Page 167 - RoadCem Manual - PCT BV

Conventional contract relations with a supervising body - often a consultant - carrying out control of the works is a common system used. Under these circumstances, end-product quality control is routinely included in elaborate systems and is applied with great effect on projects where roads are constructed. It is commonly considered necessary to establish full laboratory services on site for control of workmanship and material quality.
The inherent compromise for quality control and assurance will often require innovative solutions and focus on the overall quality assurance system to achieve optimal results.
Table 5.10 The Priority list for Quality Control when using RoadCem based road construction method
Priority
Layer
Comments
1
Bituminous surfacing
- Choice of equipment, choice of material tpe, visual assessment and measurement of application rates is of greatest importance.
- Only basic laboratory equipment is essential for effective control during operation.
2
Surface finish of the base course
- Biscuit layers are the most common reason for an unacceptable product. A geological hammer/pick can be used to identify such flaws.
- Visual assessment, plus choice of equipment and working method is of greatest importance.
- Laboratory equipment is not essential for effective control during operation.
3
Material quality of the base course
- Laboratory tests in advance and after construction, combined with indicative tests or observations during construction, are essential.
4
Compaction control of the base course
- Method specifications, appropriate choice of method and equipment, visual assessment and proof rolling, in combination with regular testing for “calibration”.
5
Subbase and earthworks
- Visual assessment and laboratory tests ahead of construction given improved confidence in material quality.
- Method specifications, visual control, proof rolling and appropriate choice of method and equipment are sufficient for site control of workmanship.
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