论文信息 - EXTENT OF HEALING OF CRACKED NORMAL STRENGTH CONCRETE. TECHNICAL NOTE

EXTENT OF HEALING OF CRACKED NORMAL STRENGTH CONCRETE. TECHNICAL NOTE

The goal of this research is to investigate the extent of healing of cracked concrete. A feedback-controlled test was used to generate a crack with a controlled width in concrete specimens. Water permeability was evaluated by a low-pressure water permeability test (WPT). Elastic wave signal transmission measurements were performed immediately after cracking and repeated after 100 days of WPT. Immediately after cracking, water permeability increased and the signal transmission decreased with increasing initial crack width. The water permeability of cracked specimens decreased significantly, whereas the signal transmission increased with time. Both permeability and transmission measurements suggest autogenous healing of the cracks. However, the recovery in signal transmission with crack healing is not as spectacular as changes in permeability, inferring only partial mechanical healing of the cracks.

[1] Jan Drewes Achenbach,et al. Surface wave attenuation measurement for application to pavement characterization , 1998, Smart Structures.

[2] Surendra P. Shah,et al. Permeability study of cracked concrete , 1997 .

[3] N. Hearn. Saturated permeability of concrete as influenced by cracking and self-sealing , 1993 .

[4] Ravindra Gettu,et al. Testing of concrete under closed-loop control , 1996 .

[5] S. Shah,et al. Permeability of cracked concrete , 1999 .

[6] C A Clear,et al. THE EFFECTS OF AUTOGENOUS HEALING UPON THE LEAKAGE OF WATER THROUGH CRACKS IN CONCRETE , 1985 .

[7] R. Haddad,et al. Effect of early overloading of concrete on strength at later ages , 1992 .

[8] Jan Drewes Achenbach,et al. ULTRASONIC INVESTIGATION OF CONCRETE WITH DISTRIBUTED DAMAGE , 1998 .

[9] C. Morley,et al. Self-sealing property of concrete—Experimental evidence , 1997 .