Influence of Nano-particles on Durability of Shaft Concrete

To improve the abrasion resistance and dry shrinkage resistance of concrete for shaft lining, nano-particles were used as admixtures in the modification of concrete. The results show that NS and carbon fiber not only improve the compressive strength and flexural strength of concrete, but also improve the wear resistance and dry shrinkage performance of the material. The concrete with double NS and NC content of 3% and 2% has the best impact wear resistance. The impact wear test wear is only 0.64 kg/m2, which is 85% lower than that of the reference group. Compared with common cement, the dry yield of cement mortar mixed with 2% silica powder and 3% carbon fiber is increased by 128%. It is found from the microstructure of concrete before and after modification that the main reasons for the improvement of the abrasion resistance of the filler material of NS powder particles are as follows: the adhesion of NC and the reaction are the main reasons for the improvement of the dry shrinkage performance.