Decrypt the Amount of Cement in Foam Concrete

What are the raw materials of bê tông bọt?

The main components of foamed concrete are cement, tro bay, khói silic, chất xơ, vân vân. Some proportions have more cement content, and some proportions have less cement proportions, so specific problems must be analyzed in detail. Because foamed concrete is mostly cured under normal temperature conditions, and a large amount of foam is added, these two factors determine that its cement ratio will be higher.

What is ALC?

ALC is the abbreviation of autoclaved lightweight concrete, which is a kind of high-performance autoclaved aerated concrete (ALC). ALC board is made of fly ash (or silica sand), xi măng, chanh xanh, vân vân. là nguyên liệu chính, and is cured by high-pressure steam to form a porous concrete sheet (containing processed steel reinforcement). ALC board can be used as wall material and roof panel. It is a new type of building material with superior performance. ALC board first appeared in Europe, and Japan, Europe and other regions have more than 40 years of production and application history. Hiện tại, the production technology and production equipment of domestic manufacturers are mainly imported from Japan and Germany.

Foam concrete is fundamentally different from ALC. Because ALC adopts autoclave, it mainly relies on the hydration reaction of fly ash and lime under high heat and pressure to produce gelation. Cement is an auxiliary material.

While foam concrete is produced at room temperature, the active microaggregate will not quickly produce hydration reaction, and its solid foam still depends on the cementing effect of cement. Vì thế, the mixing ratio of foamed concrete must be cement as the main body, and high cement Ratio.

Trong hoàn cảnh bình thường, the amount of cement should account for more than 30% of the total amount of dry materials, Và 30% should be the minimum use amount for its normal temperature curing. When pouring on site, the proportion of cement should account for more than 60% of the total dry materials. For normal temperature foamed concrete with a density below 600 kg/m3, the proportion of cement should not be less than 70% of the total material. When the density is below 400 kg/m3, the conventional proportion should account for more than 90% of the total dry material.

The following factors should be considered in the design of cement ratio:

(1) Xi măng đa dạng. Các loại xi măng có cường độ sớm và muộn cao (chẳng hạn như xi măng Portland nhanh kép) có thể giảm tỷ lệ xi măng một cách thích hợp, and cement types with low late strength or low early strength should increase the cement proportion;

(2) Cấp cường độ của xi măng. High-strength grade cement (chẳng hạn như 42.5, 52.5, vân vân.) can reduce the proportioning amount, và xi măng cấp cường độ thấp nên tăng lượng theo tỷ lệ;

(3) Chất lượng xi măng. For large plants’ new dry-process rotary kiln cement, the mixing ratio can be appropriately reduced, while for small plants, shaft kiln cement or cement with a large mixing ratio should be appropriately increased;

(4) Density and strength requirements of the product. Mật độ thấp hoặc yêu cầu cường độ cao hơn nên tăng tỷ lệ xi măng, yêu cầu mật độ cao hoặc cường độ thấp hơn có thể làm giảm tỷ lệ xi măng;

(5) Initial growth temperature. The initial curing temperature after pouring (đổ) is lower (<25°C). The proportion of cement should be increased. When the initial curing temperature is high (25℃-45℃), the proportion of cement can be appropriately reduced. If steam curing or autoclave is used, it is still strong to reduce the proportion of cement;

(6) Variety and activity of active micro-aggregate (chất phụ gia). Việc sử dụng các loại cốt liệu vi lượng có hoạt tính cao có thể làm giảm tỷ lệ xi măng (chẳng hạn như xỉ siêu mịn), trong khi việc sử dụng các cốt liệu vi mô có hoạt tính thấp (chẳng hạn như tro bay thứ cấp) có thể tăng tỷ lệ xi măng.

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