Reliability of Non-Destructive Tests for Evaluating Concrete Quality

quartzaardvarkUrban and Civil

Nov 29, 2013 (4 years and 1 month ago)

121 views

I


Reliability of Non
-
Destructive Tests for Evaluating Concrete
Quality

Team Members: Nader Abdulla Al Zarouni , Al Hassan Mohamad, Ahmed Ali Al
Samri, Yaser Yahya Al Nuaimi

Team Advisor:
Dr. Amr Salah El
-
Dieb

Department:
Civil Engineering



Concrete structures are exposed to different deterioration mechanisms such
as chemical,

mechanical, organic, and physical. These deterioration mechanisms affect
integrity, stability and safety of reinforced concrete structures, thus it is necessary to
determine the quality of concrete every now and then via reliable tests. For already
existi
ng structures, the process becomes harder as great care should be taken not to impair
the safety of the tested structure while executing the test. From here, it was crucial to use
tests that don’t affect the structure combined with the ability to provide r
eliable data
which lead to the so
-
called “Non
-
Destructive Tests”. The Non
-
Destructive Tests (NDTs)
are set of tests that aim to measure the concrete quality of already existing structures
without affecting its safety or cause any damage to it. The set of t
ests includes but not
limited to Surface Hardness Test, Ultrasonic Pulse Velocity (UPV), Cores, and Cover
Meter Test. Surface Hardness Test is used to determine rebound number which depends
on the concrete surface hardness. Rebound number is one of many fa
ctors related to the
quality of concrete (strength). The UPV is another NDT test relays on the fact that
velocity depends primarily upon elastic properties of concrete and almost independent of
geometry. The equipment used in this test is able to generate

pulses, transmitting these
pulses into the concrete, receiving and amplifying the pulses, and measuring and
displaying the time taken which is plugged in specific formulas in order to determine the
concrete quality. Coring is a common NDT method which is
considered to be the most
reliable test to evaluate strength test. In this test, cylindrical core samples are extracted
using a driller with diamond teeth. The extracted cores are then subjected to compression
force for strength estimation. Cover meter is
a NDT that aims to measure concrete cover
in already existing structures. The used equipment contains a coil through which an
electrical current passes generating a magnetic field that propagates through the concrete
and interacts with the reinforcement. T
he interaction is due the physical properties of steel
(magnetic permeability and conductivity). NDT results are affected by several factors
which in turns affects the reliability of the test results and the evaluation of concrete
quality. The main objecti
ve of the project is to apply different NDT methods used in
evaluating the concrete quality and study factors which affect test results. The expected
outcome of the project is to extract equations that combined the NDT results as
parameters to evaluate th
e concrete quality (strength) for unknown concrete samples.

2

ةناسرخلا ةدوج مييقتل ةمادهلا ريغ تارابتخلاا دامتعا


يميعنلا ىيحي رساي , يرمسلا يلع دمحأ , دمحم نسحلا , ينوعرزلا الله دبع ردان :عورشملا بلاط

بيدلا ملاس ورمع :روتكدلا فارشإ تحت

ةسدنهلا :يملعلا مسقلا

ةيندملا

:عورشملا صخلم

ةيوضعلاو ةيكيناكيملاو ةيئايميكلا اهنم ةددعتم تايلآ قيرط نع متت ةفلتخم روهدت لماوعل ةيناسرخلا ينابملا ضرعتت
.ةيئايزيفلاو



تايلآ

روهدتلا



هذه

ُر
ّ
ثؤ
ُ
ت

ىلع



ةملاسلا



رارقتسإو



نامأو

تنمسلإا

حلسملا
،

نمف اذل

ُيرورضلا

رير
ْ
ق
َ
تل



ةيعون



ةناسرخلا

ني
َ
ب



ن

ي

حلا



ر
َ
خلآاو

ءارجإ



تارابتخلإا

ىلع ةظفاحملا ىلع صرحلا ببسب ابوعص رثكأ ةيلمعلا حبصت اقبسم ةدوجوملا ينابملل ,

ةقوثوملا
.ىنبملا ةملاس


ا هذه ىمست ,تقولا سفن يف ةقوثوم جئاتن رفوتو ىنبملا فلتت لا يتلا تارابتخلا ةيمهأ زربت , قبس ام ىلع أءانب
" تارابتخلا
لاا
. "ةمادهلا ريغ تارابتخ

لاا
يغ تارابتخ
لاا نم ةعومجم نع ةرابع ةمادهلا ر
ريثأتلا نودب اقبسم ةدوجوملا ينابملل ةناسرخلا ةدوج سايقل فدهت تارابتخ
يق رابتخاو , ةيتوصلا قوف ضبنلا ةعرس : رصحلا لا لاثملا ليبس ىلع ترابتخلاا هذه لمشت .ينابملا هذه ةملاس ىلع
كمس سا
.ةيدادترلاا سايقم رابتخا ,حطسلا ةبلاص رابتخا ,ةناسرخلا

داعبأ ىلع دامتعلأا نود , ةناسرخلل ةيطاطملا صئاصخلا ىلع دمتعت يتلا ةعرسلا أدبم ىلع لمعت ةيتوصلا قوف ضبنلا ةعرس
لسرت .ةنيعلا

هذه



تاضبنلا

ىلإ


ُ
م
ّ
خض
ُ
تو ملتست،

ةناسرخلا

،
َ
تاضبنلا

ُسي

ق
َ
يو

ُضر
ْ
ع
َ
يو


َ
تقولا

يف قرغتسملا



غيص



ةن
ّ
يعم

يكل


َ
ر
ّ
رق
ُ
ت


َ
ةيعون


َ
ةناسرخلا
.

ةيناسرخلا رصانعلا يف حيلستلا ديدح قوف ةدوجوملا ةناسرخلا كمس ةفرعمل ةعئاشلا تارابتخلا نم ةناسرخلا كمس رابتخا
لاجم ديلوت ةركف ىلع دمتعت رابتخلاا اذهل ةمدختسملا ةادلأا .ينابملا يف ةدوجوملا ةفلتخملا

همادصا دنع دتري يكل يسيطانغم
.ةناسرخلا ءاطغ كمس ددحي مث نمو ,لابقتسلااو لاسرلال قرغتسملا تقولا باسح متيو ,حيلستلا ديدحب

. ةناسرخلا ةدوج مييقتل تارابتخلاا اذه ةيدامتعا ىلع سكعني امم لماوعلا نم ةعومجمب ةمادهلا ريغ تارابتخلاا رثأتت

رشملا اذه نم يساسلأا فدهلا
جئاتن ىلع ةرثؤملا لماوعلا ةساردو ةناسرخلا ةدوج مييقتل ةمادهلا ريغ ترابتخلاا قيبطت وه عو
ريغ تارابتخلال ةفلتخملا بيلاسلاا نيب جمدلل ةلماش ةغيص داجيا يه عورشملا اذه نم ةعقوتملا تاجرخملا .ترابتخلاا هذه
ةوقلا ةفورعم ريغ ةيناسرخ تانيع مييقتل ةمادهلا

وثوم جئاتنب
.ةق