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Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio

This project describes a research study on the effect of aspects ratio in concrete at different levels of compressive stress on the measured of ultrasonic pulse velocity (UPV) values. Concrete prisms with grade 25 and 30 with different height/width ratio were used and tests were carried out at 28 da...

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Main Author: Chai, Peng How.
Format: Final Year Project Report
Language:English
English
Published: Universiti Malaysia Sarawak, (UNIMAS) 2005
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://ir.unimas.my/id/eprint/17693/1/Ultrasonic%20pulse%20velocity%20%28UPV%29%20test%20on%20concrete%20under%20compression.%20%2824%20pages%29.pdf
http://ir.unimas.my/id/eprint/17693/8/Ultrasonic%20pulse%20velocity%20%28UPV%29%20test%20on%20concrete%20under%20compression.%20%28fulltext%29.pdf
http://ir.unimas.my/id/eprint/17693/
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spelling my.unimas.ir.176932023-02-13T08:26:46Z http://ir.unimas.my/id/eprint/17693/ Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio Chai, Peng How. TA Engineering (General). Civil engineering (General) This project describes a research study on the effect of aspects ratio in concrete at different levels of compressive stress on the measured of ultrasonic pulse velocity (UPV) values. Concrete prisms with grade 25 and 30 with different height/width ratio were used and tests were carried out at 28 days. The test results for concrete prisms of grade 25 and 30 showed similar trends. However, the changes of UPV values in concrete prisms of grade 30 are more significant than concrete prisms of grade 25 . It was also found that the compressive stress in concrete have more significant effect of the measured UPV values on concrete prisms with aspect ratio of 1: 1, which is the smallest height/width ratio. In general, the UPV values increased in concrete prisms at stress-strength ratio ranging from 0 to 0.25. After which, the measured UPV values reduced significantly under a higher compressive stress of up to 0.5 stress-strength ratio. When subjected to compressive stress which corresponds to a stress-strength ratio of 0.25, the UPV values increased by about 4.7% to 5.7% for concrete prisms with aspect ratio 1: 1 of grades 25 and 30 respectively. After which, the measured UPV values reduced significantly under a higher compressive stress of up to 0.5 stress-strength ratio, with a reduction of about 6.9% to 7.3% for concrete prisms with aspect ratio 1: 1 of grades 25 and 30 respectively at the age of 28 days. These results show that compressive stress in concrete has significant effect on the measured UPV values. This implies that the state of stress in concrete has to be determined first when UPV is used for the estimation of in-situ concrete strength. Otherwise, if in-situ UPV values are used to estimate the in-situ concrete strength by using the correlated results based on stress free concrete in the laboratory, the in-situ concrete strength may be underestimated, in particular ifthe state of stress is more than 0.25 stress-strength ratio. Universiti Malaysia Sarawak, (UNIMAS) 2005 Final Year Project Report NonPeerReviewed text en http://ir.unimas.my/id/eprint/17693/1/Ultrasonic%20pulse%20velocity%20%28UPV%29%20test%20on%20concrete%20under%20compression.%20%2824%20pages%29.pdf text en http://ir.unimas.my/id/eprint/17693/8/Ultrasonic%20pulse%20velocity%20%28UPV%29%20test%20on%20concrete%20under%20compression.%20%28fulltext%29.pdf Chai, Peng How. (2005) Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio. [Final Year Project Report] (Unpublished)
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Chai, Peng How.
Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio
description This project describes a research study on the effect of aspects ratio in concrete at different levels of compressive stress on the measured of ultrasonic pulse velocity (UPV) values. Concrete prisms with grade 25 and 30 with different height/width ratio were used and tests were carried out at 28 days. The test results for concrete prisms of grade 25 and 30 showed similar trends. However, the changes of UPV values in concrete prisms of grade 30 are more significant than concrete prisms of grade 25 . It was also found that the compressive stress in concrete have more significant effect of the measured UPV values on concrete prisms with aspect ratio of 1: 1, which is the smallest height/width ratio. In general, the UPV values increased in concrete prisms at stress-strength ratio ranging from 0 to 0.25. After which, the measured UPV values reduced significantly under a higher compressive stress of up to 0.5 stress-strength ratio. When subjected to compressive stress which corresponds to a stress-strength ratio of 0.25, the UPV values increased by about 4.7% to 5.7% for concrete prisms with aspect ratio 1: 1 of grades 25 and 30 respectively. After which, the measured UPV values reduced significantly under a higher compressive stress of up to 0.5 stress-strength ratio, with a reduction of about 6.9% to 7.3% for concrete prisms with aspect ratio 1: 1 of grades 25 and 30 respectively at the age of 28 days. These results show that compressive stress in concrete has significant effect on the measured UPV values. This implies that the state of stress in concrete has to be determined first when UPV is used for the estimation of in-situ concrete strength. Otherwise, if in-situ UPV values are used to estimate the in-situ concrete strength by using the correlated results based on stress free concrete in the laboratory, the in-situ concrete strength may be underestimated, in particular ifthe state of stress is more than 0.25 stress-strength ratio.
format Final Year Project Report
author Chai, Peng How.
author_facet Chai, Peng How.
author_sort Chai, Peng How.
title Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio
title_short Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio
title_full Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio
title_fullStr Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio
title_full_unstemmed Ultrasonic pulse velocity (UPV) test on concrete under compression : a study on effect of aspect ratio
title_sort ultrasonic pulse velocity (upv) test on concrete under compression : a study on effect of aspect ratio
publisher Universiti Malaysia Sarawak, (UNIMAS)
publishDate 2005
url http://ir.unimas.my/id/eprint/17693/1/Ultrasonic%20pulse%20velocity%20%28UPV%29%20test%20on%20concrete%20under%20compression.%20%2824%20pages%29.pdf
http://ir.unimas.my/id/eprint/17693/8/Ultrasonic%20pulse%20velocity%20%28UPV%29%20test%20on%20concrete%20under%20compression.%20%28fulltext%29.pdf
http://ir.unimas.my/id/eprint/17693/
_version_ 1758582503220707328
score 13.211869

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