Pervious concrete special-purpose additive and use thereof

Abstract

The invention discloses a pervious concrete special-purpose additive and a use thereof. The pervious concrete special-purpose additive comprises, by mass, 10-20% of a polycarboxylic acid water reducer, 5-25% of a polycarboxylic acid slump retaining agent, 0.5-3% of a water-retaining agent, 0.5-5% of a thickening agent, 1-5% of a delayed coagulant and 52-75% of water. A mass ratio of the additive to the gelling material in the pervious concrete is 1-2%. Ingredients of the pervious concrete special-purpose additive produce good synergism. The pervious concrete special-purpose additive guarantees water permeability, well keeps pervious concrete workability for 2h or more, improves strength after aging and realizes pervious concrete premixing production.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, 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] Permeable concrete has good water permeability, high water storage capacity and good decoration. It is a new type of material worth promoting in the construction of "sponge city". Permeable concrete is not mixed with fine aggregate, and is made by mixing cementitious material, coarse aggregate, admixture...

AI Technical Summary

Problems solved by technology

Problems of pervious concrete in long-distance transportation: pervious concrete is porous during stacking and transportation and construction, and there is a large amount of water evaporation inside and on the surface, and the water loss is fast; the loss of the working performance of the slurry itself during the transportation process; the transportation process Slurry sinking caused by turbulence in

Solving the above problems requires special admixtures to adjust, but currently there is no special admixture for permeable concrete that can reduce water evaporation and improve work performance.

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