Three-dimensional mesoscale modeling of foamed cement paste using peridynamics

2021 ◽  
Vol 310 ◽  
pp. 125230
Author(s):  
Fengrui Rao ◽  
Zhen Zhang ◽  
Guanbao Ye
Keyword(s):  
Cement Paste ◽  
Three Dimensional ◽  
Mesoscale Modeling

X-Ray Microtomography of an Astm C109 Mortar Exposed to Sulfate Attack

1994 ◽  
Vol 370 ◽  
Author(s):  
D.P. Bentz ◽  
Nicos. S. Martys ◽  
P. Stutzman ◽  
M. S. Levenson ◽  
E.J. Garboczi ◽  
...  
Keyword(s):  
Cement Paste ◽  
Sodium Sulfate ◽  
Three Dimensional ◽  
Sulfate Solution ◽  
Sulfate Attack ◽  
Sodium Sulfate Solution ◽  
Mortar Sample ◽  
Air Voids ◽  
X Ray ◽  
Dimensional Image

AbstractX-ray microtomography can be used to generate three-dimensional 5123 images of random materials at a resolution of a few micrometers per voxel. This technique has been used to obtain an image of an ASTM C109 mortar sample that had been exposed to a sodium sulfate solution. The three-dimensional image clearly shows sand grains, cement paste, air voids, cracks, and needle-like crystals growing in the air voids. Volume fractions of sand and cement paste determined from the image agree well with the known quantities. Implications for the study of microstructure and proposed uses of X-ray microtomography on cement-based composites are discussed.

Low Temperature Fabrication of Three-Dimensional Ceramic Substrate by Using Inorganic Alkali Activated Aluminosilicate Cement Paste for UV-LED Packaging

2018 ◽  
Author(s):  
Hao Cheng ◽  
Zi Zhou Yang ◽  
Yang Peng ◽  
Yun Mou ◽  
Ming Xiang Chen
Keyword(s):  
Shear Strength ◽  
Low Temperature ◽  
Cement Paste ◽  
Three Dimensional ◽  
High Strength ◽  
Ceramic Substrate ◽  
Curing Temperature ◽  
Thermal Reliability ◽  
Uv Led ◽  
Alkali Activated

In this work, a low temperature method is proposed for the economical fabrication of three-dimensional (3D) ceramic substrate for Ultraviolet Light-Emitting Diodes (UV-LED) packaging. The 3D ceramic substrate using the inorganic alkali activated aluminosilicate cement paste (IAAACP) is molded by sacrificing the patterned wax mold. By controlling the viscosity, milling time, and curing temperature the of the IAAACP, the high strength 3D ceramic substrate is achieved, the corresponding shear strength reaches to 12.5MPa. After thermal shock and heat resistant test, the shear strength changed slightly, indicating the 3D ceramic substrate has excellent thermal reliability. These experimental results indicate that the prepared 3D ceramic substrate has a potential application for UV-LED packaging.

scholarly journals Calculation of crack stress density of cement base materials

2018 ◽  
Vol 38 ◽  
pp. 03058
Author(s):  
Sui Chun-e
Keyword(s):  
Fracture Surface ◽  
Cement Paste ◽  
Fracture Stress ◽  
Polynomial Function ◽  
Three Dimensional ◽  
Effective Area ◽  
Fracture Load ◽  
Mineral Admixtures ◽  
Base Materials ◽  
The Relationship

In this paper, the fracture load of cement paste with different water cement ratio, different mineral admixtures, including fly ash, silica fume and slag, is obtained through experiments. the three-dimensional fracture surface is reconstructed and the three-dimensional effective area of the fracture surface is calculated. the effective fracture stress density of different cement paste is obtained. The results show that the polynomial function can accurately describe the relationship between the three-dimensional total area and the tensile strength

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