The invention relates to a process for preparing an alkali activated binder mixture comprising mixing: (i) 50 to 100% by weight of ultramafic rock, based on the weight of the binder mixture, (ii) 0 to 60% by weight of aluminosilicate precursor, based on the weight of the binder mixture, (iii) an alkali activator, wherein the ultramafic rock and aluminosilicate precursor are present in an amount of less than or equal to 95% by weight of the binder mixture, wherein the alkali activator dosage (R) is between 3 and 14, where R is given by the mass ratio: R=Mass of Na2O or K2O in the alkali activator100 Mass of the binder mixture, and wherein the activator modulus (M) is between 0 and 3, where M is a mass ratio given by: M=SiO2 or SiO2 Na2O K2O. The invention further relates to an alkali activated binder mixture, use of the alkali activated binder mixture, a method of making an alkali activated binder slurry, an alkali activated binder slurry obtainable by the method, use of the alkali activated binder slurry, a process for making a concrete structure from the alkali activated binder slurry, and a concrete structure obtainable from the alkali activated binder slurry.

Geopolymer compositions incorporating slag or other alumino-silicate and calcium containing binder components are described. The geopolymer compositions incorporate C-(N)-A-S-H/C-A-S-H gels providing improved adhesion strength and resistance to chemical attack. Methods of methods of making and using the geopolymers are further described, with the embodied geopolymers being compatible with multiple conventional application processes, including pouring, spraying, screeding, and troweling.

Method for manufacturing a concrete from activated slag, comprising at least the steps consisting of: a) arranging a premixture P of water and granulates, the temperature of the premixture P being at least equal to 10 C., b) arranging an activation system A comprising at least a co-binder, a chelating agent, an alkali metal carbonate and a carbonated material different from the alkali metal carbonate, c) incorporating the activation system A and a slag S by mixing them into the premixture P, the activation system A and slag S being introduced successively and/or simultaneously, d) continuing the mixing until a fresh concrete is obtained, and e) allowing the fresh concrete to cure.

The present disclosure relates to a visible light-catalyzed translucent concrete, and a preparation method and use thereof. The preparation method includes: extracting an iron oxide from a copper slag, mixing the iron oxide with TiO.sub.2 to obtain a photocatalyst, and then mixing the photocatalyst with an additive to obtain a photocatalytic slurry; preparing a concrete slurry using the copper slag after iron extraction as an aggregate; and pouring the photocatalytic slurry, the concrete slurry, and the photocatalytic slurry in sequence into a mold pre-laid with an optical fiber, to obtain the visible light-catalyzed translucent concrete. In the visible light-catalyzed translucent concrete, iron in the copper slag is used as a part of raw materials of the photocatalyst, and the copper slag after iron extraction is used as an aggregate to replace natural sand and gravel. This solves environmental pollutions caused by the copper slag and realizes resource utilization.