Page 129 - SAPEM-Chapter-10-2nd-edition-2014

South African Pavement Engineering Manual
Chapter 10: Pavement Design

Desirable Aspects of Mechanistic Cautionary Aspects for Mechanistic
Design of Concrete Pavements Design of Concrete Pavements
• Easy to use • Default values provided with software need to be
• Updated regularly adjusted for specific designs
• Calibrated for South African conditions • Ensure that variation in properties are realistic
• Allows for different slab support layers and reflect actual conditions
• Suited to new and rehabilitation design
• Can do “what-if” analyses to study the outcome of
different input parameters on the design
• Calculates life cycle costs

8.3 Summary of Suitability of Structural Design Methods for Concrete Pavements
Table 53 provides a summary of the potential application of the structural design methods discussed in the preceding
sections.

Table 53. Potential Application of Structural Design Methods

Method Potential Application
New Rehabilitation Design
Design Initial Assessment Rehabilitation Design –
– Remaining Life Future Structural
Capacity
M10   
C & CI rigid pavement design method   

8.4 Software Package for Concrete Pavements: cncPAVE

The software package cncPAVE can be obtained from Dr Pieter Strauss, pieter@strausscc.co.za. cncPAVE models the
structural deterioration of plain, dowel jointed, continuously reinforced concrete and UTCRCP. The following damage
mechanisms are provided for:
• Percentage of shattered concrete surface
• Percentage of pumping concrete surface
• Percentage faulting in plain and dowel jointed concrete
• Crack spacing in continuously reinforced concrete

cncPAVE also models the life cycle cost of concrete pavements. Table 54 summarises the functionality of the
software. cncPAVE will be incorporated into the new South African Pavement Design Method (SAPDM).

Section 7: Structural Capacity Estimation: Concrete Pavements
Page 118