Pavement Preservation Journal - Fall 2009 - (Page 27)

Field Evaluations of Spray Applied Emulsion Products in California By Dr. Mary Stroup-Gardiner, P.E., and John Fox F og seals are emulsions consisting of asphalt, water and surfactant. Rejuvenator seals are emulsions consisting of petroleum rejuvenating base oils (maltenes, saturates, acidiffi ns). Some contain additional asphalt. Both fog and rejuvenating seals are spray applied to an existing asphalt concrete (AC) pavement surface. Fog and rejuvenating surface seals have been used by agencies over the last several decades. These spray applied seals are used to seal the surface to prevent water and air movement through the AC layers, soften (rejuvenate) the upper few millimeters of an oxidized AC surface and improve the appearance of the driving surface. An additional benefit of surface seals is a reduction in raveling of the AC surface and a slowing of cracking via reduction of the stiffness of the surface layer. The ability of the spray applied emulsion products to achieve their intended goals depends on the application of a sufficient quantity of product with adequate penetration into the pavement surface while minimizing friction loss. The goal is to produce a contract specification for the placement of fog and rejuvenator materials. CALTRANS TESTING PROGRAM The testing program described in this article is the follow-up of Caltrans placement in 2007 of fog and rejuvenating seal coat applications in southern California’s District 9 on Highway 58. The same products (Topein C, CQS, Pass QB, Stryafl ex FB, CRF and Reclamite) have been or will be used to place additional three sets of test sections in northern California, near the towns of Boonville, Alturas and Bishop. The Boonville test sections were placed June 8, 2009; the existing surface was an open graded friction At Boonville, the existing surface was an open graded friction course (OGFC), which had frequent low severity transverse and block cracking, moderate raveling in the right wheel path and occasional low severity longitudinal cracks in the wheel paths. Fall 2009 pavement preservation journal 27 CENTERS

Table of Contents for the Digital Edition of Pavement Preservation Journal - Fall 2009

Pavement Preservation Journal - Fall 2009
Contents
President’s Message
New Guidance Aids Understanding of Polymer Modified Emulsions
First Use of Cationic High Float Emulsion in Alabama County
Micro Surfacing Project Draws Visitors to Indiana Town
NCPP and Industry Partner to Establish Training Scholarships
Field Evaluations of Spray Applied Emulsion Products in California
TVAR Courses Available Online from the Texas PPC
Evaluation of Asphalt Binders Used for Emulsions
Qualitatively Describe Precoat Statusto Track Performance of Chip Seals
AEMA Brings Emulsion Technology to Both America and the World
Pavement Preservation Benefits, Technology in Spotlight at April International Conference
Index to Advertisers
Calendar of Events
Advertisers.com

Pavement Preservation Journal - Fall 2009

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