Application Of Technology For Grinding High Titanium Granulated Blast Furnace Slag In High Performance Concrete

There is about 24 percent TiOz in the BFS of Panzhihua, which greatly limits its application to cement based materials and has become vital essence to the production of Panzhihua iron and steel corporation. This paper systematically researched the characteristic of grinding the high-Ti BFS and its application in High Performance Concrete (HPC), which aims to develop the new area of the high-Ti BFS.In the water-tempered BFS, the high TiO2 content has reduced the index latent hydraulic property from 108 percent in low-Ti granulated BFS to 80.4 percent. At the same time, the study also found the grinding efficiency is lower obviously and the fines and particle distribution are greatly different when compare to the low Ti BFS.Similar to the ordinary BFS powder, high-Ti BFS has the same effect with the compatibility among the powder cement and super-plasticizer. The study shows that the flow ability has been greatly improved and its loss has been reduced, while the time of paste hardening has been delayed by adding the high-Ti BFS powder. When the amount of cement is equal, the main reason affect the compatibility of the system is the kinds of superplasticizer and its amount. When 20 percent cement is replaced by finely ground Ti BFS in equal quantity, the HPC which initial flow ability can be improved greatly and its loss has been down. After 120min, the slump is 190mm, the spreading is 415mm, and the issue time is 15 seconds, which is absolutely applied to the pumping concrete.The result of experiment states HPC which initial slump is more than 230mm, after 120min is still above 190mm; The 7d and 28d hydration, the compression strength of concrete is more than VOMpa and 90Mpa can be made from the ground high-Ti BFS instead of 10-30 percent of equal P.O.525R, with the aid of superplasticizer and additive on the water cement ratio is 0.26. By systematical valuation from the workability and strength, it is demonstrated that the HPC is top while added 20percent ground high-Ti BFS and additive. This paper also states initially that the powder influence upon the workability of freshconcrete and mechanical property of hardening concrete. The powder reaction and the composite and condone reaction are thought to be the main reasons to get the high property. By mathematically analyses ratio-strength of concrete that ground high-Ti BFS contribute to the strength of concrete are varied with amount of powder in HPC. The more amount of powder is above 20 percent, the compression strength reduce gradually.The high-Ti BFS reduces the linear contraction of HPC. When the amount of powder is same, the finer the powder, the less the ratio of linear contraction; At the same hydration, different fines of particle results in the different linear contraction regulation. In initial hydration, the ratio grows with the fines; the less fines the fewer ratios. After that linear contraction of HPC gradually gets to the balance.