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' <br /> 1. General Conditions. The following Specifications covers the material under the applicable <br /> documents. Unless otherwise specified, all materials used in the work under this contract shall <br /> conform to the requirements of the current specifications of the American Society for Testing <br /> Materials, and shall be tested In accordance with the current specifications or current methods <br /> of testing of ASTM,where specifications and methods of testing have been adopted, revised,or <br /> proposed for such materials. No materials shall be used on the work until accepted by the <br /> Engineer, and all materials rejected by the Engineer as unsuitable, or not in conformity With the <br /> Plans or Specifications, or failing to pass the required tests, shall be removed immediately from <br /> the work. Failure to condemn materials on preliminary inspection shall not be grounds for <br /> acceptance if future defects are found. All materials and equipment shall be new and free from <br /> all flaws or defects. <br /> 2. Cement. All cement used in mortar, or concrete shall conform to Specifications for <br /> Portland Cement of ASTM C-1 50. Brand of cement proposed for use by the Contractor will be <br /> subject to the approval of the Engineer. Type 11 shall be used In all work. <br /> 3. Sand. All sand used in mortar or concrete shall be clean, sharp, practically free from <br /> loam, clay or vegetable matter, and so graded as to insure workability and watertightness when <br /> mixed with other ingredients. Sand will conform to ASTM Specifications C-33 and when made <br /> into mortar will have a compressive strength at 7 and 28 days of not less than 100% of mortar <br /> made with standard sands. <br /> 4. Coarse Aggregate. Coarse aggregate will consist of broken stone, sound, hard and <br /> iough,—and will conform to the specifications of coarse aggregate given In ASTM Specification <br /> C-33. Stone will be broken to the sizes hereinafter specified under "Concrete" for the various <br /> classes of concrete,and grading will be well within the limits specified. <br /> 5. Water. Water used for mixing concrete and mortar Will be clean, and free from deleterious <br /> amounts of acids, alkalis, and organic materials. <br /> 6. Concrete. All concrete will be made of Portland Cement, water and aggregates as <br /> hereinbefore specified, and will further be in accordance with the following definite requirements <br /> for the various classes: <br /> A design of the mix made by an independent laboratory, approved by the Engineer, for each <br /> class of concrete,will be submitted to the Engineer for approval before concreting is started. <br /> During progress of the work, standard compressive strength test specimens will be made and <br /> cured in accordance with ASTM Standard Method, Designation C-31, and tested, at the <br /> Contractor's expense, by an independent testing laboratory in accordance with ASTM Standard <br /> Method, Designation C-39, at least 3 cylinders will be made for each test. Tests will be <br /> submitted for each fifty (50) cubic yards, or fraction thereof, for each class of concrete used. <br /> Should there be any evidence that concrete does not comply with the specifications, a strength <br /> test may be required at any time. The cost of such strength test or any other tests deemed <br /> necessary by the City in evaluating the adequacy of the concrete shall be the responsibility of <br /> the Contractor. <br /> Class A concrete will have a 28-day compressive strength of not less than 4,000 psi with a <br /> maximum water-cement ration of.48 lbs. per lb. <br /> All concrete shall be Class A-4,000 psi. <br /> MATERIAL SPECIFICATIONS KS-2 <br />