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The importance of ground base for the PU running track
May 08, 2018

Quality requirements of PU runway for cement concrete

 

1. Natural soil layer: The density is more than 95% and the moisture content is 8-12%. After removing the turf and humus soil, use 8-12 tons of roller compactor to roll from the two sides to the middle 5-8 times.

 

2. Natural sand and gravel layer: The thickness is about 150mm, the maximum particle size does not exceed 2/3 of the thickness of the bottom layer, the aggregate content is 60%, and it is rolled with 8-12 tons of roller compactor for 5-8 times.

 

3, gravel cushion: the thickness of about 100mm, (particle size 30-60mm), with 8-12 tons of roller compactor to gravel is not loose, the surface without corrugated so far, the compaction density of 2.2 tons / cubic meter .

 

4. Water-repellent layer: Use poly-absorption film or pvc thickened water-proof film to be waterproofed. The overlapping area should be greater than 200mm, and the margin is greater than 150mm.

 

5, cement concrete soil layer:

 

1) The overall laying of cement concrete above c25 should be adopted, and the surface mortar 1:1

 

2) After the flat plate is vibrated, the wooden box is used to pull the wool during the cement collection, so that the plastic bonding is more secure.

 

3) After the cement is solidified, 4-5m interval expansion joint (width 8-10mm, depth 30-40mm)

 

4) The thickness of cement concrete is about 100mm. Quality requirements

 

1. After the foundation is completed, the cement surface shall not be too smooth and there shall be no phenomena such as sanding, shelling, peeling and cracking.

 

2, flatness: 3m ruler tolerance within 3mm. 3, slope: in line with sports process indicators.

 

4, compressive strength: R20> 25kg / square centimeter R50> 10kg / square centimeter.

 

5, the basic surface without water phenomenon.

 

6, the maintenance period: 28 days or more (with alkaline components in volatile cement, watering during the maintenance period)

 

7. Before the plastic layer is laid, the base layer should be free from oil and ash-free.

 

Plastic Runway Requirements for Asphalt Concrete Quality

 

1. Natural soil layer: The density is more than 95% and the moisture content is 8-12%. After removing the turf and humus soil, use 8-12 tons of roller compactor to roll from the two sides to the middle 5-8 times.

 

2. Natural sand and gravel layer: the thickness is about 150mm, the maximum particle size does not exceed the thickness of the bottom layer by 2/3, and the aggregate content is 60%. It is suitable to use 8-12 tons of roller compactor for rolling 5-8 times.

 

3, gravel cushion: the thickness of about 100mm, (particle size 30-60mm), with 8-12 tons of roller compactor to gravel is not loose, the surface without corrugated so far, the compaction density of 2.2 tons / cubic meter .

 

4. Asphalt concrete layer: The first layer of crude asphalt is paved, the thickness is 40-60mm, the particle size of the gravel is 6-9mm, the oil content is 4.6% to 5.8%, and the asphalt layer is thinned after rolling with 8-12 tons of roller compactor. 20-40mm, gravel particle size of 2-5mm, content of 5.8-6.4%, with 6-12 tons roller compactor.

 

5, matters needing attention:

 

1) The asphalt paving temperature should be above 100°C, and the survival temperature should be above 60°C.

 

2) Roller roller should be cleaned with clean water, avoid using diesel or other heavy oil scrubbing to ensure the adhesion of asphalt layer and plastic.

 

Quality requirements

 

1. There must be no cracks on the foundation surface, no obvious rolling wheel marks, no oil, grease and unstirred asphalt blocks, no induration, sinking, cracking, honeycombing or peeling.

 

2. There is no water blocking phenomenon on the surface of the foundation.

 

3. Flatness: The passing rate of flatness is above 95%, and the allowable error of 3m ruler is within 3mm.

 

4, slope: in line with sports process indicators.

 

5, compressive strength: R20 is greater than 25kg/cm2, R50> 10kg/cm2.

 

6. Density: The surface compaction density is over 97%, and the dry capacity is 2.35kg/liter or more.

 

7, asphalt softening point> 50 °C, extension 60cm, penetration 1/10mm> 60.

 

8, asphalt thermal stability factor: kt = R20/R50 3.5.

 

9, body expansion rate: <1%

 

10, water absorption: 6-10%

 

11, maintenance period: more than 15 days

 

12. Before laying the plastic layer, wash the basic surface with water first to ensure that the foundation layer should be dry, oil-free and ash-free when laying.