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Title: Hydration behavior of magnesium potassium phosphate cement and stability analysis of its hydration products through thermodynamic modeling

Abstract

Magnesium potassium phosphate cement (MKPC) is normally applied in civil engineering because of its short setting time and superior mechanical properties. This study investigates the hydration behavior and hydration products of MKPC influenced by molar ratio between magnesia and phosphate (M/P ratio) through thermodynamic method. Results show that the composition of ultimate hydration products are controlled by concentration of KH{sub 2}PO{sub 4} and MgO, activity of water and pH value of solution. When M/P ratio is lower than 0.64, the hydration product is MgHPO{sub 4}·3H{sub 2}O; When M/P ratio is between 0.64 and 0.67, the hydration products are MgHPO{sub 4}·3H{sub 2}O and Mg{sub 2}KH(PO{sub 4}){sub 2}·15H{sub 2}O. When M/P ratio is between 0.67 and 1.00, hydration products are Mg{sub 2}KH(PO{sub 4}){sub 2}·15H{sub 2}O and KMgPO{sub 4}·6H{sub 2}O; When M/P ratio is higher than 1.00, the hydration product is KMgPO{sub 4}·6H{sub 2}O together with unreacted MgO. This study also investigated the effect of additives, namely B(OH){sub 3}, H{sub 3}PO{sub 4}, K{sub 2}HPO{sub 4} and KH{sub 2}PO{sub 4}. - Highlights: • A database particularly for MKPC system at 25°C, 0.1 MPa was established and verified. • The pH value corresponding to specific M/P ratio in MKPC system is successfully predicted at 25°C,more » 0.1 MPa. • The composition of hydration products influenced by M/P ratio and some additives is successfully predicted at 25°C, 0.1 MPa.« less

Authors:
 [1];  [1];  [2];  [1]
  1. Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189 (China)
  2. College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan (China)
Publication Date:
OSTI Identifier:
22697120
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 98; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; BORIC ACID; CEMENTS; CIVIL ENGINEERING; HYDRATION; MAGNESIUM OXIDES; MAXIMUM PERMISSIBLE ACTIVITY; MECHANICAL PROPERTIES; PH VALUE; PHOSPHORIC ACID; POTASSIUM PHOSPHATES; PRESSURE RANGE MEGA PA; THERMODYNAMICS; WATER

Citation Formats

Zhang, Tao, Chen, Huisu, Li, Xiangyu, and Zhu, Zhigang. Hydration behavior of magnesium potassium phosphate cement and stability analysis of its hydration products through thermodynamic modeling. United States: N. p., 2017. Web. doi:10.1016/J.CEMCONRES.2017.03.015.
Zhang, Tao, Chen, Huisu, Li, Xiangyu, & Zhu, Zhigang. Hydration behavior of magnesium potassium phosphate cement and stability analysis of its hydration products through thermodynamic modeling. United States. https://doi.org/10.1016/J.CEMCONRES.2017.03.015
Zhang, Tao, Chen, Huisu, Li, Xiangyu, and Zhu, Zhigang. 2017. "Hydration behavior of magnesium potassium phosphate cement and stability analysis of its hydration products through thermodynamic modeling". United States. https://doi.org/10.1016/J.CEMCONRES.2017.03.015.
@article{osti_22697120,
title = {Hydration behavior of magnesium potassium phosphate cement and stability analysis of its hydration products through thermodynamic modeling},
author = {Zhang, Tao and Chen, Huisu and Li, Xiangyu and Zhu, Zhigang},
abstractNote = {Magnesium potassium phosphate cement (MKPC) is normally applied in civil engineering because of its short setting time and superior mechanical properties. This study investigates the hydration behavior and hydration products of MKPC influenced by molar ratio between magnesia and phosphate (M/P ratio) through thermodynamic method. Results show that the composition of ultimate hydration products are controlled by concentration of KH{sub 2}PO{sub 4} and MgO, activity of water and pH value of solution. When M/P ratio is lower than 0.64, the hydration product is MgHPO{sub 4}·3H{sub 2}O; When M/P ratio is between 0.64 and 0.67, the hydration products are MgHPO{sub 4}·3H{sub 2}O and Mg{sub 2}KH(PO{sub 4}){sub 2}·15H{sub 2}O. When M/P ratio is between 0.67 and 1.00, hydration products are Mg{sub 2}KH(PO{sub 4}){sub 2}·15H{sub 2}O and KMgPO{sub 4}·6H{sub 2}O; When M/P ratio is higher than 1.00, the hydration product is KMgPO{sub 4}·6H{sub 2}O together with unreacted MgO. This study also investigated the effect of additives, namely B(OH){sub 3}, H{sub 3}PO{sub 4}, K{sub 2}HPO{sub 4} and KH{sub 2}PO{sub 4}. - Highlights: • A database particularly for MKPC system at 25°C, 0.1 MPa was established and verified. • The pH value corresponding to specific M/P ratio in MKPC system is successfully predicted at 25°C, 0.1 MPa. • The composition of hydration products influenced by M/P ratio and some additives is successfully predicted at 25°C, 0.1 MPa.},
doi = {10.1016/J.CEMCONRES.2017.03.015},
url = {https://www.osti.gov/biblio/22697120}, journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 98,
place = {United States},
year = {Tue Aug 15 00:00:00 EDT 2017},
month = {Tue Aug 15 00:00:00 EDT 2017}
}