ASPHALT ANSWERS
Machines have changed over the years , but the fundamentals are the same
As I was preparing for my virtual presentation for World of Asphalt last month , I ran across an old Blaw Knox Paving Manual that was about 25 years old . As I was thumbing through this typewritten museum of old knowledge , I couldn ’ t help but chuckle at some of the terms I ran across . The contents mentioned free floating screed , crown and valley as well as hot joints . The glossary contained antiquated words like flow gates , angle of attack and tow points . Wait a minute . These are the same topics I discuss in every Best Practices seminar I conduct . Am I that far behind in the trends ? Nope . The bones are the same , we have just put fresher paint on the machine . I was intrigued as I read further into this manual , so I decided to do a little more research . Of course , my research led me to the crawler-mounted Barber Greene 879 paver that was perfected after the great depression . The asphalt mix was received and carried in a front hopper , passed under the machine by
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