Silica fume for railway bridge UHPC

Silica fume for railway bridge UHPC ,the use of this silica powder for UHPC is usually as an additive in the ultra-high performance concrete used in the construction of railway bridges for cable-stayed bridge anchoring.The matrix compressive strength was reached when the microsilica doping was 15%, after which the overall compressive strength showed a decreasing trend with the increase of silica fume doping. Because the volcanic ash reaction of the silica fume is very weak at room temperature, a large part of the silica fume did not react and could not effectively exert the effect of improving strength. Comparing with the net paste of 52.5 grade silicate cement, the compressive strength at 0.16-0.22 water-cement ratio are between 112-114MPa, which shows that after the doping of silica fume, the compressive strength of the UHPC matrix are improved compared with the net paste. This silica powder has multiple advantages in building applications, including enhanced strength, improved durab…