Pavement Preservation Journal - Summer 2013 - (Page 36)

Caution Due in Using MC-30 as Prime Coat By Cynthia Mancha and Abdullah Suzek T he emission of volatile organic compounds (VOCs) by many construction, industry and transportation sources is a widespread problem. In the presence of sunlight, these VOCs react with nitrogen oxides, forming ozone. At the ground level, this pollution can cause respiratory problems, especially in children, seniors, and asthmatics. Highway construction itself emits large amounts of VOCs, due in part to MC-30, a cutback asphalt that contains up to 50 percent kerosene by volume and functions as a prime coat. MC30 emits its VOCs primarily during the curing process, a period after the 36 material is applied to the roadway project when the kerosene is allowed to evaporate. MC-30 emissions can impact not only humans but also vegetation; according to the Environmental Protection Agency (EPA), the resulting ozone can reduce agricultural crop and commercial forest yields, increase susceptibility to diseases, and give rise to pests and harsh weather. MC-30 also can impact those who work directly with the material. Valero’s material data safety sheet for MC-30 warns that, in the short term, the fumes can cause nausea, headache, dizziness, and eye irritation. In the long term, the spec sheet cautions that the kerosene can potentially cause dermatitis, lung damage, and even cancer. Additionally the sheet states that, because of MC-30’s polycyclic aromatic compounds, it can potentially cause anemia and disorders of the liver, bone marrow, and lymphoid tissues. Irregular heart rhythm, coma, respiratory arrest, and sudden death are also cited as consequences of contact with MC-30. MC-30’s flammability also can be a concern, as it has a low flash point between 120 and 140 deg F, making it susceptible to ignition. This is especially acute during the hot summer months, which happen to be the period during which MC-30 is most often applied. View past issues of the Pavement Preservation Journal online at 640397_Deighton.indd 1 11/05/13 3:11 PM

Table of Contents for the Digital Edition of Pavement Preservation Journal - Summer 2013

President’s Message
‘Thinning Up’ Concrete Overlays for Pavement Preservation
IGGA: After Five Years, Colorado CPR Project Holds Strong
Joint Meeting Brings ARRA, ISSA, AEMA to California Desert
At NCAT Preservation Study, Performance Clues Emerge
Integrated System Keeps Fort Collins ‘Asset Smart’
New Alaska Database Aids Treatment Selection
GPR, FWD Analyze Airfi eld Pavements in South Carolina
TPPC: In Texas, Fog Seals Should Last 18 Months
Caution Due in Using MC-30 as Prime Coat
In Nevada, Cold Recycling Preserves I-80
Index of Advertisers

Pavement Preservation Journal - Summer 2013