REVIEW QUESTIONS - SET NO. 1
These questions are to serve as study guides for Test No. 1.
TYPES OF PAVEMENT
What are the major differences between flexible and rigid pavements in terms of how
they carry the loads?
Give an example pavemen
Asphalt Pavement Recycling
Benefits of Asphalt Pavement Recycling:
Conservation of Aggregate and Asphalt
Preservation of Existing Pavement Geometrics
Preservation of Environment
Conservation of Energy
Elimination of Reflective Cracking
Recycling Concrete Pavement
Procedures for Recycling of Concrete Pavement
Uses of Recycled Concrete Pavement
(1) Aggregate in bituminous mixtures
(2) Aggregate base
(3) Filter material
(4) Aggregate in econocrete
(5) Aggregate in Portland cem
Diamond Grinding, Grooving and Cold
Diamond Grinding Cutting concrete surface with
closely spaced diamond blades. The main purpose
is to remove material and provide a smooth
Grooving Cutting concrete surface to provide a
Cement Grout Undersealing and
Cement Grout Undersealing Insertion by
pressure of a cement grout mixture beneath a
slab to fill voids and prevent pumping.
Slab Jacking Lifting of the slab in areas of
To stabilize the existi
Transverse joints and longitudinal joints in
concrete pavements, and cracks in concrete
and asphalt pavements need to be properly
sealed for the following reasons:
1. To prevent the infiltration of incompressible materials in
the joints or cracks, which c
Photos from a Past Research Project on Partial Depth
Repair of Airfield Concrete Pavement
and high heat
from jet engines
Photo of scaling on the concrete surface
Photo of scaling on the concret
Partial-Depth Concrete Slab Repair
-Used to address spalls or scaling which do not
extend through the full depth of the slab, but affect
only the top few inches.
-Restores rideability of the pavement.
-Retards pavement deterioration.
-Prevent premature ov
Full-Depth Repair of Jointed
Full-depth patching is used to repair concrete slabs
which have distresses which extend through the
entire depth of the slab. These distresses include:
2. Corner break
3. Durability D cracking
Types of Overlays and Their Functions
Purposes of Overlay:
1. To correct surface deficiencies, such as:
a) To improve skid resistance
b) To enhance appearance
c) To reduce surface roughness
d) To improve surface drainage
e) To retard climate-related deter
Evaluation of Concrete Pavements
using the FWD - the Florida Experience
Challenge: Thermal gradients in the concrete may cause
the FWD deflections to vary when tests were run at
different times of the day.
Solution: Run FWD tests at times and locations
Recommended Procedures for
Estimation of Pavement Layer
Moduli by the Dynaflect
Byron Ruth et al.
1. Use modified Dynaflect Sensor Positions.
2. Measure air and pavement temperature. Pavement
temperature should be between 30 and 85 F.
To determine pavement material properties
(such as elastic modulus).
To determine a pavements structural
To locate inadequate subgrade support
condition (e.g. voids).
To evaluate joint condition.
Asphalt Institute Method for Design of
1. 20 25% Cracking
2. Rut Depth of 0.5 inch
1. Fatigue Cracking Criterion
(based on the results of AASHO Road Test
and laboratory fatigue data)
N = 18.4 (4.32 X 10-3 t 3.29 E-0.854)
Development of a Rational
Thickness Design Method
for Concrete Pavements
Analytical Tool Used:
FEACONS (Finite Element Analysis of CONcrete
Slabs) computer program
Factors considered by FEACONS:
1. Subgrade voids beneath slabs.
2. Effects of joints.
Performance of Concrete Pavements in Florida
Voids underneath the slab at the edge due to pumping
Transverse Cracking on I-10 Concrete Pavement
Transverse and Corner Cracking on I-10 with
Transverse Cracking on I-10 with Cement-Trea
REVIEW QUESTIONS FOR TEST NO.2
AASHTO DESIGN GUIDES FOR RIGID PAVEMENTS
(1) How were traffic, pavement design and pavement serviceability related to one another in the
performance equation for rigid pavements, which formed the basis for
REVIEW QUESTIONS FOR TEST NO. 3
NON-DESTRUCTIVE TESTING AND STRUCTURAL EVALUATION OF FLEXIBLE
(18) What properties of a flexible pavement can be determined from results of Dynaflect or
FWD tests, and how are these properties d