Why Not?
Chip seals are a relatively inexpensive maintenance technique used to increase skid resistance and prolong the life of a pavement which is structurally sound but has some surface distress. Traditionally, chip seals have been limited to low traffic volume roads. Why? The standard answers to that question are: 1) vehicle damage, especially broken windshields caused by flying chips; 2) premature failure; and 3) road noise.
Why Now?
New technologies are providing solutions to the traditional problems. Many agencies have found that SemMaterials high performance materials, and systems yield cost-effective, high quality, high macro-texture, lasting pavement surfaces. The typical life expectancy is 5 to 7 years, but some polymer modified emulsion chip seals are lasting even longer.
Eligible for Federal Funds
Kansas, Michigan, Louisiana, Arkansas, Wyoming and New Mexico are just a few of the states that routinely use polymer modified emulsion chip seals on state highways and Interstates. They have been recommended for use on highways with greater than 7500 vehicles per day per lane on four lanes. The recent highway bill now authorizes the use of federal funds for maintenance techniques. The FHWA recognizes:
- A chip seal waterproofs the surface, seals small cracks, and improves surface texture.
- A smooth surface affects not only the riding comfort, but also decreases road user costs. Smooth surfaces decrease vehicle maintenance costs, fuel costs and traveling time.
- A renewed surface extends service life by restoring protection against aging, oxidative deterioration and traffic abrasion.
Techniques for Success
There are several techniques that have worked in successful chip seal projects on Interstates and other high traffic volume pavements. Of primary importance are selecting the right materials and construction processes. Seal Coats on high volume traffic pavements need the extra performance that is given by SemMaterials Products. We've learned that materials selection, chip seal design, site selection (where chip seals are and aren't appropriate), pavement conditions, climate, equipment qualification and calibration, construction techniques, quality control and traffic control can make or break the success of a chip seal.
Contact your local SemMaterials Representative, who can help with selecting the right high performance chip seal or other treatment for your pavement.