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利用压汞法、扫描电子显微镜和透射电子显微镜研究了两种不同养护条件下水泥-矿渣复合胶凝材料硬化浆体的微观结构。结果表明:常温养护3 d龄期时,随着矿渣的掺入和掺量的增加,硬化浆体的孔隙率越大,大孔含量越多;硬化浆体微观形貌显示,掺矿渣试样的反应程度比纯水泥试样更低,密实程度较差。水化后期,复合胶凝材料的水化程度虽然比纯水泥试样低,但复合试样的孔隙率更低,孔径细化。纯水泥试样中水化硅酸钙(C-S-H)凝胶的微观形貌呈单向分布的纤维状,而复合胶凝材料试样中矿渣反应生成的C-S-H凝胶呈三维分布的箔片状,能更有效的隔断和填充连通的孔隙。在高温养护条件下,掺矿渣复合胶凝材料硬化浆体早期和后期孔隙率均较低,高温激发了矿渣早期的活性。
The microstructure of the hardened paste of cement-slag composite cementitious material under two different curing conditions was studied by mercury intrusion, scanning electron microscopy and transmission electron microscopy. The results showed that the porosity of the hardened paste increased with the increase of slag incorporation and dosage during 3 days of curing at room temperature. The larger the content of macropores was, the harder paste morphology showed that the slag- The reaction degree is lower than the pure cement sample, less dense. Although the degree of hydration of the composite cementitious material is lower than that of the pure cement sample in the late hydration stage, the composite sample has lower porosity and finer pore size. The microstructures of hydrated calcium silicate (CSH) gels in pure cement samples were fibrous in unidirectional distribution. The CSH gels produced by slag reaction in the composite cementitious materials showed a three-dimensional distribution of foil-like shape, Can more effectively cut off and fill the communication of the pores. In the condition of high temperature curing, the porosity of the hardened slurry mixed slag composite cementitious materials early and late are low, high temperature activated slag early activity.