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Creep, shrinkage and elastic modulus data of Malaysian concrete

It has been widely acknowledged that creep and shrinkage of concrete are greatly influenced by the surrounding ambient. In spite of various research carried out to investigate the phenomena, little were conducted on time-dependent deformation for concrete in tropical climate. Locally, most creep and...

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Main Authors:	Omar, Wahid, Makhtar, Ahmad Mahir, Tan, Pui Lai, Omar, Roslina, Ng, Ming Kwong
Format:	Monograph
Language:	English
Published:	Faculty of Civil Engineering 2008
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/6691/1/73300.pdf http://eprints.utm.my/id/eprint/6691/ http://www.penerbit.utm.my
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spelling	my.utm.66912017-09-06T08:22:49Z http://eprints.utm.my/id/eprint/6691/ Creep, shrinkage and elastic modulus data of Malaysian concrete Omar, Wahid Makhtar, Ahmad Mahir Tan, Pui Lai Omar, Roslina Ng, Ming Kwong TA Engineering (General). Civil engineering (General) It has been widely acknowledged that creep and shrinkage of concrete are greatly influenced by the surrounding ambient. In spite of various research carried out to investigate the phenomena, little were conducted on time-dependent deformation for concrete in tropical climate. Locally, most creep and shrinkage predictions are obtained by referring to foreign design codes developed in temperate climate countries, risking inaccurate predictions. Therefore this research is dedicated to determine the magnitude of time-dependent deformation of concrete in the tropical climate. The objectives are to systematically collect creep and shrinkage data under the influence of tropical climate and to empirically develop a set of modification factors based on the best prediction model. Time-dependent deformation tests were carried out on standard specimens and on reinforced concrete columns and prestressed concrete beams under laboratory-controlled environment with temperature and relative humidity (RH) of 27Â±2oC and 50Â±4% respectively, and natural tropical ambient. On site monitoring of pre-camber of post-tensioned prestressed beams was also carried out. The experimental data were assessed against various existing creep and shrinkage models such as Eurocode 2, ACI 209, B3 Model, CEB-FIP 1990, and Australian Standard 3600 in order to determine the best prediction for tropical concrete. The results show that time-dependent deformation of HSC in the tropical climate is significantly lower than most of the prediction by foreign standard codes. Based on statistical analysis, Eurocode 2 is identified as the best model for tropical concrete and thus chosen as reference model for development of modification factors. Through empirical analysis, modification factors named as TROPCS which stands for â€˜Tropical Creep and Shrinkageâ€™ is introduced. Statistically, the prediction with adoption of TROPCS to Eurocode 2 model results in better accuracy. The coefficient of variation for prediction with TROPCS is at an average of 10.0% for creep and at 21.1% for shrinkage. Validations on the accuracy of TROPCS on structural members were conducted through the results of structural deformation. The results prove that the prediction with TROPCS factors is better than the prediction by EC 2 with the average coefficient of variation for TROPCS predictions on structural members at 12.5%, as compared to the coefficient of variation by EC 2 at 14.8%. The TROPCS modification factors are proposed to be included in the National Annex of Malaysian version of Eurocode 2 as an optional reference. Faculty of Civil Engineering 2008 Monograph NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/6691/1/73300.pdf Omar, Wahid and Makhtar, Ahmad Mahir and Tan, Pui Lai and Omar, Roslina and Ng, Ming Kwong (2008) Creep, shrinkage and elastic modulus data of Malaysian concrete. Project Report. Faculty of Civil Engineering, Skudai, Johor. (Unpublished) http://www.penerbit.utm.my
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
language	English
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Omar, Wahid Makhtar, Ahmad Mahir Tan, Pui Lai Omar, Roslina Ng, Ming Kwong Creep, shrinkage and elastic modulus data of Malaysian concrete
description	It has been widely acknowledged that creep and shrinkage of concrete are greatly influenced by the surrounding ambient. In spite of various research carried out to investigate the phenomena, little were conducted on time-dependent deformation for concrete in tropical climate. Locally, most creep and shrinkage predictions are obtained by referring to foreign design codes developed in temperate climate countries, risking inaccurate predictions. Therefore this research is dedicated to determine the magnitude of time-dependent deformation of concrete in the tropical climate. The objectives are to systematically collect creep and shrinkage data under the influence of tropical climate and to empirically develop a set of modification factors based on the best prediction model. Time-dependent deformation tests were carried out on standard specimens and on reinforced concrete columns and prestressed concrete beams under laboratory-controlled environment with temperature and relative humidity (RH) of 27Â±2oC and 50Â±4% respectively, and natural tropical ambient. On site monitoring of pre-camber of post-tensioned prestressed beams was also carried out. The experimental data were assessed against various existing creep and shrinkage models such as Eurocode 2, ACI 209, B3 Model, CEB-FIP 1990, and Australian Standard 3600 in order to determine the best prediction for tropical concrete. The results show that time-dependent deformation of HSC in the tropical climate is significantly lower than most of the prediction by foreign standard codes. Based on statistical analysis, Eurocode 2 is identified as the best model for tropical concrete and thus chosen as reference model for development of modification factors. Through empirical analysis, modification factors named as TROPCS which stands for â€˜Tropical Creep and Shrinkageâ€™ is introduced. Statistically, the prediction with adoption of TROPCS to Eurocode 2 model results in better accuracy. The coefficient of variation for prediction with TROPCS is at an average of 10.0% for creep and at 21.1% for shrinkage. Validations on the accuracy of TROPCS on structural members were conducted through the results of structural deformation. The results prove that the prediction with TROPCS factors is better than the prediction by EC 2 with the average coefficient of variation for TROPCS predictions on structural members at 12.5%, as compared to the coefficient of variation by EC 2 at 14.8%. The TROPCS modification factors are proposed to be included in the National Annex of Malaysian version of Eurocode 2 as an optional reference.
format	Monograph
author	Omar, Wahid Makhtar, Ahmad Mahir Tan, Pui Lai Omar, Roslina Ng, Ming Kwong
author_facet	Omar, Wahid Makhtar, Ahmad Mahir Tan, Pui Lai Omar, Roslina Ng, Ming Kwong
author_sort	Omar, Wahid
title	Creep, shrinkage and elastic modulus data of Malaysian concrete
title_short	Creep, shrinkage and elastic modulus data of Malaysian concrete
title_full	Creep, shrinkage and elastic modulus data of Malaysian concrete
title_fullStr	Creep, shrinkage and elastic modulus data of Malaysian concrete
title_full_unstemmed	Creep, shrinkage and elastic modulus data of Malaysian concrete
title_sort	creep, shrinkage and elastic modulus data of malaysian concrete
publisher	Faculty of Civil Engineering
publishDate	2008
url	http://eprints.utm.my/id/eprint/6691/1/73300.pdf http://eprints.utm.my/id/eprint/6691/ http://www.penerbit.utm.my
_version_	1643644619206950912
score	13.211869

Creep, shrinkage and elastic modulus data of Malaysian concrete

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