Steel slag double-layer permeable pavement and production method thereof

Abstract

The invention discloses a steel slag double layer water permeable pavement, which is characterized in that the pavement comprises two layers, wherein, a first layer covers a second layer and comprises the following components according to weight: A. 42.5 ordinary Portland cement: one portion; B. water: 0.25 to 0.35 portions; C. fine steel slag: 4.0 to 7.0 portions, and a diameter of the fine steel slag grain is 1 to 3mm; D. admixture: 1.0 percent to 5.0 percent, and the weight of the cement is taken as the benchmark. The second layer comprises the following components according to weight: a. 42.5 ordinary Portland cement: one portion; b. water: 0.25 to 0.35 portions; c. coarse steel slag: 4.0 to 7.0 portions, and a diameter of the coarse steel slag is 5 to 12mm; d. admixture: 1.0 percent to 5.0 percent, and the weight of the cement is taken as the benchmark. The steel slag double layer water permeable pavement of the invention enjoys a compressive strength in 28 days that is more than or equal to 20 MPa, a bending strength that is more than or equal to 4.5 MPa, and a permeability coefficient that is larger than 1mm / s. In the aspects of bending strength, compressive strength, anti big particle wastes blockage and elegance, the invention is relatively advantageous, compared with a single layer steel slag water permeable concrete pavement.

Description

technical field [0001] The invention relates to a steel slag double-layer permeable pavement and a production method thereof. Background technique [0002] Steel slag is the main industrial solid waste in steel mills, which means that the discharge of steel slag is nearly 60 million tons per year, and the cumulative stacking volume is nearly 200 million tons. The stacking of steel slag occupies valuable urban land and causes a lot of waste of resources. In addition, due to the free calcium oxide contained in the steel slag, the calcium oxide dissolves in the water after a large amount of rainwater washes away, causing the nearby soil to become alkaline, and the pH value of the nearby water area also rises accordingly, seriously polluting the ecological environment of the entire city. The application of steel slag to ecological permeable concrete pavement is a concrete manifestation of "turning waste into treasure", and the use of steel slag as aggregate can give full play t...

AI Technical Summary

Problems solved by technology

At present, the steel slag permeable concrete generally adopts the whole paving single-layer technology. Its main advantages are large void ratio and high water permeability coefficient, but there are also certain disadvantages. Due to the large surface void ratio, it makes: 1) low compressive and flexural strength; 2) A large amount of debris enters the concrete pores with rainwater, which greatly reduces the water permeability of permeable concrete; 3) The aesthetics is not good