At present, ecological imbalance exists in most areas. In the process of pursuing economic development, how to protect the environment and restore the ecology is an important task in the 21st century, and it is also a key problem that we all pay close attention to and strive to solve.
In order to reduce the environmental load and improve the ecological environment, the porous planting concrete has been tested and studied for decades at home and abroad. Porous plant growing concrete is an ecological concrete with special pore structure and surface characteristics prepared by special technology, which has good ecological and economic benefits. In addition, porous vegetation, concrete can be used for slope protection, pavement, roof garden and other buildings, with good anti scouring, flood control and ecological restoration functions. It has the advantages of purifying water quality and improving landscape as well.
In this study, the physical and mechanical properties of porous plant growing concrete were analyzed, and the influence of latex on the compressive strength, flexural tensile strength, water permeability, porosity and planting performance of porous plant growing concrete was analyzed. The results shows that:
1) The porosity, permeability coefficient, compressive strength and other properties of porous plant growing concrete affect each other. The greater the porosity of porous plant growing concrete is, the permeability coefficient increases correspondingly, while the compressive strength decreases. Porosity is the key factor determining the permeability and compressive strength of porous plant growing concrete.
2) The amount of latex can affect the strength of porous plant growing concrete. Based on the determination of the compressive strength of porous plant growth concrete with 0%, 1%, 2%, 3%, 4%, 5% and 7%, the compressive strength reaches the maximum when the latex content is 3%.
3) According to the influence law of various factors, the optimized mix ratio design is proposed. The coarse aggregate adopts 13-20mm particle size and the latex placement ratio is 3%, which can produce a compressive strength greater than 6MPa and a porosity greater than 25%. Porous planted concrete with a permeability coefficient greater than 1.80 cm/sec.
4) The Compressive strength is the main factor that determines the frost resistance of porous planted concrete. The specimens with high compressive strength have better frost resistance, and the specimens with low compressive strength have poor frost resistance.
5) After comparing the plant growth performance of the porous planted concrete with latex and the plant growth performance of the porous planted concrete without latex, it is found that the experiment with latex (No.8) is generally longer than that without latex. The experimental group (No.5) had an average increase of about 8.7% (refer to Table 14), indicating that the porous planted concrete with latex is more conducive to the growth of plants.