What is the effect of fineness of cement on standard consistency of cement and workability of concrete?

Increasing the fineness of a cement also increases the amount of mixing water required to achieve a given consistency and reduces the amount of bleeding by the concrete.

What are the factors influencing concrete properties?

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.

How does the grading of coarse aggregate affect the properties of concrete?

The grading or size distribution of aggregate is an important characteristic because it determines the paste requirement for workable concrete. The more these voids are filled, the less workable the concrete becomes, therefore, a compromise between workability and economy is necessary.

Why fineness of cement is done?

The fineness of cement has an important bearing on the rate of hydration and hence on the rate of gain of strength and also on the rate of evolution of heat. Finer cement offers a greater surface area for hydration and hence faster the development of strength.

How does the fineness of cement affect the strength gain and heat of hydration in concrete?

Fineness of cement affects hydration rate. The smaller the particle size,the more area available for water-cement interaction per unit volume. Therefore finer cement reacts faster with water and earlier strength gain.

How does the fineness modulus of aggregate affect the strength of concrete?

Fineness Modulus also affects the density of concrete. It increases by about 2.3\% as the FM increases from 2.0 to 3.0. Optimum value of density and other parameters are obtained when FM is 2.8. The optimum value of strength can be taken when workability of concrete is also good.

How fineness and composition of cement affects heat of hydration?

Results showed that the hydration heat generated from cement with higher fineness was larger and faster compared to coarser cements in early ages. The lower w/c resulted in a higher heat of hydration rate at earlier hours but reduced after that. Chemical, mineral composition and fineness of portland cement.

What are the factors affecting the workability of concrete?

Factors which affect workability of concrete are:

• Cement content of concrete.
• Water content of concrete.
• Mix proportions of concrete.
• Size of aggregates.
• Shape of aggregates.
• Grading of aggregates.
• Surface texture of aggregates.
• Use of admixtures in concrete.

How moisture content could affect the properties of concrete?

How Moisture Affects Concrete Strength. Increased space between cement grains: Higher water-to-cement ratios result in greater spacing between the aggregates in cement, which affects compaction. Similarly, increased moisture levels reduce the concrete’s compressive strength and durability.

How does the fineness of cement affect the strength of concrete?

A.: The fineness of cement usually affects the rate at which cement gains strength. It may also have a minor effect on workability but probably not much. If you took a cement and ground part of it to a greater fineness the finer portion would produce higher early strength than the other portion.

What are the factors that affect the drying shrinkage of concrete?

7. The fineness of cement influences the drying shrinkage of concrete. When the water content is increased because of fineness, the drying shrinkage is increased. However, if excessive bleeding due to coarseness of the cement takes place, a reduction in the drying shrinkage occurs.

What is Fineness modulus of cement?

Fineness modulus (FM)is defined as percentage of cement particles whose size is greater than 150 microns. Generally cement with FM greater than 10\% is rejected. That means in 100 g of cement, if the size of more than 10g of cement is greater than 150 microns, such cement can’t be used for making concrete.

Does hydration increase the final strength of concrete?

So, in these types of cement particles, the hydration process is fast as compared to the large particles. But it does not mean that the final strength of the concrete will be increased. Final strength depends on the chemical composition due to which the final strength is going to be more or less.