The sampling of asphalt mixing plant mixture: sampling methods is correct or not directly affect the accuracy of test results. Tests showed that due to incorrect sampling caused by asphalt content deviation up to 0.3% , while the measurement accuracy specifications asphalt was 0.1% , if not ensure minimum sampling deviation, the test results are not credible. Mixture sampling can be adopted Sampling spoon sampling directly under Stirring the pot or used shovel sampling on the truck. Sampling on the truck with shovel should take the mix stack 1 / 3 ( located below ) , spade depth 30cm, and take the same position on each truck. sample mix well with quartering analyze samples. The best way is sampling with the sampling spoon directly under the mix pot, sampling spoon capacity consistent with the extraction instrument basically for 2.5 kg or so , after removed the material sample, Calibrating the higher sampling than the sampling spoon with plate, inside the spoon -like material is analyzed sample.
Asphalt cubage determine: after taken over material samples into 110 ℃ Drying box roasted for 30 min weighed immediately, then soaked 30 mim with trichlorethylene then extraction. Determination of bitumen cubage by combustion is a fast and accurate method, but due to the device is higher prices, the application is still widespread currently in construction enterprises, most still use centrifugal extraction instrument. When used Centrifugal extraction apparatus extraction, should be noted that the first wash pot and keep all materials like container extraction mixture washed into the pot, add the filter paper after wiping Guobian residue as possible tighten the lid. Extracted twice, the second soak time about 10 min. For a small amount of powder of solvent trichlorethylene, using a centrifuge to separate: divided into solution four equal parts, into the 4 cup of centrifuge. Pour the solution should pay attention to the slag at container bottom flash into the centrifuge cup. Cover centrifuge lid, start the centrifuge, and gradually improve speed, in 3500 r / min of speed , running 10min, the cup was drained, after slag dried at the bottom of the cup with a knife scraped , with the powder into a container of known weight , oven drying about 30-60min at a temperature of 110 ℃. after drying Pour the drying aggregates from the drying box immediately together weighing; calculated asphalt cubage asphalt mixture by conventional methods.
Conclusion: For the asphalt mixing equipment debugging process, including the commissioning of each system and the adjustment of parameters , the purpose: (a) ensure that bitumen, mineral powder ( filler ) , aggregate calculation accuracy , thus ensuring the quality mix stability. (b) in the asphalt mixture , the biggest impact on performance is mix asphalt cubage, followed by ore and fine aggregate. The more fine material, the calculation accuracy is higher. (c) the correct sampling methods and experimental techniques, is an important guarantee for the accuracy of the test data .
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