Ranking System for Non- Destructive Testing Devices to Assess
Quality of HMA during Construction Ahmed Faheem Bloom Companies LLC
Dr. Robert Schmitt UW Platteville Dr. Imad Al-Qadi UIUC
Slide 2
Strategy Define Critical Characteristics of Compaction Identify
Non-Destructive Technologies Rank Technologies on Technical Merits,
field, portability, training, cost, practicality Goal Investigation
and Development of a Non- Destructive System to Evaluate Critical
Properties of Asphalt Pavements during the Compaction Process
Slide 3
Project Stages Stage 1: Determine critical properties Select
promising non-destructive testing technologies Stage 2: Field data
collection Select field compaction sites Collect data using
proposed NDTs Stage 3: Data Analysis Analyze data Evaluate quality
of data collected from each NDT
Slide 4
Background and Stage 1 Objective Non-destructive technologies
are emerging Move beyond density and smoothness New measures for
characterizing pavement Ability to assess entire pavement sections
Real-time data retrieval Objective: Rank NDTs to guide agency
selection
Slide 5
Critical Characteristics Survey of 12 states by Washington DOT
(1999)
Slide 6
Critical Characteristics and Impact Agency-specific rank: #1 #2
#3
Slide 7
Critical Properties - Characteristics critical to compaction
from Lit. Search: 1. Mix segregation 2. In-place compaction 3.
Smoothness 4. Temperature segregation 5. Layer thickness 6. Layer
bond 7. Pavement modulus - Agency-specific: 1.In-place compaction
2.Temperature segregation 3.Pavement modulus
Slide 8
Non-Destructive Technologies: Factors to Consider: Operational
principle Measures and indicators Test equipment Portability of the
test Complexity in the field Time to conduct test Environmental
limitations Reliability of collected data Degree of training
required Cost States using in practice Available Technologies