Prediction of compressive strength of concrete through using ultrasonic pulse velocity
Journal Name:
- Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi
Keywords (Original Language):
| Author Name | University of Author | Faculty of Author |
|---|---|---|
Abstract (2. Language):
Since seismicity is active in Turkey, most of the
buildings are vulnerable against earthquake
excitation. So, inspections of buildings are vital.
Concrete is one of the most important parameter
effect the performance of the building. Obtaining
concrete strength is also one of most challenge in
inspection of the building. Classical technique,
which require taking a piece of concrete for
mechanical testing causes more labor, time and
costs. So a simple method required especially in
case of quick inspection of the building.
Ultrasonic pulse velocity is one of the well-known
techniques for nun destructive evaluation of
concrete. The technique is easy, fast and require less
labor. However it is not reliably by itself. In order to
increase reliability, match curve must be prepared
for every different concrete type. So, this study
intended to developed models for concrete used in
Diyarbakir district.
This study both includes experimental and empirical
work. In the experimental part, twelve cube
specimens were produced from concrete work of
different stories of a building being retrofitted in
Diyarbakir. Dimension of cubes are 150 mm and all
the cubes were cured 28 days in water. All the
specimen was tested after at least 28 days.
Ultrasonic pulse velocity (UPV) tests were carried
out at first. For each specimen UPV tests were
carried out at five different points and UPV values
for each specimen was evaluated as average of these
five values. After UPV tests compression tests were
carried out for all specimen. For compression tests,
monotonically axial load was increased until failure
and the maximum load was marked.
After all the UPV and compression tests were
carried obtained data were used for developing a
model to predict compressive strength of concrete
from UPV values. In model, developing regression
analysis was utilized. Data analyzed to obtained
reasonable relation between UPV and compression
strength. As a result, two different equations were
developed (Equation 1 and Equation 2). As seen in
Equations 1-2 only UPV values required to predict
compressive strength of inspected concrete.
f`c=21.77×UPV-53.26 (1)
f`c=22.95×UPV-57.55 (2)
In these equations UPV and f`c values must be in
km/s and MPa units, respectively.
The last part of this study is the performances
evaluation of constructed models. To check
prediction performance of the models a bunch of
data was collected from literature. Our data was not
used in the performance evaluation to make an
objective evaluation. Totally 100 data was collected
from 11 different researches. All the data are of
normal concrete and of cube specimens. To reach a
comment for necessity of our equations, a
comparison was made between our equations and
few equations from literature. Compressive strength
of concrete was predicted for 100 data with our
equations together with equations from literature.
Statistical parameters such as average and relative
error were used in performance evaluation. For the
best model average of predicted and experimental
compressive strength should be nearest one and
relative error should smallest. Statistical evaluation
parameters for all models are given as follow,As can be seen in the table in this table average is
nearest one for Equation 1 and also relative error is
the smallest. So, we can conclude that for the data
grope was used, equation 1 is the best in prediction
of the compressive strength from UPV.
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Abstract (Original Language):
Betonarme binaların dayanımlarının hızlı bir şekilde belirlenmesinde beton dayanımının kolay bir şekilde
tespiti kilit bir öneme sahiptir. Bu çalışmada beton basınç dayanımının pratik, kolay ve yapıya zarar
vermeyecek bir şekilde belirlenmesi hedeflenmiştir. Bu nedenle hasarsız bir yöntem olan ultra ses dalgası
yayılma hızından faydalanılmıştır. Bu çalışma çerçevesinde yapılan deneysel ve istatiksel değerlendirme
çalışmaları neticesinde ultra ses dalgasının beton içindeki yayılma hızı ile beton basınç dayanımı arasında
ampirik bir model geliştirilmiştir.
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