SAMI 0.99g/cm3 Pavement Preventive Maintenance stress absorbing membrane interlayer
Strain Alleviating Membrane Interlayer (sami) Prevent Reflective Cracks on Pavement
prevent reflection cracks on asphalt pavement
1. Description
Strain Alleviating Membrane Interlayer (sami) is arranged between the asphalt concrete surface and the existing cement concrete pavement. The high elastic stress absorption layer plays the role of absorbing stress, waterproofing and sealing water, and preventing reflection cracks. Overlaying stress-absorbing layer has achieved certain effect in preventing reflection cracks in asphalt pavement. Reflective cracks are a common form of damage on asphalt pavements. Reflective cracks are mainly reflected from cracks and construction joints in semi-rigid base or other lower bearing layers.
ZTS high-elasticity crack-resistant stress-absorbing layer is a stress-absorbing layer technology developed by our company to solve the problems of poor construction convenience and high cost of the existing paving-type stress-absorbing layer technology. By adding a direct-injection admixture (VE-high elastic anti-cracking additive) to the base asphalt, the cohesiveness, low temperature resistance and fatigue resistance of the asphalt mixture are improved. The discontinuous gradation ensures that the ZTS stress absorbing layer has a certain ability to resist high temperature deformation. The construction and workability of ZTS technology is good, no special modified asphalt and special paving equipment are needed, and the cost is low. Environmentally friendly and pollution-free.
ZTS Strain Alleviating Membrane Interlayer (sami) between the cracked structure layer and the asphalt overlay is an effective measure to prevent reflection cracks. It is an asphalt mixture with strong adhesion, impermeability, and good interface bonding performance, can deform with the deformation of the base layer, and has excellent self-healing ability.
Advantages of Strain Alleviating Membrane Interlayer (sami):
- Good adhesion, low temperature resistance and fatigue resistance.
- Resistance to high temperature deformation.
- The construction workability of the asphalt mixture is better.
- Construction is more convenient by using ordinary asphalt paver.
- No special modified bitumen and special equipment are needed in the production and construction process, the cost is more lower.
- Environmental protection, no restrictions on asphalt paving.
Table 1 Technical indicators of VE high-elastic anti-cracking additive
| Item | Unit | Technical Requirement | Test Method |
| Appearance | - | Uniform and full particles | - |
| Single particle weight | g | ≤0.015 | - |
| Density | g/cm³ | 0.85～0.99 | GT/T1033 |
| Melt Index(135℃,2.16kg) | g/10min | ≥3 | GT/T3682 |
| Ash content | % | ≤1 | T0614 |
2. Special additive for Strain Alleviating Membrane Interlayer (sami)
ZTA-VE asphalt additive are a new type of composite asphalt additive developed by Beijing Zhongtian Road Tech Co. Ltd. It integrates the technical characteristics of high viscosity, high elasticity, wide temperature range, and warm mixing to improve the crack resistance and fatigue resistance of road materials, reduce the difficulty of road construction, energy saving and environmental protection.
3. Production and Construction of Asphalt Mixture of Strain Alleviating Membrane Interlayer (sami)
When mixing ZTS mixture, firstly add all grades of aggregate and VE high-elasticity anti-cracking additive for dry mixing, then add bitumen and mineral powder, and the mixing time is not less than 45 seconds, of which ZTA-VE additives and aggregate are dry mixed for 10 seconds. The temperature control requirements are shown in Table 2.
Table 2 Temperature control table for mixing and construction
| Construction Stage | Temperature |
| Bitumen heating temperature | 140℃～150℃ |
| Mineral heating temperature | 170℃～200℃ |
| Asphalt mixture delivery temperature | 150℃～185℃ |
| Asphalt mixture waste temperature | ＞195℃ |
| Paving temperature | ≥140℃ |
| Initial compacting temperature | ≥135℃ |
| Repeat compacting temperature | ≥125℃ |
| Final compacting temperature | ≥70℃ |
The paving speed of asphalt paver is 3m-6m/min.
The repeat compacting roller needs to be rolled closely with the initial compacting roller.
The initial compacting adopts 13 tons - 15 tons of drum rollers
The repeat compacting adopts 20 tons - 26 tons rubber wheel rollers
The final compacting adopts below 11 tons of drum roller
(The vibration is not turned on during the rolling process)
Traffic can be opened only when the road surface temperature is lower than 50°C
4. Technical comparison of ZTS Strain Alleviating Membrane Interlayer (sami) & conventional rubber asphalt stress absorption layer
| Item | ZTS high elastic anti-crack stress absorption layer | Rubber Asphalt Stress Absorbing Layer |
| Dynamic stability (Times/mm) | >1500 | >500 |
| Low temperature bending micro strain (με) | >4000 | 2000-4000 |
| Paving temperature (℃) | >140 | >160 |
| Rolling temperature (℃) | >135 | >155 |
| Impact on environmental protection | no effect | Strong smell |
| Ease of use | Directly mixed into the asphalt plant, convenient | Need strict cooperation, strict quality control |
5. Company information
Beijing Zhongtian Road-Tech Co.,Ltd. is the Board of Directors of China Transportation Association and Transportation Committee of China Technological Market Association, with expert technical R&D team, continuous innovation ability, rich engineering experience and sufficient capacity. Also we participated in designated road material industry standard certificates.
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