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How to Produce High Quality Concrete
May 07, 2020
Concrete with a strength level greater than or equal to C50 is called high-strength concrete while uniform and dense concrete with excellent durability is called high performance concrete. Concrete with the above properties is called high-strength high-performance concrete.
The performance of high-strength high-performance concrete is so superior that it must have strict requirements on the equipment and the selection of raw materials. The small portable concrete batch plant is a popular kind of concrete batch plant, well known for flexible movement and quick installation.
For meeting high requirements of concrete, Haomei small mobile concrete batch plant adopts independent weighing system and twin shaft concrete mixer. In addition to the function of the mobile concrete mixing plant, the selection of raw material is also very important.
There are raw materials needed for making concrete: cement, silicon powder, slag, fly ash, Zeolite powder, metakaolin, additives, sand and stone. Then how is concrete produced with these materials?
1. Cement
The amount of cement in 1 m3concrete should be controlled within 500kg, and the amount of cement should be reduced as much as possible. The total amount of cement and mineral admixture should not be greater than 600kg / m3.
2. Admixture
Silicon powder
The suitable dosage of silica powder is 5% ～ 10% of cement dosage. The research results show that silica powder is very significant for improving the strength of concrete. When 6% -8% silica powder is added, the strength of concrete can generally be increased by more than 20%.
Slag
The dosage is generally controlled between 20% and 50%. The greater the fineness of the mineral powder, the higher its activity and the more significant the strengthening effect, but the cost of grinding is also greatly increased.
Fly ash
The dosage is generally controlled between 20% and 30%. The effect of Class I fly ash is similar to mineral powder, and its crack resistance is better than mineral powder.
Zeolite powder
It can effectively improve the cohesion and water retention of concrete, and enhance the internal maintenance, thereby improving the strength and durability of the concrete in the later period. The dosage is generally 5% to 15%.
Metakaolin
The research results show that the addition of metakaolin can significantly improve the early strength and long-term compressive strength, flexural strength and tensile strength of concrete.
3. Additives
High-efficiency water-reducing agent is a commonly used admixture of high-strength and high-performance concrete. The water-reducing rate is generally required to be greater than 20%, so as to reduce the water-cement ratio and increase the strength to a large extent.
4. Sand and stone
Generally, it is better to choose a well-graded medium sand, and the fineness should be greater than 2.6. The mud content should not be greater than 1.5%. When preparing concrete above C70, the mud content should not be greater than 1.0%.
The gravel should be selected with gravel, the particle size of large aggregate should not be larger than 25 mm, and the strength should be 1.20 times the strength of concrete or more. The mud content should not be greater than 1.0%. For concrete with a strength level greater than C100, the mud content should not be greater than 0.5%.
Original source: https://www.concretebatchplanthm.com/a/how-to-produce-high-quality-concrete.html
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