Table of Contents
Introduction of No Slump Concrete
No slump value is freshly mixed concrete with a slump test value of less than 25 milimeters. The chemical composition is very much similar to traditional concrete. The main difference is that slump free concrete contains a high amount of aggregate.
Seismic concrete mix designs should be carefully validated using laboratory tests and appropriate adjustments should be made in the field or mix plant to achieve the desired workability and design strength and durability.
The ready-mixed concrete mixture is very hard and must be hardened using vibration techniques. It is mainly used in the construction of roller-compacted concrete and precast concrete because it can retain its shape after installation.
Its Workability
A slump test is commonly used to determine the workability of concrete. When hand wand compaction is performed in the slump test, concrete without slump has poor workability. However, it is considered to have moderate machinability when vibration is applied.
No Slump Concrete Mix
The consistency of the concrete mixture is determined primarily by the equipment, manufacturing methods, and materials used, but choosing a very hard, dry consistency improves durability and increases the strength of the concrete.
The selection of maximum aggregate size is controlled by considering both the minimum dimension of the section and the minimum clearance between rebars, tendons, tendon ducts or other embedded elements.
The maximum allowable maximum aggregate should be used, but this does not mean that smaller aggregates are not recommended, provided that they result in equal or greater concrete strength without affecting other concrete properties. A common and reasonable maximum grain size for reinforced precast concrete such as pipes is 19 mm.
Uses of NO Slump Concrete
- It is used to make curbs.
- No slump concret is used to construct slip molded base.
- Precast concrete components are made by using no slump concrete.
- No slump concrete is used in hydraulic structures.