Non-autoclaved high-strength high-performance concrete admixture and production method thereof

Abstract

The invention relates a concrete admixture mainly applied to the field of preparation of prestressed high-strength concrete (PHC) pipe piles, in particular to a non-autoclaved high-strength high-performance concrete admixture and its method for manufacturing concrete; the non-autoclaved high-strength high-performance concrete admixture allows the high-pressure autoclaving in the traditional technological process of prestressed concrete pipe piles, provides reduced remaining mortar, improved efficiency, economized resources and environmental protection, and can also gain better economic benefit. The non-autoclaved high-strength high-performance concrete admixture comprises 20-30% of superfine slag powder, 10-20% of coal gangue powder, 10-15% of silicon powder, 5-10% of clinoptilolite powder, 5-8% of calcined kaolin, 5-10% of calcium material, 5-15% of gypsum, and 0.5-1.0% of a liquid functional regulator.

Description

technical field [0001] The invention relates to a concrete admixture mainly used in the field of preparation of prestressed high-strength concrete pipe piles (PHC), in particular to an autoclaved high-strength and high-performance concrete admixture and a production method thereof. Background technique [0002] Prestressed high-strength concrete pipe piles have been widely used in construction projects such as high-rise buildings, long-span bridges, expressways, ports, and wharfs due to their advanced technology, high degree of industrialization, stable quality, and short construction period. . [0003] At present, most concrete ingredients are mixed with ordinary slag powder or fly ash to reduce production costs, but the cost reduction is only from the perspective of ingredients, and cannot be greatly reduced, and both normal pressure steam curing and high temperature and high pressure steam curing are used in production. Double curing to realise. [0004] At present, the...

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Problems solved by technology

[0005] The disadvantages of this traditional process mainly include: ①The initial investment of the autoclave is relatively large, and the equipment maintenance cost is high

A 35-meter-long autoclave requires an investment of millions of dollars

②Large energy consumption: autoclave curing needs to consume a lot of steam, and the energy of these steam mainly comes from the combustion of coal

③Large environmental pollution: the flue gas emitted by coal-fired boilers is the main source of PM2.5 in the air

④Poor production safety: As a pressure vessel, the autoclave may cause an explosion accident due to the failure of the safety interlock device

⑤The PHC pipe piles cured by autoclaving have too large crystal-to-glue ratio, and the temperature of the pipe piles is high, which is prone to cracks caused by temperature stress, which increases the brittleness of the concrete, and the concrete is easy to peel off during piling, which affects the durability of the pipe piles. Sex

Among them, the incorporation of chemical activators such as sulfate may cause expansion of the mineral cementitious material and cause damage, which greatly reduces the durability of concrete.

[0008] In summary, it can be seen that although the proportion of the non-steamed concrete admixture in the prior art may partially exempt the steam-cured step, its formula is still unreasonable, which may cause excess slurry, short life, or damage to the concrete

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