Property Management Guide: Standard Specs for Seal Coat

PROPERTY MANAGEMENT GUIDE:
SPECIFICATIONS
for SEAL COAT

1.01 SCOPE

This work shall consist of mixing polymer modified asphalt emulsion, aggregate, mineral filler, additives, and water and spreading the mixture on a surfacing or pavement where shown on the plans, as specified in these special provisions, and as directed by the Engineer. The mix should be capable of being spread in single layers. Which, after curing and initial traffic provides a hard wearing protective surface.

2.01 MATERIALS

The seal coat materials shall conform to the following requirements:

2.02 (a) ASPHALT SEAL COAT EMULSION

Asphalt emulsion shall be homogenous and shall be a polymer modified slow setting anionic asphalt emulsion conforming to the requirements below. The polymer material shall be milled or blended into the asphalt or blended into the emulsifier solution prior to the emulsification process.

Tests on Emulsion
Test	Requirement
Viscosity cp Rotational Viscometer	100 cp min 25C
Specific Gravity	1.2 min
Solubility In water	100% dispersible
Residue by distillation	59 % min

Tests on Residue
Test	Requirement
Dehydration 100F 96 hrs	0.6 min
Solubility in CCl3	15 % min
Loss on Ignition%	20% max

2.02 (b) MINERAL FILLER

Mineral filler shall be any washed crushed sand or similar aggregate of no more than 5mm top size. ( 40-90 mesh). It may be added if required.

2.02 (c) WATER

Seal Coat can be diluted by up to 20% water, depending on surface conditions.

2.03 MIXING

The materials shall be mixed in a suitable seal coat mixer and delivered to site. Or the materials may be mixed on site.

2.04 PLACING The seal coat may be placed with a self propelled spreading machine or by hand

Rates shall be: (undiluted basis)

Smooth dense pavement:	2.0 gallons per 100 ft2
Medium Surface:	3.0 gallons per 100 ft2
Rough Surface:	2 coats: Coat 1:add 2 lbs per gallon of 40-90 mesh sand then apply at 3 gallons per 100 ft2 Coat 2: 2 gallons per 100 square ft neat.

Seal Coat shall only be placed when the ambient and pavement surface temperature is 10°C (50F) minimum and rising. Seal Coat shall not be placed if rain is falling or is imminent or if there is the possibility that the finished product will freeze within 24 hours.

Before placing the seal Coat, the pavement surface shall be cleaned by sweeping, flushing or other means necessary to remove all loose particles of paving, all dirt and all other extraneous material.

Allow to dry before allowing traffic- 12-24 hrs.