What is the effect of water-cement ratio on the concrete?

In concrete mix design, the water-cement ratio is responsible for binding all constituents of concrete together. If the water-cement proportion is higher, it brings about wider spacing between the cement aggregates and thus, influences the compaction.

How aggregate cement ratio affects the workability of concrete?

Thus the workability of concrete increases. When the weight of cement is less, i.e. aggregate cement ratio is more, then there will be very less cement paste to coat aggregate surfaces and fill the voids, thus, mixing, placing and compacting of concrete will be more harder than previous case.

What is the workability of concrete ratio?

This is concrete with medium workability. It is used in most construction works as it is easier to mix, transport, place and compact without much segregation and loss of homogeneity. Generally it is used in construction with light reinforcement. The water to cement ratio is typically between 0.4 to 0.55.

What are the factors affecting strength of concrete?

Factors Affecting Strength of Concrete

• Quality of Raw Materials.
• Water / Cement Ratio.
• Coarse / fine aggregate ratio.
• Aggregate / Cement Ratio.
• Age of concrete.
• Compaction of concrete.
• Temperature.
• Relative humidity.

What consideration besides strength affect the selection of a water-cement ratio?

According to Abraham’s law the strength of fully compacted concrete is inversely proportional to the water-cement ratio. The degree of workability required depends on three factors. These are the size of the section to be concreted, the amount of reinforcement, and the method of compaction to be used.

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.

Which of the following factors affect workability of concrete Mcq?

Water content or Water Cement Ratio. More the water cement ratio more will be workability of concrete. Since by simply adding water the inter particle lubrication is increased. High water content results in a higher fluidity and greater workability but reduces the strength of concrete.

What factors affect workability?

The Factors that Affect the Workability of Concrete are Given Below:

• Water Content of the Concrete Mix:
• The Size of Aggregates:
• The shape of Aggregates:
• Surface Texture of Aggregates:
• The Porosity of Aggregates:
• Grading of Aggregates:
• Uses of Concrete Admixtures:
• Ambient Temperature:

What is workability and factors affecting workability?

Factors affecting the workability of concrete are materials such as water content, cement concrete, sand and aggregate properties such as size, shape, grading, mix design ratio and use of admixtures. Each and every process and materials involved in concrete mixing affects the workability of concrete.

What are the factors affecting workability?

What are the factors affecting water-cement ratio?

Factors that Affect the Strength of Concrete

• Water/Cement Ratio. The ratio of the weight of water to the weight of cement is called Water/Cement ratio.
• Compaction of Concrete.
• Ingredients of Concrete.
• Curing of Concrete.
• The Shape of Aggregate.
• Maximum Size of Aggregates.
• Grading of Aggregate.
• Weather Condition.

What is the relationship between workability and water content in concrete?

Workability increases with the increase of water content (measured in kg or liter per cubic meter of concrete ). We can express the relation in terms of water-cement ratio. If the water-cement ratio is small, it indicates high amount cement which is helpful for good strength. But the small water-cement ratio is responsible for lower workability.

What is the effect of water cement ratio on concrete?

EFFECT OF WATER CEMENT RATIO ON CONCRETE A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form. Work-ability can be resolved with the use of plasticizers or super-plasticizers. However, a mix with a ratio of 0.35 may not mix thoroughly, and may not flow well enough to be placed.

How does the size of cement affect the workability of aggregates?

When the surface area increases, the requirement of cement quantity also increase to cover up the entire surface of aggregates with paste. This will make more use of water to lubricate each aggregates. Hence, lower sizes of aggregates with same water content are less workable than the large size aggregates.

What happens if you add too much water to concrete?

Too much water will result in segregation of the sand and aggregate components from the cement paste. Also, water that is not consumed by the hydration reaction may leave concrete as it hardens, resulting in microscopic pores (bleeding) that will reduce final strength of concrete.