Important Technical Terms

Transcription

1 BRICK MASONRY

2 How bricks are forming? (Fig. 1) Bricks are obtained by moulding clay in rectangular block of uniform size and then drying and burning these blocks It does not require dressing. As per the standards, size of the brick is 190mmx 90mm x 90mm. It is also called modular bricks. Average weight of the brick will be about 3 to 3.5kg. Fig.1 BRICKS

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4 Important Technical Terms

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8 Types of Bonds Header bond Stretcher bond English bond Flemish bond Garden wall bond Dutch bond

9 Header bond HEADER BOND: all the bricks are arranged in header courses. The overlap is usually kept equal to half the width of brick. It is achieved by using three quarter brickbats in alternate courses. show the plan of header bond

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11 STRETCHER BOND STRETCHER BOND: all the bricks are arranged in the stretcher courses. It is achieved by using half brickbats in alternate courses. SHOW THE PLAN OF COURSE 1 AND COURSE 2 (EXERCISE)

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13 English bond It is the strongest bond in brick work. The alternate courses consists of stretchers and headers. (show the Plan for this diagram). A queen closer is put in between two headers on alternate courses at the end.

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16 Flemish bond In this type of bond the headers and stretchers are placed alternatively. A queen closer will be placed on the alternate courses at the end joint.

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19 Garden wall bond It is used for the construction of the boundary walls, compound walls, garden walls etc. The wall is one brick wall and its height does not exceed two meters. There are two types of garden wall * English garden-wall bond * Flemish garden-wall bond.

20 Dutch bond This is a modified form of the English bond and here the corner of the wall is strengthened. ¾ bat is placed before the header In every alternate courses.

21 Stone Masonry

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23 Stones of irregular sizes are used The stones obtained from quarry are taken in use in the same form or they are broken and shaped in suitable size by means of hammer as the work proceeds. The strength of stone masonry depends on *the quality of mortar * the use of long through stones at frequent intervals * the proper filling of the mortar between the spaces of stones

24 Course Rubble Masonry Heights of stone varies from 50mm to 200mm Stones will sort out before work starts Work is carried out in courses such that the stones in a particular course are equal height Used in Public Building,Residential Building

25 Coursed Rubble Masonary

26 Uncoursed Rubble Masonry The stones are not dressed The courses are not maintained regularly The larger stones are laid first and the spaces between them are filled up by means of spalls This type of rubble masonry, being cheaper Is used for the construction of godowns, garages, labor quarters

27 Uncoursed Rubble Masonry

28 Random Rubble Masonry Stones of irregular sizes and shapes are used More skill is required to make this masonry structurally stable If the face stones are chisel-dressed and thickness of mortar joint does not exceed 6mm, it is known as Random Rubble Masonry This type is also used in the construction of residential building compound walls, godowns etc.

29 Ashlar Masonry In this type of construction, the square or rectangular blocks of stones are used. The courses are not necessarily same height. The height of the stones varies from 250mm to 300mm The length of stones should not exceed three times the height

30 Ashlar Fine Masonry In this type of ashlar masonry, the beds, sides and faces are finely chisel-dressed The stones are arranged in proper bond and the thickness of the mortar joints does not exceed 3mm This type of construction gives smooth appearance but it is costly in construction

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32 Ashlar Chamfered Masonry In this type of masonry the specification regarding size, bond and joint are similar to ashlar fine masonry. But the stones used are beveled for a depth of 2.5cm with chisel and beveled angel is 45 0 around the face. It is chamfered at an angle 45 degrees by means of chisel for a depth of about 25mm.

33 Ashlar Chamfered Masonry

34 Ashlar Facing Masonry A strip of about 25mm wide made by chisel around the perimeter of every stone exposed for view The remaining portion of the face is left in the same form as received from quarry.

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