Bitumen Stabilized Material
What is ANT Bitumen Stabilized Material (BSM)
As per ‘Guideline for the Design and Construction of Bitumen Emulsion and Foamed Bitumen Stabilized Materials (TG2 Third Edition August 2020, Sabita), Bituminous Stabilized Materials (BSMs) are formed by treating granular materials with bitumen emulsion or foamed bitumen. These materials can include recycled asphalt. BSMs improve pavement strength and reduce moisture sensitivity. Bitumen emulsion and foamed bitumen are applied differently, impacting how bitumen is dispersed among the finer particles. BSMs offer a sustainable and cost-effective approach to pavement construction and rehabilitation.
ANT BSM, a revolutionary advancement in BSM technology, offers the following key advantages:
- Significantly Reduced Emulsion Consumption: Utilizes specialized emulsion and innovative ANT Technology, typically reducing emulsion consumption to around 1.5% or lower, depending on the specific job mix.
- 100% Recycled Asphalt Pavement (RAP) Utilization: Maximizes the use of recycled materials, minimizing environmental impact and promoting sustainability.
- Exceptional Performance: Achieves high values of Dry Indirect Tensile Strength, Wet Indirect Tensile Strength, and Tensile Strength Ratios, consistently meeting and exceeding stringent quality requirements.
Through these advantages, ANT BSM provides superior durability, cost-effectiveness, and environmental sustainability compared to traditional BSMs, making it the ideal choice for modern pavement construction and rehabilitation projects.
IRC 37-2018
Bitumen Emulsion/ Foamed Bitumen Treated RAP
- Resilient Modulus Minimum value: 800 MPa
-
Indirect Tensile Strength:
1. Minimum value after soaking: 100 kPa
2. Minimum value in dry condition: 225 kPa
(provide the above two points as bullets)
ANT Bituminous Stabilized Material
- Resilient Modulus achieved: up to 4000 MPa
-
Indirect Tensile Strength achieved:
1. Minimum value after soaking: 180 kPa
2. Minimum value in dry condition: 230 kPa
(provide the above two points as bullets)
- Tensile Strength Ratio achieved: 79%
Good BSM
Bad BSM or conventional DBM/ BC layer
Laboratory & Field Evaluation of Bituminous Mix with ANT Cold Mix Modifier
Report by CSIR – Flexible Pavements Division, Central Road Research Institute (CRRI), New Delhi
— Significance – This prestigious study by CRRI underscores the sustainable and structural advantages of the ANT modifier in bituminous applications.
Key Conclusions from the Study
- Enhanced Strength: ANT modifier addition increased ITS
- Cement Impact: Enhanced strength alongside ANT
- Emulsion Influence: Improved ITS when combined with ANT.
- Cracking Resistance: ANT modifier increased fracture energy, improving material flexibility
- Resilient Modulus: 25-30% rise due to ANT
- Rut Resistance: Rut depth reduced enhancing rut resistance.
Job Mix Formula Development
- Sampling RAP materials and creating trial mixes with varying %s
- Lab tests such as Gradation, Marshall Stability, Flow Value, Indirect Tensile Strength, Tensile Strength Ratio etc.
- Formulation of Job Mix Formula based on test results
Construction Methodology
- Pulverization of RAP)
- Mixing of materials cement, emulsion, ANT Modifier and RAP.
- Placement and compaction on-site.
Mixing Process
In-Plant & In-Place Mixing Processes
In-Plant
- Mixing ANT Modifier with RAP using mixing plant equipment
- Addition of cement and RAP on the mixing belt
- Spray of emulsion and ANT modifier in mixing chamber
In-Place
- Use of water and emulsion tankers connected to recycler
- Cement spreading, followed by mixing ANT Modifier solution
- Pulverization and injection of bitumen emulsion and ANT Modifier
Placement, Compaction, Standard Testing and Results for BSM
Compaction
- In plant –Transportation to site, spreading with grader / paver
- In place –Achieving required grade using grader
- Compaction with rollers
Testing
- Density and compaction testing post-rolling
- Marshall Stability, ITS results of cores collected
- Comparison of test results with standard BSM metrics
