High-plastic-forming fly ash steam curing brick

Abstract

The invention discloses a high-plastic-forming fly ash steam curing brick. The brick comprises, by weight, 75-80% of fly ash, 10-15% of slag, 2.5-3.5% of cement, 4.5-5.5% of calcium oxide, 0.4-0.6% of gypsum and 2.3-2.7% of fly ash plasticizing agent. The use amount of the special fly ash brick plasticizing agent is small, the plasticizing effect of the special fly ash brick plasticizing agent is good, the proportion of the fly ash brick is improved greatly, the operation is simple in production, the production cost is reduced, the source of raw materials is wide, the cost is low, and the production cost is reduced greatly. The invention also provides a formula and a production process for producing the high-proportion fly ash brick. The process is combined with the fly ash brick plasticizing agent, the fly ash brick is produced through a steam curing method, the device investment is few, the product energy consumption is little, the total cost of products is reduced effectively and economic benefits and social benefits are high.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a high-plasticity steam-cured fly ash brick. Background technique [0002] From June 1, 2000, some coastal cities and cities with insufficient land resources have banned the use of clay bricks, and restricted the production and use of other clay products according to conditions. In response to this situation, it is necessary to use fly ash instead of clay to produce fired bricks. [0003] Fly ash is a high-temperature-treated raw material. It is a barren material without plasticity. It is impossible to produce fired bricks with only fly ash as a raw material. Consolidation, resulting in failure to form, must add an appropriate amount of binder. [0004] Fly ash unburned bricks are generally prepared by autoclaving or steam curing. Fly ash unburned bricks generally need to add cement, lime, gypsum, red mud, and other materials. Most of the fly ash bricks in the prior art have...

AI Technical Summary

Problems solved by technology

make the market unbearable

It also takes a long time to dry. In an artificial environment, it still takes 36-48 hours to dry with a drying medium.

The roasting time is about 17-20 hours, and the temperature needs to be increased stepwise during the roasting process, the process control is not easy to master, and the quality of the bricks is difficult to guarantee

[0008] Studies have shown that autoclaved bricks can produce hydration products such as tobermolite with good crystallinity, and its shrinkage is small, so it is better used in construction; but the autoclaved method takes up a lot of money in equipment investment. At the same time, it also brings the inevitable result of high power consumption and high product cost.

[0009] There is no problem with the strength of steam-formed bricks, but the product shrinks greatly, and the wall is easy to crack, because the main hydration product is gel such as C-S-H

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