Why Intelligent Compaction?

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Presentation transcript:

Why Intelligent Compaction? Proper in-place density is vital for good performance Conventional compaction equipment and procedures have shortcomings and too often produce poor results Intelligent compaction technology appears to offer “a better way”

Proportion of spot-testing to the quantities placed 1 : 1,000,000 Conventional spot-testing non-destructive spot-testing destructive spot-testing Proportion of spot-testing to the quantities placed 1 : 1,000,000 Troxler PQI/PDM Drill-core Troxler: Radiometrische Sonde – Strahlen in den Asphalt – Sensor – Rückschluss auf den Verdichtungsgrad PQI: Kapazitive Sonde – entwickelt elektromagnetisches Feld – Widerstand- Rückschluss auf den Verdichtungsgrad Bohrkern: Zerstörung der Asphaltschicht – Analyse im Labor 1:1.000.000: Entspricht nicht mehr den heutigen Qualitätsanforderungen / Stand der Technik

Sampling Coverage 1 / 1,000,000 100 % Coverage Courtesy of Trimble/Caterpillar

Conventional rolling – passes Up to 13 passes Specified: 8 Passes Up to 15 passes Achieved ∅: 5.7 Passes 1 pass Blindversuch Überfahrten mit GPS-Navigator mitgeschrieben Fazit: mit einer Anzeige der Überfahrten - sehr viel homogenere Verdichtungsarbeit Schwer den Überblick zu behalten (besonders auf großen Baustellen) Passes 4 3 1 2 5 6 7 8 >8

HAMM Compaction Quality (HCQ)

IC Roller Requirements (FHWA) IC Measurement Value (ICMV) GPS-based documentation system On-board, color-coded display Surface temperature measurement system

HAMM Double Drum IC System GPS Receiver HCQ GPS Navigator Temperature Sensors Accelerometer Control Panel

Components: HCQ-Box Der HCN besteht vereinfacht aus dem DGPS-Receiver, der die Signale von 3 bis 8 GPS Satelliten und des Differential Satelliten empfängt. Weiterhin beinhaltet der HCN das Verdichtungsmesssystem HCM, das die Signale des Beschleunigungssensors in Verdichtungsmesswerte umrechnet. Der jeweilige Messwert des Verdichtungsmesssystems wird zusammen mit den Positionssignalen des DGPS-Reseivers - also den Positionskoordinaten der Walze zum Zeitpunkt der Messung - an einen Rechner in der Walzenkabine übertragen. Bei diesem Rechner handelt es sich um einen mobilen PC, der speziell für den Einsatz auf Baumaschinen und Baustellen ausgelegt ist. HCQ-GPS Navigator

Roller measurement values Ammann kb CAT CMV, MDP HAMM HMV to do: add HAMM HCQ Bomag EVIB Dynapac CMV Sakai CCV 9 9

% multi-dimensional process evaluation Parameters affecting Process Evaluation passes stiffness value Lift thickness multi-dimensional process evaluation asphalt temperature mix amplitude Die verschiedenen Parameter werden in die Prozessbewertung einfließen Panel-PC bewertet die Parameter bzw. Messdaten und bereitet sie für den Fahrer graphisch auf frequency % type and weight speed

Data Collection

Summary HCQ offers a valuable new tool to the Contractor and Agency to improve Quality Control and pavement service life Improved density…. Better performance Improve efficiency…. Cost savings Overall Benefit: Enables consistency and therefore provides Improved Pavement Performance!