High-strength alkali-activated cementing material and preparation method thereof: Fid-Bau Portal

High-strength alkali-activated cementing material and preparation method thereof

LING YU / ZHANG XIAFEI / GUAN GUANGBING / LYU NIAN / WANG ZEQUN / FANG XIAOZHENG

According to the high-strength alkali-activated cementing material and the preparation method thereof, polylactic acid and polyvinyl alcohol are introduced into raw materials for preparing the alkali-activated cementing material, and under the alkaline condition, sodium silicate and sodium hydroxide serve as alkali activators to form a large amount of highly uniform and compact Ca-Si-O-H and Ca-Al-Si-O-H gel, so that the high-strength alkali-activated cementing material is prepared. The polyvinyl alcohol is used as an active substance to further promote hydration, so that more hydrated calcium silicate gel structures are formed, the internal structures of pores are filled, the microstructure is denser, and the macro-performance of the alkali-activated cementing material is improved; after being degraded under an alkaline condition, the polylactic acid is adsorbed on the surfaces of the slag and the fly ash, so that the setting time of the alkali-activated cementing material is prolonged, and the quick setting performance of the alkali-activated cementing material is improved. And the non-degraded polylactic acid can inhibit the scumming phenomenon of the alkali-activated cementing material to a certain extent.

本申请提供了一种高强度碱激发胶凝材料及其制备方法，通过制备碱激发胶凝材料的原料中引入聚乳酸和聚乙烯醇，在碱性条件下，水玻璃和氢氧化钠作为碱激发剂形成大量高度均匀致密的Ca‑Si‑O‑H和Ca‑Al‑Si‑O‑H凝胶，聚乙烯醇作为活性物质进一步促进了水化，从而形成了更多的水化硅酸钙凝胶结构，孔隙内部结构得到填充，微观结构更加密实，碱激发胶凝材料的宏观性能得到提高；聚乳酸在碱性条件下降解后，吸附在矿渣和粉煤灰表面，延长碱激发胶凝材料的凝结时间，改善碱激发胶凝材料快凝的性能。未发生降解的聚乳酸还可以在一定程度上抑制碱激发胶凝材料的泛霜现象。

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