Foaming agent is an important component in the preparation of foamed concrete and a key component determining the performance of foamed concrete. It affects the pore size, uniformity, hole sealing and other indexes of foamed concrete, and ultimately affects the mechanical properties and durability of foamed concrete. Therefore, the selection of suitable foaming agent becomes the key step in the preparation of high performance foamed concrete. Through a large number of experiments, the high performance foam should meet the needed for the preparation of foam concrete after the requirements of the characteristics of stability, uniform, fine, its unit volume contains organic matter (surface active substance) as small as possible, foaming agent into foam, containing a large amount of surfactant changes affect cement after mixed with cement, will reduce the material mechanical properties, the greater the stability of the foam, in most cases, the surface active substance content per unit volume will be, the more the greater the influence of cement is, it is unfavorable for the strength of the foam concrete measures such as. High stability of the foam its stability is very good, the bubble exquisite and tiny, but support the air foam stability is unit volume contains a lot of surface active substances, when added to cement, excess surfactant inevitably negative effects on the cement hydration, but conversely, poor stability of bubble may just after mixed in cement (sand), is a large amount of damage, is not suitable for the preparation of high foam concrete.
The application of various foamed concrete admixtures represented by water reducer is one of the marks of modern high performance concrete, and also one of the characteristics of high performance foamed concrete should be low water-binder ratio. At present, the domestic production of foam concrete when a large number of admixtures such as high-efficiency water-reducing agent is not common, cement (sand) slurry mixing, the use of cement cement ratio is generally around 0.5, or even higher. Different from other concrete, foam concrete preparation when mixed with bubble type water film, its constituent besides surfactant, air, is a large number of moisture, therefore on bubble contains water (because bubble ultimately broken into water), foam concrete of water-binder ratio above 0.6, after a large number of air and water into the mechanical properties of the foam concrete is very low, so the preparation of high performance foam concrete need with the help of high efficiency water reducing agent, slash when mixing cement (sand) water/cement ratio, in the laboratory using a new type of poly carboxylic acid salt water reducing agent, water/cement ratio can be reduced to 0.2 or so, Can greatly improve the strength of the substrate. In addition to water reducer, other commonly used admixtures used in high-performance foamed concrete (such as hydrophobic agent, coagulant, early strength agent, foam stabilizer, etc.) are also necessary components for the production of high-performance foamed concrete.
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