Recycled lightweight aggregate pervious concrete and preparation method thereof

Abstract

The invention belongs to the technical field of recycled concrete, and discloses recycled lightweight aggregate pervious concrete and a preparation method thereof. The recycled lightweight aggregate pervious concrete is prepared from, by weight, 800-1000 parts of modified recycled lightweight aggregate, 500-1000 parts of magnetic aggregate, 350-420 parts of cement, 0-50 parts of a mineral admixture, 0.5-1 part of modified plant fine powder, 100-120 parts of water, 0.8-1.2 parts of a polycarboxylic acid type efficient water reducing agent, 15-25 parts of composite fiber and 15-20 parts of graphene oxide powder, wherein the modified recycled lightweight aggregate is obtained by modifying crushed and graded red bricks, foam concrete, aerated concrete and other lightweight aggregates, the modified plant fine powder is obtained by modifying crushed rice straw, wheat straw, corn straw, sawdust and other plant fine powder, and the composite fiber is formed by mixing plant fibers and magnetostrictive fibers. The prepared recycled lightweight aggregate pervious concrete has good strength, percolation, wave absorption and long-term water stability, and can be used as a base layer material tobe applied to road engineering construction of sponge cities.

Description

technical field [0001] The invention belongs to the technical field of recycled concrete, and in particular relates to a recycled lightweight aggregate permeable concrete and a preparation method thereof. Background technique [0002] In response to the increasingly serious urban waterlogging and heat island effect, the country is vigorously promoting the construction of permeable pavement. At the same time, with the advancement of urbanization, a large amount of construction waste is piled up disorderly. For this reason, scholars have begun to use recycled aggregates to prepare permeable concrete. . Lightweight aggregates such as red bricks, foam concrete, and aerated concrete have low strength and large pores, and are prone to pulverization when soaked in water for a long time, so their use is greatly restricted. [0003] A large amount of heavy metal ions and organic matter on the road enter the urban drainage system along with the runoff, polluting urban water sources. ...

AI Technical Summary

Problems solved by technology

Patent CN 109706101 A uses Bacillus sarcina to purify water, but does not involve microorganism fixation, and the purification efficiency and stability are poor

[0004] It is common to use magnets to purify water quality. Patent CN 101830559 A uses the influence of magnetic field on microorganisms to improve the water purification efficiency of ceramic filter materials; patent CN 205867760 U uses permanent magnets to absorb magnetic particles in water, and magnetize and reunite suspended matter in water to precipitate , however, magnets cannot absorb charged ions in water, nor can they magnetize and reunite them, so there are certain limitations

[0005] Magnets are rarely used in the field of concrete. Patent CN 106380164 A adds magnetic aggregates to concrete, which has a good absorption and shielding effect on electromagnetic pulses; patent CN 110156411 A replaces ordinary aggregates with magnetite gravel to improve microwave Deicing efficiency; patent CN 109231951 A adds magnetic powder to concrete and applies an alternating magnetic field to heat the concrete internally, but the eddy current generated by the powder is small and there is a risk of demagnetization

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