape the roadbed. Leave 3 inches (75 millimeters) of loose material on the surface. Water the loose material so it is visibly moist. Thoroughly mix the moist loose material.

Section 312

Apply calcium chloride or magnesium chloride liquid solutions with a distributor at a rate of

0.50 to 1.0 gallons per square yard (2.25 to 4.50 liters per square meter) as approved by the CO.

Use a tractor rotary tiller, or other approved mixing device, immediately behind the distributor to incorporate the water solution into the full width of loose material. Shape the surface to line and grade and compact according to Subsection 204.11(a).

Allow at least one week of curing time between the first and second applications.

(2) Second application. Apply calcium chloride or magnesium chloride liquid to the finished surface at a maximum rate of 0.20 gallons per square yard (0.9 liters per square meter) as approved by the CO.

312.05 Opening to Traffic. Keep traffic off the treated surface until the dust palliative has penetrated and cured to prevent excessive pickup under traffic.

312.06 Acceptance. Dust palliative material (calcium chloride liquid, calcium chloride flake, magnesium chloride liquid, and lignosulfonate liquid) will be evaluated under Subsection 106.03. Provide a commercial certification that includes the date, identification number (truck or trailer), net mass, and brand name with each shipment. For liquid dust palliatives provide the net volume and specific gravity at 60 °F (15 °C), percent solids by mass, and pH. For solid dust palliatives provide the concentration of the product.

Application of dust palliative will be evaluated under Subsections 106.02 and 106.04.

Measurement

312.07 Measure the Section 312 pay items listed in the bid schedule according to Subsection 109.02.

Payment

312.08 The accepted quantities will be paid at the contract price per unit of measurement for the Section 312 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.