How To Get Quality Output From Your Asphalt Batch Mix Plant

By Author: Milan
Total Articles: 25
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ALL TECH GROUP brings this blog series with the purpose of sharing its long-standing expertise by providing guidance for its readers on the salient objectives that should be kept in mind while operating a typical Asphalt Batch Mix plant. In this two-part series we will be discussing eight major objectives that should be kept in mind while operating a typical Asphalt Batch Mix Plant. Quality-- one goal accomplishing multiple objectives ALL TECH GROUP stresses on relying on quality machinery for quality outcomes; however, with our extensive experience in this sector, we can not stress enough on the need for following certain standard operating procedures while operating any plant machinery. One may have the best plant machinery at his disposal, but if one does not operate it properly, either it the machinery will malfunction or it will not produce the output of a standard and desirable quality.

Ensuring Quality with your Asphalt Batch Mix Plant Dear readers, this is a blog series where we discuss eight major objectives that should be kept in mind while operating a typical Asphalt Batch Mix Plant. Here in Part 1 of the blog ...
... series, we share with you four of them. Watch out for Part 2, to read the remaining. i. Physical Space for plant installation It is really worthwhile to have a clear idea of the physical layout where your batch mix plant will be erected with the view on whether you will be able to ensure appropriate and sufficient space for stockpiling the raw materials and their smooth delivery into the plant at its various entry points or not. We would advise you to avoid the erection and arrangement of your batch mix plant in congested locations where quick and smooth handling of the material might be restricted.
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When the batch mix plant manufacture is facilitated by adequate space for the maintenance of large stock-piles of the raw-materials, experiences tell us that a uniform mix is produced. ii. Feeding of the cold aggregates The aggregates of different sizes are entered into your Asphalt Batch Mix plant through their own separate feeder bins. The aggregates are also referred to as cold aggregates in the process and this stage is also known as 'cold feeding'. It is very important that the plant functioning in this section ensures uniform input of each aggregate size and at the pre-determined speeds.

For a uniform output, one has to give a uniform input. Some points to keep in mind to ensure this are: Ensure there is no mixing or segregation of the aggregates in their respective stockpiles. Feeder gates should be properly calibrated so that they remain free flowing. Due to their size, the fines have the propensity to coalesce into larger sizes. To avoid this, the fines' feeder bin is attached to a vibrator that runs as long as the fines are entering the plant. It is important to note that vibration of the bin beyond its running time will lead to excessive packing of the fines in the bin. To ensure the above, the batch mix plants are furnished with calibrators at the feeder gates.

Your plant operator or the engineer should calibrate the batch mix plant before operating it on the site for work using real aggregates. The calibration process will involve setting the plant to produce the output at the desired rate, of desired consistency, and for pre-determined volume. Asphalt Batch Mix Plant Models iii. Appropriate aggregate moisture content Gradation of the aggregates and their moisture content are regarded by the industry-experts as one of the three most critical aspects to keep in mind when one desires a workable and perfect asphalt mix at the construction site. In fact, moisture content of the aggregates lying in the stock-pile and the feeder bins can vary with the surrounding environment including temperature.
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Moisture content variation in aggregates affects the working in the Drying Drum in the following manner: Energy consumption incurred in the Drying drums will also increase with the increase in moisture content of the aggregates. It may also work inefficiently - sometimes over-drying an already dry aggregate or giving out an insufficiently dry aggregate. Aggregates leaving the drying drum will have varying temperatures due to which the temperature recorded at the Pug-Mill section will be incorrect. iv. Drying drums For efficient operation in the drying drum section of your batch mix plant, it is important that the air that is combined with the fuel for combustion is provided in appropriate amount.

Lack of insufficient air will cause incomplete combustion, leaving an oily coating on the aggregates which will in turn affect the quality of the finished mixture. The flow of air in a drying drum is provided by a blower and maintained by also having an exhaust fan on the other end. To check for oil coating on the aggregates, operators of the batch mix plant often take some of the aggregates coming out of the drying drums by a shovel and put them into a bucket of water. This imbalance of air draft causes 'hack pressure' in the drying drum and puffing back at the burner end.