Composite clay substituting natural sand and premixed concrete adopting composite clay as raw material

Abstract

The invention belongs to the field of a building material, and discloses composite clay substituting the natural sand and premixed concrete adopting the composite clay as a raw material. The composite clay comprises the following raw materials by weight percent: 45 to 75 percent of clay, 3 to 10 percent of shell powder, 5 to 20 percent of coal ash, 5 to 20 percent of slag, 5 to 20 percent of rice hull ash, 0.5 to 2 percent of quick lime and 0.5 to 1.5 percent of sodium carbonate. All components are added into water to be premixed, stirred, ground and rolled, and the obtained mixture is dried, granulated, screened and graded at the temperature of 200 to 300 DEG C to obtain a raw material for stirring the concrete. The composite clay is composited with cement, stones, mineral powder, a water reducing agent and water according to a given ratio to obtain the premixed concrete with excellent slump and tensile strength. The composite clay is adopted to substitute the natural sand to be used as fine aggregates in the premixed concrete, so that the corrosion resistance and durability of the concrete can be improved; moreover, the resources such as rice shell and shells are adequately utilized, the waste is converted into treasure, the market popularization value is high, and the application prospect is wide.

Description

technical field

[0001] The invention belongs to the field of building materials, and specifically relates to a composite clay replacing natural sand and ready-mixed concrete using it as a raw material, especially suitable for ordinary concrete, high-performance concrete, ultra-high-strength concrete, fiber concrete, active powder concrete, etc. Production. Background technique

[0002] The main building material used in structures in my country is concrete, and natural sand is its main fine skeleton. At present, natural sand is used in most areas. Natural sand belongs to local resources and cannot be regenerated in a short period of time. With the increase of construction volume, the natural sand in many areas of our country is almost exhausted. At the same time, because the over-exploitation of natural river sand will cause damage to the ecological environment, many places have strictly prohibited or restricted the mining of natural river sand, which has led to the supply a...

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