Technical and Marketing Manager Interview Questions and Answers

IST of aggregate is the time taken for the concrete mixture to set and harden.

• IST stands for Initial Setting Time.

• It is the time taken for the concrete mixture to set and harden.

• The IST of aggregate is generally considered to be around 1 hour or 60 minutes.

• IST of OPC cement is 30 minutes.

• Transit mixer vehicles are used to transport the concrete mixture from the batching plant to the construction site.

Ductility is the ability of a material to deform under tensile stress without breaking.

• Ductility is a property of metals and alloys.

• It is measured by the amount of deformation a material can undergo before it fractures.

• Ductile materials are used in construction, such as steel and aluminum.

• Ductility is important in manufacturing processes like forging and rolling.

• It is the opposite of brittleness, which is the tendency of a material to fracture under stress.

The name of the slum cone test apparatus is frustum cone. The size of the inverted slum is bottom=200mm, height=300mm, top=100mm.

• The frustum cone is used to determine the workability of concrete.

• It is also known as the Abrams cone.

• The inverted slum is measured by filling the cone with concrete and lifting it up to see how much the concrete slumps.

• The frustum cone is commonly used in construction and civil engineering.

• The size of the cone can vary depending on the specific tes...read more

M20 ratio is a mix design ratio used for concrete construction, consisting of 1 part cement, 1.5 parts sand, and 3 parts aggregate.

• M20 ratio is commonly used for moderate strength concrete construction.

• The ratio is expressed in terms of volume, not weight.

• The strength of the concrete depends on the quality of materials used and the water-cement ratio.

• Other common mix design ratios include M15, M25, and M30.

• M20 ratio is suitable for constructing foundations, columns, and beams...read more