12 research outputs found
On numerical modeling of couple heat, air and moisture transfer through multilayered walls
This paper reports on numerical modeling of heat, air, and moisture transfer
through multilayered walls. Building materials are often subjected to temporal climatic
variations, which can induce a transfer of heat and moisture through the walls of the building
and the foundation soil. These materials are generally considered as porous media. The
coupled heat, air and moisture transfer in building materials is of paramount importance in the
construction area. In this way, a mathematical model has been elaborated and validated using
a benchmark example. Here, we aim to determine the energy losses. The capillary pressure is
considered as potential moisture which represents both the transport of vapor and liquid
phases of the water. Basing on basic functions of partial differential equations, one can
convert certain measurable properties of porous media as coefficients depending on the
temperature and the capillary pressure. The results obtained compare favorably with other
available in the literature
CRITICAL UNDRAINED SHEAR STRENGTH OF LOOSE-MEDIUM SAND-SILT MIXTURES UNDER MONOTONIC LOADINGS
Empirical relationships are developed for estimating the undrained critical shear strength
based on experimental triaxial tests under monotonic loadings. The effect of fines content
on the undrained shear strength is analyzed for different combinations of density states.
The parametric study indicates that in terms of the soil void ratio and fines content properties,
the undrained critical shear strength may increase, or decrease as the amount of fines
content increases, consequently showing vulnerability to liquefaction influenced by the fines
content percentage. A series of monotonic undrained triaxial tests have been undertaken on
a reconstituted saturated sand-silt mixtures specimen. Beyond 30% of fines content, it is
shown that a fraction of silt participates in the soil skeleton chain force. In this context,
the concept of the equivalent intergranular void ratio may be an appropriate parameter to
express the critical shear strength of the soil under investigation. This parameter is able
to control the undrained shear strength of non plastic silt and sand mixtures for different
density states
Critical undrained shear strength of loose-medium sand-silt mixtures under monotonic loadings
Empirical relationships are developed for estimating the undrained critical shear strength
based on experimental triaxial tests under monotonic loadings. The effect of fines content
on the undrained shear strength is analyzed for different combinations of density states.
The parametric study indicates that in terms of the soil void ratio and fines content properties,
the undrained critical shear strength may increase, or decrease as the amount of fines
content increases, consequently showing vulnerability to liquefaction influenced by the fines
content percentage. A series of monotonic undrained triaxial tests have been undertaken on
a reconstituted saturated sand-silt mixtures specimen. Beyond 30% of fines content, it is
shown that a fraction of silt participates in the soil skeleton chain force. In this context,
the concept of the equivalent intergranular void ratio may be an appropriate parameter to
express the critical shear strength of the soil under investigation. This parameter is able
to control the undrained shear strength of non plastic silt and sand mixtures for different
density states
On numerical modeling of couple heat, air and moisture transfer through multilayered walls
This paper reports on numerical modeling of heat, air, and moisture transfer
through multilayered walls. Building materials are often subjected to temporal climatic
variations, which can induce a transfer of heat and moisture through the walls of the building
and the foundation soil. These materials are generally considered as porous media. The
coupled heat, air and moisture transfer in building materials is of paramount importance in the
construction area. In this way, a mathematical model has been elaborated and validated using
a benchmark example. Here, we aim to determine the energy losses. The capillary pressure is
considered as potential moisture which represents both the transport of vapor and liquid
phases of the water. Basing on basic functions of partial differential equations, one can
convert certain measurable properties of porous media as coefficients depending on the
temperature and the capillary pressure. The results obtained compare favorably with other
available in the literature