03-12-1984 Council Packet - Laserfiche WebLink

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03300.4.4. Concrete Admixtures: All concrete shall contain a water reducing admixture and shall be air entrained. Air entraining admixtures shall conform to ASTM C260. Water reducing a.mixtures shall conform to ASTM C494, Type A. 03300.4.5. Expansion Material: Preformed expansion joint shall. be bituminous fiber type conforming to ASTM D1751. 03300.4.6. Floor Sealer. Contractor shall furnish and apply two (2) rolled on coats of Tri-Kote 26 clear, manufactured by TK Products, Inc., or an approved equal. First coat shall go on as soon as concrete sets hard enough to walk on. Second coat shall be placed, after careful cleaning of the j surface, just before the project is turned over to the Owner. Both coats shall be carefully and evenly rolled on. Apply floor sealer in strict -, accordance with manufacturer's recommendations and as approved by the Engineer. 03300.4.7. Batching, Mixing, and Delivery Equipment: Use of transit -mixed concrete from approved batching and mixing plant is recommended. Batch, mix, and transport concrete to site in accordance with provisions of ASTM C94. 03300.5. PROPORTIONING: All concrete shall meet the following minimum re- quirements: Minimum compressive strength at 28 days 3500 psi Maximum water -cement ratio by weight .45 Maximum slump 3 inches Entrained air content 4�% + 1�% 03300.6. CONCRETE PLACEMENT: Place concrete in comnliance with practices and recommendations of AST 304 and as herein specified. Deposit concrete continuously or in layers of such thickness that no concrete will be placed on concrete which has hardened sufficiently to cause the forma- tion of seams or planes of weakness within the section. Perform concrete placing at such a rate that concrete which is being integrated with fresh con- crete is still plastic. Deposit concrete as nearly as practicable in its fin- al location to avoid segregation due to handling and flowing. Do not use concrete which becomes nonplastic and unworkable, or does not meet the required quality control limits, or which has been contaminated by foreig❑ materials. Remove rejected concrete from the site and dispose of it in a lo- cation approved by the Engineer. 03300.6.1. Placing Concrete Slabs: Deposit and consolidate concrete slabs in a continuous operation. Consolidate concrete during placement by ude of the w+ specified equipment, thoroughly working concrete around the reinforcemen! and into corners. e� �q 03300-2 0-9693b �,