Ultra-high performance concrete containing metakaolin and preparation method of ultra-high performance concrete

[0031] An ultra-high-performance concrete prepared with metakaolin powder, the components per cubic meter are as follows: 770kg of cement, 43kg of silica fume, 475kg of metakaolin powder, 1960kg of machine-made sand, 33kg of water reducing agent, and 200kg of water. The specific surface area of ​​metakaolin is not less than 800m 2 / kg, the loss on ignition is not more than 2.5%, and the 28d activity index is not less than 115%. After the materials are ready, the above components are mixed, and after being stirred by a forced mixer for 2.5 minutes, a kind of ultra-high performance concrete prepared with metakaolin powder as described in the present invention can be obtained. The concrete has good workability and no segregation , Bleeding phenomenon. The performance and hardening properties of the concrete mixture are shown in Table 1.

[0033] An ultra-high-performance concrete prepared with metakaolin powder, the components per cubic meter are as follows: 800kg of cement, 46kg of silica fume, 450kg of metakaolin powder, 1900kg of machine-made sand, 35kg of water reducing agent, and 202kg of water. The specific surface area of ​​metakaolin is not less than 800m 2 / kg, the loss on ignition is not more than 2.5%, and the 28d activity index is not less than 115%. After the materials are ready, the above components are mixed, and after being stirred by a forced mixer for 2.5 minutes, a kind of ultra-high performance concrete prepared with metakaolin powder as described in the present invention can be obtained. The concrete has good workability and no segregation , Bleeding phenomenon. The performance and hardening properties of the concrete mixture are shown in Table 1.