Method for eliminating the alkali-aggregate reaction in concret and cement thereby obtained

摘要: Method for eliminating the dangerous alkali-aggregate reaction in concrete which contains hydrated cement obtained by alkaline activation of Portland cement. The formation this a compound can generate soluble aluminate is prevented reacting mineral composition activation, said being composed alumino-silicate identifiable its analysis spectrum Nuclear Magnetic Resonance (MAS-NMR) 27Al resonance at 66±5ppm corresponds to Q?3?(3Si)-type (Al04) tetrahedron. above-mentioned contains: a) 100 parts weight calcium alumino-silicate; b) 10-30 powdered synthetic alumino-silicates belonging class silicates whose mineralogical structure lamellar and MAS-NMR ?27?Al has least one main 20±5ppm and/or 50±5ppm relation AlCl?3?; c) 0-10 disilicate Ca(H3SiO4)2 (SiO4)tetrahedron polymerization degree (Q1) as determined value ?29?Si. geopolymetric quick setting characterized after equal 55±5ppm AlCl?3?, corresponding Q4(4Si)-type (AlO4)tetrahedron, 0±5ppm AlCl3, VI(AlO6) coordinated Al cation alumina hydroxide thioaluminate (ettringit). ratio between intensity (AlO4) (AlO6), (AlO4)/(AlO6) or 0.1 1.