Creep and shrinkage of ultra lightweight cement composite

Chia, Kok Seng, Liu, Xuemei, Liew, Jat Yuen Richard, & Zhang, Min-Hong (2013) Creep and shrinkage of ultra lightweight cement composite. In 2013 World Congress on Advances in structural engineering and mechanics (2013 ASEM Congress], Techno-Press Journals, International Convention Center-Jeju, Jeju Island, Korea. (In Press)

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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 E-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.

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ID Code: 60906
Item Type: Conference Paper
Refereed: Yes
Keywords: Creep coefficient, Shrinkage, Ultra lightweight cement based composite, concrete
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300)
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Please consult the authors.
Deposited On: 26 Jun 2013 03:30
Last Modified: 19 May 2014 20:56

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