It is a light weight concrete produced by introducing large voids in the concrete or mortar. Its density varies from 3 kN/m3 to 8 kN/m3 whereas plain concrete density is 24 kN/m3. It is also known as aerated,foamed or gas concrete.Properties of cellular concrete: It has the following properties: 1. It has low weight. 2. It has good fire resistance. 3. It…
Plain concrete possesses deficiencies like low tensile strength, limited ductility and low resistance to cracking. The cracks develop even before loading. After loading micro cracks widen and propagate, exposing concrete to atmospheric actions. If closely spaced and uniformly dispered fibres are provided while mixing concrete, cracks are arrested and static and dynamic properties are improved. Fibre reinforced…
It is the combination of reinforcement, brick and concrete. It is well known fact that concrete is very weak in tension. Hence in the slabs, lintels and beams the concrete in the portion below the neutral axis do not participate in resisting the load. It acts as a filler material only. Hence to achieve economy…
Concrete is good in resisting compression but is very weak in resisting tension. Hence reinforcement is provided in the concrete wherever tensile stress is expected. The best reinforcement is steel, since tensile strength of steel is quite high and the bond between steel and concrete is good. As the elastic modulus of steel is high,…
The following are some of the important tests conducted on concrete: 1. Slump test. 2. Compaction factor test. 3. Crushing strength test. 1. Slump Test: This test is conducted to determine the workability of concrete. It needs a slump cone for test Slump cone is a vessel in the shape of a frustum of a cone with…
Concrete has completely different properties when it is the plastic stage and when hardened. Concrete in the plastic stage is also known as green concrete. The properties of green concrete include: 1. Workability 2. Segregation 3. Bleeding 4. Harshness. The properties of hardened concrete are: 1. Strength 2. Resistance to wear 3. Dimensional changes 4….
Plain concrete, commonly known as concrete, is an intimate mixture of binding material, fine aggregate, coarse aggregate and water. This can be easily moulded to desired shape and size before it looses plasticity and hardens. Plain concrete is strong in compression but very weak in tension. The tensile property is introduced in concrete by inducting different materials…
Lacquer is a colored coating that is frequently used to produce a shiny wood appearance. Lacquer types are nitrocellulose, and less often cellulose, which is expensive and produces an appearance that is not very attractive. Lacquer will be durable if suitable measures are implemented. Basics Of Lacquer In a broad sense, lacquer implies a colored and a clear varnish that is…
It is present on the surface of earth crust in most of the rooks and clay. But to produce the metal bauxite (Al2O3. 2H2O) is ideally suited ore. Properties of Aluminium 1. It is having silver colour and bright lustre. 2. It is very light in weight. 3. It is good conductor of electricity. 4….