Degree of Workability and their Values as per IS 456:2000 | ||||
Degree of Workability | Where Used | Tests | ||
Slump(mm) | Compacting Factor | Vee Bee Test(seconds) | ||
Very Low | In Road work and compacted with road rollers | * | 0.75-0.8 | 10 to 20 |
Low | Light Reinforced section & Mass Concreting | 25-75 | 0.8-0.85 | 5 to 10 |
Medium | Hevaily Reinforced Section and Pumpable Concrete | 50-100 | 0.85-0.92 | 2 to 5 |
High | Piling Works | 100-150 | >0.92 | *** |
Very High | Trime Pipe | ** | >0.92 | *** |
* Its very low workable to test slump as slump will not collapse means slump will be zero | ||||
* Its so workable to test slump as slump will collapse instantly | ||||
*** Test can not be done as instantly concrete surface will be in plane with glass disk |
PRIME COAT : A prime coat is mainly responsible for protecting the substrate of a construction project before additional layers are added. In asphalt preparation, they can also act as a binder with secondary and tertiary compounds, creating a better adhesion between the layers. Prime coat asphalt acts as an initial sealer in the asphalt laying process to block the other layers from moisture, dust and debris before additional coating installations. Important things to remember about installing a prime coat or prime coat asphalt are: It provides temporary waterproofing, but must have additional compound layers in order for the floor, wall, or ceiling coating to perform long-term waterproofing duties. The asphalt prime coat must completely penetrate the base surface in order to be effective. A prime coat must completely cure before an additional layer is incorporated. It is vital to be aware of weather conditions when apply an asphalt prime coat. In the case of wet weather, thi...
nice explanation about compaction factor test
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