Effect of recycled oyster shell powder on hydration and strength development of magnesium phosphate cement

IF 1.4 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Cement Research Pub Date : 2023-06-27 DOI:10.1680/jadcr.22.00103

Bingcong Chen, Junping Zhang, Airong Liu, Liwen Zhang, Zhujian Xie, Xiaowei Ouyang, Z. Ma

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引用次数: 0

Abstract

Using oyster shell powder (OSP) to prepare magnesium phosphate cement (MPC) not only reduces the pollution caused by the wasted oyster shell disposal, but also benefits the development of more environmentally friendly cement. The effect of OSP on the hydration and strength development of MPC was studied. An axial compression experiment including 45 cuboid specimens was executed to investigate the compressive strength, failure mode, stress–strain relationship, and energy absorption of MPC mixing with different mass contents (0% to 12%) of OSP over the curing times of 7, 14, and 28 days. Scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy were utilized for measuring the variation of MPC microstructure and hydration products caused by OSP. Results indicated that a new reactant CaHPO4·2H2O was formed, which optimized matrix strength. The substitution of OSP could reduce the cost of MPC by 2–9% without decreasing the strength. Compared with MPC without OSP, the compressive strength of the specimen with 3% OSP is increased by 6%. However, with the continuous increase of OSP, the compressive strength gradually decreases. Similarly, the elastic modulus of MPC increases first and then decreases with the increase of OSP.

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再生牡蛎壳粉对磷酸镁水泥水化及强度发展的影响

利用牡蛎壳粉（OSP）制备磷酸镁水泥（MPC），不仅减少了废弃牡蛎壳处理造成的污染，而且有利于开发更环保的水泥。研究了OSP对MPC水化和强度发展的影响。进行了一项包括45个长方体试样的轴向压缩实验，以研究不同OSP质量含量（0%-12%）的MPC在7、14和28天的固化时间内的抗压强度、破坏模式、应力-应变关系和能量吸收。利用扫描电子显微镜、X射线衍射和能谱仪测量了OSP引起的MPC微观结构和水化产物的变化。结果表明，生成了一种新的反应物CaHPO4·2H2O，优化了基体强度。OSP的替代可以在不降低强度的情况下将MPC的成本降低2–9%。与不含OSP的MPC相比，含3%OSP的试件抗压强度提高了6%。然而，随着OSP的不断增加，抗压强度逐渐降低。类似地，MPC的弹性模量随着OSP的增加先增大后减小。

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来源期刊

Advances in Cement Research 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

审稿时长

3.2 months

期刊介绍： Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.