Diffusion coefficient and infinitesimal shrinkage strain of a Strain-Hardening Cement-Based Composite (SHCC) determined by inverse analysis of experiments

2021 ◽  
Vol 124 ◽  
pp. 104259
Author(s):  
Penggang Wang ◽  
Beate Villmann ◽  
Xiaofeng Han ◽  
Volker Slowik ◽  
Tiejun Zhao
Keyword(s):  
Diffusion Coefficient ◽  
Strain Hardening ◽  
Inverse Analysis ◽  
Shrinkage Strain

Influence of Shrinkage Compensation in Cement Matrix on the Tension Stiffening of Reinforced Strain-Hardening Cement Composite (SHCC) Tension Ties

2012 ◽  
Vol 204-208 ◽  
pp. 3660-3663
Author(s):  
Hyun Do Yun ◽  
Su Chang Wang ◽  
Chang Gun Cho
Keyword(s):  
Strain Hardening ◽  
Shrinkage Strain ◽  
Cement Composite ◽  
Cement Matrix ◽  
Tension Stiffening ◽  
Cracking Behavior ◽  
Rich Mixture ◽  
Cyclic Tension ◽  
Shrinkage Compensation ◽  
Deformed Bar

This paper investigates the interaction of structural deformed bar reinforcement and strain hardening cement composite (SHCC). The SHCC shows excellent mechanical properties such as multiple cracks and strain-hardening. Generally, SHCC material consists of cement, silica sand and fibers and is rich mixture without aggregate. Rich mixture leads to much shrinkage strain of SHCC material. In this research, the replacement of a part of cement by expansive admixture (EXA) is considered as an alternative to compensate the shrinkage strain of SHCC material. This paper presents the experimental results of tests on tension stiffening and cracking behavior of reinforced conventional and shrinkage-compensating SHCC ties in monotonic and cyclic tension. Each tie specimen had a square cross-section dimension of 100 x 100mm and length of 1,500mm. A 16mm diameter deformed bar was embedded centrally and mixed with 1.5% hybrid fibers composed of Polyethylene(PE) and Steel core(SC). The test results indicated that the shrinkage compensation of cement matrix in SHCC improve the tension stiffening and cracking behavior of reinforced SHCC ties in monotonic and cyclic tension loading.

Fast Inverse-Analysis Calculation of Diffusion Coefficient for Salt Transport in Porous Building Materials

2015 ◽  
Vol 1126 ◽  
pp. 117-122 ◽  
Author(s):  
Igor Medveď ◽  
Zbyšek Pavlík ◽  
Milena Pavlíková ◽  
Robert Černý
Keyword(s):  
Diffusion Coefficient ◽  
Inverse Analysis ◽  
Analytical Approach ◽  
Building Materials ◽  
Salt Transport ◽  
Porous Building Materials ◽  
Advection Diffusion ◽  
Analysis Calculation ◽  
Salt Diffusion

An analytical approach to the determination of a varying salt diffusion coefficient is discussed. It is argued that the approach is fast and reliable and can be very convenient in various civil engineering applications dealing with the transport of salts in porous building materials. The advection-diffusion model of Bear and Bachmat is used to describe the salt transport, and the Bolztmann-Matano inverse analysis is applied to calculate the salt diffusion coefficient. Possible extensions to other models of transport are pointed out. The results are applied to a sandstone from the Msene quarry, Czech Republic.

Brief-Measurements of Vapor Diffusion Coefficient

1954 ◽  
Vol 46 (11) ◽  
pp. 47-49 ◽  
Author(s):  
C.Y. Lee ◽  
C.R. Wilke
Keyword(s):  
Diffusion Coefficient ◽  
Vapor Diffusion
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