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344-1.2.2 Concrete Work Category 2: Includes the construction of precast <br />concrete including concrete barriers, traffic railing barriers, parapets, sound barriers, inlets, <br />manholes, junction boxes, pipe culverts, storm sewers, box culverts, prestressed concrete <br />poles, concrete bases for light poles, highway sign foundations, retaining wall systems, traffic <br />separators or other structural precast elements. <br />344-1.2.3 Concrete Work Category 3: Includes the work associated with the <br />placement and/or construction of structural cast -in-place concrete requiring a class of <br />concrete specified in FDOT Section 346. <br />344-2 Materials. <br />344-2.1 General: Use concrete composed of a mixture of Portland cement, <br />aggregates, and water, with or without chemical or mineral admixtures that meet the following <br />requirements: <br />344-2.1.1 Portland Cement: Cement shall conform to the requirements of the <br />AASHTO or ASTM designations. Different brands of cement, cement of the same brand from <br />different facilities or different types of cement shall be stored separately and shall not be <br />mixed. Portland cements meeting the requirements of AASHTO M-85 or ASTM C-150 are <br />allowed for LAP concrete. <br />344-2.1.2 Coarse and Fine Aggregates: Aggregates shall meet current FDOT <br />requirements except that source approval by the FDOT is not required. <br />344-2.1.3 Water: Water shall meet current FDOT requirements. <br />344-2.1.4 Chemical Admixtures: Chemical admixtures shall meet current <br />FDOT requirements. Admixtures may be added at the dosage rates recommended by the <br />manufacturer. <br />344-2.1.5 Pozzolans and Slag: Pozzolans and Slag shall meet the current <br />FDOT requirements. <br />344-2.2 Material Storage: Use a concrete production facility that meets the following <br />requirements. <br />344-2.2.1 Cementitious Materials Storage: Provide a separate and clearly <br />labeled weatherproof facility to store each brand or type of cementitious material without <br />mixing or contamination. Provide a suitable, safe and convenient means of collecting <br />cementitious material samples at each storage facility. <br />344-2.2.2 Aggregate Storage: Provide suitable bins, stockpiles or silos to store <br />and identify aggregates without mixing, segregating or contaminating different grades or types <br />of materials. Identify aggregate type/gradation. Handle the aggregates in a manner to <br />minimize segregation and meet the specification requirements when recovered from storage. <br />Continuously and uniformly sprinkle coarse aggregate with water, for 24 hours preceding <br />introduction into the concrete mix. Timers may be used to facilitate the sprinkling of aggregate <br />stockpiles using an alternating on/off method. However, in no event shall the top surface of <br />the stockpile be permitted to become dry prior to batching of concrete. Moisture probes may <br />be used to determine the moisture content of the aggregate. Ensure that the accuracy of the <br />probe is certified annually and verified weekly. Maintain stored aggregates in a well -drained <br />condition to minimize free water content. Provide access for the Engineer to sample the <br />aggregates from the recovery side of the storage facility. <br />01025-32 Technical Specifications <br />FAPublic Works\ENGINEERING DIVISION PROJECTS\0455-8th Street Sidewalk Improvements 18th Ct to Old Dixie\Admim\bid <br />documents\Technical Specifications.doc <br />