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Home > Publications > International Concrete Abstracts Portal
Showing 1-2 of 2 Abstracts search results
Document:
110-S03
Date:
January 1, 2013
Author(s):
Guohui Guo and Leonard M. Joseph
Publication:
Structural Journal
Volume:
110
Issue:
1
Abstract:
For post-tensioned (PT) concrete floors, shortening occurs due to elastic compression, concrete creep, concrete shrinkage, and temperature change. The longer the continuous concrete slab, the greater the cumulative shortening effect. More commonly, some restraints to shortening exist, such as shear walls and stocky columns. At best, restraint to shortening (RTS) can induce cracks and spalls that affect aesthetics and durability. At worst, it can affect structural safety. Therefore, appropriate models and procedures that can predict shortening are quite necessary. In the first part of this study, five concrete creep and shrinkage models are compared for both ultimate values and relative shortening rates. The B3 model is considered to be the most appropriate model. Adjustments to the B3 model are introduced by using equivalent concrete age to account for high early concrete strength frequently used in PT construction. Part II of this study covers detailed procedures to estimate PT concrete floor shortening.
DOI:
10.14359/51684326
107-M09
January 1, 2010
Brian N. Skourup and Ece Erdogmus
Materials Journal
107
Fiber-reinforced cementitious systems for concrete structures are increasing in popularity; however, fiber-reinforced mortar (FRM) mixtures for masonry applications have not been extensively studied. In this study, various FRM mixtures using polyvinyl alcohol (PVA) fibers and FRM-clay unit prisms are tested and resulting mechanical properties are discussed. The FRMs are developed specifically for masonry applications such as the rehabilitation, reconstruction, and strengthening of existing masonry structures; therefore, mixtures with low compressive strength and high ductility are desired. Results show that increased toughness, ductility, and energy absorption can be achieved using FRMs in masonry joints without significantly altering the compressive capacity or aesthetics of the structure. The results of the study point out the benefits of using FRMs in masonry applications in terms of improved mechanical characteristics, and provide valuable insight into effective FRM mixture design for masonry applications, suggested empirical formulas for modulus of rupture and modulus elasticity, and directions for future research.
10.14359/51663466
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