Sealcoat History

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HISTORY

The City of Amarillo has had preventive maintenance programs, in one form or another, for many years. Available historical records clearly indicate the City has been Seal Coating paved streets for over 80 years. Some of the products have changed over the years, but the basic process of placing liquid asphalt and gravel onto the road surface as a preventive maintenance activity has not. One thing that has definitely changed over the years is the quantity of streets that must be maintained.

history of seal coat

 

 

 Year  Est. Population  Area of City (Sq. Miles)  Paved Streets (Miles)
 1950

 74,246

22.401 

 110.50

 1961

 138,000

54.78

382.94

 1970 

 127,000

 63.30

 576.40

 1980

 157,180

 81.40

 699.95

 1990

 160,422

 87.21

 776.50

 2000

 174,727

 89.43

 839.36

 2010

 194,527

 100.24

 911.12

Prior to 1990 the City's seal coat program was touching every paved residential street and alley on a seven year cycle. Between 1990 and 2000 the cycle of seal coating was extended to eight years. Paved alleys were dropped from the seal coat program in 1998 and a new "alley seal" program was put in place. In 2002 the cycle was adjusted to ten years.

The cycle rate is determined by the amount of resources (materials, equipment and labor) available each year to cover the miles of paved streets in the city. The reason behind the cycle rate increase in miles of paved streets without a corresponding increase in resources.           

In 2009 the Street Division begun to use pre-coated gravel rock in the program. Reasons behind this decision are not only for aesthetics but it also reduces the amount of rock and liquid asphalt needed. Pre-coated gravel rock has reduced the total time involved. Using uncoated gravel rock required an additional week or two of sweeping to pick up the loose rock that did not bind.