Steam curing-free high-strength cement-wood chip plate and preparation method thereof

Abstract

The invention discloses a steam curing-free high-strength cement-wood chip plate and a preparation method thereof. The steam curing-free high-strength cement-wood chip plate comprises, by weight, 60-100 parts of cement, 20-60 parts of an active admixture, 10-12 parts of wood chips, 0.8-1.2 parts of thermal insulation aggregate, 7-9 parts of ceramsite, 0.3-0.5 parts of short fibers, 0.3-0.5 parts of an auxiliary agent and 45-50 parts of water. The preparation method comprises mixing cement, the active admixture, short fibers, water and the auxiliary agent to obtain a uniform mixture, adding wood chips, thermal insulation aggregate and ceramsite into the mixture, carrying out stirring to obtain a uniform mixture, laying a net, carrying out rolling flattening, then carrying out molding, loading a vehicle with plate blanks, transporting the plate blanks into a primary curing kiln, carrying out demolding, carrying out stacking, carrying out secondary curing, and naturally drying the plates so that water content is in a range of 5-10%. The steam curing-free high-strength cement-wood chip plate has excellent integrated physical properties and completely satisfies the national industry standard JC / T 411-2007 of cement-wood chip plate.

Description

technical field [0001] The invention relates to a steam-cured high-strength cement sawdust board and a preparation method thereof. Background technique [0002] With the development of the construction industry and the improvement of building function requirements, especially the improvement of fire protection, heat preservation, earthquake resistance, light weight, high strength and other functions or performance requirements, cement sawdust board has simple production process and good physical and mechanical properties. Therefore, it is a new type of building material with high promotion and use value. It uses ordinary portland cement or slag portland cement as the cementing material, wood chips as the main filler, wood wool or wood shavings as the reinforcement material, adding water and admixtures, forming by flat pressing, maintaining pressure and adjusting humidity Construction panels made by processing and other processes. Cement sawdust boards are suitable for resi...

AI Technical Summary

Problems solved by technology

Using this method, the pretreatment process of wood shavings and wood chips is cumbersome, and there is only a size requirement but no moisture content requirement

If the moisture content of wood shavings and wood chips cannot be controlled, it will not be possible to ensure the stability of the raw material preparation for the production of cement wood chip boards, and if the wood shavings and wood chips do not reach a certain storage and drying period (generally stored in the open air for more than three months), the internal polyvalenides will Sugar and other substances will have an anti-coagulation effect on the hardening of inorganic gelling materials, which will seriously affect the physical and mechanical properties of the product

Aluminum sulfate solution can penetrate into the capillary pores of shavings and wood chips, and its hydrolyzed product, aluminum hydroxide, has a good adsorption effect on pentosan, and its treatment effect is better than that of sodium silicate, but the introduced sulfate ion will Rebar Causes Corrosion

Compared with the wet method, the semi-dry method can save a lot of water, reduce water pollution, and greatly improve the environment, but it also has the following defects: (1) The production cycle is long, and it is necessary to form the initial strength of demoulding, even under the condition of hot pressing at 60-80°C It also takes 5 to 8 hours to store, and there are stricter requirements on the storage period of wooden materials; (2) Increased production auxiliary facilities, such as backing boards, stacking devices, etc., make the production workshop occupy a larger area; (3) The plate produced by this process has a thickness tolerance, and sanding treatment needs to be considered

This method uses steam curing, which effectively shortens the curing time, but also has the following defects: the types of sawdust, particles, moisture content and other indicators are not explained; sodium carbonate is used as an accelerator, and the later strength of cement products is greatly reduced. Generally, anhydrous gypsum is often used to reduce the alkali content and increase the later strength. Anhydrous gypsum is not mentioned in this method. Smaller, generally around 25%

When short fibers are used, the fibers are three-dimensionally oriented in the product; the curing system adopts steam curing, which requires large investment and high energy consumption

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