Mixing and stirring method and device in construction of SBS modified stone mastic asphalt

Abstract

The invention relates to a mixing and stirring method and a device in construction of SBS modified stone mastic asphalt (SMA), enhancing the measuring accuracy. The invention is characterized in that a crusher 1 performs primary crushing on cellulose fiber, the cellulose fiber processed by the primary crushing is conveyed to a batchmeter 3 via a conveying belt 2 connected to the crusher 1, and accurate measurement is carried out by a self decrement scale of the batchmeter 3; the cellulose fiber processed by the secondary crushing and accurate measuring is conveyed to an air blower 6, an air inlet valve 5 and an air outlet valve 8 are opened, a blowback valve 9 and a discharge valve 13 are closed, the air blower 6 is started to blow the cellulose fiber into a measurement storing barrel 11 via a channel 7, after all the measured cellulose fiber is blown into the measurement storing barrel, the air outlet valve is closed, the air inlet valve, the discharge valve and the blowback valve are opened, all the cellulose fiber is sent into an agitating tank to be dryly agitated with the aggregate of coarse aggregate and fine aggregate, and finally mineral powder and asphalt are added to perform wet agitating to produce qualified SMA concrete.

Description

technical field [0001] The invention relates to a mixing method and equipment in highway construction, and is particularly suitable for the mixing method and equipment in SBS modified asphalt mastic macadam construction. Background technique [0002] At present, batch-type asphalt mixture mixers (floors) are used for the mixing of SBS modified asphalt mastic macadam pavement mixtures. At present, the most advanced German Benninghof 5000 asphalt mixture mixers are used. (Building) as the representative of the asphalt mixer, the feeding order of mixing asphalt mastic macadam is: [0003] [0004] The lignin fiber generally adopts time relay timing volume metering, air pressure feeding method or equal packaging one-time adding continuous feeding control, that is, when the coarse and fine aggregates are put in, start timing metering or weigh the set weight of equal packaging The lignin fiber is unpacked and sent to the mixing tank continuously by air. Although the amount of...

AI Technical Summary

Problems solved by technology

Even if the lignin fiber is added while the aggregate is added, the aggregate input time is generally 3-5 seconds, and the remaining 12-15 seconds is purely redundant time for waiting for the lignin fiber. In order to improve the quality of SBS modified asphalt mastic The overall performance of the stone will need to wait for the addition of lignin to complete, and then start spraying asphalt and wet mixing after fully stirring; generally, each plate of asphalt mastic macadam mixture waits for lignin fiber addition for 12 to 15 seconds, up to 75 Seconds or 1.25 minutes to mix a plate of mixture, which reduces the production efficiency. Generally, in order to improve the asphalt mixture mixer (floor), the method is to reduce the dry mixing time or use two lignin fiber conveyors to transport in parallel, which reduces the production efficiency. The overall performance of SBS modified asphalt mastic macadam increases the construction cost and affects the continuity of the mixture construction, thus affecting the stability of the pavement quality

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