一, What are the differences between pervious concrete and ordinary concrete
Concrete is a commonly used building materials, with the development of building materials, pervious concrete as a new type of concrete is also widely used, then pervious concrete and ordinary concrete compared, what is the difference between the two?
- Material difference
Common concrete materials are cement, stone, sand, water. The material of pervious concrete is mainly cement, stone, water, cementing agent, do not need sand, if it is color pervious concrete also need toner and protective agent, if it is self-luminous pervious concrete also need to add luminous stone.
- Performance difference
Ordinary concrete has super durability, but it can not be permeable, and a large number of paving has a great impact on the ecological environment. The durability of pervious concrete is about 8-15 years, but it can be permeable and breathable. When it rains, the ground rainwater can naturally flow into the soil layer, which makes better use of the natural rainfall to provide water resources for the surrounding plants. At the same time, the underground gas can be released in high temperature, which has a certain cooling effect.
3, strength difference
The strength of ordinary concrete is higher, and steel bars can be added to strengthen the strength; And pervious concrete because it has many pores to achieve the function of pervious, so the strength is relatively low, and can not use sand (sand will cause pore blockage), can not be added to the reinforcement (cementing agent and iron is not compatible), so for now, at most can only provide lightweight car driving.
- Construction differences
Ordinary concrete can be mixed by mixing station and then transported to the construction site. Pervious concrete must be stirred on site, because the cementing agent is added and does not contain sand, so its setting time is much faster, and generally it takes 30 minutes to finish the spreading.
- Color difference
The color of ordinary concrete is a single gray; Pervious concrete is also known as colored concrete, because it can optimize the color of the concrete, and the color is richer.
- Price difference
Due to the different raw materials and construction of pervious concrete, the general price of pervious concrete is higher than that of ordinary concrete, but when constructing pavement, because pervious concrete does not need road arch and drainage measures, the total cost is not necessarily higher.
To sum up, there is still a big difference between pervious concrete and ordinary concrete, and we mainly choose the appropriate concrete according to the construction needs and the field of use.
Second, can permeable concrete replace ordinary concrete
Compared with ordinary concrete, pervious concrete turns the original hard concrete into "breathing" concrete, which has good pervious performance and decorative effect. As a new type of eco-friendly material for urban development, can pervious concrete replace ordinary concrete?
Relatively speaking, although the performance of pervious concrete has certain advantages, but due to technical limitations, the strength is relatively low compared to ordinary concrete (can only reach C15-C30), in some areas with high bearing requirements, such as highways, pervious concrete can not replace ordinary concrete. However, in urban areas, such as sidewalks, parking lots, non-motorized roads, etc., pervious concrete can replace ordinary concrete.
