Normal-temperature-maintenance alkali-activated cementing material with low alkali dissolution quantity and preparation method thereof

Abstract

The invention provides a normal-temperature-maintenance alkali-activated cementing material with low alkali dissolution quantity and a preparation method thereof. The alkali-activated cementing material is prepared from the components in parts by mass: 100 parts of cementing powder, 5 to 6 parts of sodium silicate (with the modulus of 1.8 to 2.2 according to Na2O contained in the sodium silicate),1 to 5 parts of aluminate cement, and 1 to 4 parts of amorphous alumina, wherein the amorphous alumina and the aluminate cement are used as an aluminum-containing additive together; the mass parts ofthe aluminum-containing additive is 4 to 8 parts. The alkali-activated cementing material is prepared from the raw materials: Na2O and Al2O3 with the molar ratio of 0.97 to 1.08. According to the cementing material, through adding the high-activity aluminum-containing additive, the alkali dissolution quantity is less than or equal to 4 percent; meanwhile, during the preparation process, a bettercombination property can be achieved through normal-temperature maintenance.

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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