Comparative Investigation of Effect of Borax and Sodium Gluconate Retarders on Properties of Magnesium Phosphate Cement

Luo, Zhenmin; Wang, Yu; Liu, Xiaohai; Tian, Chongfei; Wang, Shaobin; Mu, Yuandong; Zhang, Meixiang; Hao, Yuhua

doi:10.1007/s13369-022-06762-0

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…These reactions involve a high exothermic process, and the incorporation of inorganic additions (e.g., FA, metakaolin or pumice) can contribute to decreasing the total heat and improve the chemical and mechanical properties in a more controlled thermal environment [ 14 ]. Due to the rapid acidic–basic reaction, a chemical retarder (e.g., orthoboric acid (H 3 BO 3 )) is usually introduced to delay the kinetics of the reaction and control the setting time [ 15 ]. MKPC binders with a 1M magnesia-to-phosphate ratio (M/P ratio) have potential advantageous properties with respect to Portland cementitious matrices, such as their lower pH, rapid strength development, resistance to high-temperature environments, low permeability, and excellent corrosion resistance for Al immobilization [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

MgO/KH2PO4 and Curing Moisture Content in MKPC Matrices to Optimize the Immobilization of Pure Al and Al-Mg Alloys

Fernández-García,

Alonso,

Bastidas

et al. 2024

Materials

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Magnesium Potassium Phosphate Cements (MKPCs) are considered a good alternative for the immobilization of aluminium radioactive waste. MKPC composition and moisture curing conditions are relevant issues to be evaluated. The corrosion of pure aluminium (A1050) and AlMg alloys (AA5754) with 3.5% of Mg is studied in MKPC systems prepared with different MgO/KH2PO4 (M/P) molar ratios (1, 2, and 3M) and moisture curing conditions (100% Relative Humidity (RH) and isolated in plastic containers (endogenous curing)). The Al corrosion potential (Ecorr) and corrosion kinetic (icorr and Vcorr) are evaluated over 90 days. Additionally, the pore ion evolution, the matrix electrical resistance, the pore structure, and compressive strength are analysed. The corrosion process of Al alloy is affected by the pH and ion content in the pore solution. The pore pH increases from near neutral for the 1M M/P ratio to 9 and 10 for the 2 and 3M M/P ratio, increasing in the same way the corrosion of pure Al (AA1050) and AlMg alloys (AA5754). The effect of Mg content in the alloy (AA5754) becomes more relevant with the increase in the M/P ratio. The presence of phosphate ions in the pore solution inhibits the corrosion process in both Al alloys. The MKPC physicochemical stability improved with the increase in the M/P ratio, higher mechanical strength, and more refined pore structure.

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Section: Introductionmentioning

confidence: 99%

MgO/KH2PO4 and Curing Moisture Content in MKPC Matrices to Optimize the Immobilization of Pure Al and Al-Mg Alloys

Fernández-García,

Alonso,

Bastidas

et al. 2024

Materials

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“…Among them, GA is preferable due to the advantages of its high yield, high availability, and extensive utilization in the chemical, food, and pharmaceutical industries [14]. Luo et al reported that sodium gluconate as a concrete or cement retarder can increase setting times and fluidity, and also enhances mechanical performance and durability by improving pore structure and heterogeneity [15]. In addition, the high purity of GA or its derivatives (such as sodium/calcium gluconate) is nonessential as a cement or concrete additive [16,17].…”

Section: Introductionmentioning

confidence: 99%

Sequential Bioprocess with Gluconobacter oxydans and Candida tropicalis for Gluconic Acid and Single-Cell Protein Production from Enzymatic Hydrolysate

et al. 2023

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To meet the growing global demand for gluconic acid as a cement and concrete retarder, inexpensive and abundant lignocellulosic materials are regarded as the most suitable alternatives to starchy materials. However, their enzymatic hydrolysate contains not only glucose but also xylose, which negatively affects the performance of gluconic acid as a retarder. Notably, glucose is preferentially bio-oxidized into gluconic acid by Gluconobacter oxydans, but gluconic acid cannot be metabolized by Candida tropicalis. Given this, an artificially designed biological cascade process, respectively employing Gluconobacter oxydans and Candida tropicalis, was established to successfully carry out glucose conversion into gluconic acid, and xylose into a single-cell protein, using the enzymatic hydrolysate of corncobs as a feedstock. This sequential fermentation process produced 95.8 g/L gluconic acid and 9.0 g/L single-cell protein from one liter of the enzymatic hydrolysate that initially contained 98.1 g/L of glucose and 25.4 g/L of xylose. The mass-balance calculation showed that approximately 280 grams of gluconic acid and 27 grams of the single-cell protein could be harvested from 1000 grams of the corncob feedstock. The results suggest that the above-mentioned two-step bioconversion method is efficient in utilizing glucose and xylose from lignocellulosic hydrolysates.

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Research progress on the setting time and solidification mechanism of magnesium phosphate cement: A review

Meng,

Jiang,

Chen

et al. 2023

Construction and Building Materials

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Comparative Investigation of Effect of Borax and Sodium Gluconate Retarders on Properties of Magnesium Phosphate Cement

Cited by 8 publications

References 25 publications

MgO/KH2PO4 and Curing Moisture Content in MKPC Matrices to Optimize the Immobilization of Pure Al and Al-Mg Alloys

MgO/KH2PO4 and Curing Moisture Content in MKPC Matrices to Optimize the Immobilization of Pure Al and Al-Mg Alloys

Sequential Bioprocess with Gluconobacter oxydans and Candida tropicalis for Gluconic Acid and Single-Cell Protein Production from Enzymatic Hydrolysate

Research progress on the setting time and solidification mechanism of magnesium phosphate cement: A review

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