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The road N7 270 km long Crossroad from N6 to Luenha River in Manica Province, rehabilitation completed in 2010, composed by double bitumen surface treatment (DBST), 15 cm of cemented stabilized base course and the sub-base in granular material or gravel. Currently, most of the sections present high degradation outcropping potholes due to the ageing of the pavement, associated with heavy traffic sometimes overloaded. Thus, two hybrid contracts were designed, first for Periodic Maintenance to recycle and cement chemical stabilization 110 km of existing base and build 130 km of new DBST within 1 year and Routine Maintenance of the entire 270 km extension in 5 years. The paper main objective is to evaluate 2 recycled bases (green pavements) performance, one of 5% cement chemically stabilized and other mechanically stabilized, with another two new bases course imported material, one of 5% cement chemically stabilized and other mechanically stabilized. All 500 m long coated bases with new DBST and exposed to the same traffic. Tested samples from the existing road material, nearest experimental section borrow pit and CBR, UCS/ITS of 5% cement chemical stabilized material results were obtained, Atterberg Limits, Sieve Analysis were evaluated, N7 road traffic studied and finally designed 4 different bases (G4 and C3) according to TRH4. Cost analysis demonstrated that the cheapest solution is mechanical stabilized recycled base being 50% cheaper than the convention new CTB and all the 4 Experimental Section fit to the designed traffic which 47% is heavy.

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Analysis of Characteristics of Multi-section of Mechanical Stabilized Recycled Base/CTB and New Mechanical Stabilized Base/CTB at N7 in Mozambique

  • 会议论文

  • 发表日期：

    2025年

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  • Moises Dzimba

摘要

The road N7 270 km long Crossroad from N6 to Luenha River in Manica Province, rehabilitation completed in 2010, composed by double bitumen surface treatment (DBST), 15 cm of cemented stabilized base course and the sub-base in granular material or gravel. Currently, most of the sections present high degradation outcropping potholes due to the ageing of the pavement, associated with heavy traffic sometimes overloaded. Thus, two hybrid contracts were designed, first for Periodic Maintenance to recycle and cement chemical stabilization 110 km of existing base and build 130 km of new DBST within 1 year and Routine Maintenance of the entire 270 km extension in 5 years. The paper main objective is to evaluate 2 recycled bases (green pavements) performance, one of 5% cement chemically stabilized and other mechanically stabilized, with another two new bases course imported material, one of 5% cement chemically stabilized and other mechanically stabilized. All 500 m long coated bases with new DBST and exposed to the same traffic. Tested samples from the existing road material, nearest experimental section borrow pit and CBR, UCS/ITS of 5% cement chemical stabilized material results were obtained, Atterberg Limits, Sieve Analysis were evaluated, N7 road traffic studied and finally designed 4 different bases (G4 and C3) according to TRH4. Cost analysis demonstrated that the cheapest solution is mechanical stabilized recycled base being 50% cheaper than the convention new CTB and all the 4 Experimental Section fit to the designed traffic which 47% is heavy.