There are stones, cement, water, SR permeable concrete reinforcing agent and permeable concrete surface covering agent in the foundation sand of park roads. In the process of permeable concrete construction, a certain amount of stones, cement, reinforcing agent and water are put into stirring, and then stirred evenly, and then transported to the construction site by a hopper car. Before paving, the subgrade should be kept wet.

The cushion should be vibrated and leveled, and the surface should be leveled with cement trowel. After the construction is completed, it needs to be covered with agricultural film for maintenance. It will be watered and maintained in two days. During the maintenance period, isolation belts should be set up to prevent pedestrians from passing through. Curing for five to seven days, and spraying surface sealant after the surface layer is dried.

Other uses of gravel

Gravel is a kind of building material, which is often mixed with sand, cement and other building materials in a certain proportion, and can be made into concrete after mixing.

Paved on railway subgrade can be used as ballast.

Grab the game props in the stone.

There are granite, limestone, quartzite and composite silicates with different compositions. Structurally, there are magmatic rocks, sedimentary rocks, metamorphic rocks, and then river transport, and the proportion of each place is different.

Cement powder hydraulic inorganic cementing material. Mud can be hardened in air or water after being mixed with water, and can firmly bond sand, stone and other materials together.

The mixture of early lime and pozzolan is very similar to modern lime-pozzolan cement. After hardening, the concrete made of crushed stone not only has high strength, but also can resist the erosion of fresh water or salt water. For a long time, as an important cementing material, it has been widely used in civil engineering, water conservancy, national defense and other projects. In the past, cement was also called cement.