Use a rolling brush to coat the cement foundation with one component glue or a uniform undercoat.
⇒ Before the undercoat is solidified, the one-component glue and EPDM particles are proportioned according to the prescribed proportion, fully stirred by a mixer and transported to the paving point. The paver is paved according to the prescribed thickness. After solidification, it becomes an elastic layer.
⇒ Construction of anti-seepage layer: mix two-component mixed runway special paving material A and B according to prescribed proportion, mix evenly, and remember to add appropriate amount of catalyst according to temperature and humidity changes, combine mixed runway special paving material, add appropriate amount of quartz sand to scrape and seal the bottom, wait for its consolidation. Change
⇒ At present, there are two ways of spraying particles and spraying on the anti-skid and wear-resistant surface layer: spraying rubber particles is a batch scraping of composite material with thickness of 2mm on the elastic layer, spraying EPDM or PU rubber particles artificially and evenly, after curing, sweeping away the excess EPDM particles which are not adhering to the surface, and finally spraying a layer of reinforced rubber on it.
⇒ The spraying process is to mix the spraying material with appropriate EPDM particles and spray directly on the surface of the elastic layer with special spraying equipment.
⇒ With polyurethane marking paint, the position of the process line is accurately measured according to the current standards of track and field facilities, and then sprayed.
Brief Introduction of Mixed Plastic Runway.
Mixed plastic runway, also known as traditional bubbles, has a flat and compact structure. Mixed plastic runway is commonly used in professional competition venues. It is a common type of middle and high-grade track and field stadium. Because of its superior physical properties and good appearance quality, it has been recognized by many users. Our company adopts high mixed runway. The two-component mixed runway paving material with good quality and environmental protection can be used for up to 15 years. Because of its excellent physical properties and good appearance quality, it has been recognized by many users. Rubber runway base is divided into cement concrete foundation and asphalt concrete foundation. The smoothness is within 3 meters, the difference between height and height is not more than 3 mm, the pass rate of smoothness is more than 90%, and the inclination is between 3% and 8%. For other technical requirements, please refer to the technical requirements of the construction of the concrete pavement of the second-class highway. Cement concrete foundation has high strength and simple construction, but it needs to deal with waterproof and expansion joints. Asphalt concrete foundation has small shrinkage, good crack resistance and waterproofing performance, high softening point of modified asphalt, and is not easy to reverse oil.
Application Scope of Mixed Plastic Runway.
Mixed plastic runway is commonly used in professional competition venues, which is a common type of high-grade track and field stadium. The cost of construction is much higher than that of breathable plastic runway.
Requirements for Foundation of Mixed Plastic Runway.
Asphalt foundation is recommended for mixed runway, which requires certain strength and stability. Cracks and uneven frost heave caused by freezing cannot occur or will occur. In the frozen area, it is better to add a geotextile buffer layer between the asphalt layer and the gravel layer. The foundation of saltwater trench should be treated with special waterproofing. The thickness of asphalt layer is generally required to be 5 cm coarse asphalt and 3 cm fine asphalt. The smoothness of asphalt layer requires that the error of 3 m ruler is not more than 3 mm. The slope of surface should be 6%-10% from the outer edge of runway to the edge (drainage ditch). It is suggested that 8% should be achieved. After compaction, the density of foundation is over 95%, the compactness of graded gravel layer of subgrade is over 2.3 kg/kg, the depth of heavy rolling wheel track is not more than 5 mm, the surface is flat and solid without sand pit, and plum blossom phenomenon. The compactness of the gravel layer at the base level is over 2.3 kg/kg, and the gravel layer is over 2.14 kg/kg. The surface is firm and smooth, the voids are uniform, and there is no obvious trace of heavy rolling. The compactness of black macadam layer of asphalt concrete is over 97%, the dry capacity is over 2.35 kg/kg, and there is no oil pollution on the surface.No asphalt block without stirring, flat and crack-free.
Construction Technology of Mixed Plastic Runway Mixed plastic runway is laid by three-step construction method.
⇒ Acceptance and acceptance of asphalt foundation, if the surface gap of asphalt foundation is relatively large, the impervious layer foundation should be treated before paving. The impervious layer foundation is made up of two-component mixed runway special paving material A/B component material according to the prescribed proportion, mixing evenly, and remember to add appropriate amount of acceleration according to temperature and humidity changes. Chemicals consist of a special paving compound for mixed runway, in which a suitable amount of quartz sand is added to scrape the bottom and wait for it to solidify.
⇒ When the compactness and clearance of the asphalt foundation meet the requirements, no impervious layer is needed or when the impervious layer is completely solidified, appropriate EPDM particles are added to the mixing uniform mixture in proportion, and the elastic layer with thickness of 8-9 mm is scraped in batches.
⇒ At present, there are two ways of spraying particles and spraying on the anti-skid and wear-resistant surface layer. The spraying process is to scrape the composite material with a thickness of 2mm on the elastic layer by batch. EPDM or PU particles are sprayed artificially and evenly. After curing, the surplus EPDM particles which are not adhered to the surface are swept away. Finally, the spraying process is to spray a layer of reinforced rubber on the elastic layer. Spraying material is stirred evenly by adding appropriate EPDM particles, and sprayed directly on the surface of elastic layer with special purpose.
⇒ Use polyurethane marking paint to accurately measure the position of the process line according to the current standards of track and field facilities, and then spray.
Technical standards and parameters
The physical properties of the mixed plastic runway are generally tested according to the national standard (GB/T14833-93) test methods and procedures. The test items and reference standards are as follows:
⇒ Reference Criteria for Testing Items Standard Test result
⇒ Measurement of thickness (mm)
⇒ Tensile Strength (MPA) > 0.7
⇒ Elongation at break (%) >= 90
⇒ Shaw hardness 45-60
⇒ Compression recovery rate (%) >= 95
⇒ Rebound value (%) >=20
⇒ Flame Retardant (Grade, Flame Spot Diameter ) <=1