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Investigation of causes of deterioration of

buildings in Vijayawada and suggestion ofremedial measures by conducting suitable

laboratory tests

  Submitted by T.Meher Sravani(13!1"#1$%

&nder the guidance of "r 'h.Srinivas

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Introduction

 "efinition of "eterioration :

The process of becoming progressively worse i.e falling from higher

to lower level in quality

)actors 'ausing "eterioration in Structures 

• Due to freeze and thaw action

• Corrosion• Over loading

• eat

• !ightening damage etc.."

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*ow to detect deterioration in a building

#isual inspection

Outer surface can be detected by testing with metal hammer 

The deterioration of embedded steel can be carried by $DT

%ample testing is important part of any inspection

+on "estructive tests ,erformed in site:

-ebound hammer test:

  Conducted to test the condition of cover concrete and to identify the

presence of any delamination

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&veragenumbered-ebound/

0uality of 'oncrete

'() #ery good hard layer  

*) to () +ood layer  

,) to *) -air  

,) /oor Concrete

) Delaminated

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&ltrasonic ,ulse Velocity Test

  To asses the homogeneity andintegrity of concrete a0 the testessentially consists of transmittingultrasonic pulses of 1)21( zfrequency through a concretemedium and receiving at the otherend

 

#elocity Concretequality

'(3m4sec #ery good toe5cellent

*.12( 3m4sec +ood to verygood"slight

porosity maye5ist

*2*.13m4sec %atisfactory butloss of

ingredients issuspected

* 6m4sec /oor and lossof integrity e5ist

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7oth 8pv and 9ebound hammer test

&Test 9esults &;nterpretations

igh 8/# values"igh impact

hammer numbers

$ot corrosion prone

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  9ebound hammer 8/# =quipment

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iterature -eview

21 *iroshi watanabe and hirohisa 4oga 56eneral information on

deterioration of e7isting concrete structures and recentresearch to8ics on the maintenance techni9ues in ,!-I/

 >ccording to research results implementation of preventivemaintenance with diagnosis using non destructive tests is identifiedas one of the cost2effective alternative for concrete structuresdeteriorated by salt attac6

2:;.Mani and ,.Srinivasan 5'orrosion measurements in concretestructures/

 > /eriodical measurement of rate of corrosion ta6ing into accounttemperature and humidity and a statistical analysis of the datameasured over a period of time may yield better and reliable

assessment in predicting service life. ;t also becomes necessary todefine the level of damage more clearly to declare a structureunserviceable

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23;.Sivasubramanian

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2Bee higgins< =ohn ,.)orth< nne +eville

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2#,aolo )oraboschi

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2FSantiago 6u?man

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casting of beams and slabs are done in laboratory

$ow the load carrying capacity of beams and slabs are calculatedwith the help of various instruments available in our laboratory

9etrofitting of these components are done with the help of +lassfibre reinforced polymer and again the load carrying capacity ofthese components can be calculated

$ow by observing the site data and laboratory data comparisonanalysis can be made and suggestion of suitable remedial

measures can be given for the deterioration of buildings

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T>$3 EO8