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4.8.4 Pipe Penetration and Block-out Water stop <br />Water stop for pipe penetrations of concrete walls and for grouted <br />block-outs shall be ADEKA MC-2005T or ADEKA MC-2010M, as <br />manufactured by ASAHI DENKA. <br />4.8.5 Adhesive <br />Adhesive shall be 3M-2141 as manufactured by the 3M Company <br />or 3M-2141 Bonding Agent as manufactured by Adeka. Caulking <br />sealant for rough surfaces of concrete shall be Adeka P-301. <br />4.9 SEALANTS <br />4.9.1 Sealants for formed or saw-cut control joints sha{I be Avanti AV- <br />510 Low-Mod Epoxy Gel Two Part gun-grade flexible sealant or <br />approved equivalent. <br />5 PROPORTIONING <br />It is the intent of this specification to secure, for every part of the work, concrete <br />of homogeneous structure which when hardened shall have the required strength, <br />impermeability, and resistance to chemicals and weathering. <br />5.1 CONCRETE STRENGTH <br />5.1.1 Structural concrete shall be proportioned to achieve a minimum <br />twenty-eight (28) day compressive strength of 4,000 psi. <br />5.1.2 Lean concrete fill shall be proportioned to achieve a minimum <br />twenty-eight (28) day compressive strength of 1,500 psi. <br />5.2 PROPORTIONING LIMITATIONS <br />5.2.1 Structural Concrete <br />Water-cement ratio will not be greater than that required for <br />workability, as determined by the Engineer. In no case shall the <br />water-cement ratio exceed 0.45. If a pozzolan is used in the <br />concrete, the maximum water-cement plus pozzolan ratio shall not <br />exceed 0.45. Workability of the concrete mixture shall be such <br />that it may be readily worked into corners and angles of forms and <br />around reinforcement without permitting materials to segregate, or <br />free water to collect on the surface. Ordinary structural concrete <br />shall contain cement amounts proportioned to meet or exceed the <br />design strength in accordance with ACI 301 and ACI 211.1 unless <br />otherwise approved by the Engineer. <br />SPEC B -CONCRETE <br />PAGE 8 <br />