7/25/2019 Discoloration of Stone massonary

1/12

1

Rajarambapu Institute of Technology,

Rajaramnagar

DEPARTMENT OF CIVIL ENGINEERING

Seminar on

Masonry Structure Discoloration and Weaening!

Project by,

"M#$R M%&'%RD(#$R)*++--.

Uner t!e G"iance o#

/rof0 / D #umbhar

7/25/2019 Discoloration of Stone massonary

2/12

I&TR"D%1TI"&

Ma$onry $tr"ct"re% Ma$onry i$ an a$$emb&y o# bric'$( b&oc'$

or $tone !e& to)et!er *it! mortar+Common&y "$e #or t!e

*a&&$ o# b"i&in)$( retainin) *a&&$ an mon"ment$+Famo"$

$tr"ct"re o# $tonema$onry inc&"e Taj Ma!a&( E)y,tianPyrami$ an Stone!en)e+

T!e common materia&$ o# ma$onry con$tr"ction are %-

.ric'

Stone

Concrete b&oc'$

2

7/25/2019 Discoloration of Stone massonary

3/12

Weaening of stone

T!e con$tr"ction o# $tone$ bone to)et!er *it! mortar

i$ terme a$ $tone ma$onry+ Stone ma$onry i$ )enera&&y "$e

in con$tr"ction o# retainin) *a&&$( oc'$( b"i&in)$( etc

Common ca"$e$ o# *ea'enin) o# $tone$ are/0eat!erin) o# $tone

D"e to ,oro"$ nat"re o# $tone

i)! coe##icient$ o# e2,an$ion an contraction "e to &ar)etem,erat"re 3ariation$

U$e o# ba 4"a&ity mortar

3

7/25/2019 Discoloration of Stone massonary

4/12

Ca"$e o# *ea'enin) o# ma$onry4

7/25/2019 Discoloration of Stone massonary

5/12

0ea'enin) o# ma$onry "e to moi$t"re

an *eat!erin) action 5

7/25/2019 Discoloration of Stone massonary

6/12

Discoloration of Stones

A&& $tone$ are more or &e$$ ,oro"$ in nat"re+

Di$co&oration o# t!e $tone ,ro"ce by a $tainin) a)ent t!at *a$

act"a&&y ab$orbe by t!e $tone+

0ater i$ ma$onry5$ *or$t enemy+ Di$co&oration i$ ca"$e by *ater

,enetration or i$ an inication t!at *ater i$ enterin) b"t

e3a,oratin) in ma$onry+

E2treme *eat!er can ca"$e e)raation an *ea'enin) o# $tone

ma$onry *a&&

6

7/25/2019 Discoloration of Stone massonary

7/12

1auses of discoloration of stones

A+ Enterin) &i4"i #rom to, $"r#ace+

.+ Ri$in) moi$t"re #rom minera&$ containe in t!e nat"ra&

$tone

C+ Contamination carrie ", #rom t!e mortar be

D+ Moi$t"re #rom t!e )ro"tin) com,o"n *!ic! i$co&or$

$tone e)e$

7

7/25/2019 Discoloration of Stone massonary

8/12

8

F+ Iron com,o"n$ are #o"n nat"ra&&y in $tone *!ic! can

o2ii6e an ca"$e t!e $tone to t"rn ye&&o*i$! bro*n+

E+ Ca&ci"m !yro2ie in t!e mortar be react$ an become$

ca&ci"m carbonate *!ic! ca"$e$ )rey co&or #ormation+

7/25/2019 Discoloration of Stone massonary

9/12

9

Formation o# ca&ci"m carbonate *!ic! ca"$e$ )rey co&or o#

$tone

7/25/2019 Discoloration of Stone massonary

10/12

Iron com,o"n$ o2ii6e an ca"$e t!e $tone to t"rn

ye&&o*i$! bro*n+10

7/25/2019 Discoloration of Stone massonary

11/12

11

Enterin) &i4"i #rom to, $"r#ace ca"$e$ i$co&oration

7/25/2019 Discoloration of Stone massonary

12/12

17