Specialadmixture for pervious concrete and application ofspecialadmixture

Abstract

The invention discloses a specialadmixture for pervious concrete and application of the specialadmixture. Thespecial admixture comprises the following materials in weight percent: 5 to 15 percent (solid content) of a water reducing agent; 0.1 to 1 percent of a retarder; 0.1 to 1 percent of a thickener; 15 to 25 percent of an early strength agent; 25 to 50 percent of a water-repellent agent; 25 to 50 percent of rubber powder. The admixture overcomes the problem that the existing pervious concrete is not easy to transport bya tanker, and ensures that the phenomenon of blocking cannot occur when the pervious concrete is put into a tanker after the admixture is used, has excellent service behavior after the pervious concrete is discharged from the tanker, and has excellent cohesiveness, without phenomena of bottom sealing and hole blocking.

Description

technical field [0001] The invention relates to an admixture for concrete and its application field, in particular to a special admixture for permeable concrete and its application. Background technique [0002] "Sponge city" is an important direction for the development of new urbanization in the "13th Five-Year Plan". The construction of "sponge city" with natural accumulation, natural infiltration and natural purification will effectively solve the problem of waterlogging and water shortage in some cities, which will help improve the urban ecological environment and increase social benefits, which is an urgent need for new urbanization construction. [0003] Pervious concrete (Pervious Concrete) is a porous concrete with continuous pores made by a special process of specific gradation of aggregate, cement, water, admixtures and admixtures. Its apparent density is generally 1600~2100kg / m3, 28d compressive strength is 10~40MPa, flexural strength is 2~7MPa, water permeabili...

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Problems solved by technology

[0005] Therefore, in order to solve the above-mentioned deficiencies, the present invention provides a special admixture for permeable concrete and its application; to overcome the problem that the existing permeable concrete is not easy to be transported by tank truck, after using the admixture, the permeable concrete can be put into the tank without In the event of clogging, it can have good working performance after being out of the tanker, and has good cohesiveness, without bottom sealing and hole blocking

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