Relationship of macro cracks and microstructure of RPC component
1.Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China; 2.Guangdong Fourth Construction Engineering Corporation, Guangzhou, Guangdong 510100, China
Abstract：To investigate the internal structure of reactive powder concrete (RPC), the static load tests of three RPC beams were conducted at different temperatures to observe the cracks. The microstructures of RPC were determined by scanning electron microscopy (SEM). The results show that under the same load, RPC component has good internal structure at high curing temperature with smaller crack widths than those at normal maintenance temperature. RPC cement hydration products are mainly CSH gel with some Ca(OH)2, and no ettringite or other hydration product is found. There is no coarse aggregate in RPC without transition region interface among particles, and the crack resistance is good. The internal defects of RPC are partly filled by steel fiber to reduce microcracks and improve RPC interface strength.
2014, Vol. 35 
