INFLUENCE OF IMPOSED COMPRESSIVE STRESS AND SUBSEQUENT SELF-HEALING ON CAPILLARY ABSORPTION AND CHLORIDE PENETRATION INTO UHPFRCC

Author(s): P. Wang, X. Yao, F.H. Wittmann, P. Zhang and T. Zhao
Book Title: Seventh International RILEM Conference on High Performance Fiber Reinforced Cement Composites (HPFRCC7)
Editor: H.W. Reinhardt, G.J. Parra-Montesinos, H. Garrecht
ISBN: 978-2-35158-145-2
e-ISBN: 978-2-35158-146-9
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 243-250
Total Pages: 8
Language: English

Abstract: Ultra-high performance fibre reinforced cementitious composites may be considered to be durable materials as porosity is comparatively low and strength is high. Service life of reinforced concrete structures in contact with seawater or with water containing dissolved aggressive ions such as chloride and sulphate depends essentially on transport properties. Therefore capillary absorption may be considered as an indication for durability and service life of concrete structures. In most cases capillary absorption is measured on small samples prepared in laboratories. Reinforced concrete structures and structural elements in practice, however, are in most cases load bearing. For this reason the influence of an applied load on capillary absorption and on chloride penetration has to be taken into consideration in realistic service life prediction.

The influence of an applied compressive load on capillary absorption and on chloride penetration was studied experimentally. It was found that with increasing applied compressive load the rate of capillary absorption increases and the amount of penetrating chloride and the penetration depth of chloride increase significantly as well. Loaded specimens were placed in saturated Ca(OH)2 solution for 28 days. Self-healing could be observed. Capillary absorption and the rate of chloride penetration are reduced.

It is suggested that these obvious effects should be considered in service life prediction to make it more realistic in future.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00