Exhibit 3.45(a)

NEW JERSEY DEPARTMENT OF TREASURY DIVISION OF REVENUE CERTIFICATE OF FORMATION MASTER MIX CONCRETE LIMITED LIABILITY COMPANY 0400260751 The above-named DOMESTIC LIMITED LIABILITY COMPANY was duly filed in accordance with New Jersey State Law on 12/02/2008 and was assigned identification number 0400260751. Following are the articles that constitute its original certificate. 1. Nantet MASTER MIX CONCRETE LIMITED LIABILITY COMPANY2. Reoiatearod Agent: i } [ ^ CAPITOL CORPORATE SERVICES, INC. . _ED Reffistered Officet 14 SCENIC DR. DAYTON, NJ 08810 I i OEC 0 2 2008 4. Busineas Purpose. I STATE TREASURE? CONCRETE PRODUCTION AND FABRICATION * “^ “ 5. Effective Date of this filing’ ist 12/02/2008 €. Members/Managerst NYC CONCRETE MATERIALS, LLC 475 MARKET ST., SUITE 302 ELMWOOD PARK, NJ 07407 7. Main Business Addresst 333 CHELSEA RD. STATEN ISLAND, NY 10314 Signaturest CURT M. LINDEMAN AUTHORIZED REPRESENTATIVE Continued on next page .

NEW JERSEY DEPARTMENT OF TREASURY DIVISION OF REVENUE CERTIFICATE OF FORMATION MASTER MIX CONCRETE LIMITED UABILUY COMPANY 0400260751 IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my Official Seal at Trenton, mis 3rd day of December, 2008K. David Rousseau State Treasurer Certificate Number: 113149480 Verify this rertjfirate online at hiips-//vnn»ljuiteJ\).us/rrnt_2latulinsCert/JSP/VtrUy_Cen.)sp