The influence of aggregate particles on the local strain distribution and fracture mechanism of cement paste during drying shrinkage and loading to failure

1969 ◽  
Vol 2 (1) ◽  
pp. 73-85 ◽  
Author(s):  
Mc Creath ◽  
J. B. Newman ◽  
K. Newman
Keyword(s):  
Cement Paste ◽  
Fracture Mechanism ◽  
Strain Distribution ◽  
Drying Shrinkage ◽  
Local Strain ◽  
Aggregate Particles

scholarly journals Local Strain Distribution in ZnO Microstructures Visualized with Scanning Nano X‐Ray Diffraction and Impact on Electrical Properties

2021 ◽  
pp. 2100201
Author(s):  
Philipp Jordt ◽  
Stjepan B. Hrkac ◽  
Jorit Gröttrup ◽  
Anton Davydok ◽  
Christina Krywka ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Strain Distribution ◽  
Local Strain ◽  
X Ray Diffraction ◽  
X Ray

Effect of Aggregate on Drying Shrinkage of Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 701-708 ◽  
Author(s):  
Ru Mu ◽  
Wen Ling Tian ◽  
Yong Gang Guo
Keyword(s):  
Cement Paste ◽  
Volume Fraction ◽  
Drying Shrinkage ◽  
Moisture Diffusion ◽  
Moisture Loss ◽  
Normal Concrete ◽  
New Model ◽  
Model Code

A modified version of an existing drying shrinkage model developed by the authors is proposed which incorporates the influence of the aggregate on the process of shrinking. Whereas it is traditionally thought that the aggregate restrains the deformation of the cement paste and hence the shrinkage of the concrete, in this paper, the effect of aggregate on shrinkage is better represented by considering the effect of the aggregate on moisture diffusion. It is suggested that the presence of the aggregate modifies the diffusion of moisture which governs the moisture loss and hence the drying of concrete. Also, as the volume fraction of the aggregate in a normal concrete is about 75% or more, the shrinkage of the cement paste is ‘diluted’ by the aggregate in the concrete. Taking into account these effects, this new diffusion based shrinkage model has been proposed. To assess the accuracy of the new model the shrinkage of two concrete mixes is predicted and compared with the measured shrinkage of these mixes. Comparisons are also drawn with the shrinkage predicted using the Model Code 1990 (MC90). It was observed that the new model proposed here predicts the shrinkage of the concrete mixes more accurately than the MC90 model, particularly at early ages.

Characterization of Local Strain Distribution in Zircaloy-4 and M5® Alloys

2009 ◽  
pp. 181-181-12
Author(s):  
Kamal Elbachiri ◽  
Pascal Doumalin ◽  
Jéro^me Crépin ◽  
Michel Bornert ◽  
Pierre Barberis ◽  
...  
Keyword(s):  
Strain Distribution ◽  
Local Strain

The local strain distribution in bilayer materials: a multiscale study

Nanoscale ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 6456-6461
Author(s):  
Zongrui Pei ◽  
Sai Mu ◽  
Wenmei Ming
Keyword(s):  
Physical Properties ◽  
Strain Distribution ◽  
Local Strain ◽  
Geometric Changes

Recent studies show that small geometric changes can result in dramatic changes in physical properties and need to be carefully evaluated.

A New Approach to Model Heterogonous Recrystallization Kinetics Based on the Natural Inhomogeneity of Deformation

2007 ◽  
Vol 558-559 ◽  
pp. 1139-1144 ◽  
Author(s):  
Hai Wen Luo ◽  
Lian Zi An ◽  
Hong Wei Ni
Keyword(s):  
Standard Deviation ◽  
Normal Distribution ◽  
Strain Distribution ◽  
Distribution Density ◽  
Local Strain ◽  
Avrami Exponent ◽  
Recrystallization Process ◽  
Rate Parameter ◽  
New Approach ◽  
Modified Equation

The classical JMAK equation was modified by combination with distribution density of the rate parameter k, which was deduced from a normal distribution of local strain. The modified equation is able to calculate the JMAK plots and the average Avrami exponent to characterize the entire heterogeneous recrystallization process. This new extension can successfully describe the relevant experimental observations, such as a smaller exponent than the basic JMAK theory predicts, and a decreasing slope of JMAK plots with the proceeding recrystallization. Moreover, it reveals that the Avrami exponent observed experimentally should significantly decrease with the increasing standard deviation of local strain distribution. In addition, it has a great potential to explain why most of experimentally observed values of Avrami exponents are less than 2 and why the Avrami exponent is insensitive to temperature and deformation conditions when the real standard deviation of local strain distribution in deformed metals is known.

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