Alkali-free accelerator for additive manufacturing buildings, structures or components thereof

Abstract

The invention provides an alkali-free accelerator for additive manufacturing buildings, structures or components thereof. The alkali-free accelerator is prepared by a method which comprises the following steps: a magnesium-containing compound and/or an aluminium-containing compound is thrown in an aqueous solution of fluosilicic acid, or a magnesium-containing compound and/or an aluminium-containing compound is added into the aqueous solution of fluosilicic acid, and an optimal method is as follows: the magnesium-containing compound and/or an aluminium-containing compound and water are stirred in order to prepare suspending liquid, and then the aqueous solution of fluosilicic acid is slowly added into the suspending liquid; and at least one kind of polyhydroxyl dispersion reinforcing agent is optionally added. The accelerator has a long stable storage life, and has superior rapid hardening effects and long-term strength maintenance performance for cement-containing cementing agents.

Description

technical field [0001] The invention relates to a quick-setting agent for a cement-containing cement, a preparation method and a use method. Background technique [0002] Accelerator is an admixture that makes cement-containing cement harden quickly and produce a certain strength. It is widely used in tunnel spraying mortar or concrete construction, emergency repair construction, and the additive manufacturing of buildings, structures or their components that have emerged in recent years. Its main purpose is to speed up the setting time of the cement, speed up the construction, reduce springback, improve the early strength without reducing the later strength, and meet the construction requirements of special projects; the development of additive manufacturing technology makes the construction industry change from the traditional construction mode Moving towards the factory manufacturing mode is the biggest breakthrough in the construction industry in this century. Additive ...

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Problems solved by technology

The patent CN201110112424 of the China Academy of Building Materials Sciences discloses an alkali-free liquid quick-setting agent with aluminum sulfate as the main quick-setting component. Organic amines are used as viscosity-increasing components to increase the thickness of the spray layer and reduce rebound loss. The coagulant will cause the loss of strength in the later stage; the patent (200610098296.0) applied by Jiangsu Bote New Material Co., Ltd., the quick-setting agent prepared by it has a large amount in concrete, usually 7-10% of cement, and some eve

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