Experimental study on creep and shrinkage of high-performance ultra-lightweight cement composite of 60 MPa

Chia, Kok-Seng, Liu, Xuemei, Liew , Jat-Yuen Richard , & Zhang, Min-Hong (2014) Experimental study on creep and shrinkage of high-performance ultra-lightweight cement composite of 60 MPa. Structural Engineering and Mechanics, 50(5), pp. 635-652.

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Abstract

Creep and shrinkage behaviour of an ultra lightweight cement composite (ULCC) up to 450 days was evaluated in comparison with those of a normal weight aggregate concrete (NWAC) and a lightweight aggregate concrete (LWAC) with similar 28-day compressive strength. The ULCC is characterized by low density < 1500 kg/m3 and high compressive strength about 60 MPa. Autogenous shrinkage increased rapidly in the ULCC at early-age and almost 95% occurred prior to the start of creep test at 28 days. Hence, majority of shrinkage of the ULCC during creep test was drying shrinkage. Total shrinkage of the ULCC during the 450-day creep test was the lowest compared to the NWAC and LWAC. However, corresponding total creep in the ULCC was the highest with high proportion attributed to basic creep (≥ ~90%) and limited drying creep. The high creep of the ULCC is likely due to its low elastic modulus. Specific creep of the ULCC was similar to that of the NWAC, but more than 80% higher than the LWAC. Creep coefficient of the ULCC was about 47% lower than that of the NWAC but about 18% higher than that of the LWAC. Among five creep models evaluated which tend to over-estimate the creep coefficient of the ULCC, EC2 model gives acceptable prediction within +25% deviations. The EC2 model may be used as a first approximate for the creep of ULCC in the designs of steel-concrete composites or sandwich structures in the absence of other relevant creep data.

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ID Code: 72158
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: cement composite, concrete, creep coefficient, model, shrinkage, ultra lightweight
DOI: 10.12989/sem.2014.50.5.635
ISSN: 1225-4568
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Techno-Press, Ltd
Deposited On: 27 May 2014 23:59
Last Modified: 30 May 2014 09:00

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