As for the stadium asphalt concrete base course, it is necessary to check the operation of each part and the quality of each part of the material at any time during the construction process. When conditions are met, the mix ratio of asphalt concrete, especially the ratio of oil to stone, etc., must also be inspected in order to achieve better results. The quality of the plastic surface can be guaranteed, ignoring the all-round inspection of the construction process, it is likely to lay hidden dangers to the project, causing undue losses. The partial deviations of the inspection are shown in the table below.
Asphalt Concrete Base Course Construction Inspection
Grassroots Types of | Items | Frequency of inspection | Quality requirements or tolerances | experiment method | ||
Hot mix asphalt base | Exterior | Simultaneous inspection of each operation | Smooth and dense surface, no wheel marks, cracks, pushing, oil, segregation, white material phenomenon | Visual inspection | ||
seam | Check at any time | Solid, smooth and straight | Visual inspection, ruler measurement | |||
Hot mix asphalt base | Construction temperature | Factory temperature | 1 time | 140~160°C | With a thermometer | |
Paving temperature | 1 time | 120~150°C | ||||
Rolling temperature | Check at any time | Not less than 110°C | ||||
Final rolling temperature | at any time | Not lower than 65°C | ||||
Mineral gradation and standard grade | 1 to 2 times for each mixer (per shift) | Sampling in the mixing plant, medium-sized to 9.5mm, coarse-grained to 13.2mm | ||||
Square sieve | Round sieve | |||||
0.075mm | 0.075mm | ±2% | ||||
≤ 2.36mm | ≤ 2.5mm | ±(6%~7%) | ||||
≥4.75mm | ≥5.0mm | ± (7% to 8%) | ||||
Asphalt usage (Wheel ratio) | Each mixing machine 1~2 times/day | ±0.3%~±0.5% | The mixing plant takes centrifugal extraction | |||
Marshall test | 1 to 2 times per machine (per shift) | Asphalt Concrete Type I, Sample Mixing Plant | ||||
Stable number (KN) | ||||||
Flow value (0.1mm) | ||||||
Density, porosity% | ||||||
Water immersed Marshall test | when necessary | See note | Mixing plant sampling | |||
compactness | 4000m2 take one | 95% Drilling Density of Marshall Test Density 99% | On-site sampling, nuclear density meter check at any time | |||
Structure thickness | 4000m2 take one | Meet design requirements | Site sampling | |||
Note: 1. When asphalt mortar gravel mixture immersed in 60 °C water that occurs loose, Marshall test may not be performed, other density, porosity, asphalt saturation and other indicators to detect;
2. The voidage asphalt gravel deviation is >10;
3. Asphalt saturation Asphalt gravel is 40~60.
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