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Board of Commissioners, Cabacrus County, North Ca~olina <br /> LAW P~oposal No. 013~I1C <br /> April 1, 1991 <br /> {Revised April 19, 1991) <br /> <br /> Roller Compacted Concrete <br /> <br /> - Perform density and moisture content measurements of roller compacted <br /> concrete du~inE placement. A minimum of one compaction test per 100 cy <br /> placed will be performed. <br /> <br /> - Perform moisture.~ content measurements at the puE mill pr/or to placement. <br /> <br /> - Monitor placement and curie§ of roller compacted concrete. <br /> <br /> - Prepare ~ minimum of ~ sets of roller compacted concrete cylinders (6 <br /> cylinders per set): The cylinders will be cast in 6 by 12 inch metal <br /> split compaction mold p~ovided by HDR. Samples will be compacted in 2 <br /> inch lifts with 50 blows of a modified Proctor hammeF (10 lb 18 inch <br /> drop) per lift. Two cylinders will be tested for compressive strength at <br /> 7 days, two at 28 days end two at 56 days. <br /> <br /> Asphaltkc Concrete PavinK <br /> <br /> - Inspect sub,rede before placement of base materials. <br /> <br /> - Perform density and thickness tests in base materials to verify that they <br /> are properly compacted and of sufficient thick, ess: at least one test per <br /> 500 ft of roadway. <br /> <br /> - Make field density and thickness measurements of /n-place asphaltic <br /> concrete: at least one test per 900 ft Of roadway. <br /> <br /> - Provide batch plant inspect/on to observe batchin~ procedures and to <br /> perform necessary tests to make adjustments to keep the mix percenta§e in <br /> the specified ranEes. <br /> <br /> - Inspect ~eneral headlinE, placement, and rollffu~ procedures in the field. <br /> <br /> PHOJECT STAFF <br /> <br /> In o~der to effectively perform t~esa services to coordinate our <br /> activities with the contractor and the site enEineer, and to provide prompt <br /> re~ponaive service, we propose to assiEn en en~ineerinE tecknicisn with four <br /> to six years experience. The technicians provided will be satisfactory to HDH <br /> Engineering, Inc., actin~ as Owner's Rep~esentative on this project, in <br /> _respect to the technician's level of _e~oerience and work/n~ relationships with <br /> Owner's, Engineer's (HDH), and Contractor's personnel assigned to this <br /> project. He would be assisted on an a~-needed basis by add/t/onal experienced <br /> technicians to include sdd/tiooal support for blast monitor/nE durinE blast/nE <br /> periods. As requested, we will provide on site, an office laborator~ faoility <br /> to provide on-site laboratory testinE as needed. Since our Charlotte <br /> laberatoroy is located within one hou~ of the project, we would not anticipate <br />I the need to perform compressive stz~n~th test/nE or Proctor compaction tests <br /> on site. However, if th/s is desired, we can provide these aery/cas on site. <br />I lAW ENGINE£RING <br /> <br /> <br />