Aspects of cement stabilized Mozambique sand base material performance under MMLS3 and MLS10 APT trafficking

Abstract

Paper presented at the 26th Annual Southern African Transport Conference 9 - 12 July 2007 "The challenges of implementing policy?", CSIR International Convention Centre, Pretoria, South Africa. ABSTRACT: The World Bank sponsored research to support preservation and maintenance efforts in Mozambique. The object was to develop guidelines for a mechanistic-empirical design method for cement stabilized sand bases (CTB) in Mozambique using Accelerated Pavement Testing (APT) technology. APT encompassed scaled (one third) and full-scale APT using mobile load simulator technology (MMLS3 and MLS10). The MLS10 expanded the MMLS3 APT investigation to full-scale pavements, including wet trafficking cycles to emulate environmental effects. Operation of the MLS10 is similar to the MMLS3. It has four sets of dual wheels running in a closed loop with a maximum speed of up to 22 kph. Loads of 60kN and 70kN were used for trafficking. Fifteen MMLS3 tests and six full-scale test sections were tested. Comparative results between MMLS3 tests and full-scale MLS10 tests were found. Distress mechanisms were similar. Related design features and material strength parameters were used as supplementary and verification tools.