Why is it recommended to use smaller aggregates in high strength concrete?

Smaller aggregate sizes are also considered to produce higher concrete strengths because of less sever concentrations of stress around the particles, which are caused by differences between the elastic module of the paste and the aggregate.

What if the the aggregate used in the concrete is having higher silica content?

The purpose of this program is to delineate those properties, geological, chemical, or physical, of a carbonate rock which determine whether or not that rock will serve satisfactorily as coarse aggregate for concrete highway construction.

How does maximum aggregate size effect strength?

A. As the nominal maximum size of the aggregate is increased, the amount of water needed for the same workability is reduced. At the same cementitious material content, strength is therefore greater because the w/cm is lower.

What are the limitations of high performance concrete?

Disadvantages of high performance concrete:

• These HPC have extended quality control.
• This concrete has a high cost.
• They are special constituents.
• They are manufacture and placed carefully.

Why is aggregate sample reduction Important?

Aggregate and other materials sampled in the field need to be reduced to appropriate sizes for testing. It is, therefore, necessary to reduce field samples while minimizing the chance of variability during handling.

Why does concrete shrinkage occur?

Drying shrinkage happens mostly because of the reduction of capillary water by evaporation and the water in the cement paste. The higher amount of water in the fresh concrete, the greater the drying shrinkage affects. Concrete shrinkage occurs mostly due to the evaporation of the mixing capillary water.

What are the factors affecting 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 might be the disadvantage of having a high density of concrete?

Its disadvantages are as follows: As the sections of the structure are heavy, they need more space. Thus the use of concrete as shielding against radiation needs more space. 2. The weight of shielding concrete is very high in the range of 3360 to 3840 kg/m3.