How can we improve workability of the concrete without changing the compressive strength?
Table of Contents
- 1 How can we improve workability of the concrete without changing the compressive strength?
- 2 How can you improve the workability of concrete?
- 3 Which of the following can reduce the workability of concrete?
- 4 How do you improve the workability of concrete a increase the W C ratio B decrease the W C ratio C decrease the size of aggregates D don’t mix it for longer time?
- 5 Which of the following decreases the workability of concrete?
- 6 What is the workability of concrete and why it is important to control it?
How can we improve workability of the concrete without changing the compressive strength?
How To improve the workability of concrete
- Increase water/cement ratio.
- Increase size of aggregate.
- Use well-rounded and smooth aggregate instead of irregular shape.
- Increase the mixing time.
- Increase the mixing temperature.
- Use non-porous and saturated aggregate.
- With addition of air-entraining mixtures.
How can you improve the workability of concrete?
Explanation: Workability of concrete can be improved by more cement and water with proper water cement ratio. Explanation: Workability should be obtained by the use of a well-graded aggregate which has the largest maximum particle size possible.
What are several factors that can change the workability of fresh concrete over the first 6 hours after it is mixed?
Workability depends on water content, aggregate (shape and size distribution), cementitious content and age (level of hydration) and can be modified by adding chemical admixtures, like superplasticizer.
How can the workability of concrete be reduced?
Use of Supplementary Cementitious Materials The use of steel or synthetic fibers in concrete reduces the workability of concrete as it makes the movement of aggregates harder by reducing the lubricating effect of cement paste. The workability of concrete is reduced and increased based on the quantity of silica fume.
Which of the following can reduce the workability of concrete?
Irregular or partly rounded aggregates – Irregular aggregates may result 35- 37\% of voids. These will give lesser workability when compared to rounded aggregates. Angular aggregates – Angular aggregates result maximum percentage of voids (38-45\%) hence gives less workability and high strength due to interlocking.
How do you improve the workability of concrete a increase the W C ratio B decrease the W C ratio C decrease the size of aggregates D don’t mix it for longer time?
Chemical and Air Entraining Admixtures for Concrete, ACI Education Bulletin No. E4-95.
How will you increase workability of concrete without increasing water in the mix?
The workability of concrete can be enhanced by use of rounded aggregates and by the use of workability enhancing admixtures. With the use of admixture such as air-entraining admixtures, the workability in increased without increase in water-cement ratio.
What are the factors which influence properties of fresh concrete?
Following are the factors that affect the setting of concrete.
- Water Cement ratio.
- Suitable Temperature.
- Cement content.
- Type of Cement.
- Fineness of Cement.
- Relative Humidity.
- Admixtures.
- Type and amount of Aggregate.
Which of the following decreases the workability of concrete?
Angular aggregates – Angular aggregates result maximum percentage of voids (38-45\%) hence gives less workability and high strength due to interlocking.
What is the workability of concrete and why it is important to control it?
In simple words, workability means the ease of placement and workable concrete means the concrete which can be placed and can be compacted easily without any segregation. Workability is a vital property of concrete and related with compaction as well as strength.