Construction method of pervious cement concrete

Abstract

The invention provides a construction method of pervious cement concrete. The pervious cement concrete comprises the following materials: cement, gravel, sand, water, a water reducing agent, stone powder or ballast and polypropylene (PP) fiber. The construction method of the pervious cement concrete comprises the following steps: stirring the materials to form a mixture with appropriate dryness-wetness degree; paving the pervious cement concrete by utilizing an asphalt concrete paver for construction and molding; and finally curing the paved and molded pervious cement concrete. The obtained pervious cement concrete is prepared from pervious concrete with sand and takes the PP fiber as a reinforcing agent, thus having the characteristics of high strength, good toughness, good water permeability and good air permeability. In the construction method of the pervious cement concrete, the asphalt concrete paver is adopted for construction without rolling compaction, thus obviously lowering the cost and saving labor hours; and the construction method has the advantages of simple process, high construction planeness, good water permeability, good air permeability and the like.

Description

【Technical field】 [0001] The invention relates to the technical field of concrete, in particular to a permeable cement concrete and a construction method. 【Background technique】 [0002] At present, the surface of modern cities is mostly covered by reinforced concrete buildings and impermeable pavement. Compared with natural soil, ordinary concrete pavement lacks breathability and has poor ability to absorb heat and infiltrate rainwater. A series of environmental problems have been caused. Concrete has always been considered the culprit of destroying nature, but as long as continuous pores are formed, it can create a connection point with the natural environment and greatly change the image of the past. Permeable cement concrete is a creative material for restoring the constantly damaged earth environment because of its honeycomb porous structure. It has characteristics different from ordinary concrete: small bulk density, insignificant capillary phenomenon of water, air per...

AI Technical Summary

Problems solved by technology

[0003] At present, the most common is porous sand-free cement concrete, which has no sand. It uses cement as the cementitious material and ordinary stones as coarse aggregate. It is fully mixed with water and hardened to form a porous and water-permeable material. The disadvantage is that the strength is low, because strength and porosity are a pair of contradictory indicators. The higher the porosity, the lower the strength. When the porosity reaches more than 20%, the strength is generally only 8-13MPa

[0004] Since the permeable cement concrete pavement is made of dry hard cement concrete, the interior of the cement concrete has micro-shaped permeable channels, which must meet both the strength requirements and the water permeability requirements. Therefore, how to pave and roll it has become a technical difficulty in construction. If the molding construction is improper, the problem of insufficient strength or damage to the porous structure will occur, which will cause the permeable cement concrete pavement to lose or weaken the water permeability. At present, the application of permeable cement concrete pavement is still in its infancy, and there is no special application for permeable cement concrete. The machinery for pavement construction generally adopts the existing construction machinery for ordinary cement concrete pavement.

Images