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• Iron content: 0.3 ppm maximum. <br />• Total solids: 2000 ppm maximum. <br />If ice is used in the concrete mix to replace water, ice shall be made from water that meets <br />all of the above requirements. <br />2.5 Admixtures <br />All admixtures shall conform to ASTM C494, where applicable. <br />The Contractor shall use admixtures to produce aself-compacting concrete that is <br />pumpable, essentially self-leveling, requires no vibration and resists segregation. The <br />admixtures required to produce this type of concrete are consistent with the required <br />properties of workability, volume stability and low water-cement ratio. The Contractor <br />shall use admixtures manufactured by Master Builders Technologies or approved equal. <br />2.6 Target Properties of the Concrete Mix <br />The Contractor shall develop and proportion acement/fly ash concrete mix for use in <br />constructing the plug. Fly ash shall be added to the mix to minimize the heat of hydration <br />produced by the resultant mix. <br />The Contractor shall demonstrate by trial mix that the proposed concrete meets the <br />following properties: <br />Target properties for Plug Concrete <br />Property Comment <br />Workability. Range of Slump Flow Value 26 to 30 inches at delivery <br />to the concrete pump. This value must not vary by <br />more than 2 inches over the following 60 minutes. The <br />Slump Flow Test must result in a flat, approximately <br />circular shaped mass of concrete that shows no sign of <br />segregation, having a uniform distribution of coarse <br />aggregate within the mortar matrix. There shall be no <br />sign of any halo of mortar around the outside of the <br />resulting disc of plastic concrete. <br />Self-compacting. Use appropriate additives (see Section 2.5 <br />Admixtures). <br />Less than 25 °F heat rise prior Difference between initial condition and temperature <br />to placement. after 4 hrs. <br />03300-5 <br />