How would you describe the soundness of cement?

The soundness of cement refers to the stability of the volume change in the process of setting and hardening. If the volume change is unstable after setting and hardening, the concrete structures will crack, which can affect the quality of buildings or even cause serious accidents, known as poor dimensional stability.

What is compressive strength of brick?

Compressive strength of brick units varied from 4.3 to 6.9 MPa with an average of 5.7 MPa. Average modulus of elasticity was found to be about 3878 MPa., and bricks found to be soft and weak compared to clay bricks.

What are the properties of bricks?

Qualities of a good brick:

• Shape. Good bricks will be consistent in size and conform to the standard BS 3921.
• Well‐burnt.
• Ring.
• Water absorption.
• Compressive strength.
• Strength and density (water absorption).
• Materials.
• Soluble salts.

What is frog in brick?

A frog in a brick is an indentation in the top and about an inch deep at its fullest point and has sloping sides . The idea is it takes mortar and combined with the joint of the two bricks that meet over it in the row above when set, prevent the brick moving in all directions and giving it stability .

What is the importance of bricks?

brick is most abundant and natural material on earth. Bricks have been used for building innumerable structures over many thousands of years because of their durability.

What is soundness of cement and how is it tested?

Soundness of cement may be determined by two methods, namely Le-Chatelier method and autoclave method. In the soundness test a specimen of hardened cement paste is boiled for a fixed time so that any tendency to expand is speeded up and can be detected. Soundness means the ability to resist volume expansion.

What is soundness and unsoundness of cement?

Soundness of cement is the ability of a hardened paste to retain its volume after setting. A cement is said to be unsound (i.e., having lack of soundness) if it is subjected to delayed destructive expansion. Unsoundness of cement is due to presence of excessive amount of hard-burned free lime or magnesia.

Why compressive strength of brick is important?

Compressive strength test on bricks are carried out to determine the load carrying capacity of bricks under compression with the help of compression testing machine. Thus, it is important to know the compressive strength of bricks to check for its suitability for construction.

What is the water absorption of brick?

For first class bricks, should not more than 15 \% For second class bricks, it should not more than 20 \% For third class bricks, it should not more than 25 \%

What are the uses of bricks?

They are widely used as a structural as well as a non-structural(aesthetical) element in construction. When used as a structural member, bricks are used for the construction of walls, retaining walls, arches, claddings etc, and as a non-structural member, they can be used as fillers and for ornamental purpose.

Why do bricks have indentations?

‘Frogging’ – the familiar (usually pyramidal) indentation in bricks – originates from the ancient Egyptian custom of creating hollows in their Nile-clay bricks, in which they interred live animals (usually infant) as building work progressed.