Alkali-activated gelling material with low alkali dissolution rate cured at room temperature and preparation method thereof

Abstract

The invention provides an alkali-activated gelling material cured at room temperature with low alkali dissolution and a preparation method thereof. The alkali-activated gelling material includes in parts by mass: gelling powder, 100 parts; water glass, with Na contained therein 2 O meter, 5-6 parts, the modulus of described water glass is 1.8-2.2; Aluminate cement, 1-5 parts; Amorphous alumina, 1-4 part; Wherein, described amorphous alumina Together with aluminate cement, it is called aluminum-containing additive; the mass part of described aluminum-containing additive is 4-8 parts; The raw material of described alkali-activated cementitious material comprises Na 2 O and Al 2 o 3 , the Na 2 O and Al 2 o 3 The molar ratio is 0.97‑1.08. The gelling material is added with highly active aluminum-containing additives so that the alkali dissolution rate is ≦4%; at the same time, only normal temperature curing is required in the preparation process to achieve better comprehensive performance.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an alkali-activated gelling material cured at room temperature with low alkali dissolution and a preparation method thereof. Background technique [0002] Alkali-activated gelling material is a new type of gelling material that uses silicon-aluminum waste as the main raw material and is hydraulically hardened under the action of alkali. The material is considered as a low-carbon cementitious material because of its low energy consumption and low emissions during the preparation process, and it can provide similar properties to cement-based cementitious materials, and has become a research hotspot in recent years. [0003] Although the alkali-activated gelling material prepared from metakaolin-rich raw materials has many performance advantages such as fast strength development and excellent chemical erosion resistance, it also has two defects: one is that it needs a short period ...

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Problems solved by technology

[0003] Although the alkali-activated gelling material prepared from metakaolin-rich raw materials has many performance advantages such as fast strength development and excellent chemical erosion resistance, it also has two defects: one is that it needs a short period of time during the batching process. Curing at room temperature, then curing at high temperature, and then curing at room temperature is a relatively cumbersome process; the second is that the surface of the cementitious material is frosted after construction, also called pan-alkaline, which is manifested by the formation of "hoarfrost" or "white spots" on the surface of the cementitious material , not only affect the appearance, but also cause the adhesive force between the plastering mortar and the material matrix to decrease due to the loose "hoarfrost" in the subsequent construction, which will cause unsuccessful plastering or peeling, slag, etc.

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