Ultrahigh-toughness concrete and preparation method thereof

Abstract

The invention discloses an ultrahigh-toughness concrete and a preparation method thereof. The ultrahigh-toughness concrete mainly comprises cement, silica fume, mineral slag, fly ash, quartz powder, quartz sand, steel fiber, nano calcium carbonate, water and a water reducing agent. The weight ratio of the silica fume to the cement is (10-20):100; the weight ratio of the mineral slag to the cement is (1-20):100; the weight ratio of the fly ash to the cement is (5-20):100; the weight ratio of the quartz powder to the cement is (30-38):100; the weight ratio of the quartz sand to the cement is (80-150):100; the steel fiber accounts for 2.0-4 vol% of the concrete; the weight ratio of the calcium carbonate to the cement is (0.1-5):100; the water-binder ratio is 0.16-0.22; and the weight ratio of the water reducing agent to the cement is (0.5-4):100. The concrete has the advantages of high strength, high toughness and favorable workability; the slump is greater than or equal to 180mm; and the concrete is pumpable and can be cast in place.

Description

Technical field [0001] The invention relates to a concrete, in particular to an ultra-high toughness concrete and a preparation method thereof. Background technique [0002] As the most widely used building material in the world today, concrete has the disadvantages of low flexural strength and high brittleness, which leads to cracks or even fractures in concrete in use, which seriously affects the overall safety and service life of the building. There are a large number of building structures and parts in modern buildings, such as high-speed rail viaducts, long-span sea-crossing and river-crossing bridge decks, and subways and other types of tunnel arch walls. Due to the complex and harsh stress environment, the bending strength must be used to maximize the strength. Potentially high toughness concrete material. In order to improve the toughness of concrete, steel bars have been adopted earlier and have been used in large quantities. After that, various fiber materials with be...

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Problems solved by technology

Although the flexural strength of the concrete disclosed in the above-mentioned patent has been improved to a certain extent, in some specific engineering fields, such as steel bridge deck pavement, due to its large fatigue deformation, the existing concrete is difficult to meet the requirements. Therefore, Urgent need to study a higher toughness concrete material