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Study on strength and microstructure of composite mineral admixture cement-based materials

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Document pages: 10 pages

Abstract: Two or three mixed mineral admixtures (glass powder (GP), limestone powder (LP) and steel slag powder (SP) were measured by battery solution compression tester The morphology and microstructure characteristics of hydration products of composite cementitious materials were studied by means of XRD, TG-DTA, SEM and other microanalysis methods. The mechanical properties of cement-based materials were analyzed to determine the most suitable type and content of mineral admixture. The strength of GP samples developed very slowly in the early stage, but increased rapidly in the later stage. In mineral admixture There are micro aggregate effect and pozzolanic reaction. In the early stage, the micro aggregate effect is weakenedaste porosity and the small particles connected with the cement hydration products to enhance its strength. In the later stage, the pozzolanic reaction of some components in the complex powder occurred and consumed part of the calcium hydroxide to form C-S-H gel, thus improving the hydration environment. Also, the produced C-S-H gel made the structure more compact, which improved the structure’s strength.

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