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Brick, Classification of bricks and properties of good bricks.

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  Brick:- Basically brick is a type of block which is used for the construction of wall and other building components. Classification of bricks - The brick can broadly be divided into two categories ·          1. Unburnt brick :         T he unburnt or sun dried bricks are dried  with the help of heat received from sun after the        process of moulding .These bricks can only be used in the construction of temporary and     cheap structure.  Such bricks should not be used at places exposed to heavy rains. ·            ·          2 . Burnt bricks- These are classified in four categories. ·         (i) First class Bricks:-   These bricks are table – moulded and of standard shape and they are burnt in kilns.   The surfaces and edges of ...
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Important points & characteristics of good concrete.

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  The volume of one 50 kg bag of cement is 34.5 litres   About 19 litres (38%) of water is required to hydrate 50 kg cement in sealed container.   The ordinary Portland cement when tested for its compressive strength at 28 days   according to the method describe by the standard specification, yields a minimum compressive strength of 43N/mm2 is called 43 grade  cement . Too fine cement is susceptible to air set and deteriorates earlier.   The setting time of cement can be controlled by varying the quantity of gypsum in cement. Sometime with the addition of water to cement, a premature set occurs within 5 minutes. This is called false set an is due to  the presence of anhydrous gypsum which is formed due to grinding of gypsum with too hot clinker .this is not to be worried .continuous mixing aggregates , cement and water will break the false set without  harming any property of the concrete .  The ability of cement to mainta...
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Preparation of surface for waterproofing work.

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  HOW TO PREPARE SURFACE FOR WATERPROOFING :-     All surface area should be cleaned well to make visible of hair cracks / aggregate texture and opened the all the joints and construction joints.   Cleaning of RCC member should be done by hacking tool, wire brush, wire grinder & air blower etc. Make sure all kind of dust particles, oil & grease should be removed properly  ·          All visible cracks & construction joints should be sealed with cement mortar with additive Conplast  WL after making V groove.             All clean & treated area should test for water tightness by flooding water for minimum 75 mm head for 48 hours.     All wet spots, water leak & honeycomb areas should be mark for treatment. It shall be treated with        injection grouting with Cebex 100 as additive to be added in grout cement slurry @ dosage of ...
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