High-performance pre-dispersed silicon mortar concrete and preparation method thereof

Abstract

The invention discloses high-performance pre-dispersed silicon mortar concrete and a preparation method thereof. The concrete comprises the following components in parts by weight: 60-760 parts of cement, 5-200 parts of silicon mortar, 0-300 parts of other admixtures, 0-150 parts of water, 1-30 parts of an additive, 500-1000 parts of sand and 600-1600 parts of stone. The preparation method comprises the steps of (1) preparing the high-performance pre-dispersed silicon mortar; (2) metering and adding the sand, the stone, the cement and the admixtures and stirring for 0-30 seconds; (3) meteringand adding the silicon mortar and stirring for 5-90 seconds; (4) adding the water and the additive and stirring for 30-300 seconds; and (5) obtaining the high-performance pre-dispersed silicon mortarconcrete. According to the method disclosed by the invention, as the silicon mortar aggregate is effectively dissociated into dispersed slurry with smaller particles, the prepared high-performance pre-dispersed silicon mortar concrete covers concrete of various grades of C20 or above, and has the characteristics of good workability, small workability loss, low viscosity, good cohesiveness, no bleeding, adjustable setting time and the like. Under the same strength grade, the cement consumption is obviously reduced, the cost is greatly reduced, and the strength and the durability are improved.

Description

Technical field[0001]The invention belongs to the technical field of application of silica fume, a high-activity auxiliary cementing material in building materials, and specifically relates to high-performance pre-dispersed silica fume concrete used in concrete, especially in early-strength, steam-cured concrete. And its preparation method.Background technique[0002]Silica fume is a large amount of highly volatile SiO produced in the submerged electric furnace when smelting ferrosilicon and industrial silicon (metal silicon)2And Si gas, after the gas is discharged, it is rapidly oxidized and condensed to precipitate with air. The appearance of silica fume is off-white powder, the refractoriness is greater than 1600℃, the particles are very fine, the average particle size is 0.1-1μm, which is 1 / 50-1 / 100 of ordinary cement particles, and the specific surface area is 15000-25000m2 / kg. The main component of silica fume is amorphous silica, which accounts for more than 85%. The chemical c...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a high-performance pre-dispersed silica mortar concrete and its preparation method, which can effectively solve the problem that the existing silica mortar dispersant has retarding effect and the dispersion effect of silica fume in the slurry is insufficient. Poor workability of silica mortar concrete, large loss of workability, high viscosity, low steam-cured demoulding strength, and insufficient early strength, etc.

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