Fiber-reinforced recycled aggregate pervious concrete

Abstract

The invention discloses fiber-reinforced recycled aggregate pervious concrete, which is prepared by adopting the following formula: 270-350 kg / m < 3 > of cement, 355-450 kg / m < 3 > of water, 1360-1950 kg / m < 3 > of coarse aggregate, 35-100% of recycled aggregate, 0-30 kg / m < 3 > of polymer emulsion, 0-9.6 kg / m < 3 > of water reducing agent, 0-5 kg / m < 3 > of high-performance admixture, a water-binder ratio of 0.24-0.42, a slurry-bone ratio of 1: 3.8-1: 4.7, the maximum nominal particle size of the coarse aggregate is 5-20 mm, the maximum nominal particle size of the recycled aggregate is 5-20 mm, and the maximum nominal particle size of the recycled aggregate is 5-20 mm. The pervious concrete is prepared from the recycled aggregate, carbon emission in the whole life cycle of ground and pavement paving materials is further reduced, meanwhile, construction waste and solid waste are effectively utilized, the breaking strength and toughness of a pervious paving layer are greatly improved through the fiber reinforcement technology, a premixing mode is adopted for production in a breakthrough mode, the production efficiency is greatly improved, and the production cost is reduced. And the quality stability of a pervious concrete product is ensured to a greater extent.

Description

technical field [0001] The invention relates to the technical field of green and low-carbon environment-friendly building materials, in particular to a fiber-reinforced recycled aggregate permeable concrete. Background technique [0002] Pervious concrete, also known as permeable concrete, permeable concrete, sand-free macroporous concrete (previousconcrete or porous concrete or no-fines concrete), is a kind of concrete that does not contain or contains less fine aggregate and has a high connected porosity ( 15%-30%), larger nominal aperture (2-8mm), and special concrete with a water permeability coefficient of 2-6mm / s. Three basic principles should be followed in the preparation of pervious concrete: coarse aggregate with a narrow particle size range, no or very little fine aggregate, a controlled amount of slurry and usually a low water glue ratio. [0003] According to the main raw materials, pervious concrete can be divided into eight varieties. According to the type of...

AI Technical Summary

Problems solved by technology

[0009] Permeable concrete is mainly suitable for ground and road pavement. It has multiple functions such as drainage, water retention, ventilation, noise reduction, and friction increase. It is one of the basic materials for the construction and operation and maintenance of "sponge cities". It is made of recycled aggregates. Concrete, to further reduce the carbon emissions in the whole life cycle of ground and pavement pavement materials, and effectively utilize construction waste and solid waste at the same time, while the existing fiber-reinforced recycled aggregate permeable concrete forms a permeable pavement layer after paving Due to the existence of the above shortcomings, the production efficiency is greatly reduced, and the quality stability of pervious concrete products cannot be ensured. In addition, recycled aggregates are rarely used in existing working methods, making pervious concrete In the manufacturing process, it is necessary to use more primary aggregates, which cannot save costs and does not have the ability to reduce environmental loads

Images