scholarly journals Mechanical Characteristics of Cement Mortar at Low Temperature

1980 ◽  
Vol 96 (1103) ◽  
pp. 7-12
Author(s):  
Kunihisa KATSUYAMA ◽  
Michio KURIYAGAWA ◽  
Shinzo KATO
Keyword(s):  
Low Temperature ◽  
Mechanical Characteristics ◽  
Cement Mortar

Characteristics of Low Temperature Degradation Free ZTA for Artificial Joint

2014 ◽  
Vol 631 ◽  
pp. 18-22 ◽  
Author(s):  
Junji Ikeda ◽  
Takayuki Murakami ◽  
Takayoshi Shimozono ◽  
Reiji Watanabe ◽  
Mikio Iwamoto ◽  
...  
Keyword(s):  
Low Temperature ◽  
Phase Stability ◽  
Mechanical Characteristics ◽  
Bending Strength ◽  
Accelerated Aging ◽  
Ceramic Materials ◽  
Wear Property ◽  
Artificial Joint ◽  
Four Point Bending ◽  
Bearing Materials

Low temperature degradation free Zirconia toughened alumina (ZTA) has been developed. It is reported that ZTA has higher mechanical strength compared to alumina due to the stress induced transformation and spontaneously transformation of zirconia phase on some ZTA have been occurred. For achieving the higher reliability of artificial joint prosthesis alternative to alumina and other ceramic materials, it is necessary to improve and validate the both mechanical characteristics and phase stability at the same time. We evaluated that microstructure, mechanical characteristics and phase stability of newly developed ZTA (BIOCERAM®AZUL). It was confirmed that four-point bending strength and weibull modulus were extreamly high, and ZTA has higher reliability. There were no significant changes and deterioration in four-point bending strength, crystal structure and wear property with and without accelerated aging test. Newly developed ZTA not only with high mechanical characteristics but also with phase stability could be quite useful as bearing materials in artificial joints for longer clinical use.

scholarly journals Modification and in-place mechanical characteristics research on cement mortar with fly ash and lime compound admixture in high chlorine environment

2019 ◽  
Vol 8 (1) ◽  
pp. 1451-1460 ◽  
Author(s):  
Bingqian Yan ◽  
Kouame Joseph Arthur Kouame ◽  
Wensheng Lv ◽  
Peng Yang ◽  
Meifeng Cai
Keyword(s):  
Fly Ash ◽  
Mechanical Characteristics ◽  
Cement Mortar

scholarly journals Viscosity and Antiwashout Properties of Cement Mortar at Low Temperature Seawater Environment

2014 ◽  
Vol 26 (6) ◽  
pp. 1595-1598
Author(s):  
Heon Chang Kim ◽  
In-Kyu Jang ◽  
Seung-Kyu Park
Keyword(s):  
Low Temperature ◽  
Cement Mortar ◽  
Seawater Environment

scholarly journals Mechanical Characteristics and Failure Prediction of Cement Mortar with a Sandwich Structure

Minerals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 143 ◽  
Author(s):  
Xuesheng Liu ◽  
Qingheng Gu ◽  
Yunliang Tan ◽  
Jianguo Ning ◽  
Zhichuang Jia
Keyword(s):  
Sandwich Structure ◽  
Inflection Point ◽  
Turning Point ◽  
Mechanical Characteristics ◽  
Cement Mortar ◽  
Fracture Propagation ◽  
Failure Prediction ◽  
B Value ◽  
Sandwich Materials ◽  
Ae Counts

It is necessary to master the mechanical properties and failure prediction of the composite of mortar and rock block in a mined-out area. In this study, uniaxial compression and acoustic emission (AE) synchronous tests of mortar specimens with different sandwich materials and cement–sand ratios were carried out. The results showed that the compressive strength and elastic modulus of mortar specimens increased with an increase in the cement–sand ratio and the stiffness of the sandwich material. The AE counts and energy of mortar specimens with a high-stiffness sandwich material were maximum when they were destroyed. The b value, a number that reflects the extent of fracture propagation, decreased first and then increased with the increase in strain. The inflection point of the b value can be taken as the indication of the imminent failure of the mortar. A method for determining the b value at the turning point was proposed and verified.

Influence of Temperature on the Hydration Heat of Polymer Modified Mortars

2013 ◽  
Vol 687 ◽  
pp. 130-135
Author(s):  
Si Feng Liu ◽  
Si Jun Guo ◽  
Pei Ming Wang
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Vinyl Acetate ◽  
Cement Mortar ◽  
Ethylene Vinyl Acetate ◽  
Hydration Heat ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Effects Of Temperature ◽  
Isothermal Calorimeter

The hydration heat of polymer modified mortar were measured at 5°C、10°C、20°C and 40°C using Multi-channel Isothermal calorimeter. The effects of temperature on hydration heat of polymer modified mortars with 0.1% methyl hydroxylpropyl cellulose (MHPC), 3% ethylene vinyl acetate (EVA) and 0.1%MHPC+3%EVA were investigated. The curves of hydration heat show that the polymer reduces the hydration heat of mortars and it is related to the temperature. The effects will be more and more remarkable with the increasing of temperature; Temperature also affects the exothermic rate peak of polymer modified mortars. The exothermic rate peak of polymer modified mortar at low temperature is almost equal to that of the ordinary cement mortar. However, it is obviously lower than that of ordinary cement mortar at high temperature ; The time to the exothermic rate peak of polymer modified mortar is also related to the temperature.

Wear and Corrosion Resistance of Low Temperature Degradation Free ZTA for Artificial Joint

2016 ◽  
Vol 720 ◽  
pp. 296-300 ◽  
Author(s):  
Junji Ikeda ◽  
Takayuki Murakami ◽  
T. Sasaki ◽  
T. Shimozono ◽  
Y. Shouyama ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Low Temperature ◽  
Mechanical Characteristics ◽  
Artificial Joint ◽  
Clinical Use ◽  
Spontaneous Transformation ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance ◽  
Joint Prostheses

Low-temperature-degradation-free (LTD-free) zirconia-toughened alumina (ZTA) has been developed as an alternative to alumina and zirconia. It has been reported that ZTA has more beneficial mechanical characteristics than alumina, because of the stress-induced transformation and the spontaneous transformation of the zirconia phase that occurs for some ZTA in a hydrothermal environment. To achieve high-reliability artificial-joint prostheses, it is necessary to improve both the mechanical characteristics and phase stability of the joint material simultaneously. Thus, in this study, we evaluate the wear characteristics and corrosion resistance of LTD-free ZTA using a hip wear simulator, so as to confirm the long-term stability and reliability of this material in clinical use. The ZTA with advantageous mechanical characteristics used in this study has extremely high wear and corrosion resistance. Therefore, this ZTA could be quite useful as a bearing material in artificial joints for longer-term clinical use. It is also confirmed that the newly developed LTD-free ZTA is extremely stable under sliding conditions. Thus, it can be expected that the initial superior surface characteristics will be maintained through long-term clinical use.

scholarly journals Research on Crack Resistance of Semi-flexible Pavement Materials

2021 ◽  
Vol 248 ◽  
pp. 01020
Author(s):  
Wu Jiahong
Keyword(s):  
Low Temperature ◽  
Crack Resistance ◽  
Influencing Factors ◽  
Cement Mortar ◽  
Orthogonal Design ◽  
Flexible Pavement ◽  
Volume Stability ◽  
Pavement Materials ◽  
The Matrix ◽  
Matrix Porosity

Semi-flexible pavement has been widely used in China's road construction due to its excellent rutting resistance. Due to the large difference in volume stability between the matrix asphalt mixture and the cement mortar, the internal stress of the semi-flexible pavement material is concentrated and cracking is likely to occur. To explore the influence of different Influencing factors on the cracking resistance of semi-flexible pavement materials. This paper used the orthogonal design method to design the mix ratio of ordinary cement mortar. On this basis, admixtures (silica fume, ordinary emulsified asphalt, water-based epoxy resin) were added to prepare special cement mortar. Then, using cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type as the influencing factors, this article has studied his influence on the crack resistance of semi-flexible pavement materials. Tests show that cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type have varying degrees of influence on the crack resistance of semi-flexible pavement. The effect of matrix porosity on low temperature crack resistance is the greatest, followed by asphalt and cement mortar types, and the lowest by aggregate type. Enhancing the flexibility of cement mortar and enhancing the elastoplasticity of the matrix are conducive to improving the low-temperature performance of semi-flexible pavements.

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