DOUBT SESSION ON QUANTITY SURVEY AND RATE ANALYSIS \ आज मिलेगा आपके सवालो का जवाब  BY CIVIL GURUJI
Channel: Civil Engineers Training Institute
Date: 13/08/2020

0:01:20   Volume of 1 bag of cement
0:05:40      Deduction of plaster
0:14:05      Skirting
0:15:45     Aggregate 10 & 20 mm


DOUBT SESSION ON QUANTITY SURVEY AND RATE ANALYSIS BY CIVIL GURUJI
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In this video you will get to know about:
1.volume of 1 bag of cement
2. plaster deduction
3. skirting depth
4. aggregate for 20mm and 10mm

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These properties of bricks include shape, size, color, and density of a brick.

(i) Shape.
The standard shape of an ideal brick is truly rectangular. It has Well defined and sharp edges. The surface of the bricks is regular and even.

Special purpose bricks may, however, be either cut or manufactured in various other shapes. These are generally modifications of rectangular shapes.

(ii) Size.
The size of brick used in construction varies from country to country and from place to place in the same country
(iii) Color.
The most common color of building bricks falls under the class RED. It may vary from deep red to light red to buff and purple.

Very dark shades of red indicate over burnt bricks whereas yellow color is often indicative of under-burning.

(iv) Density.
The density of bricks or weight per unit volume depends mostly on the type of clay used and the method of brick molding (soft-mud, Stiff-mud, hard-pressed etc.).

In the case of standard bricks, density varies from 1600 kg/cubic meter to 1900 kg/cubic meter.

A single brick (19 x 9 x 9 cm) will weigh between 3.2 to 3.5 kg. depending upon its density.
2) Mechanical Brick Properties.
Under this heading of properties of bricks, compressive strength and flexure strength are included
Plaster, a pasty composition (as of lime or gypsum, water, and sand) that hardens on drying and is used for coating walls, ceilings, and partitions.
Plasterwork is construction or ornamentation done with plaster, such as a layer of plaster on an interior or exterior wall structure, or plaster decorative moldings on ceilings or walls. ... The process of creating plasterwork, called plastering or rendering, has been used in building construction for centuries
Tools and materials include trowels, floats, hammers, screeds, a hawk, scratching tools, utility knives, laths, lath nails, lime, sand, hair, plaster of Paris, a variety of cements, and various ingredients to form color washes.
While most tools have remained unchanged over the centuries, developments in modern materials have led to some changes. Trowels, originally constructed from steel, are now available in a polycarbonate material that allows the application of certain new, acrylic-based materials without staining the finish. Floats, traditionally made of timber (ideally straight-grained, knot-free, yellow pine), are often finished with a layer of sponge or expanded polystyrene.
Methods[edit]
The first coat or rendering is from 1/2 to 3/4 inches thick, and is mixed in the proportions of from one part of cement to two of sand to one part to five of sand. The finishing or setting coat is about 3/16 inches thick, and is worked with a hand float on the surface of the rendering, which must first be well wetted.
External plastering[edit]
Main article: Stucco
Stucco is a term loosely applied to nearly all kinds of external plastering, whether composed of lime or of cement. At the present time it has fallen into disfavor, but in the early part of the 19th century a great deal of this work was done. Cement has largely superseded lime for this work. The principal varieties of stucco are common, rough, trowelled and bastard. .
• Common stucco for external work is usually composed of one part hydraulic lime and three parts sand. The wall should be sufficiently rough to form a key and well wetted to prevent the moisture being absorbed from the plaster.
• Rough stucco is used to imitate stonework. It is worked with a hand float covered with rough felt (a stiff bristled brush can also be used), which forms a sand surface on the plaster. Lines are ruled before the stuff is set to represent the joints of stonework.
• Trowelled stucco, the finishing coat of this work, consists of three parts sand to two parts fine stuff. A very fine smooth surface is produced by means of the hand float.
• Bastard stucco is of similar composition, but less labor is expended on it. It is laid on in two coats with a skimming float, scoured off at once, and then trowelled.
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