Highly efficient shot-crete composition mixed Metakaolin and Silica Fume

摘要

The present invention relates to a shotcrete composition which is used as a temporary support member for stabilizing an excavation section immediately after excavation of a tunnel / ground space and also as a permanent support material after completion of the tunnel / ground space, and is a fine powder admixture. ) And silica fume in combination with a high performance shotcrete composition considering the mechanical properties such as compressive strength and flexural strength, as well as long-term durability and economic feasibility.;High-performance shotcrete composition of the present invention is a coarse aggregate of 500 ~ 700kgf weight having a maximum dimension of 10 ~ 15mm per 1m ³ shotcrete; Fine aggregate weighing 1,000-1,200 kgf; 300 to 450 kgf weight cement; Water having a water-cement ratio of 40 to 60% by weight; A fastener of 4 to 10% of the weight of the cement; And, 4 to 8% of a blended material of the cement weight. The blended material is characterized by mixing and mixing metakaolin and silica fume.;Metakaolin, Silica Fume, Shotcrete, High Performance, High Strength, Durable