Effect of early hydration temperature on hydration product and strength development of magnesium phosphate cement (MPC)

You, Cuihong; Qian, Jueshi; Qin, Jihui; Wang, Hong-Tao; Wang, Qingzhen; Ye, Ziqi

doi:10.1016/j.cemconres.2015.07.005

Cited by 158 publications

(40 citation statements)

References 29 publications

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“…On the one hand, it can prolong the setting time, which is bene cial to the foaming e ect of Zn powder and forms more pores, on the other hand, silica can also reduce the hydration heat. e reduction of hydration heat avoids the release of ammonia gas during the reaction, while also avoiding the decomposition of hydration products which leads to the strength loss of the materials [28]. Figure 4 shows the water permeability of MPC fabricated by combining the physical foaming and chemically entrained gas methods.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Porous Materials by Magnesium Phosphate Cement with High Permeability

Lai

Yang

et al. 2018

Advances in Materials Science and Engineering

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High permeability and strength magnesium phosphate cement (MPC) with porosity, average pore size, and compressive strength varied from 63.2% to 74%, 138.7 μm to 284.7 μm and 2.3 MPa to 4.7 MPa, respectively, were successfully prepared by combining the physical foaming method and chemically entrained gas method at room temperature. The effects of borax content, chemical foaming agent content, zinc powder content and W/S ratio on the porosity, pore size distribution, compressive strength, and permeability of the MPC were investigated. The results indicate that the chemical foaming agent content tends to have little impact on the porosity and compressive strength, and the zinc powder content has the most significant influence on the average pore size of MPC. The air pores distribution and connectivity of MPC were mainly controlled by the borax content, W/S ratio, and chemical foaming agent content. Zinc powder played a destructive role in the pores formed by the early physical foaming and led to an increase in pore size and a large number of through pores, which increased the permeability of the materials.

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Section: Resultsmentioning

confidence: 99%

Preparation of Porous Materials by Magnesium Phosphate Cement with High Permeability

Lai

Yang

et al. 2018

Advances in Materials Science and Engineering

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“…In addition to the mix proportion, the early strength and reaction products of MPC depend on the ambient temperature and increases in the reaction temperature [32]. An appropriate reaction temperature increase is conducive to improving the early strength of the MPC in severe cold environments.…”

Section: Strength Improvement Of Mpc In Severe Cold Environmentmentioning

confidence: 99%

Preparation and Application of Self-Curing Magnesium Phosphate Cement Concrete with High Early Strength in Severe Cold Environments

et al. 2020

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The early strength of magnesium phosphate cement (MPC) decreases sharply in severe cold environments ≤−10 °C, with the 2 h compressive strength falling to 3.5 MPa at−20 °C. Therefore, it cannot be used as a repair material for emergency repair construction in such environments. In this study, MPC is adapted for use in such cold environments by replacing part of the dead-burned magnesia (M) in the mixture with a small amount of light-burned magnesia (LBM) and introducing dilute phosphoric acid (PA) solution as the mixing water. The heat released by the highly active acid–base reaction of PA and LBM stimulates an MPC reaction. Moreover, the early strength of the MPC significantly improves with the increase in the Mg2+ concentration and the initial reaction temperature of the MPC paste, which enables MPC hardening in severe cold environments. Although the morphology of the reaction products of the MPC is poor and the grain plumpness and size of the struvite crystals are remarkably reduced, the early strength of MPC prepared in the severe cold environment is close to that of MPC prepared under normal temperature. Furthermore, the increases in the early reaction temperature and early strength of magnesium phosphate cement concrete (MPCC) are significantly improved when the PA concentration in the mixing water and the LBM/M ratio are 10% and 4–6% at −10 °C and 20% and 6–8% at −20 °C, respectively. Moreover, self-curing of MPCC can be realized even at −20 °C, at which temperature the 2 h and 24 h compressive strength of MPCC reach 36 MPa and 45 MPa, respectively.

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“…Borax as a retarder is a commonly used material to prolong the setting time. Many studies have shown that the retardation effect was not ideal when borax was added with a low content; when borax was excessive, the compressive strength of MKPC would be negatively affected . Therefore, it is a challenging task to keep the balance between setting time and mechanical properties in MKPC.…”

Section: Introductionmentioning

confidence: 99%

Influence of FeCl₃⋅6H₂O on the Hydration Hardening and Water Resistance of Magnesium Potassium Phosphate Cement

Zhu

Zhen

et al. 2020

ChemistrySelect

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Magnesium potassium phosphate cement (MKPC) is an ideal repair material due to its rapid curing advantages, but the setting time is too short to be applied in practical applications. In this work, FeCl3⋅6H2O was incorporated to MKPC to reduce the hydration temperature and prolong the setting time. Comprehensive investigation was performed on the influence of FeCl3⋅6H2O on the hydration temperature, setting time, mechanical properties, water resistance and microstructure of MKPC. The results showed that during the hydration process, FeCl3⋅6H2O underwent a phase transition and absorbed part of the hydration heat, which delayed the hydration heat release rate and effectively extended the setting time. In addition, the incorporation of FeCl3⋅6H2O with suitable contents had a positive impact on the compressive strength and water resistance. Finally, the optimal content of FeCl3⋅6H2O was determined to be 1.0%.

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Effect of early hydration temperature on hydration product and strength development of magnesium phosphate cement (MPC)

Cited by 158 publications

References 29 publications

Preparation of Porous Materials by Magnesium Phosphate Cement with High Permeability

Preparation of Porous Materials by Magnesium Phosphate Cement with High Permeability

Preparation and Application of Self-Curing Magnesium Phosphate Cement Concrete with High Early Strength in Severe Cold Environments

Influence of FeCl₃⋅6H₂O on the Hydration Hardening and Water Resistance of Magnesium Potassium Phosphate Cement

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Effect of early hydration temperature on hydration product and strength development of magnesium phosphate cement (MPC)

Cited by 158 publications

References 29 publications

Preparation of Porous Materials by Magnesium Phosphate Cement with High Permeability

Preparation of Porous Materials by Magnesium Phosphate Cement with High Permeability

Preparation and Application of Self-Curing Magnesium Phosphate Cement Concrete with High Early Strength in Severe Cold Environments

Influence of FeCl3⋅6H2O on the Hydration Hardening and Water Resistance of Magnesium Potassium Phosphate Cement

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Influence of FeCl₃⋅6H₂O on the Hydration Hardening and Water Resistance of Magnesium Potassium Phosphate Cement