Ultra-high performance grouting material for post-tensioned prestressed duct

The invention belongs to the field of building materials, and particularly relates to an ultrahigh-performance grouting material for a post-tensioned prestressed duct, which is prepared from the following ingredients in parts by weight: 90 to 100 parts of binding materials, 80 to 90 parts of fine sand, 0.7 to 0.8 part of water reducing agents, 0.01 to 0.015 part of antifoaming agents, 0.027 to 0.035 part of plastic expanding agents, 0.09 to 0.12 part of hardening expanding agents, 0.009 to 0.01 part of nano silicon dioxide and 18 to 20 parts of water. The cementing material is prepared from 60 to 70 weight percent of cement, 10 to 20 weight percent of silica fume, 5 to 10 weight percent of quartz powder and 10 to 15 weight percent of microbeads. According to the ultrahigh-performance grouting material for the post-tensioned prestressed duct, the grain composition between the gelling material and the aggregate is reasonably designed, the material activity is combined, and the material synergistic effect betwee