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What raw materials are needed to make foam concrete

wallpapers Tech 2020-05-07


The raw materials required for the preparation of foam concrete mainly include cement, water, and foaming agent. In addition, a certain amount of fillers and additives can be added during the preparation of foam concrete, which can reduce costs on the one hand and Effectively improve the fluidity of foam concrete slurry. Commonly used types of fillers include sand, fly ash, ceramsite, slag, gravel chips, expanded perlite, etc .; commonly used types of additives are water reducing agent, accelerator, retarder, early strength agent and foam stabilization Agent. The raw materials used in foam concrete are: cement, fly ash, water reducing agent, accelerator, a foaming agent.

cement

Cement is the main source of foam concrete strength. Generally speaking, the strength of foam concrete is different for different types of cement. For low-density foam concrete, the strength level of cement is higher.

Fly ash

Fly ash is an artificial pozzolanic material, which has only low gelation activity. Its mineral composition is mainly quartz, mullite, hematite, magnetite, and glass body and unburnt carbon particles, in which the glass body can react with the calcium hydroxide generated when the lime or cement is hydrated at normal temperature, This produces hydrated products with gelling properties.

Blowing agent

The blowing agent is a type of surfactant or surface-active substance, and its aqueous solution introduces air through external action and generates a large amount of foam. The foam used in foam concrete should be as small, uniform, and stable as possible, and the quality of the foaming agent is the key.

Foam is the core part of foam concrete. The stability of foam concrete insulation, strength, water absorption rate, and other aspects mainly depends on the shape, size, and wall thickness of the pores. The key to these factors is the development of The stability of the foam emitted by the foaming agent depends on the quality of the foaming agent.

Water reducer

The water reducer is a high molecular surfactant. After being used in cement, these high molecular substances adsorb on the surface of cement particles and reduce the surface energy of cement particles to form a strong, negatively charged electric field. Cement floc particles coated with a large amount of free water are dispersed due to electrostatic repulsion, releasing the wrapped water, thereby improving the fluidity of the fresh concrete slurry.

Foam stabilizer

The role of the foam stabilizer is mainly to stabilize the foam. According to the different foam stabilizing mechanism, foam stabilizing agents are mainly divided into two categories: 1) increase the thickness of the foam liquid film, represented by sodium lauryl sulfate; 2) increase the foam's self-repair ability, represented by triethanolamine.

Polypropylene fibers

The mechanism of fiber crack arrest is to delay the propagation of cracks in concrete. After the concrete material has cracks, the randomly distributed fibers can withstand the tensile stress across the cracks, thereby increasing the tensile strength of the concrete. The elastic modulus of polypropylene fiber is much higher than that of foam concrete, which can significantly inhibit crack propagation.

The above are all the raw materials needed to prepare foam concrete, do you understand?


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