Preparation And Properties Of Porous Concrete Material

Subsurface Irrigation is a new and efficient water-saving irrigation techniques significantly, subsurface irrigation technology has long been proposed, but the subject material manufacturing technology, long-term theoretical arguments and experimental exploration stage. With respect to the organic plastic material, it is a typical microporous ceramic inorganic material, the ceramic material-specific physical and chemical properties, the use of porous ceramic emitter prepared to meet the various performance requirements Subirrigation. However, the preparation of porous ceramic emitter must pass through the high-temperature sintering, greatly increasing the manufacturing cost of irrigation, subsurface irrigation hindered the further development of technology. Porous concrete and porous ceramics belong to the inorganic material, having almost the same physical and chemical properties, the use of a suitable preparation process, the concrete has a porous microstructure, while having excellent physical, mechanical and hydraulic performance, you can use as ooze emitter. From the start of basic research materials science, focusing on exploring the process of normalization of porous concrete preparation for subsurface irrigation emitters and porous concrete Porous Pipe, and then by the mechanical properties of concrete irrigation system’s hydraulic performance and irrigation mechanism to further optimize porous concrete material formulation emitter ooze tube. We made the following main conclusions:(1) concrete pores open porosity and an average pore size changes by the particle size of sand and cement content in lead, is the leading cause emitter flow rate variation. Overall, the cement content on the porous concrete irrigation flow rate is large, with the increase of cement content, emitter flow significantly reduced, and for the same cement content of the concrete pore emitters, along with sand particle size decreased emitter flow will be reduced, but reduced slightly. When the cement content of 12%, the emitter of the larger flow, but the emitter of insufficient strength, poor reliability, and failure prone to damage in the actual process of irrigation. When the cement content of 21%, the higher the intensity of irrigation, better reliability, but the irrigation flow is too small, the head must be higher in order to achieve the desired effect of irrigation. When the cement mass fraction of 15% to 18%, the emitter has a high strength, moderate and open porosity and an average pore size in the actual irrigation can be both reliability and flow requirements emitter.(2) sand particle size, water-cement ratio of the density of the porous concrete Porous Pipe, open porosity and flow greater impact. With sand particle size decreases, its density decreases open porosity increases. The actual preparation process in order to achieve greater open porosity and density, should preferably sand(particle size range of 0.6 ~ 1.0 mm). With increasing pressure head, the flow of cement-based porous Porous Pipe gradually increases. Cement content is higher, the slower the change in amplitude. After the flow test, 22.9% of the cement content of the cement-based porous subsurface irrigation tubes can be used for follow-up study.(3) add a greater impact on diatomite porous concrete Infiltration density, open porosity, bending strength, microstructure and flow. For sand, the addition of diatomite can effectively improve their internal pore structure, the greater the diatomite dosage, the greater its open porosity. With the diatomaceous earth content increased from 4-10%, flexural strength seepage pipe fell by 0.95 MPa to 0.38 MPa. With increasing pressure head, cement-based porous Porous Pipe flow are increased; the greater the pressure head, the greater the cement-based porous Porous Pipe flow. Meanwhile, with the increasing content of diatomite, under the same head, flow Infiltration of porous concrete is gradually increasing. In order to cement-based porous Infiltration can be lower under pressure to use, you should use the larger flow of low pressure cement-based porous Infiltration therefore recommended the use of sand(particle size range of 0.6 ~ 1.0 mm), Celite content of 7% of the porous concrete Infiltration.