Antifreeze anticorrosion durable concrete and preparation method thereof

Abstract

The invention discloses an antifreeze anticorrosion durable concrete. The concrete comprises the following components, by weight, 500 parts of a gelling material, 700-715 parts of medium sand, 1050 parts of broken stone, 164 parts of water and 10.56-18 parts of a water reducer, wherein the gelling material comprises 54-56wt% of cement and 44-46wt% of powder A; and the powder A comprises the following components: 30-35wt% of slag, 20-25wt% of zeolite, 35-40wt% of coal ash, 5-10wt% of long bluestone and 0-7wt% of quicklime. The invention also discloses a preparation method of the concrete. The preparation method comprises the following steps: 1, weighing raw materials of the components of the powder A according to above proportions, crushing by an ultrafine mill, and uniformly mixing; 2, weighing raw materials of the components of the concrete according to above proportions; 3, sequentially adding ordinary Portland cement, the powder A, the medium sand and the broken stone to a concrete stirring device, and stirring for 2-3min to fully and uniformly mix; and 4, slowly adding well weighed water and the well weighed water reducer to the obtained mixture while stirring, and continuously stirring for 1-2min to obtain the concrete. The concrete of the invention is high performance concrete which can resist strong sulfate corrosion, strong chloride corrosion, freeze-thaw cycles and drying and wetting cycles.

Description

technical field [0001] The invention relates to concrete, in particular to a frost-resistant and corrosion-resistant durable concrete and a preparation method thereof. Background technique [0002] The chemical corrosion of sulfate on concrete is the result of two chemical reactions: one is to react with calcium aluminate hydrate in concrete to form calcium sulfoaluminate (ettringite), and the other is to combine with calcium hydroxide in concrete to form sulfuric acid Calcium (gypsum), both compounds cause volume expansion that cracks the concrete. If magnesium ions exist, it can also form non-gelling magnesium hydroxide with calcium hydroxide, further reducing the compactness and strength of concrete, and aggravating corrosion. CO 2 Gradually deepen from the surface of the concrete, carbonize to the surface of the steel bar, destroy the passivation film on the surface of the steel bar, and O in the air 2 Under the action of water and water, rust (Fe 3 o 4 ), Fe 3 o ...

AI Technical Summary

Problems solved by technology

However, the cost per ton of salt-resistant salt cement reaches 800 yuan / ton, and it is produced in small factories and small kilns, so the quality is unstable. With the implementation of the national energy conservation and emission reduction policy, the supply of this cement is becoming more and more difficult, and it cannot meet the construction period requirements.

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