Open Access
Criteria for rational prediction of creep and shrinkage of concrete
Zdenek P. Bazant
- Vol. 3, pp 61-89
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TLDR
In this paper, the authors discuss the problem of formulation and evaluation of a prediction model for creep and shrinkage of concrete, and propose three criteria: (1) after optimizing its coefficients, the model should be capable of providing close fits of the individual test data covering a broad range of times, ages, humidities, thicknesses etc.Abstract:
The paper discusses the problem of formulation and evaluation of a prediction model for creep and shrinkage of concrete. Verification by comparisons to a few subjectively selected data sets is no longer justifiable because computers have made statistical comparisons to the complete existing data bank easy. However, statistics based on the data bank are insufficient. There are three further criteria : (1) After optimizing its coefficients, the model should be capable of providing close fits of the individual test data covering a broad range of times, ages, humidities, thicknesses, etc. ; (2) the model should have a rational, physically justified theoretical basis, and (3) should allow good and easy extrapolation of the short-time tests into long times, high ages at loading, large thicknesses etc. The last criterion is very important because good long-time predictions can be achieved only through updating based on short-time data for the given particular concrete. Various aspects of the B3 and GZ models recently considered by ACI Committee 209, as well as some aspects of the CEF-FIP model, are briefly analyzed in the light of these criteria, clarifying the way to move ahead.read more
Citations
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Journal ArticleDOI
Effects of desiccation on mechanical behaviour of concrete
TL;DR: In this article, an experimental characterisation and numerical modelling of coupled behaviors between drying shrinkage and plastic damage in concrete is presented. But the results are relevant with respect to the importance of drying process in the durability study of concrete structures.
Journal ArticleDOI
Identification of viscoelastic C-S-H behavior in mature cement paste by FFT-based homogenization method
Vít Šmilauer,Zdenek P. Bazant +1 more
TL;DR: A powerful and robust numerical homogenization method based on fast Fourier transform (FFT) is formulated to identify the viscoelastic behavior of calcium silicate hydrates (C-S-H) in hardened cement paste from its heterogeneous composition as discussed by the authors.
Journal ArticleDOI
Induced anisotropic permeability due to drying of concrete
TL;DR: In this paper, the authors measured drying shrinkage and loss of mass in time on prismatic samples while uniaxial compression tests were performed on cylindrical samples and concluded that induced anisotropy is clearly observable in permeability, which is also increasing with drying time.
Journal ArticleDOI
Finite-Element Simulation of Hydration and Creep of Early-Age Concrete Materials
Yao Zhou,Dan Meng,Yuan Feng Wang +2 more
TL;DR: In this paper, the thermal stress and tensile creep of early-age concrete that occur during the exothermic chemical reactions between water and cement may result in harmful cracks, and an equation for evaluating hydration degree is presented, and a finite-element program for a thermal analysis of hydration heat is developed.
Journal ArticleDOI
Load-dependent deformation and shrinkage in hydraulic lime mortars
Richard J Ball,Geoffrey C. Allen +1 more
TL;DR: In this article, the deformation of an NHL3.5 natural hydraulic lime mortar has been investigated through creep and drying shrinkage under load, and a reversible relationship between changes in specimen dimension and relative humidity has been established.
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