Application Of Silica Fume Concrete In Reservoir Spillway

With the success of high strength silica fume concrete applying in hydraulic outlet repair

, some of Chinese scientific research units begin their study in high-strength silica fume concrete. The results show that the considerable amount of cement mixing into the silica fume makes the concrete compressive strength increases by 1.3 to 2.3 times. The water sand resistant abrasion strength increases by 1.3 to 3.5 times. And the anti-cavitation intensity increases by more than 1.6 times. It indicates that the incorporation of silica fume is not just to improve compressive strength of concrete. The most important thing is that silicon powder can significantly improve the protection and abrasion resistance capacity of the concrete. It can significantly improve the anti-cavitation capability.

On the basis of the study, the silica fume concrete engineering community gradually accepted and has applied in Chinese longyangxia, Lijiaxia hydropower station, Gezhouba, Liujiaxia, Longyangxia, Ertan, small waves and sole many engineering use silica fume concrete. It can be said that the silica fume concrete wear-resistant material of the hydropower project in China to use than the larger impact. Nevertheless, after so many years, and engineering test summary of the necessary and objective assessment of the application of silica fume concrete, to improve the level of protection and abrasion resistance material and high-speed building surface protection sediment discharge abrasion resistant anti-cavitation design level of significance

In the construction of the pouring process, before the concrete condensation, when the bleeding rate of evaporation of surface moisture faster than concrete, the concrete surface, shrinkage cracks, or even dried white phenomenon. The smaller the speed of bleeding, plastic shrinkage is more serious. Silica fume concrete plastic shrinkage is more serious. It is mainly due to the incorporation of silica fume concrete is almost no bleeding. Silica fume concrete is easy to produce a temperature cracks. Early strength development of silica fume concrete quickly, the heat of hydration heat of concrete quickly, resulting in concrete hydration heat temperature rise in concrete and easy to have a greater temperature stress, the stress of shrinkage cracks the top to the stress concentration, shrinkage cracks to expand and extend even formed through the cracks.

Although the silica fumes concrete has high strength, high abrasion resistance and anti-cavitation performance. However, effect of the silica fume concrete is weaker than metal powder exporter expect. The reason is the existence of silica fume concrete the above shortcomings in engineering applications can not be ignored construction defects, resulting in a number of engineering to produce serious damage. Protection and abrasion resistance of concrete, the surface roughness and uniformity is an important technology indicators, surface roughness can not meet the design requirements of the concrete surface, the effect of the high-speed flow, will produce cavitation, once cavitation, no matter how the material will have to cavitation damage, the addition to the flow aeration is asked to streamline the water surface and to meet the flatness requirements of the design to prevent cavitation damage. Therefore, the silica fumes concrete surface roughness, which directly affects its anti-cavitation performance.

Application of silica fumes concrete in reservoir spillway mesoporous facilitate the construction, lower the cost, reduce cracking and increase strength. It achieves the quality assurance purpose. The excellent performance of silica fumes concrete makes it has good prospects. Mixing silica fume, fly ash and superplasticizer doped together, it can play to the additive effect. It is a technical mean for preparation of high-performance concrete.Source:http://www.mhcmp.com

by: anelwew

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