Risk aversion plunged on the positive news of the Russia-Ukraine talks. After several days of rising oil prices, the price of precious metals continued to fall. Domestic futures markets remain stable for the time being.

Back in international markets, WTI crude futures briefly dipped below $100 a barrel, while Brent crude hit its lowest intraday level in nearly two weeks. Spot gold briefly fell below $1,900 an ounce. Comex gold futures closed down 1.1 percent at $1,918.4 an ounce. Comex silver futures closed down 1.14 percent at $24.91 an ounce. "Recently, crude oil prices have been extremely sensitive to changes in geopolitical news." Traders believe that the current oil price is still in the broad impact, Ukraine will still be a premium in the case, although the market further decline, but should not be too pessimistic, it is recommended to wait and see for the time being. The Ukrainian premium is still there and there will be some volatility in the silica fume market.

What is micro silica fume for concrete?

Micro silica fume is also well used in the concrete industry. Its physical characteristics include small particles, high purity, and pozzolanic solid activity. Adding micro silica fume to concrete can not only improve the properties of concrete in many aspects but also enhance. The adhesion and cohesion of concrete itself, can make the concrete play its role more and reduce the amount of rebound. The use of micro-silica fume has brought many advantages to the project; not only can the thickness of the concrete be formed at one time, but it also brings a lot of cost savings to the whole project and shorten the time required for the project.

Application of high-performance concrete proportioning design scheme

1) Compatibility: Micro silica fume has good compatibility with water-reducing agents, fly ash, mineral powder, and fiber;

2) Slump: Concrete has strong viscosity due to the phenomenon of gap filling, so the slump design scheme of concrete mixed with silica fume is 2~3cm higher than that of ordinary concrete;

3) The amount of mixing, production, and processing of high-strength concrete and shotcrete, the mixing amount of silica fume is 6~12% of the cement; the mixing amount of concrete for underwater engineering projects is slightly higher; the silica fume is used as a pump When the agent is used, the mixing amount is reduced to about 2%. Finally, the mixing ratio is confirmed by the mixing ratio test. The mixing of micro-silica fume mixed with cement and aggregate shall be constructed in strict accordance with the specifications, and at the same time, the maintenance shall be enhanced.

Ingredients and mixing

Generally speaking, the concrete industry usually uses densified silica fume, so manual or automatic feeding can be used.

2) Because of its unique ultra-fineness, the micro-silica fume must be put in immediately after feeding, and the micro-silica powder cannot be added to the concrete.

3) When the concrete is mixed with silica fume, the mixing time is 30~40s longer than ordinary concrete to obtain good uniformity.

4) There are no special requirements for the concrete of micro silica fume during transportation, just like ordinary concrete.

Watering and maintenance;

1) Vibration of micro-silica fume concrete requires high density, no vibration leakage, and no over-vibration. The vibration time is generally 10~30s;

2) Continuous supply of concrete is required to prevent cold stubble and cause hidden dangers. The stubble time cannot exceed 100 minutes;

3) It is essential to prevent the premature evaporation of water when protecting the concrete from silica fume. Therefore, after pouring, immediately cover the film, and lay sacks for watering and curing.

Use a woven bag for micro-silica fume in a plastic inner sealed bag, and pay attention to waterproof and moisture-proof during storage and transportation.

TRUNNANO is a concrete additives supplier with over 12 years experience in nano-building energy conservation and nanotechnology development. We accept payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.

If you are looking for high quality silica fume, please feel free to contact us and send an inquiry.

sales@cabr-concrete.com

Recently, the first press conference of the Boao Forum For Asia Annual Conference 2022 was held. Two flagship reports were released at the conference: "Asia's Economic Prospects and Integration Process 2022" and "Sustainable Asia and the World 2022-Green Transformation in Action in Asia".

The flagship report points out that the global economy will recover in 2021, and the pace of economic integration in the Asia-Pacific has not stopped even in the face of the impact of COVID-19. The Asia-Pacific region has provided new impetus for the world's economic recovery and institutional building.  

The report gives an outlook on the Asian economy, noting that a number of factors will affect Asian economic growth. For example, mutated strains such as Delta and Omicron have become more transmissible, and many economies are experiencing epidemic peaks again. The Ukraine crisis has triggered geopolitical changes in Asia and Europe, leading to higher commodity prices, which may affect the global energy supply and energy transformation.

The report pointed out that the Asian economy will still be in the process of recovery in 2022, but the growth rate may moderate. According to the report, Asia's economic growth in 2022 is likely to be lower than the current IMF forecast, which is projected at 4.8%.

Affected by several factors, the supply of the silica fume is erratic and thus its prices are expected to go higher in the future.

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