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Alkali-activated materials have significant shortcomings like poor volume soundness, easy efflorescence and so on, which have restricted their application to a certain degree. Nano modification is an important approach in solving the problem. Based on the test of hydration hardening characteristics, matrix porosity and the concentration of alkali ions leaching on the surface of the alkali-activated steel slag-slag material, the effects of the nano SiO 2 on matrix compaction and efflorescencedoi:10.13168/cs.2018.0023 fatcat:gwmv6ssxwbeyvhudxv5brhw5yi