Hydrothermal low-cycle fatigue of concrete - durability of energy storage water tanks

Author(s): M.A. Elrahman, B. Hillemeier
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 822-830
Total Pages: 8
Language: English

Abstract: 
In this paper, experimental investigations were carried out on the behaviour of high performance concrete intended for hot water concrete tanks to store water at a temperature above 100°C. The tested concrete has been subjected to heating-cooling cycles from ambient conditions to a temperature of 200°C and a pressure of 15 bars. The autoclave technique was used to load the concrete specimens with repeated cycles of high pressure and temperature with heating/cooling rates of about 1/0,5 K/min respectively. In mix design, the packing density concept of the aggregates and fines according to the modified Fuller curve have been applied. Normal and fine fly ash and silica fume have been used. The water/cement ratio was regulated in order not to produce capillary pores. CEM III/B was used and the total mass of the cementitious material was 312 kg/m³. Experimental studies involving the measurements of strength, porosity, and permeability will be presented. The results indicated that the incorporation of mineral admixtures can effectively improve the packing density which results in reducing the total porosity of HPC to less than 6%. The air permeability is noticeably reduced and the compressive strength increased from 70 to about 100 MPa during the autoclave cycles.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00