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Who We Are The leading voice for the crushed stone ready mixed concrete sand and gravel and cement industries039 community. The Team PELA is a 10month hybrid program with online and inperson educational sessions and networking opportunities. Careers in the Aggregates Concrete Cement Industries Join PACA The Pennsylvania Aggregates and Concrete Association PACA is the industrys unified voice representing more than 200 member companies across the state. Creating a unified and strong voice for our industry.