Seite - 1176 - in Book of Full Papers - Symposium Hydro Engineering

COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- SELF-PROTECTED UNDERWATER CONCRETE IN REHABILITATION OF HYDRAULIC STRUCTURES Feng JIN Professor in Department of Hydraulic Engineering, Tsinghua University，Beijing, CHINA Hu ZHOU Engineer in Department of Hydraulic Engineering, Tsinghua University，Beijing, CHINA Fengliang LI Vice President in Sinoconfix Company，Beijing, CHINA Peng WAN Engineer in Sinoconfix Company，Beijing, CHINA 1. INTRODUCTION In rehabilitation of hydraulic structures, there are many chances to meet the need of concrete pouring into the water body. The study of underwater concrete technology has been conducted since the early age of concrete development. Some underwater concrete technologies have been developed, i.e. bucket, grouted-intruded aggregate, grouting and tremie[1]. These construction methods were the efforts the engineers ever made to reduce the serious segregation and loss of cement caused by the scouring of concrete during construction and hardening process, so as to avoid the deterioration of concrete quality and affect the water environment. In the late 1970s, a new type underwater concrete, named 1176