A kind of anti-compression anti-carbonation recycled concrete and its preparation method

Abstract

The invention discloses a compression-resistant and carbonation-resistant recycled concrete and a preparation method thereof, belonging to the technical field of concrete. Concrete raw materials include 250-290 parts of cement, 55-70 parts of silica fume, 30-45 parts of fly ash, 1050-1120 parts of modified recycled coarse aggregate, 700-730 parts of sand, and 10-15 parts of redispersible latex powder 3-5 parts of water reducing agent, 140-160 parts of water. Preparation of modified recycled coarse aggregate: 100 parts of water glass with a mass concentration of 5%, 20-30 parts of diatomaceous earth, 10-20 parts of zeolite powder, 8-15 parts of colloidal graphite powder, 1-15 parts of silane coupling agent Mix 3 parts evenly to obtain aggregate modification solution, soak the recycled coarse aggregate raw material in it, drain, and roast at 180-200°C for 1-2h. Preparation of concrete: Prepare modified recycled coarse aggregate; mix cement, sand, redispersible latex powder, and water evenly, add modified recycled coarse aggregate and mix evenly, add water reducing agent, silica fume and fly ash and mix evenly . All the concrete of the invention adopts the modified recycled coarse aggregate as the coarse aggregate, and the final prepared concrete has the characteristics of compression resistance and carbonation resistance.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a compression-resistant and carbonation-resistant recycled concrete and a preparation method thereof. Background technique [0002] Concrete has a wide range of needs and applications in construction engineering, and since the volume of aggregate in concrete accounts for 60-70%, the demand for aggregate in construction engineering is huge. [0003] The natural aggregate is natural sandstone. However, the long-term exploitation of natural sand and gravel resources is likely to cause problems such as the destruction of mountain vegetation and river channel damage. Furthermore, with the development of urbanization and the renovation and reconstruction of houses and other buildings, a large amount of waste concrete construction waste is produced, and the arbitrary stacking of waste concrete construction waste has also brought ecological problems such as environmental degradation. ...

AI Technical Summary

Problems solved by technology

Concrete made of recycled aggregate has the defects of low compressive strength and low carbonation resistance

The reason is that the recycled aggregate contains the original aggregate, and the original aggregate is partially or completely covered with old mortar. The surface and interior of the original aggregate and the old mortar have a large number of interconnected pores, which not only seriously reduce the concrete compressive strength, but also as CO 2 Gas permeation channels aggravate the carbonation of concrete

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