Microstructure of high performance concrete under long term sustained loading

Title: Microstructure of high performance concrete under long term sustained loading
Author(s): C. Lu, C. Chen, G. Shan
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 869 - 874
Total Pages: 6
Nb references: 2
Language: English

Abstract: Microstructure of high performance concrete (HPC) samples under various conditions, including curing for 1 year without loading (HPC-1), sustained loading for 2 years after cured for 3 days (HPC-2), sustained loading for 2 years after cured for 90 days (HPC-3) were studied with the methods of SEM, XRD and MIP. The results of SEM and XRD showed that Ca(OH)2 content at interfacial transition zone (ITZ) of HPC with fly ash decreased. The peak pore size of the specimens under case 2 and case 3 were smaller than that of specimen without loading. Long term sustained loading has serious influence on pore structure of HPC, i.e., the porosity of HPC decreased, volume of smaller pore decreased and volume of macropore increased. The application experience of HPC in a large span pre-stressed cable-stayed bridge of China demonstrated that the good workability of HPC solved the construction problem caused by complex structure of main pylon and high steel density. Higher early strength and Young’s modulus of HPC provided technique support for stretch-draw of pre-stress.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00