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Author: Publisher: ISBN: Category : Pavements Languages : en Pages : 204
Book Description
Durability Cracking (D-cracking) is the progressive deterioration of Portland cement concrete (PCC) and is normally caused by winter freeze-thaw cycling. The PCC coarse aggregate source has been identified as causing well designed mixes to develop D-cracking. A common rehabilitation procedure for D-cracked PCC pavements is to overlay the PCC with asphalt concrete (AC). This renews the surface, but little is known about the long term effect of AC overlays on D-cracked PCC pavements. Specifically, will an AC overlay stop the progression of D-cracking, or accelerate it. The primary climatic factors responsible for D-cracking are moisture and temperature. Finite-difference transient flow computer moisture movement modeling as well as field instrumentation and laboratory measurements indicated that AC overlays have negligible effect on the PCC pavement moisture regime. This is due to the extremely low hydraulic conductivity of PCC. Evaporative drying of the PCC extends less than 2 in. into the PCC pavement. The effect of AC overlays on the PCC temperature regime was evaluated by finte-difference heat transfer computer modeling. AC overlays were found to decrease the number of freeze-thaw cycles and the rate of cooling in PCC pavements. The cooling rate at the top of an 8-in. PCC pavement in the St. Louis, Missouri area was decreased from 1.19 to 0.24 F°/hr by a 4-in. overlay.
Author: Publisher: ISBN: Category : Pavements Languages : en Pages : 204
Book Description
Durability Cracking (D-cracking) is the progressive deterioration of Portland cement concrete (PCC) and is normally caused by winter freeze-thaw cycling. The PCC coarse aggregate source has been identified as causing well designed mixes to develop D-cracking. A common rehabilitation procedure for D-cracked PCC pavements is to overlay the PCC with asphalt concrete (AC). This renews the surface, but little is known about the long term effect of AC overlays on D-cracked PCC pavements. Specifically, will an AC overlay stop the progression of D-cracking, or accelerate it. The primary climatic factors responsible for D-cracking are moisture and temperature. Finite-difference transient flow computer moisture movement modeling as well as field instrumentation and laboratory measurements indicated that AC overlays have negligible effect on the PCC pavement moisture regime. This is due to the extremely low hydraulic conductivity of PCC. Evaporative drying of the PCC extends less than 2 in. into the PCC pavement. The effect of AC overlays on the PCC temperature regime was evaluated by finte-difference heat transfer computer modeling. AC overlays were found to decrease the number of freeze-thaw cycles and the rate of cooling in PCC pavements. The cooling rate at the top of an 8-in. PCC pavement in the St. Louis, Missouri area was decreased from 1.19 to 0.24 F°/hr by a 4-in. overlay.
Author: F. Ellyin Publisher: Springer Science & Business Media ISBN: 9400915098 Category : Technology & Engineering Languages : en Pages : 484
Book Description
Fatigue failure is a multi-stage process. It begins with the initiation of cracks, and with continued cyclic loading the cracks propagate, finally leading to the rupture of a component or specimen. The demarcation between the above stages is not well-defined. Depending upon the scale of interest, the variation may span three orders of magnitude. For example, to a material scientist an initiated crack may be of the order of a micron, whereas for an engineer it can be of the order of a millimetre. It is not surprising therefore to see that investigation of the fatigue process has followed different paths depending upon the scale of phenomenon under investigation. Interest in the study of fatigue failure increased with the advent of industrial ization. Because of the urgent need to design against fatigue failure, early investiga tors focused on prototype testing and proposed failure criteria similar to design formulae. Thus, a methodology developed whereby the fatigue theories were proposed based on experimental observations, albeit at times with limited scope. This type of phenomenological approach progressed rapidly during the past four decades as closed-loop testing machines became available.
Author: Huang Yuan Publisher: Springer Science & Business Media ISBN: 3540458824 Category : Science Languages : en Pages : 318
Book Description
In this book a systematic discussion of crack problems in elastic-plastic materials is presented. The state of the art in fracture mechanics research and assessment of cracks is documented, with the help of analytic, asymptotic methods as well as finite element computations. After a brief introduction to fracture mechanics, the two-parameter concept for stationary cracks is studied in addition to the issues in three-dimensional crack fields under coupling with strong out-of-plane effects. Cracks along interfaces and crack growth problems under mixed mode conditions are also treated. A systematic study of stress singularities for different notches is accompanied by detailed finite element computations.
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Author: 
Author: F. Ellyin
Author: Lawrence J. Kaetzel
Author: Huang Yuan
Author: Thomas Richard Brussat
Author: 
Author: J. B. Chang
Author: Patrick James Barosh
Author: D. S. Dawicke
Author: J. B. Chang