Sedimentary rocks (calcareous variety) are found in Madhya Pradesh and Punjab.
Loose gravel has the least bearing capacity when compared to laminated rocks, soft rocks, and compact gravel.
Gneiss exhibits the highest compressive strength when compared to lime stone, laterite and granite.
The number of bricks needed per cubic meter of brick masonry is 500.
Swelling of bricks occurs because of the presence of excess of carbonaceous matter, any gas forming material in the clay and due to bad burning or very rapid firing. This defect in bricks is called Bloating.
In brick masonry, the frog of the brick is normally kept on the top face.
The moisture absorption of a good stone is less than 5%.
Quartzite is a Silicous rock.
The indentation provided in a face of the brick is known as Frog.
When a brick is cut into two halves longitudinally, one part is known as Queen closer.
The percentage of carbon in cast iron is 2 to 4.5%.
The maximum percentage of carbon in wrought iron is 0.15%.
Mild steel has the highest limiting strength as compared to cast iron, aluminium, wrought iron and hard copper.
Galvanizing is done with a thin layer of Zinc.
The percentage of asbestos in asbestos cement sheet is about 15%.
Generally unstratified structure of the stones is obtained from the rocks of the igneous original.
The specific gravity of a dense compact stone is generally between 2.7 to 2.9.
On Moh’s scale a scratch with the aid of a finger nail indicates hardness of 2.
The aggregate which is completely retained on 0.15 mm sieve is called fine aggregate.
The increase in volume of dry sand on addition of water is known as Bulking.
Pointing is the process by which the masonry points are filled up with mortar after raking out for small depth.
The minimum water-cement ratio to obtain workable concrete is 0.4.
Compaction factor for good workability of concrete is 0.95.
Coating the surface of steel by thin layer of zinc is called Galvanizing.
The process whereby wrought iron is manufactured from pig iron is called Pudding.
For melting one tonne of cast iron in a cupola, the quantity of lime stone needed is 20 kg.
Snowcem is a cement paint.
The carbon content in cast iron is about 2 to 4.5%.
Invar is a nickel steel in which nickel content lies between 30-40%.
Araldite is Epoxy resin.
Neoprene is Rubber.
Glazing of clay products is done to improve appearance and protect form corrosive action.
Adding pozzolona to lime helps to reduce the shrinkage, increase resistance to cracking and impart greater strength.
The fracture in asbestos is Fibrous.
Gunpowder can be destroyed by throwing it into water.
Stucco plastering is used for Excellent finish.
Stoneware products are generally hard, compact and impervious to moisture.
Melting point of glass is 7750C to 9500C.
The small areas on painted surface enclosed by hairline cracks are called Crazing.
Lime is considered to be hydraulic lime when it sets under water within 7 to 30 days.
The rate of hydration and hydrolysis of cement depends upon its, Fineness.
