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Unformatted text preview: Thermometer Concrete mixer power driven revolving drum; tilting Procedure Mix concrete in a suitable mixer or by hand; allow for 10% excess Before starting rotation, add coarse aggregate, some mixing water and solution of admixture Start mixer; add fine aggregate, cement, and water; mix for 3min, pause for 3min, mix again for 2min Deposit machine-mixed concrete in a clean, damp mixing pan; remix by shovel until uniform Select portions of batch to be used in tests; cover concrete when not being mixed or sampled Measure slump; measure air content; measure yield; measure temperature Mold specimens near to location of storage Place concrete into molds using scoop, blunted towel or shovel Consolidate specimens according to slump size Post-Lab Test Conditions Test Conditions were normal for this procedure. Results Samples were placed in molds and allowed to cure. Comments The procedure was followed as written and everything proceeded normally....
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- Spring '08