* Several changes were made recently at Allen Engineering: J. Dewayne Allen is now CEO and Chairman of the Board, Jay Allen is President and Scott Sugg is Vice President of Operations.

* Nawkaw Corp. named Ken Johnson Vice President of Sales.

* Michael Carter was named Southeast Regional Sales Manager for Propex Concrete Systems.

* Mapei named Jeff Leone Director of Strategic Marketing.

* At Blastrac Global, Stephen Klugherz was appointed Global Vice President; at the newly formed Highway and Airport Division, Victor Mah joined as International Technical Director and Greg Bowers as North American Market Manager.