Standard: ASTM D1559, EN 1269/35, BS 598-107
Asphalt Mixer
The Asphalt Mixer is used for bituminous homogenous mixing by blending bitumen with aggregates to create a uniform mixture for asphalt pavement, highways, parking lots, and other surfaces requiring durable and weather-resistant pavement.
The mixer has been designed for bituminous homogenous mixing and consists essentially of a horizontal tilting thermostatic drum. The tilting drum is at 130° angles. The mixing chamber is heated by the dielectric chamber with diathermic thermostatic control. The unit comes with a PID temperature control unit with a digital display. This large capacity heavy-duty mixer is designed to mix bituminous samples for tensile splitting tests, compaction tests, marshall and other tests where uniformity is required. The mixer mixed homogeneous, uniform efficient fast mixture action. They are of easy and practical utilization suite for laboratory purposes. This mixer features 20 litres capacity. The bituminous mixture can be easily discharged by the total turnover of the mixing chamber.
Features of Asphalt Mixer
- Heating via a dielectric chamber with precise thermostatic control.
- Horizontal tilting drum with a 130° angle for efficient mixing.
- PID temperature control unit with a digital display.
- Large capacity heavy-duty design suitable for mixing bituminous samples for various tests, including tensile splitting, compaction, and Marshall tests.
- Provides homogeneous, uniform, and fast mixing action.
- Easy and practical utilization, ideal for laboratory purposes.
- Features a 20-litre capacity mixing chamber.
- Easy discharge of the bituminous mixture facilitated by the total turnover of the mixing chamber.
Technical Specifications
| Model Number |
NL 2034 X / 003N |
| Mixing Capacity |
10 Litres |
| Drum Capacity |
20 Litres |
| Planetary Speed |
45 ±5 RPM |
| Spindle Speed |
75 ±5 RPM |
| Temperature Range |
Ambient - 250°C (Adjustable) |
| Temperature Accuracy |
±3˚c |
| Setting Timer |
1 - 999 Seconds |
| Overall Dimension |
1200 (L) x 550 (W) x 1320 (H) mm |
| Packing Dimension |
1300 (L) x 650 (W) x 1520 (H) mm |
| Heating Power |
3000 W |
| Approx. Weight |
196 kg |
| Packing Weight |
216 kg |
| Power |
Machine: 220 - 240 V, 1 Ph, 50 / 60 Hz, 15 A
Motor: 750 W, 1 Hp, 4.5 A |
Unit Consist Of:
| Model Number |
Parts Description |
| NL 2034 X / 002 – P 001 |
Whisk Paddle |
| NL 2034 X / 002 – P 002 |
Sampling Spoon |
Standard
- ASTM D1559 - A standard test method for evaluating the mechanical properties of asphalt mixtures, including Marshall stability, flow, and density. It provides guidelines for preparing and testing cylindrical specimens of compacted asphalt mix to assess their resistance to deformation and rutting under load.
- EN 12697-35 - A European standard that specifies a method for determining the resistance of asphalt mixtures to permanent deformation using the repeated load indirect tensile (RLIT) test. It involves subjecting cylindrical specimens of compacted asphalt mix to repeated compressive loading at controlled temperatures to assess their resistance to rutting and fatigue cracking.
- BS 598-107 - A British standard that outlines procedures for determining the properties of asphalt mixtures, including density, stability, flow, and air void content. It provides guidelines for preparing and testing Marshall specimens of compacted asphalt mix to evaluate their mechanical and volumetric characteristics for use in road construction.
Test Procedure of Asphalt Mixer
- Aggregate and Asphalt Cement Preparation: Prepare the aggregates, sand, fillers, and asphalt cement according to the mix design specifications. Ensure that the materials are properly graded and proportioned for the desired asphalt mix.
- Heating the Mixer: Heat the mixing chamber to the specified temperature using the heating system. Maintain the temperature within the desired range throughout the mixing process.
- Loading: Load the preheated aggregates, sand, fillers, and asphalt cement into the mixer in the prescribed proportions. Ensure that the materials are added gradually and evenly to promote thorough mixing.
- Mixing: Start the mixing process and allow the materials to blend inside the mixer. Monitor the mixing time to ensure that the mix reaches the desired level of homogeneity.
- Sampling: Take samples of the asphalt mix at regular intervals during the mixing process. These samples will be used for testing the properties of the mix, such as gradation, density, and binder content.
- Discharge: Once the mixing is complete and the desired homogeneity is achieved, discharge the asphalt mix from the mixer. Ensure that the discharge mechanism is functioning properly and that the mix is discharged completely.
- Data Evaluation: Evaluate the test results to ensure that the asphalt mix meets the specified quality requirements. Make any necessary adjustments to the mix design or mixing process based on the test results.
Type of Testing Using Asphalt Mixer
Gradation Analysis
Gradation analysis is performed to determine the particle size distribution of the aggregates used in the asphalt mix. This analysis involves sieving the aggregates through a series of standard-sized sieves and measuring the weight of the material retained on each sieve. The results are then plotted on a gradation curve, which provides information on the distribution of coarse and fine aggregates within the mix. Proper gradation is essential for achieving the desired density, stability, and performance of the asphalt pavement.
Binder Content Determination
Binder content determination involves determining the percentage of asphalt binder present in the asphalt mix. This is typically done using solvent extraction methods, where a sample of the asphalt mix is dissolved in a solvent to extract the asphalt binder. The remaining aggregate material is then dried and weighed to calculate the binder content. The binder content is a critical parameter that influences the strength, flexibility, and durability of the asphalt pavement.
Density and Compactability Tests
Density and compactability tests are conducted to evaluate the compacted density and the ability of the asphalt mix to achieve the desired density under compaction. Various methods, such as the gyratory compaction test or the core density test, are used to measure the density of the compacted asphalt mix. These tests help ensure that the asphalt pavement will have sufficient strength and durability to withstand traffic loads and environmental conditions.
Marshall Stability and Flow Tests
Marshall stability and flow tests are performed to assess the resistance of the asphalt mix to deformation and rutting under load. In the Marshall stability test, a cylindrical specimen of the compacted asphalt mix is subjected to compressive loading at a controlled rate until failure occurs. The maximum load sustained by the specimen represents its Marshall stability. The flow test measures the deformation or flow of the asphalt mix under a specified load. These tests provide valuable information about the structural integrity and performance of the asphalt pavement.
Moisture Susceptibility Tests
Moisture susceptibility tests evaluate the resistance of the asphalt mix to moisture damage, such as stripping or loss of adhesion between the asphalt binder and the aggregate particles. Various tests, such as the immersion compression test or the tensile strength ratio test, are used to assess the susceptibility of the asphalt mix to moisture-induced damage. These tests help ensure that the asphalt pavement will maintain its integrity and performance in wet or humid conditions.
