Impermeable concrete and proportioning method thereof

Abstract

The invention discloses impermeable concrete and a proportioning method thereof. The impermeable concrete comprises cement; PII type Portland cement with strength of not lower than 42.5 grade; coarseaggregate containing 5-25 mm continuous graded broken stone; fine aggregate containing natural river sand; an admixture containing fly ash and mineral powder; and an additive, which comprises a waterreducing agent with a water reducing rate of not lower than 25% and a solid content of not lower than 20%; wherein the cement, the coarse aggregate, the fine aggregate, the admixture and the additiveare mixed and stirred under the action of water to form the impermeable concrete. The technical problems that a conventional impermeable concrete is large in gap, high in manufacturing cost and long in maintenance period due to the material ratio and is not suitable for the secondary lining waterproof requirement in tunnel engineering are solved.

Description

technical field [0001] The application of the present invention relates to the field of concrete building construction, in particular, to a kind of anti-seepage concrete and its proportioning method. Background technique [0002] Secondary lining impermeable concrete is an important part of tunnel waterproofing and drainage, and its performance has a decisive impact on tunnel construction and waterproofing and drainage. Secondary lining concrete has the characteristics of large volume, high fluidity, high impermeability and low strength. At present, the micro-expansion waterproofing agent commonly used in the secondary lining impermeable concrete has the problem of high unit price and large dosage, and the economic benefit is poor. And it needs long-term moisturizing and health preservation, and it is difficult to operate on the vault of the tunnel, which has a great impact on the construction progress. [0003] Although the anti-seepage concrete prepared with traditional ...

AI Technical Summary

Problems solved by technology

At present, the micro-expansion waterproofing agent commonly used in the second lining impermeable concrete has the problem of high unit price and large dosage, and the economic benefit is poor

And it needs long-term moisturizing and health preservation, and it is difficult to operate on the vault of the tunnel, which has a great impact on the construction progress

[0003] Although traditional waterproofing agents are used to prepare impermeable concrete to easily meet the design impermeability grade requirements, it is difficult for low-grade concrete to meet the 56d electric flux 1000C index

In the centralized mixing station, various types of admixtures such as water reducing agent and waterproofing agent are stored and used at the same time for daily storage management. Simultaneous use has brought a lot of inconvenience, and there are hidden dangers such as easy confusion and use.

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