土木工程材料第四章(文件)
【正文】 0mm Procedure of Slump test a. Fill the cone using standard procedure b. Strike off excess c. Raise the mold and measure the displacement of the original center of the specimen Slump ? In the slump test, the number of mm the original center of the cone sinks or settles uniformly is measured to the nearest 5 mm. The measurement is called slump. ? . slump can be 75, 80, 85mm, etc. Types of slump ? Nearzero slump ? Very dry mix ? Normal slump ? Properly proportioned concrete ? Shear slump ? Concrete lacks plasticity and cohesion ? Collapse slump ? Lean, harsh or extremely wet concrete Remended slumps for various type of construction Type of construction Slump (mm) Max Min Footings, caissons, foundation walls and substructure walls 75 25 Beams, columns and walls 100 25 Pavement and slabs 75 25 Mass concrete 50 25 Factors affecti
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