Drying and Cracking Effects in Box‐Girder Bridge Segment

Bažant, Zdeněk P.; Kř́ıstek, Vladiḿır; Vítek, Jan L.

doi:10.1061/(asce)0733-9445(1992)118:1(305)

Cited by 27 publications

(11 citation statements)

References 17 publications

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“…7,12,13 For a given cross-section and length of time, Bazant and co-workers expressed the variation of differential drying shrinkage and the variation of stressinduced shrinkage in terms of the variation of relative humidity,˜H. [14][15][16] In the proposed equations, k, one of the most important factors, is expressed as follows…”

Section: Analysis Of the Progress Of Moisture Diffusionmentioning

confidence: 99%

Effect of differential moisture distribution on the shortening of steel-reinforced concrete columns

Seol

Kwon

Yang

et al. 2008

Magazine of Concrete Research

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This paper presents experimental and analytical studies on the causes of differences between reinforced concrete (RC) and steel-reinforced concrete (SRC) column behaviour with a focus on moisture diffusion. The results of experiments on the long-term behaviour of RC and SRC columns have shown that the shortening of SRC columns tends to be overestimated by the methods generally used to predict the shortening of RC columns. Moisture diffusion coefficient and surface factor of the concrete used in the SRC column specimens were determined from experiments and an analysis on moisture diffusion was conducted to determine the progress of moisture diffusion in the SRC column specimens. The analytical results indicated that the progress of moisture diffusion in SRC columns is quite different from that in RC columns. Analyses on differential drying shrinkage and differential drying creep were also performed by analysing the progress of moisture diffusion at each point in an SRC column section. The results indicated that obstruction of the moisture diffusion route causes a reduction in both drying shrinkage and drying creep in the SRC columns. The differential moisture distribution should therefore be taken into account in order accurately to predict SRC column shortening.

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Section: Analysis Of the Progress Of Moisture Diffusionmentioning

confidence: 99%

Effect of differential moisture distribution on the shortening of steel-reinforced concrete columns

Seol

Kwon

Yang

et al. 2008

Magazine of Concrete Research

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“…A separate area in the use of sliding joints is prestressing of structures. Sliding joint allows free deformation during prestressing, which allows to introduce more prestressing into the structure (Bazant, Kristek, & Vitek, 1992;Bilcik & Sonnenschein, 2018;Bradac, 1991Bradac, , 1996Cajka, 2005;Cajka & Manasek, 2005;Hornikova, Foglar, Kolisko, & Kolar, 2016;Janulikova, Cajka, Mateckova, & Stara, 2012;Sekanina & Cajka, 2009;Schweighofer & Kollegger, 2013;Smirakova, 2014).…”

Section: Introductionmentioning

confidence: 99%

Volume changes of concrete in interaction with sliding joint

Kropáček

Čajka

Mynarcik

2019

Modern Building Materials, Structures and Techniques (MBMST)

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The paper describes volume changes of cement plain concrete and steel fiber reinforced concrete with strength class C 30/37 in interaction with sliding joints. In the research experiment was performed large-dimensional specimens, on which volume changes were measured using string strain gauges. Below the large-dimensional specimens were designed sliding joints. The specimens were placed in a controlled laboratory environment and in an outdoor environment to simulate real conditions during construction and the measurements were carried out for several months. Volume changes of the concrete were compared to each other and significant influence of the sliding joints was observed. Significant influence on the development of volume changes also has dispersed reinforcement. Another part of the article is a comparison of experimental results with calculation models that allow to calculate the final shrinkage of concrete. Comparison results of volume changes with calculation models is important for demonstrating the effect of sliding joint, as currently valid calculation models do not consider the influence of subsoil and sliding joints, and the results are different as expected. For comparison model B4 (Bazant, 2015), model from technical standard EN 1992-1-1 (CSN EN 1992-1-1, 2006), model from fib model code 2010 (FIB, 2010) and model ACI (ACI, 2008) are used. The paper describes a unique experiment dealing with the influence of sliding joint on the development of volume changes of concrete from beginning of setting and hardening of concrete under precisely defined conditions, that allow comparison with calculation models and thus points to the shortcomings of the building practice.

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“…The compatibility of elements prevents free shrinkage, which results in the development of ein Wort, even in elements that are completely free to deform. In order to evaluate such stresses, it is essential to investigate mutual relations between drying of concrete, shrinkage, creep, etc …”

Section: Introductionmentioning

confidence: 99%

“…In order to evaluate such stresses, it is essential to investigate mutual relations between drying of concrete, shrinkage, creep, etc. 4,14 Shrinkage of concrete is a complex phenomenon affected by numerous effects, particularly concrete composition, specimen size, environmental conditions and local temperature and humidity at individual points of the concrete member. During past decades, intense research effort has been focused on shrinkage of concrete.…”

Section: Introductionmentioning

confidence: 99%

Drying shrinkage of concrete elements

Vinkler

Vítek

2017

Structural Concrete

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The paper deals with shrinkage of large concrete specimens. The segments of walls were cast with thicknesses of 200 mm, 400 mm and 800 mm. Four sides were sealed in order to simulate the drying of infinite walls of different thicknesses. The elements were equipped with vibrating wire strain gauges to measure strains inside the elements, and strains were recorded for a period of 6 months in vertical as well as in horizontal directions. The wall segments are stored in a laboratory. The relative humidity and temperature of the environment are not controlled, but recorded very closely. Additional tests were performed. The concrete compression strength was measured on cubes and uniaxial shrinkage is measured on standard cylinders using embedded vibrating wire strain gauges. The cylinders are stored in three different environments; in the laboratory and in the rooms with a controlled relative humidity of 65% and 100%, respectively. A comparison of measured shrinkage is provided against various shrinkage models (Model Code 2010, Eurocode 2, Model B3, Model B4, Model B4s and Model ACI209R-92). K E Y W O R D Sautogenous shrinkage, cylinders, drying shrinkage, relative humidity, shrinkage models, shrinkage of concrete, size effect, wall segments

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Drying and Cracking Effects in Box‐Girder Bridge Segment

Cited by 27 publications

References 17 publications

Effect of differential moisture distribution on the shortening of steel-reinforced concrete columns

Effect of differential moisture distribution on the shortening of steel-reinforced concrete columns

Volume changes of concrete in interaction with sliding joint

Drying shrinkage of concrete elements

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