"In general, pavements may be classed as being either rigid or flexible. The term “rigid pavement”, as commonly used in the United States, is applied only to wearing surfaces constructed of portland-cement concrete. All other types of pavements are classed as “flexible”. A pavement constructed of portland-cement concrete is assumed to possess considerable flexural strength which will permit it to act as a beam and allow it to bridge any minor irregularities which may occur in the base on which it rests, hence the term “rigid”….
In view of the experience and information gathered in over 50 years of road building, one might expect to find precise and standardized methods for the design of portland-cement concrete pavements. Instead, nearly every state has different design practices. Because of increased usage and heavier loadings, what was once considered good design practice is now to some extent inadequate. The results of the increased usage and loadings is evident in the fact that pavements that were designed for a life expectancy of 20 to 25 years are being completely destroyed in approximately half that time….
It is the purpose of this investigation to determine, by tests conducted on normal pavement concretes placed on prepared subgrades, the daily cycles of length changes with temperature variation, and also to determine the longtime changes in length of slabs on subgrades with moisture and evaporation variables approximating those of normal highway slabs. Each slab will be subjected to a known, relatively constant, average intensity of prestress.
In accord with the above purpose, the primary objective of this project is to determine overall length changes for daily and seasonal cyclic changes of temperature and moisture on short sections of prestressed concrete slabs. The slabs will be placed in outside exposure on prepared highway subbases.
A secondary objective of this project is to investigate changes in one-directional warping measurements along the length of these slabs. This will be done under the different intensities of average known prestress for daily and seasonal changes in slab temperature and moisture"--Introduction, pages 1, 2, 5.
Carlton, E. W.
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
Missouri School of Mines and Metallurgy
v, 107 pages
© 1957 John L. Best, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Pavements, Prestressed concrete -- Creep
Prestressed concrete -- Creep
Concrete slabs -- Testing
Strains and stresses
Print OCLC #
Electronic OCLC #
Link to Catalog Recordhttp://laurel.lso.missouri.edu/record=b2614122~S5
Best, John, "Investigation of length changes in prestressed concrete slabs with outside exposures" (1957). Masters Theses. 2183.