8/19/2019 Ultrasonic Velocity Thesis

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ULTRASONIC VELOCITY THESIS

Why use and what U.V.T?

  Ultrasonic Pulse Velocity (UPV) testing o !on!"ete is #ased on the $u%se

&e%o!ity 'ethod to $"o&ide ino"'ation on the unio"'ity o !on!"ete( !a&ities(

!"a!)s and dee!ts.

 The $u%se &e%o!ity in a 'ate"ia% de$ends on its density and its e%asti! $"o$e"ties

whi!h in tu"n a"e "e%ated to the *ua%ity and the !o'$"essi&e st"ength o the

!on!"ete. It is the"eo"e $ossi#%e to o#tain ino"'ation a#out the $"o$e"ties o 

!o'$onents #y soni! in&estigations.

  When the su"a!e o a se'i+in,nite so%id is e-!ited #y a ti'e &a"ying 'e!hani!a%

o"!e( ene"gy is "adiated "o' the sou"!e as th"ee distin!t ty$es o e%asti! wa&e

$"o$agation. The astest o these wa&es has $a"ti!%e dis$%a!e'ents in the di"e!tion

o t"a&e% o the distu"#an!e and is !a%%ed the longitudinal wave. The !o'$"ession

wa&e &e%o!ity V$ is a un!tion o the dyna'i! Youngs 'odu%us E( the /oissons "atio

L( and the 'ass density ( and is gi&en #y0

When a highe" &e%o!ity is o#tained when !on!"ete *ua%ity is good in te"'s o 

density( unio"'ity( ho'ogeneity et!.

8/19/2019 Ultrasonic Velocity Thesis

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  It is !%ea" "o' the a#o&e e*uation that &e%o!ity is inde$endent o geo'et"y o 

'ate"ia% and de$ends on%y on e%asti! $"o$e"ties o the 'ate"ia% th"ough whi!h it$asses. So #e!ause o that its $ossi#%e to !a%!u%ate du"ing the test the ti'e the

$u%ses ta)e to t"a&e% th"ough !on!"ete with this si'$%e e*uation0

 The"e a"e th"ee way o 'easu"ing $u%se &e%o!ity th"ough !on!"ete 12ig. 34.

a4 The di"e!t 'ethod 1!"oss $"o#ing4 is $"ee""ed whe"e&e" a!!ess to o$$osite sides

o the !o'$onent is $ossi#%e.

#4 The se'i+di"e!t 'ethod is used whene&e" a!!ess to di5e"ent #ut not o$$osite

sides o the !o'$onent is $ossi#%e.

!4 The su"a!e 1indi"e!t4 'ethod is the %east satisa!to"y and shou%d on%y #e usedwhen a!!ess to on%y one su"a!e is $ossi#%e. This 'ethod on%y indi!ates the *ua%ity

o the !on!"ete nea" the su"a!e and is in6uen!ed #y the $"esen!e o "eino"!e'ent

$a"a%%e% to the su"a!e.

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