Comparing with ordinary concrete, silica fume concrete has high strength and durability. But because of its water-cement ratio, cement content and bleeding difficultly, thus it is much easier to have plastic shrinkage than ordinary concrete. The early drying shrinkage and volume deformation is also greater than ordinary concrete. These intertwined factors result in early cracking technical problems in silica fume concrete construction.

Means to reduce the burden of the thermostat temperature to rise, you can reduce the risk of cracks in silicon powder concrete. A high-performance AE water reducing agent and fly ash, silica fume as well as concrete, to meet the requirements of the project for construction of the pump site, it is a good workability and mobility.

Only under certain conditions, water cement ratio, silica fume, fly ash, as well as to maximize low heat of hydration of cement, the silica fume concrete and fly ash concrete with an initial strength as soon as possible using the slow The strength of the drawbacks of growth that may not be able to overcome the strong. Wear resistance and anti-cavitation in large-sized solid overall performance is relatively good.

Silica fume concrete water consumption is more sensitive, specific water consumption increasing silica fume content, the amount of cement to increase significantly with the increase. In order for a boron powder pump, water temperature control technology requirements for low ratio cement, adding high-performance AE water, silica fume content to some extent, to compensate for the reducing agent is required to meet a specific performance was increased, the optimal dose, the relative amount of additives can improve the performance of silica fume concrete to be very low.

Low proportion of silica, water - fume high-strength compound with cement path - has been put AE water reducing agent and a number of projects to meet the simple water test performed by the recession, more concrete so as to High-performance AE water reducing agent, the maximum mixing pump, the structure of the technical requirements for using less water, and high early strength.cracks to prevent the need to reduce.

Combination of superplasticizer, 3 equivalent cement factor of silica fume and the mixture of silica fume and fly ash can not only overcome the low intensity of single fly ash  manganese powder concrete at early age and strength growing slowly at late stage, but also can make concrete has the performances of high-strength, abrasion resistant, anti-cavitation. The concrete has good workability and mobility. It can reduce the amount of cement concrete units, thereby reducing the temperature control burden. Its technical and economic effects are significant

Source:http://www.mhcmp.com