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土木工程材料第四章(參考版)

2024-09-03 08:57本頁面
  

【正文】 ? 砂率 ? 此外水泥品種、骨料種類、粒形和級(jí)配、外加劑、時(shí)間、溫度等,都對混凝土拌和物的和易性有一定影響 Consistency and Slump (稠度) (坍落度) ? Consistency is a measure of concrete’s wetness or fluidity, and depends on the mix proportions and properties of ingredients. ? Measured by ? Slump test 坍落度試驗(yàn) Slump test Slump test ? Mold: slump cone坍落度筒 ? Bottom diameter of 200mm ? top diameter of 100mm ? height of 300mm 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 ? Properl
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