A kind of anti-crack concrete and preparation method thereof

Abstract

The invention discloses a crack-resistant concrete and a preparation method thereof. The crack-resistant concrete is prepared from the following raw materials in parts by weight: 300-450 parts of cement, 2-10 parts of retarding water reducer B, and 40-75 parts of pulverized coal Ash, 60‑100 parts polypropylene fiber, 15‑30 parts silane coupling agent, 40‑65 parts steel fiber, 6‑15 parts silicon powder, 800‑900 parts gravel, 600‑780 parts sand, 25‑45 parts Tuff, 10-15 parts of bentonite, 10-20 parts of water reducer A prepared from pulp waste liquid, 15-30 parts of sodium bicarbonate and 200-250 parts of water; the preparation method is: cement, fly ash, crushed After stirring stone and sand for 30-40min, then add steel fiber, tuff and bentonite, stir for 30-40min, then add polypropylene fiber, silane coupling agent, and water reducer A prepared from pulp waste liquid, and stir for 20-30min Finally, add coagulation water reducer and water, stir for 30-50 minutes, add sodium bicarbonate, and finally add silica fume, and stir for 50-60 minutes to obtain crack-resistant concrete.

Description

technical field [0001] The invention relates to the technical field of building construction, more specifically, it relates to a crack-resistant concrete and a preparation method thereof. Background technique [0002] In recent years, my country's transportation infrastructure has developed rapidly, and a large number of concrete bridges have been built in various places. During the construction and use of bridges, reports about cracks affecting project quality and even bridge collapse are common. Concrete cracks are formed due to factors such as internal stress and external loads of concrete, as well as temperature changes. And if the crack exceeds the range of normal working cracks, it will affect the durability of the structure, and under the influence of load or physical, chemical and other factors, it will reduce the thickness of the concrete protective layer of the steel bar, and it is easy to cause the concrete surface Spalling will accelerate the corrosion of steel ...

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Problems solved by technology

And if the crack exceeds the range of normal working cracks, it will affect the durability of the structure, and under the influence of load or physical, chemical and other factors, it will reduce the thickness of the concrete protective layer of the steel bar, and it is easy to cause the concrete surface Spalling will accelerate the corrosion of steel bars, reduce the frost resistance and durability of concrete, and even cause collapse accidents. Therefore, cracks in concrete must be controlled

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