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The Paving Temperature of Asphalt Mixture

The paving temperature of asphalt concrete should be adjusted according to the ambient temperature changes. Generally, the normal construction temperature should be controlled at no lower than 110-130℃, while not exceeding 165℃. Below precautions for asphalt concrete paving:1. Inspect the lower supporting layer.2. Confirm the mix ratio of asphalt mixture, including determining the mix proportion of aggregate and the amount of asphalt.3. Use intermittent mixer for asphalt mixing.4. Transport asphalt with waterproof, heat preservation, and anti-adhesion measures.5. Pave at a temperature of no lower than 110 -130℃. Work with two to three pavers for continuously and evenly paving.6. Roll with 2-3 rollers. The temperature after rolling should be no lower than 65℃. The rolling process consist of initial rolling, secondary rolling, and final rolling. Use mist spraying to prevent sticking.7. When spraying water on the roller during construction, pay attention to controlling the amount of spraying to prevent the dropping of mixture temperature. Use a mist sprayer. At the joint of the mixture or where hot and cold materials overlap, adopt cross-joint rolling.8. Conduct inspections all the time during construction.9. Open traffic when the temperature drops to 65℃ after rolling.10. Do not use unqualified raw materials for road construction. Enhance the testing of mixture ratios with strict on-site inspection and indoor testing. This includes temperature testing and recording at the mixing plant and construction site, which contains but not limited to Marshall tests, extraction tests at specified frequencies, pavement dimension records, as well as the testing of pavement thickness, compaction, and flatness.11. Strengthen the management and analysis of inspection data to ensure engineering quality. This includes the condition of the stockyard, daily mixing records, daily construction site records, determination and feedback of inspection data, daily engineering quality indicator charts, dynamic analysis of engineering quality and more.12. Set up clear signages for the initial rolling, secondary rolling, and final rolling sections so that it would be easier for drivers to recognize. Dedicated positions should be set up to inspect the loose paving thickness, rolling order, rolling times, rolling speed, and rolling temperature.13. Strictly control the rolling temperature and times to prevent over-rolling, or it may result in too high density or too low void content. Apart from above, a reliable asphalt mixing plant and crushing equipment are also of great importance to the good paving. With rich experience and leading technology in the road construction industry, D&G Machinery is dedicated to provide you with customized solutions. If you need any help, do not hesitate to contact us.

Precautions for Asphalt Pavement Construction in Winter

For asphalt pavement construction in winter, we need to follow a series of precautions. These suggestions not only meet market requirements, but also help ensure construction quality and extend the service life of roads. 1. Temperature monitoring and management1) Ensure that the temperature of the air and bitumen is within the allowable range of the engineering specifications. Usually, the air temperature should be higher than 5℃, and the factory temperature of the asphalt mixture should not be lower than 150℃.2) Use insulation facilities such as heaters or insulation materials to maintain the temperature of the mixing equipment. 2. Material selection and storage1) Use asphalt mixture that has been specially treated or modified with additives to enhance its performance under low temperature conditions.2) Ensure that all construction materials such as bitumen and aggregate are properly insulated and stored in a dry, well-ventilated area. 3. Construction time planning1) Choose a time of day with higher temperatures for construction, avoiding the cold period after sunset.2) Shorten the construction period and reduce the exposure time of materials at low temperatures. 4. Mixing and transportation1) During the mixing process, make sure to mix evenly at a proper temperature.2) Tidy up the carriage before loading. During transportation, prevent the mixture from sticking to the bottom of the carriage, which should be coated with anti-adhesive or release agent.3) Ensure that the mixture is not affected by sudden braking, sharp turns, or bumps during transportation. 5. Paving and rolling1) Use a vibratory tamper with a high frequency to ensure that the density meets the requirements.2) Use a small-tonnage roller for initial rolling, avoiding the use of rubber-tired rollers.3) Avoid opening the traffic before the road temperature drops to 50℃. 6. Quality inspection and control1) Conduct more Marshall tests for molding and ensure their authenticity and reliability.2) Carry out more on-site drill core samplings and ensure their quality, focusing on inspecting indicators such as the density and porosity of the asphalt mixture. 7. Safety and environmental protection1) Check mechanical equipment regularly to ensure its normal operation, and strengthen safety management on the construction site.2) Set up obvious safety warning signs and safety protection facilities.3) Control the emission of construction noise, wastewater and exhaust gas, so as to minimize the impact on the surrounding environment. 8. Other precautions:1) Strengthen the connection with local meteorological department, in order to understand the weather changes and take measures in a timely manner.2) Pay attention to the temperature change of the mixture to prevent abnormalities.3) Enhance the management and supervision of the construction site to ensure the effective implementation of various measures.4) Strengthen communication and coordination with relevant government agencies to ensure smooth construction.  In conclusion, the construction of asphalt pavement in winter calls for special attention to issues such as quality, safety, and environmental protection. Bearing the suggestions in mind, it is possible to effectively complete the task of asphalt pavement construction under severe winter conditions.

Routine Maintenance of Asphalt Mixing Plant

The maintenance of asphalt mixing plant plays a vital role in ensuring the normal operation of the equipment and extending the service life. Below some key points for maintenance of asphalt mixing plants:   1. Daily Inspection: Regularly inspect various parts of the equipment, including mixing tank, vibrating screens, conveyor belts, dust collectors, to make sure the normal operation and less damage.   2. Cleaning and Maintenance: Clean the equipment on a regular basis, remove accumulated asphalt and debris to keep the equipment clean and hygienic. Pay special attention to the dust collector cleaning to ensure it is working properly.   3. Lubrication Maintenance: Regularly add lubricating oil or grease to the lubricating parts of the equipment to make sure the normal operation of the friction parts of the equipment and prevent damage caused by friction.   4. Regular Maintenance: Conduct comprehensive maintenance of the equipment on a regular basis, including checking and replacing wearing parts, adjusting the working parameters of the equipment, and ensuring the performance and accuracy of the equipment.   5. Safety Inspection: Carry out regular safety inspections to ensure the safe operation of the equipment. Check the electrical system, pneumatic system, hydraulic system, etc. to guarantee their normal operation, safety and reliability.   6. Train and cultivate maintenance personnel: Ensure that equipment maintenance personnel have the necessary skills and knowledge to operate and maintain the equipment correctly.

Asphalt Mixing Plant Staffing

Asphalt mixing plant staffing varies depending on the size and operational needs of the site. Generally speaking, the following types of personnel are required:   1. Plant Manager: Responsible for the daily management and operational decision-making of the entire asphalt mixing plant. 2. Operator: Responsible for the equipment operation and control of the asphalt mixing plant, relevant operating certificates are needed. 3.Maintenance Personnel: Responsible for equipment maintenance and fault repair of asphalt mixing plant, relevant work experience and skills required. 4. Safety Management Personnel: Responsible for the safety management and safety training of asphalt mixing plants, a good understanding of relevant safety regulations and operating procedures required. 5.Quality Inspectors: Responsible for product quality inspection and supervision of asphalt mixing plants, need to have relevant quality control knowledge and skills. 6. Purchasing and warehouse management personnel: Responsible for material procurement and warehouse management of asphalt mixing plants, need to master relevant logistics and material management knowledge.   Other relevant personnel can also be arranged as per actual needs, such as mechanic, material manager, canteen staff. When selecting personnel, it is necessary to select personnel with corresponding abilities and qualifications based on job responsibilities and requirements to ensure the normal operation and management of the asphalt mixing plant.

The Stability and Durability of Asphalt Pavement

Asphalt pavement has high temperature stability and low temperature crack resistance with good water stability. These characteristics make asphalt pavement less likely to flow and deform at high temperatures in summer, and less possible to crack at low temperatures in winter, while against moisture damage.  Asphalt pavement tends to be stable in summer mainly because of its ability to resist flow deformation. In hot seasons, due to repeated vehicle driving, asphalt pavement may suffer from waves, drifts, rutting, congestion and other damages. However, the high-temperature stability of asphalt pavement makes it less susceptible.As for low-temperature crack resistance, this means that asphalt pavement is less likely to crack, sink, and dent when the temperature drops. Since the stiffness of asphalt pavement increases and the deformation capacity decreases as the temperature drops, under the action of external loads, part of the stress has no time to release, and stress may accumulate instead, preventing the pavement from cracking, sinking, and denting. Asphalt pavement also has good water stability. Even in rainy seasons or rainy areas, moisture is less likely to penetrate and damage the pavement structure, keeping the pavement stable.   In general, asphalt pavement is stable with a long lifespan thanks to its excellent high temperature stability, low temperature crack resistance and water stability. These properties allow asphalt pavements to withstand a variety of climatic conditions, traffic pressures and still remain in good condition. It is necessary to conduct proper maintenance so as to keep up with the good work.   D&G Machinery provides clients with efficient and reliable asphalt mixing plants in various configurations, which can meet the requirements of asphalt pavement in different projects. For more information and customized solutions, please do not hesitate to contact us.

How to reduce cost and increase efficiency for asphalt plant operation?

Regarding asphalt mixing plant operation, the cost can be cut while the efficiency lifted with the following measures:   1. Equipment System Retrofitting: Retrofit the equipment system to reduce operating costs. For example, the combustion system can be transformed into a low-pressure atomized heavy oil combustion system to improve fuel utilization and reduce fuel costs. In addition, the modification of thermal oil heating can also reduce operating costs. 2. Stockyard Management: Plan the stockyard properly to cut transportation costs. Choose appropriate raw material suppliers to ensure the quality and supply stability of raw materials. 3. Production Management: Formulate reasonable production plans to reduce equipment idling time and energy consumption. Strengthen the daily maintenance of equipment so as to extend its service life and cut maintenance expenses. 4. Upgrade Product Design: The updated product design would bring about less raw material (sand, stone etc.) waste, lower production costs, with product quality and competitiveness lifted. 5. Enhance Operator Skills: Provide operators with more training to enhance their equipment operating and maintenance skills, so as to reduce equipment failures and accidents while improving production efficiency.  6. Introduce New Technologies: Introducing new technologies and equipment would result in higher production efficiency and product quality, as well as lower production costs.

How to Control Dust for Asphalt Mixing Plant?

In response to the dust problem arisen from the daily operation of asphalt mixing plant, the following measures can be considered:Install dust collection equipment: Install dust collection hood at the discharge port of the mixer. The hood is semi-closed, which can significantly reduce the overflow of asphalt smoke.  Dust collection devices can also be installed in other equipment and areas that may generate dust, such as cold feeders and belt conveyors.Water spraying: Use a water spraying system to reduce dust during  mixing. As for this system, nuzzles can be installed at appropriate locations to spray water mist, suppressing the dispersion of dust.Seal equipment and pipelines: Equipment and pipelines that may generate dust can be sealed to reduce dust leakage. For example, install sealing covers on cold feeders, belt conveyors, or seal pipelines.Dust collection and treatment: Set up dust collection equipment such as dust collectors and dust collection tanks to collect and process generated dust so as to avoid pollution.Strengthen cleaning and maintenance: Clean equipment and areas regularly, remove accumulated dust in a timely manner, and maintain normal operation of equipment and dust control.These measures can effectively reduce the dust generated by asphalt mixing plants, while protecting the environment and the health and safety of workers. Below the main types of dust collection equipment for dust control in asphalt mixing plants:1. Cyclone dust collector: Cyclone dust collector is a device that uses centrifugal force to separate dust, which is suitable for handling dust with larger particle sizes. In asphalt mixing plants, this filter is often used to handle dust generated by equipment such as cold feeders and belt conveyors.2. Bag filter: Bag filter is a device that uses filter bags to filter and separate dust. It is suitable for handling dust with smaller particle size. In asphalt mixing plants, bag filters are usually adopted to deal with the asphalt fume generated at the discharge port of the mixer.3. Electrostatic precipitator: An electrostatic precipitator is a device that uses an electric field to collect and separate dust. It is suitable for processing gases with high temperature, high humidity, and high dust content. In asphalt mixing plants, electrostatic precipitators are frequently used to treat asphalt fumes emitted from chimneys.4. Wet dust collector: Wet dust collector uses water film to collect and separate dust, suitable for processing gases with high humidity and high dust content. In asphalt mixing plants, wet dust collectors are often adopted to handle dust generated by equipment such as cold feeders and belt conveyors.

Asphalt Mixture Quality Control-What Measures You Can Take?

In terms of asphalt mixture quality control, below some common measures:1. Selection of Raw Materials: Premium raw materials are the key to quality asphalt concrete. High-quality asphalt raw materials that meet national or industry standards should be selected to ensure that their physical properties and chemical composition meet the requirements.2. Detection and Analysis: Necessary detection and analysis of raw materials, including appearance, density, viscosity, softening point, penetration, solubility and other indicators. Through laboratory testing and analysis, the quality of raw materials is guaranteed to be stable.3. Production Process Control: Strictly control the production process, making sure the asphalt production process meets the standards and requirements, including the control of temperature, mixing time, mixing speed and other parameters, as well as the dosage and order of additives.4. Quality Monitoring: Establish a sound quality monitoring system to monitor and record key steps in the production process, such as raw material purchase inspection, production process monitoring, finished product inspection to ensure that the quality of asphalt in line with the requirements.5. Product Inspection: Carry out necessary inspections on the asphalt products, including the inspection of appearance, physical properties, chemical composition and other indicators. Through laboratory testing, the quality of asphalt products is guaranteed.6. Quality Management System: Establish and implement a quality management system, including quality control plans, quality document management, quality training, etc. Improve the stability and controllability of asphalt quality via standardized management and operation.7. Continuous Improvement: Regularly assess and analyze asphalt quality control, sum up experience and draw lessons, so as to continuously optimize these measures, and improve the stability and reliability of asphalt mixture quality. Apart from the common measures, some further information and methods can also be considered regarding asphalt mixture quality control:1. Standards: Understand and abide by relevant national, industry and technical standards, which specify the quality requirements and test methods of asphalt in detail. 2. Supplier Management: Choose reliable suppliers and establish long-term cooperative relationships. Evaluate and audit suppliers to make sure they can provide raw materials that meet the requirements, and establish a supplier quality management system.3. Defective Product Handling: Set up a defective product handling mechanism to promptly process and track the nonconforming product products, analyze the reasons and take measures to prevent similar problems.4. External Certification and Audit: Obtain quality management system certification through a third-party certification body, such as ISO 9001 quality management system certification. Internal and external audits can be carried out regularly to ensure the effectiveness and compliance of the quality management system.5. Technology R&D and Innovation: Pay attention to the latest technology and R&D achievements of the industry, actively participate in technical exchanges and cooperation in order to refine asphalt quality control with technological innovation.With comprehensive application of these methods, the quality of asphalt mixture would be effectively controlled, while the stability and reliability of the product could be further improved.

Working Process of Asphalt Recycling Equipment

Asphalt mixture recycling machine is a kind of equipment used to recycle waste asphalt mixture. Its working process mainly consists of the following steps.1. Crushing: First, the waste asphalt concrete will be fed into the crusher for crushing. The crusher breaks waste asphalt mixture into smaller particles for subsequent processing.2. Separation: The crushed asphalt mixture particles will be separated through a vibrating screen, which will separate and classify the particles into different grades based on their size for further processing.3. Washing: The separated asphalt mixture particles will be sent to the cleaning machine for washing. The equipment will use the water flow and the screen to remove the impurities and pollutants on the surface of the particles, ensuring the quality of the recycled asphalt mixture.4. Reproduction: The cleaned asphalt mixture particles will be sent to the recycling equipment for reproduction. Recycling equipment heats the pieces to a temperature that reactivates the bitumen inside, and then mixes it with new bitumen to form reusable asphalt concrete.5. Finished product processing: Finally, the recycled asphalt mixture will be sent out of the machine via conveyor belts or other means, and further processed, such as cooling and packaging for transportation and use.Through the working process above, the asphalt mixture recycling equipment can effectively convert the waste asphalt concrete into reusable materials, and realize the recycling of resources and environmental protection.

How to check Potential Safety Hazards in Asphalt Plant Station

It is essential to check the safety hazards of asphalt mixing plants. Below some possible safety hazards for your reference:1. Equipment safety: Check whether the mixing equipment, conveying equipment, electrical equipment, etc. are in normal operation, and whether there are problems such as damage, aging or leakage.2. Operation specification: Check whether the operator is operating according to the specification, and whether there is any illegal operation or improper operation.3. Protective facilities: Check whether necessary protective facilities are equipped, such as safety fences, protective nets, safety signs to ensure the safety of the work area.4. Hazardous goods management: Check whether the storage, use and handling of hazardous goods comply with relevant regulations, such as asphalt, solvents.5. Fire safety: Check whether the fire-fighting facilities are in good condition and effective, whether the fire-fighting exits are unblocked, and whether the fire extinguishers are regularly inspected and maintained.6. Staff training: Check whether the staff have received the necessary safety training, and whether they understand the emergency plan and safe operation procedures.7. Environmental protection: Check whether the discharge of waste water, waste gas, noise and other environmental pollutants meets the relevant standards, and whether corresponding control measures have been taken.

How to Choose the Site for Asphalt Mixing Plant?

Asphalt mixing plant site that occupies a very important position in the asphalt concrete pavement construction. Significantly influenced companies in the section of the road construction quality and construction costs. Different positions mixing station sitting, construction quality and construction costs are correspondingly different. Station location not only can determine the asphalt pavement construction progress, but also can largely determine the quality of asphalt.In the asphalt mixing plant sitting process, should highlight the main factors affecting site selection. Sitting of asphalt mixing plant has the following factors:1. Asphalt mixing plant and paving the scene in the distance.2. Asphalt mixing plant and materials in the distance.3. Transport conditions. If the situation is not clear when the road transport, shipping time will be spent too long during transport, and asphalt temperature will loss greater.4. Electric power supply. Determines the mixing station power supply is operating correctly.5. The available land area size. Because of the raw materials to be stacked with a certain space, the normal operation of vehicles need enough space, all asphalt mixing plant requires a large enough floor space to meet these requirements.6. Sites of natural conditions, station should be selected environmental and dry place.7. Environmental issues, the main consideration of asphalt mixing plant away from residential areas or densely populated areas, which can avoid causing air and noise pollution.

What are the types of asphalt mixing plant and how to choose?

Generally, asphalt mixing plant is consisting of two types, batch type and continuous type; each type has its advantages. Then, how to choose the right one for your project? Here are some tips.The key factors to choose a right type of asphalt plant are project requirements. In detail, capacity and finished asphalt quality matters. D&G Machinery has helped a lot of clients both domestic and abroad make right decisions on asphalt plant type, and we are glad to share them. First, let’s take a look at the characteristics and advantages of each type.Batch Type Asphalt Mixing PlantAt present, batch type asphalt mixing plant is the most popular due to the below: 1. Accurate weighing, precise screening and batching. Therefore, the finished asphalt mixture is of good quality.2. High efficiency, a single batch cycle is about 45 seconds and large capacity.3. The recipes of asphalt mixture produced by a batch mix asphalt plant can be adjusted easily, thus it produces various kinds of asphalt mixtures.4. It has wide applications, including highways, airports, national roads, city roads and country roads, etc.5. Easy operation. Nowadays, most batch mix asphalt plant is automatically controlled.Continuous Asphalt Mixing Plant1. As is known by its name, a continuous mixing plant will produce asphalt mixture in a consistent run once it is started. Aggregate drying, heating and mixing are all taken place in a drum. Compared with a batch plant, a continuous asphalt plant is simple in structure because it has no mixing tower and elevating system; therefore, it required less land, less maintenance cost. 2. However, due to lack of precise screening, it requires precise control over aggregate feeding at the very beginning of a production.3. A continuous asphalt plant required less initial investment compared with a batch mix one (with same capacity).WeighingBatch type asphalt mixing plant: weighed by weight, each different sizes aggregate is metered independently, thus it is much preciser.Continuous asphalt mixing plant: weighed by volume, which is relatively not so precise.MixingBatch type asphalt mixing plant: usually materials (aggregate, filler, bitumen, additives if necessary) are mixed in double-axles mixer, and mixing is conducted by batches, therefore, the mixing performance is even and homogeneous. Besides, the batch circle can be shortened or extended according to finished asphalt quality. What’s more, the way can be adjust very quickly and easily. All in all, a batch mix plant is an ideal equipment for high quality and special asphalt mixtures such as porous pavement, polymer modified asphalt pavement, emulsified asphalt pavement and RAP materials.Continuous asphalt plant: the mixing must be consistent, steady and long enough.Finial DecisionThe aforesaid tips are just for reference. The final decision is up to client. But in general, a batch mix asphalt plant is best for a large and medium-sized road construction project which requires high quality asphalt mixture. While a continuous asphalt plant is suitable for small and medium-sized road construction project which has tight investment.

How is our product packaged ?

Q: How is your products packaged?A: As a professional asphalt mixing plant manufacturer, we have professional packaging process and control.

How to locate the induction switch of the hot storage bin?

For example, locate the reject bin,First make sure the air pressure is enough,the position of the induction switch in the reject bin,Rotate the bin selection switch to the reject bin position ,confirm that the bin selection in place signal is activated,then turn the skip mode switch to the "manual" position,Press and hold the skip up switch, then the skip moves slowly until the induction switch of the reject bin is sensed and stops , At this time, release the skip up switch, press the skip stop knob, and turn the mode selection switch to the "memory" position, At this time, the system has memorized the position in the reject bin, Then loosen the skip stop knob, press and hold the skip down switch to move the skip to the position under the mixer.