Published:2011-04-15 Views:

China Railway YanFeng Chengdu Science and Technology Co. Ltd. is the pathfinder and leader of wet shotcrete technology in China.

In 1993, China Railway YanFeng Chengdu Science and Technology Co. Ltd. successfully developed the first Type TK-961 rotor-piston wet shotcrete machine with fully independent intellectual property rights in China. It has overcome the main technical barriers obstructed the promotion of wet spraying technology in China, and created the conditions for improvement of construction technique of tunnel support in China.

It has undertaken the studies on shotcrete technique since 1995. And it established the professional laboratory of shotcrete in 2005, systematic shotcrete research tests based on the scientific projects have been undertaken. So a professional research body engaged in shotcrete research has been set up. The main achievements are as follows:

Early strength shotcrete technology & High strength shotcrete technology

It has developed a complete set of techniques concerning the shotcrete, including the shotcrete with early strength of 1d reaching 20MPa ~30 MPa and the high-strength shotcrete of C40~C60. 

Environment-friendly low-carbon shotcrete technology

Based on existing technique, 50~100kg cementitious material can be saved for per cubic meter of shotcrete by means of optimized mix design and technology parameters. Thus it realizes energy saving and emission reduction due to cement consumption reducing.

High performance shotcrete technology

Systematic experimental studies have been carried out concerning the impermeability, freeze resistance, corrosion resistance and ion diffusion. The results testified that the electric flux of shotcrete can be controlled within 500~1000 coulomb and the impermeability indicator reaches the technical standard of P40.

High performance shotcrete for single layer lining technology

It takes the experimental study of shotcrete for single layer lining based on high performance shotcrete and techniques of waterproofing structure and fiber material.