2016-042 Resolution - Laserfiche WebLink

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4.02 TESTING: A. Testing and acceptance of tests of concrete shall be done in accordance with ASTM C31, C39, C94, C 143, C 172, and C 173, D75 and C 136. B. A testing laboratory engaged by the Owner will be responsible for: Supplying 6 inch by 12 inch test cylinder molds to the job- site and taking of cylinder samples. 2. Testing for air, slump, temperature, compressive strength and aggregate gradation. 3. Preparing test reports. C. The Contractor shall supply concrete for all tests. D. Concrete shall be sampled, cured, tested and accepted for compressive strength in accordance with ASTM C172, C31, C39, and C94. Compressive test cylinders shall be prepared in sets of three cylinders for each test. Specimens for each set shall be obtained from the same batch of concrete after about one half of the batch has been placed in the forms. 4.03 STRUCTURES AND FOUNDATIONS: One set per 100 cubic yards of concrete. At least one set shall be obtained for each structure or foundation, except when placing a number of items, each smaller than 15 cubic yards, one set per 15 cubic yards shall suffice. 4.04 FLOORS AND SLABS AT GRADE: One set per 50 cubic yards of concrete. A. Test cylinder sets shall be dated, numbered consecutively, and identified as to location. B. All cylinders shall be immediately stored in an insulated container under wet sand or burlap for about 24 hours after preparation. All vibration or impact shall be avoided during this critical period. C. After initial storage, the cylinders (still in their molds) shall be packed in sealed polyethylene bags, wet sand or other resilient material for shipment to the testing laboratory. D. Concrete slump tests shall be made in accordance with ASTM C 143 and shall be taken as necessary to assure well-placed concrete. E. In -Place Tests: Where questions exist as to the quality of the concrete placed, Engineer may require tests per ASTM C42 or order a load test on structures as