Civil Engineering Brick & Stone masonry.pptx

Bricks & Stone masonry

1. MASON R Y Brick W ork I n Cemen t Mortar Masonr y m ay be de f ined as the const r uct i on of build i ng bounded tog ether wit h m or t a r . Ma s onry is no r m al ly used for cons t ruction of wa l ls. I t p e r f or m s a v ar i e t y of f unc t io ns , s uc h as Suppor t ing loads Subdiv i ding space Prov i ding the r m al and acous t ic insu l ation A f fording fire and wea t her pro t ec t ion etc .

2. mas on r y mo r t ar

3. Mort a r It is the pas t y m ater i al for m ed by the addi t ion of wa t er m ixtu r e co m posed of f ine aggrega t e (sand) and ce m ent or l i m e. Genera l ly the f ol l owing types of m or t ar are in use: Mu d m ort a r Li m e m or t ar Li m e su r khi m or t ar C e m ent m ort a r and Ce m ent l i m e m or t ar or l i m e- c e m ent - m or t ar

4. T e r ms Us e d in Brick Mas o nry C o urse : A co m ple t e layer of bri c ks la i d on the sa m e cal l ed a cour s e and i t s thi c kn e s s is eq ual to t he thi c kn e s s of one m o r t a r jo i nt. Frog : Depre s sion s prov i ded in the face of the br i ck. Bed: The bot t om su r face of the br i ck whe n it is l aid flat is ca l led bed. Stre tcher: The side su r face of bricks vis i ble in elevat ion when the bri c k is laid f lat is called the st r etcher ( 19 cm x 9 c m ). Head e r : The end face of the brick w hen it is l aid flat is a s header ( 9cm x 9c m )

5. T e r ms Us e d in Brick Mas o nry Bed joint: The horizon t al m ort a r j oints between two succ e ss i ve cour se s are known as bed jo i nts. Perpend : These are the join t s between bric ks ei t her in long i tud i n a l or cross d i rections. Bat: The br i ck whic h is cut acros s i t s widt h is cal l ed as b at Closer: The bri c k w h ich is cut across i t s length is called as clo s e r .

6. Princip l es in Brick Mas o nr y C o nstruction G o od bri c k m asonry shoul d uti l ize bri c ks w h ich are sound, ha r d, wel l burnt, and tough wi t h uniform colou r , shap e and si ze. The br i ck shou l d be co m pac t , ho m ogeneous a nd free from holes, cracks, ai r -bubbles and ston e lu m ps. In t he br i ck work , the bricks shou l d be la id on their beds wi t h the f rogs poin t ing upwards. The br i ck cour se s shoul d be laid t r uly hor i zont al and shou l d have t r uly ve r t i cal, jo i nts. A s far as poss i ble the use of br i c k - bats shou l d be di s courage d .

7. A s far as poss i ble the br i ck wall s shou l d be r ai s ed unifor m ly wit h prop e r bond. Genera l ly the height of b r ick m ason r y cons t ruction in a day shou l d be le s s than l.5 m . In o r der to ensu r e cont i nuous bond between the old and the ne w , the wal ls shou l d be s t opped wit h a. too t hed end. Fin ishe d br i ckwork in l i m e m or t ar shoul d be cu r ed for a pe r iod of 2 to 3 w eeks. T his per i od can be reduced to 1 to 2 w eeks in case of brickwork w i t h ce m ent m or t a r . In o r der to ca r ry out the brickwork at higher level sing l e sca f folding is u s ed.

8. Bonds in Brick Mas o nry B o nding is a process of ar r ange m ent of bri c ks and m ort a rs to t i e them toge t her in a m ass of b r ickwor k. It shou l d have a m in i m um of v er t ical jo i nts in any pa r t of t he work . It is a wea k por t ion of b r ickwor k and sh o u l d n ot be continuous in two successiv e courses. A wal l having co nt inuous ve r t i c al joints sh a ll a ct as indep e ndent colu m n . Henc e load on wall sha l l not be unifor m ly d ist r ibu t e d. A m ore st r ong and dur able br i ck m ason r y cons t ruction will not have cont i nuous ve r t i cal jo i nts. It sha l l dis t r i bute load on a wide r are a and thereb y m in i m ise the tend e ncy to s e t t le.

9. v a rious types of bon d s a r e:  St r etc her bond  Heade r bond  Engli s h bond  Fle m ish bond