Concrete high-strength admixture, cement mixture and non-autoclaved ultra-high strength concrete product

Abstract

The invention discloses a concrete high-strength admixture, a cement mixture and a non-autoclaved ultra-high strength concrete product. The concrete high-strength admixture comprises the following raw materials by weight percentage: 20-80% of gypsum, 10-78% of an active mixing material, and 0.1-30% of an inorganic exciting agent. The concrete high-strength admixture has the advantage that high strength of the concrete product can be achieved by normal-pressure maintenance.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a high-strength concrete admixture, a cement mixture and an autoclaved-free ultra-high-strength concrete product. Background technique [0002] Prestressed High Strength Concrete (PHC Pipe Pile) is a kind of prestressed high strength concrete pile (PHC pipe pile) obtained through the pretensioning centrifugal forming process, and then through the normal pressure steam curing at about 85 ℃ and the high pressure steam curing at 180 ℃ under 10 standard atmospheric pressure. Cylindrical concrete pipe piles with concrete strength grade up to C80. In recent years, with the continuous and high-speed development of various domestic engineering constructions, PHC pipe piles have become the most widely used foundation at this stage due to their advantages such as short pile-making cycle, excellent mechanical properties, good pile material quality, and strong engineering geological adaptab...

AI Technical Summary

Problems solved by technology

Second, the PHC pipe piles cured by autoclaving have a high temperature out of the kettle. If the cooling measures are unreasonable, a large number of micro-cracks will easily occur inside the concrete, resulting in a reduction in the durability of the pipe piles.

Third, concrete products whose curing temperature exceeds 70°C will produce delayed ettringite formation (DEF) expansion under the condition of sufficient moisture and sulfate, which will lead to expansion and damage of the product. , its surrounding environment increases the risk of DEF expansion, shortens the life of the pipe pile, and may threaten building safety

Fourth, the autoclave equipment required for autoclave maintenance is not only expensive, but also may cause safety accidents such as explosions due to the failure of the safety interlock device, resulting in personal casualties and property losses

However, the current domestic autoclaved-free PHC pipe pile technology strength level is relatively low, only maintaining the strength level of C80 and C90, and rarely reaching the level above C120, which is far from Japan's autoclaved-free technology

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