Effect of Zn 2+ on the early hydration behavior of potassium phosphate based magnesium phosphate cement

Lai, Zhenyu; Lai, Xinchun; Shi, Junbing; Lu, Zhongyuan

doi:10.1016/j.conbuildmat.2016.11.002

Cited by 52 publications

(15 citation statements)

References 30 publications

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“…At the same time, the cementation between the soil particles and the gel is reduced, resulting in an increase in the structural dispersion of the solidified soil, decreasing the sample structure strength, and increasing the dissolution probability of Zn 2+ . This is similar to the research results of Lai Z. Y and He Y. J, which show that heavy metal ions reduce the cementation between soil particles and gels, leading to an increase in the structural dispersion of the solidified soil and increasing the probability of the dissolution of heavy metal ions [44][45].…”

Section: Microstructure Analysis Of Mpc Solidified Zinc Contaminated supporting

confidence: 90%

Leaching characteristics and curing mechanism of magnesium phosphate cement solidified zinc-contaminated soil in an acid rain environment

Wang

Zhu

et al. 2020

Environmental Engineering Research

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A semi-dynamic leaching test was used to simulate the erosion effect of acid rain on magnesium phosphate cement (MPC)-stabilized/solidified zinc-contaminated soil. The leaching characteristics and curing mechanism were studied with a combination of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Influences of the initial pH value of the simulated acid rain, the ratio of the curing agent (MgO/KH2PO4, abbreviated M/P), and the mass of water glass on the leaching characteristics of Zn<sup>2+</sup> and conductivity in the leachate of the sample were studied. It is shown that the curing effect of the cement component on Zn<sup>2+</sup> is better for M/P = 6 when compared to M/P = 4 in a strong acid environment. While in a weak acid environment, it is observed that the curing effect is superior when M/P = 4. Also it is observed that 4% water glass content can effectively improve the cement curing effect of heavy metal Zn in an acid rain environment. These results indicate that water glass can be effectively applied to MPC solidified heavy metal Zn.

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Section: Microstructure Analysis Of Mpc Solidified Zinc Contaminated supporting

confidence: 90%

Leaching characteristics and curing mechanism of magnesium phosphate cement solidified zinc-contaminated soil in an acid rain environment

Wang

Zhu

et al. 2020

Environmental Engineering Research

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“…The advantages of MKP cements include fast setting [9,26,27], high early strength [9,[27][28][29], low shrinkage [9,29,30], and strong bonding with Portland cement concrete substrates [9,10,31,32]. MKP cements have been used as rehabilitation materials [9,31,32], as stabilization/solidification agents for immobilizing wastes containing heavy metals [33][34][35][36], and been considered as potential binders for conditioning low-level nuclear wastes [3,[37][38][39][40][41][42][43]. Recent research involved also the use in medical technology due to their good biocompatibility and antibacterial properties [44,45].…”

Section: Introductionmentioning

confidence: 99%

Influence of magnesium-to-phosphate ratio and water-to-cement ratio on hydration and properties of magnesium potassium phosphate cements

Winnefeld

Kaufmann

et al. 2019

Cement and Concrete Research

147

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Magnesium-to-phosphate (Mg/PO4) and water-to-cement (w/c) ratios are important 9 factors controlling hydration and properties of magnesium potassium phosphate (MKP) cements.This study investigated the influence of Mg/PO4 molar ratios (2.7, 4 and 8) and w/c (0.25 and 5) on cement hydration, compressive strength and volume stability. Low w/c ratio slowed down cement hydration at lower Mg/PO4 beyond 1 day, and prevented the precipitation of intermediate hydrates at higher Mg/PO4. At lower Mg/PO4 expansion and strength loss were observed with time due to the continuing hydration within the already hardened cement. Higher Mg/PO4 resulted in faster hydration, higher strength, and in the precipitation of traces of brucite, which had no significant influence on the long-term volume stability and strength. Therefore, moderate Mg/PO4 molar ratios between 4 and 8 depending on w/c ratio used are recommended for the production of MKP cements with robust performance.

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“…In this paper, zinc powder is used as a chemical foaming material, and the strength of different zinc powders is analyzed, such as M III-1 , M III-2 , and M III-3 in Table 1, and the strength decreased from 4.6 MPa to 2.3 MPa with increasing amount of Zn. is is due to the increase in the amount of zinc powder, the increase in porosity and the average pore size, and also due to the side effects of zinc on the hydration process [27].…”

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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Effect of Zn 2+ on the early hydration behavior of potassium phosphate based magnesium phosphate cement

Cited by 52 publications

References 30 publications

Leaching characteristics and curing mechanism of magnesium phosphate cement solidified zinc-contaminated soil in an acid rain environment

Leaching characteristics and curing mechanism of magnesium phosphate cement solidified zinc-contaminated soil in an acid rain environment

Influence of magnesium-to-phosphate ratio and water-to-cement ratio on hydration and properties of magnesium potassium phosphate cements

Preparation of Porous Materials by Magnesium Phosphate Cement with High Permeability

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