Effect of re-vibration on the compressive strength and surface hardness of concrete

[摘要] This paper reports the results of experimental investigations carried out on the effect of re-vibration on the compressive strength and surface hardness of normal weight concrete. Five different concrete mixes with varying water cement ratio ranging from 0.35 to 0.7 were prepared. The compacted concrete was subjected to re-vibration during the initial setting time period. During the initial setting time, the compacted concrete was re-vibrated at the time of 30 minutes up to 150 minutes of an interval of 30 minutes. The compressive strength and surface hardness of re-vibrated concrete were tested at the age of 35 days. The experimental results showed a significant increment of compressive strength and surface hardness in all re-vibrated concrete. In general, the maximum gain in compressive strength and surface hardness was when the re-vibration occurred at the initial setting time of 2 hours. The average increasing of the compressive strength of concrete by re-vibration is ranging from 3.5% to 21.8%.

[发布机构] Jamilus Research Centre, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Malaysia^1

[效力级别] 土木建筑工程

[关键词] Compressive strength of concrete;Experimental investigations;Initial setting time;Normal weight concrete;Surface hardness;Vibrated concretes;Water-cement ratio