Silicon-rich magnesium nickel-slag anti-freezing cement and preparation method thereof

Abstract

The invention discloses silicon-rich magnesium nickel-slag anti-freezing cement. The cement comprises the following components: ordinary Portland cement, a silicon-rich magnesium nickel slag containedadmixture and dihydrate gypsum powder. The mass percent of the ordinary Portland cement is 70-90%, the mass percent of the silicon-rich magnesium nickel slag contained admixture is 10-30%, and the mass percent of the dihydrate gypsum powder is 1-5%. According to the invention, with the utilization of the excitation effect of lime, silicon-rich magnesium nickel slag has certain hydration activity,and the hydration activity of the activated silicon-rich magnesium nickel slag contained admixture is still lower than the hydration activity of the Portland cement, so that the Portland cement has adifference with the silicon-rich magnesium nickel slag contained admixture in hydration rate; and the volume is increased in the process that Mg(OH)2 is generated by magnesium components in the silicon-rich magnesium nickel slag, so that the number of harmful holes of the concrete is remarkably reduced, and thus the freezing resistance of the concrete is improved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a silicon-rich magnesium nickel slag antifreeze cement and a preparation method thereof. Background technique [0002] In low temperature and cold regions, the main cause of concrete damage is freeze-thaw damage, and the fundamental factor of freeze-thaw damage is that concrete contains pores and aqueous solution. As the liquid in the pores freezes and expands, microcrack damage occurs inside, and the damage will gradually accumulate and expand under the action of multiple freeze-thaw cycles, eventually leading to loosening and cracking inside the concrete. According to the influence of different pore sizes on the performance of concrete, Chinese scientists divide the pores in concrete into harmless pores (<200Å), less harmful pores (200Å-500Å), harmful pores (500Å-2000Å) and many harmful pores. (>2000Å), and it is believed that increasing the pores below 500Å and reduc...

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Problems solved by technology

However, none of the existing reports can significantly increase the number of harmless pores and reduce the water content of concrete. Therefore, it is impossible to fundamentally find a way to improve the frost resistance of concrete.

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