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Bitumen Stabilized Material
What is ANT Bitumen Stabilized Material (BSM)
ANT BSM is a mixture of bitumen-emulsion-treated reclaimed-asphalt-pavement (RAP) or fresh aggregates, filler material like stone dust and bituminous binder material that is used in the base layer of flexible pavements. When a pavement gone under distress, recycling of existing pavement materials for rehabilitation of roads has gained considerable importance due to depletion of natural source of aggregates and high cost of transportation of highway materials. Bitumen Stabilized Material (BSM) is generally bitumen-emulsion/ foamed-bitumen-treated reclaimed-asphalt-pavement (RAP) and is used in construction of base layer.
ANT Technology
A Sustainable Path Forward for Road Construction
— Introducing future of road construction
- An innovative, next-generation technology focused on sustainable development.
- Minimizes exploitation of natural resources.
— Carbon credit
- Reduced carbon footprint
- Embodied Carbon
- Operational Carbon
- Enhanced Strength & Durability
Bituminous Stabilized Material
Achieving More with Less: Maximum Strength, Minimal Emulsion
- Bitumen Stabilized Material (BSM) is generally bitumen-emulsion/ foamed-bitumen-treated reclaimed-asphalt-pavement (RAP) and is used in construction of base layers.
Introducing ANT Cold Mix Modifier
- ANT Cold Mix Modifier drastically reduces consumption of bitumen emulsion. Aqueous solution of “ANT” Stabilizer is used for creating mix with RAP.
Good BSM
Bad BSM or conventional DBM/ BC layer
Laboratory & Field Evaluation of Bituminous Mix with ANT Modifier
— Report
- Report by CSIR-Central Road Research Institute
- Issued: June 2022, Flexible Pavements Division, CRRI, New Delhi
— Significance
- This prestigious study by CRRI, led by esteemed scientists Dr. Ambika Behland Dr. G. Bharath, underscores the sustainable and structural advantages of the ANT modifier in bituminous applications.
Key Conclusions from the Study
— Test Results
- 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.
JMF Development and Construction Methodology for BSM
— JMF
- Sampling RAP materials and creating trial mixes with varying %s
- Lab tests -gradation, strength (Marshall Stability and ITS)
- Formulation of JMF based on test results
— Construction
- Preparation of materials (pulverizing RAP)
- Mixing of materials (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
Case Studies of BSM Implementation
Some notable projects
— Uttarakhand
- Strengthening work from NH-707 A (Tyuni-Chakrata-Mussoorie)
— West Bengal
- NH-717A Pedongto ReshiBorder, highlighting flexible pavement design
— Uttar Pradesh
- NH 34 (Ghaziabad to Aligarh) using cold in-place recycling
Bituminous Stabilized Material
Strengthening Work from Zero Point (Lal Bahadur Shastri National Academy of Administration Junction) to Library Chowk, Mussoorie(Ch. 160.00 to 161.50 km)
— Salient
- Location: Section of NH-707 A (Tyuni-Chakrata-Mussoorie Dhanaulti-New Tehri), Uttarakhand
- Scope of Work: Bituminous Stabilized Material (BSM) Improvement
— Introduction
- Evaluation: Evaluate RAP material from Mussoorie for BSM with ANT cold modifier
- Method: Comparative analysis of trial combinations to maximize RAP material usage
- BSM Composition: Coarse and fine aggregates, bitumen
Gradation
| IS Sieve Size (mm) | % Passing |
|---|---|
| 13.2 | 100 |
| 9.5 | 98.60 |
| 4.75 | 47.35 |
| 2.36 | 30.14 |
| 1.18 | 18.93 |
| 0.300 | 12.03 |
| 0.075 | 3.18 |
Mix Combinations
— CM1
- 100% RAP + 1% Cement + 1% Emulsion + 0.007% ANT Cold Mix Modifier
— CM2
- 100% RAP + 1.5% Cement + 1.5% Emulsion + 0.007% ANT Cold Mix Modifier
— CM3
- 100% RAP + 2% Cement + 1.5% Emulsion + 0.007% ANT Cold Mix Modifier
Indirect Tensile Strength (ITS) Results
— CM1: 1% Cement, 2% Emulsion, 0.007% ANT
- Dry ITS Avg: 154.33 KPa
- Wet ITS Avg: 112.33 KPa
- TSR:72.78% (Min. 75% per IRC:SP:100-2014)
— CM2: 1.5% Cement, 1.5% Emulsion, 0.007% ANT
- Dry ITS Avg: 229.33 KPa
- Wet ITS Avg: 180.33 KPa
- TSR:78.63% (Meets IRC requirements)
— CM3: 2% Cement, 2% Emulsion, 0.007% ANT
- Dry ITS Avg: 231.66 KPa
- Wet ITS Avg: 176.33 KPa
- TSR:76.11% (Meets IRC requirements)
Stability and Flow Test Results for Indirect Tensile Strength (ITS) Testing
- Single compressive force applied vertically to cylindrical specimens.
- Testing temperature: 25°C, load rate: 50 mm/min.
Recommended Mix:
CM2 – Satisfactory performance in TSR & stability parameters.
— CM1
- Avg. Stability (kN) - 6.45
- Avg. Flow (mm) - 3.00 (Min. 4.905)
— CM2
- Avg. Stability (kN) - 7.359
- Avg. Flow (mm) - 8.01 (Min. 8 mm)
— CM3
- Avg. Stability (kN) - 6.996
- Avg. Flow (mm) - 8.883 (Meets IRC standards)
