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Can the PQI be used instead of a nuclear density gauge? It will take 36 readings in the PQI to reach the same confidence interval as with 4 readings in the nuclear density gauge
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I took 3510 this Spring …What Can I do with it?
A collection of work related to what you learned (or should have) in 3510
Analysis of Data Using Statistics Field Density is a random variable
How can we measure it?
Nuclear Density Gauge Pavement Quality IndicatorPQI
vs.
Can the PQI be used instead of a nuclear density gauge?
f(x)
ZZ = 0 Z = +z1Z = -z2
12/2/ n
stxnstxP
It will take 36 readings in the PQI to reach the same confidence interval as with 4 readings in the nuclear density gauge
Analysis of Aggregate Properties Aggregates shape and gradation determine
its bearing capacity
Can it support a fully loadedSpace Shuttle?
Can Aggregate Support a fully loaded Space Shuttle?
19.0 mm Nominal Maximum Aggregate Size Gradation
0
20
40
60
80
100
Sieve Size to the 0.45 Power, mm
Cum
ulat
ive
Perc
ent P
assi
ng
Control PointsKSC
19.012.5 25.09.54.752.361.180.600
0.3000.0750.150
Gradations close to the maximum density line havemore contact points, thus are able to distribute the load
How to stop an airplane? Concrete can transforms kinetic
energy into deformation
Aereated Concrete High strength concrete is not for every one…
High Concentrations of Tricalcium Aluminate can be used for lightweight concrete
Visco-elastic Materials Absorb Energy
Buckling Restrained Braces (BRBs) prevent buildings from excessive deformations Are new designs adequate?
Buckling Restrained Braces
Force-Displacement (LVDT average)(150k SP1)
-300
-200
-100
0
100
200
300
-4 -3 -2 -1 0 1 2 3 4
Displacement (in.)
Forc
e (k
ips)
Energy caused by cyclic deformations induced during seismic events can be dissipated
Compatibility of Asphalt and Aggregates
Roads are affected by moisture damage Does Binder Grade affect performance?
Hamburg test to simulate behaviorPolyPhosporic Acid increases the bond between the polar asphalt molecules and the aggregate, thus decreasing the potential for moisture damage.
Provide a smooth surface Durable and capable of
withstanding traffic
Las Vegas Grand Prix (2007)
A special solvent-less emulsion was used to create a bonded wearing course
Cold In-Place Recycling Quick and cost-effective road preservation
City of Ogden
24th Street
Fracture MechanicsRecycled asphalt layer provides some protection against Reflective cracking
Representative Volume Element Can small asphalt mixture beams be used
for quality control of paving materials?
Simple Quicker testsThe bending beam rheometer (BBR) can be used to test smallasphalt mixture beams and provide for quality control of materialsduring production and laydown
Coefficient of Thermal ExpansionAs the temperature drops, the concrete contracts leading to cracking.
A new test was developed andevaluated to measure CTE
Emphasis in Materials?
Not a discipline on its own Transportation Structures Geotechnical Construction
Related Courses CVEEN 6920a: Construction Materials (S10?) CVEEN 7570: Advanced Materials (S10) CVEEN 5570: Pavement Design (F09)
