Introduction to the use of Chengdu silica fume. If you are interested, you can learn more about it.
I. mixing method:
The construction mix proportion of silica fume concrete and castable shall be made by the laboratory. Construction shall be carried out in strict accordance with the mix proportion. In the mixing of silica fume concrete, silica fume shall be added to the mixer immediately after aggregate feeding. There are two procedures for joining:
1. Put in aggregate, then silica fume and cement for dry mixing, and then add water and other admixtures.
2. Put in coarse aggregate + 75% water + silica fume + 50% fine aggregate and mix for 15-30 seconds, then put in cement + admixture + 50 fine aggregate + 25% water and mix until uniform. The mixing time is 20-25% longer than that of ordinary concrete or 50-60 seconds. Silica fume shall not be added to the mixed concrete.
2、 Construction method:
There is no significant difference between the construction method of silica fume concrete and ordinary concrete, but it is necessary to organize and vibrate well during construction. The early strength of silica fume concrete will advance the final setting time, which should be paid attention to when plastering; At the same time, adding silica fume will improve the viscosity of concrete and greatly reduce bleeding, making plastering slightly difficult.
3、 Construction safety:
The construction safety of silica fume concrete shall be operated in strict accordance with the relevant construction specifications of concrete engineering. However, due to the light silica fume, it is strictly prohibited to throw materials at high altitude to prevent silica fume from flying.
Through the above introduction, I hope it can help you learn more about Chengdu silica fume.
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