scholarly journals A New Magnesium Phosphate Cement Based on Renewable Oyster Shell Powder: Flexural Properties at Different Curing Times

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5433
Author(s):  
Hui Wu ◽  
Zhujian Xie ◽  
Liwen Zhang ◽  
Zhiwei Lin ◽  
Shimin Wang ◽  
...  
Keyword(s):  
Potassium Phosphate ◽  
Oyster Shell ◽  
Hydration Product ◽  
Bending Test ◽  
Magnesium Phosphate ◽  
Flexural Properties ◽  
Mass Content ◽  
Oyster Shell Powder ◽  
High Production Cost ◽  
Shell Powder

Magnesium phosphate cement (MPC), a new type of inorganic cementitious material, is favored in engineering and construction because of its fast setting speed and high bonding strength, but is limited in practical application due to its high production cost and excessive release of hydration heat. Relevant research has investigated the application of discarded oyster shell powder (OSP) replacing cement mortar and has reported certain improvements to its performance. Consequently, focusing on discovering more effects of OSP on MPC performance, this study, by using a typical three-point bending test, used 45 cuboid specimens to investigate the influences of OSP mass content on flexural properties of MPC at different curing times. Results illustrated that MPC flexural strength was first increased and then decreased, and 3% is the critical value for OSP mass content. Similarly, the stiffness of all specimens presented a tendency to increase first and then decrease, with a maximum value of 36.18 kN/mm appearing at 3%, i.e., the critical OSP mass content. Finally, scanning electron microscope (SEM) and X-ray diffraction (XRD) were employed to analyze the microstructure and composition of specimens, confirming that the specimens generated not only the hydration product potassium phosphate magnesium (MgKPO4·6H2O, MKP), but also another new reactant (CaHPO4·2H2O).

The effect of oyster shell powder on the extension of the shelf life of tofu

2007 ◽  
Vol 103 (1) ◽  
pp. 155-160 ◽  
Author(s):  
Young Soon Kim ◽  
Yang Mun Choi ◽  
Dong Ouk Noh ◽  
Seung Yong Cho ◽  
Hyung Joo Suh
Keyword(s):  
Shelf Life ◽  
Oyster Shell ◽  
Oyster Shell Powder ◽  
Shell Powder

Rendering polypropylene biocomposites antibacterial through modification with oyster shell powder

Polymer ◽  
2019 ◽  
Vol 160 ◽  
pp. 265-271 ◽  
Author(s):  
Chi-Hui Tsou ◽  
Chin-San Wu ◽  
Wei-Song Hung ◽  
Manuel Reyes De Guzman ◽  
Chen Gao ◽  
...  
Keyword(s):  
Oyster Shell ◽  
Oyster Shell Powder ◽  
Shell Powder

scholarly journals Calcined Oyster Shell Powder as an Expansive Additive in Cement Mortar

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1322 ◽  
Author(s):  
Joon Ho Seo ◽  
Sol Moi Park ◽  
Beom Joo Yang ◽  
Jeong Gook Jang
Keyword(s):  
Compressive Strength ◽  
Cement Mortar ◽  
Autogenous Shrinkage ◽  
Oyster Shell ◽  
Heat Of Hydration ◽  
Strength Development ◽  
Flow Loss ◽  
Hardened Properties ◽  
Oyster Shell Powder ◽  
Shell Powder

The present study prepared calcined oyster shell powder having chemical composition and crystal structure of calcium oxide and lime, respectively, and investigated the fresh and hardened properties of cement mortar incorporating calcined oyster shell powder as an additive. The test results indicated that the hydration of calcined oyster shell powder promoted the additional formation of Ca(OH)2 at the initial reaction stage, thereby increasing the heat of hydration. In particular, the volumetric increase of calcined oyster shell powder during hydration compensated the autogenous shrinkage of mortar at early ages, ultimately leading to a clear difference in the shrinkage values at final readings. However, an excessive incorporation of calcined oyster shell powder affected the rate of C–S–H formation in the acceleratory period of hydration, resulting in a decrease in the compressive strength development. Meanwhile, the degree of flow loss was inconsequential and rapid flow loss was not observed in the specimens with calcined oyster shell powder. Therefore, considering the fresh and hardened properties of cement mortar, the incorporation of calcined oyster shell powder of approximately 3% by weight of cement is recommended to enhance the properties of cement mortar in terms of compressive strength and autogenous shrinkage.

Fire-retardant plastic material from oyster-shell powder and recycled polyethylene

2005 ◽  
Vol 99 (4) ◽  
pp. 1583-1589 ◽  
Author(s):  
Mi Hwa Chong ◽  
Byoung Chul Chun ◽  
Yong-Chan Chung ◽  
Bong Gyoo Cho
Keyword(s):  
Plastic Material ◽  
Fire Retardant ◽  
Oyster Shell ◽  
Recycled Polyethylene ◽  
Oyster Shell Powder ◽  
Shell Powder

3D printed porous polycaprolactone/oyster shell powder (PCL/OSP) scaffolds for bone tissue engineering

2018 ◽  
Vol 5 (4) ◽  
pp. 045403 ◽  
Author(s):  
Wenfeng Luo ◽  
Shuangying Zhang ◽  
Yuewei Lan ◽  
Chen Huang ◽  
Chao Wang ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Oyster Shell ◽  
3D Printed ◽  
Oyster Shell Powder ◽  
Shell Powder

scholarly journals Superhydrophobic foam prepared from high internal phase emulsion templates stabilised by oyster shell powder for oil–water separation

RSC Advances ◽  
2019 ◽  
Vol 9 (31) ◽  
pp. 17543-17550 ◽  
Author(s):  
Chuan-ming Yu ◽  
Xiao-hui Zhuang ◽  
Sheng-wei Zeng ◽  
Qi-xing Dong ◽  
Zhan-xin Jing ◽  
...  
Keyword(s):  
Oyster Shell ◽  
Water Separation ◽  
High Internal Phase Emulsion ◽  
Internal Phase ◽  
Styrene Divinylbenzene ◽  
Oil Water Separation ◽  
Oil Water ◽  
Oyster Shell Powder ◽  
Span 80 ◽  
Shell Powder

Poly(styrene-divinylbenzene) foam was synthesized through a high internal phase emulsion (HIPE) technique with Span 80 and superfine oyster shell powder as a co-emulsifier, and the foam exhibited excellent superhydrophobicity and oleophilicity.

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