What is workability of fresh concrete?
Workability of concrete simply means the ability to work with concrete. Fresh concrete is said to be workable if it can be easily transported, placed, compacted, and finished without any segregation. The ease of placing, compacting, and finishing of concrete in the desired manner is called its workability.
What is concrete workability PPT?
Workability of concrete is defined as the ease and homogeneity with which a freshly mixed concrete or mortar can be mixed, placed, compacted and finished. Strictly, it is the amount of useful internal work necessary to produce 100% compaction.
What are the methods of testing workability of fresh concrete?
The concrete slump test or slump cone test is the most common test for workability of freshly mixed concrete which can be performed either at the working site/field or in the laboratory. To maintain the workability and quality of fresh concrete, it is necessary to check batch by batch inspection of the concrete slump.
What increases fresh concrete workability?
Concrete admixtures such as plasticizer and superplasticizers greatly improve the workability. Air entraining agents are also used to increase the workability.
What are the different types of workability of concrete?
Workability of concrete can be divided into following three types:
- Unworkable Concrete.
- Medium Workable.
- Highly Workable Concrete.
What are the types of slump?
There are three types of slump that may occur in a slumps test, namely, true slump, shear slump and collapse slump.
What is meant by Workability?
1. Capable of being put into effective operation; practicable or feasible: a workable compromise. See Synonyms at possible. 2. Capable of being worked, dealt with, or handled: workable clay.
Which test is used for low workability concrete?
compacting factor test
The compacting factor test is designed primarily for use in the laboratory but it can also be used in the field. It is more precise and sensitive than the slump test and is particularly useful for concrete mixes of very low workability and normally used when concrete is to be compacted by vibration.
What factors influence the workability of concrete?
Some of the factors that affect the workability [16] of concrete are quantity of cement, characteristics of cement, consistency, grading of fine aggregate, shape of sand grains, grading and shape of coarse aggregate, proportion of fine to coarse aggregate, percentage of air entrained, type and quantity of pozzolan.
What are the 5 properties of concrete?
The properties of hardened concrete
- Mechanical strength, in particular compressive strength. The strength of normal concrete varies between 25 and 40 MPa.
- Durability.
- Porosity and density.
- Fire resistance.
- Thermal and acoustic insulation properties.
- Impact resistance.
What are the properties of fresh concrete?
We will discuss in details below the different properties of Fresh concrete.
- Workability.
- Setting.
- Segregation.
- Plastic Shrinkage.
- Thermal Shrinkage.
- Thermal Expansion.
- Water Cement Ratio.
What is the workability test of concrete mortar?
workability test of concrete Workability of concrete is defined as the ease and homogeneity with which a freshly mixed concrete or mortar can be mixed, placed, compacted and finished. Strictly, it is the amount of useful internal work necessary to produce 100% compaction.
Which is the best definition of workability of concrete?
Workability of concrete is defined as the ease and homogeneity with which a freshly mixed concrete or mortar can be mixed, placed, compacted and finished. Strictly, it is the amount of useful internal work necessary to produce 100% compaction. 1.
What’s the purpose of the slump test in concrete?
3. Definition A slump test is a method used to determine the consistency of concrete. The consistency, or stiffness, indicates how much water has been used in the mix.