Investigation of sodium alginate as a candidate retarder of magnesium phosphate cement: Hydration properties and its retarding mechanism

Fang, Bodong; Zhang, Guanhua; Guo, Jinbo; Yang, Yuanquan

doi:10.1016/j.ceramint.2022.07.038

Cited by 20 publications

(8 citation statements)

References 29 publications

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“…Sodium alginate is a byproduct after the extraction of iodine and mannitol from kelp or sargassum whose molecules are composed of β- d -mannuronic acid (M) and α- l -guluronic acid (G). − When there are divalent cations such as Ca 2+ and Sr 2+ , the sodium ion on the G unit undergoes an ion exchange reaction with divalent cations, so that the G units are stacked to form cross-linked network hydrogels. − Since those processes occur at room temperature without the requirements of heating and complicated instruments, it would be possible to develop a simple and integrated experimental kit to prepare the hydrogels. The kit contains all the necessary things and can be used to conduct experiments easily at many occasions as needed, which will be discussed in sections below.…”

Section: Resultsmentioning

confidence: 99%

A Color-Changeable “Pearl” for Visually Displaying Chemical Complexation Reactions

et al. 2022

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An experimental design by combining hydrogel and ethylenediaminetetraacetic acid disodium salt (EDTA) for visually displaying chemical complexation reactions is developed. The Na + ions on the α-L-guluronic acid (G) unit of the sodium alginate molecule undergo an ion exchange with a divalent cation, so that the G units are stacked to create a cross-linked network, forming a hydrogel. EDTA is inserted into the as-prepared hydrogel, producing transparent hydrogel microspheres containing EDTA, which are considered to be colorchangeable pearls on the basis of the chelation of EDTA when reacting with several metal ions. By using different stability constants of the same typed coordination complexes, the color of pearls is changeable. The process and mechanism of the complex reaction are investigated by using elemental mapping, Fourier transform infrared reflection (FTIR) and Raman spectra. Moreover, all the instruments and chemicals for this experiment are included in one single portable experimental kit. The kit is small, easy to carry, cheap, and safe, and it enables easy display of related chemical reactions. By using the developed kit, the students' hands-on experience can be improved. The experimental operation is simple, green, safe, and interesting, which enables the engineering of color-changeable pearls to be broadly used including the chemical experiment courses in universities, experimental teaching in schools, and the chemical popularization activities for the public.

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Section: Resultsmentioning

confidence: 99%

A Color-Changeable “Pearl” for Visually Displaying Chemical Complexation Reactions

et al. 2022

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“…The main reason is that the retarder Poly-AAMD contains a large number of hydrophilic groups, the content of free water in cement slurry is decreased attribute to the adsorption effect of hydrophilic groups. 25…”

Section: Effect Of Poly-aamd On the Settlement Stabilitymentioning

confidence: 99%

Preparation, characterization, and retarding mechanism of high temperature resistant amphoteric ion polymer oil well cement retarderPoly‐AAMDforHTHPapplication

Jinhua,

Xing,

Junwei

et al. 2023

J of Applied Polymer Sci

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The amphoteric ion polymer cement retarder Poly‐AAMD was synthesized by aqueous solution polymerization, the chemical structure, molecular weight, and thermal stability was studied. As a result, the Mn and Mw are 1.3 × 104 and 4.7 × 104 g/mol, respectively, and the initial decomposition temperature is 260°C. Then, the effects of retarder Poly‐AAMD on the application performance of cement slurry, such as settlement stability, thickening time, compressive strength, and rheological properties, were investigated. Especially, the thickening time of cement slurry with 1.2 and 1.5 wt% retarder Poly‐AAMD is 312 and 316 min at 220°C, the compressive strength is larger than 14 MPa at 24 h. Compared to conventional retarders, the temperature resistance has been improved to 220°C. Simultaneously, the initial hydration process of cement slurry was studied by low field NMR based on the T2 value. Moreover, the hydration products of cement slurry with retarder Poly‐AAMD were analyzed depends on the qualitative and quantitative analysis methods, the type and content of hydration products were confirmed by the methods of X‐ray diffraction analysis (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TG), and differential thermal analysis (DTG). Finally, the retarding mechanism of retarder Poly‐AAMD was further studied depends on the results of adsorption amount and Zeta potential.

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“…Particular attention has been dedicated to the key role played by water in the hydration reactions occurring in OPC, and the different types of compounds generated during this step. In this context, the recent literature [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] clearly highlights the pivotal interest still present in the development of new advanced cement and cementitious materials. Even if cement is a well-consolidated material, the chemistry of cement (and the chemistry inside cement) remains very complex and not obvious.…”

Section: Introductionmentioning

confidence: 99%

An Insight into the Chemistry of Cement—A Review

Lavagna

Nisticò

2022

Applied Sciences

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Even if cement is a well-consolidated material, the chemistry of cement (and the chemistry inside cement) remains very complex and still non-obvious. What is sure is that the hydration mechanism plays a pivotal role in the development of cements with specific final chemical compositions, mechanical properties, and porosities. This document provides a survey of the chemistry behind such inorganic material. The text has been organized into five parts describing: (i) the manufacture process of Portland cement, (ii) the chemical composition and hydration reactions involving a Portland cement, (iii) the mechanisms of setting, (iv) the classification of the different types of porosities available in a cement, with particular attention given to the role of water in driving the formation of pores, and (v) the recent findings on the use of recycled waste materials in cementitious matrices, with a particular focus on the sustainable development of cementitious formulations. From this study, the influence of water on the main relevant chemical transformations occurring in cement clearly emerged, with the formation of specific intermediates/products that might affect the final chemical composition of cements. Within the text, a clear distinction between setting and hardening has been provided. The physical/structural role of water in influencing the porosities in cements has been analyzed, making a correlation between types of bound water and porosities. Lastly, some considerations on the recent trends in the sustainable reuse of waste materials to form “green” cementitious composites has been discussed and future considerations proposed.

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Investigation of sodium alginate as a candidate retarder of magnesium phosphate cement: Hydration properties and its retarding mechanism

Cited by 20 publications

References 29 publications

A Color-Changeable “Pearl” for Visually Displaying Chemical Complexation Reactions

A Color-Changeable “Pearl” for Visually Displaying Chemical Complexation Reactions

Preparation, characterization, and retarding mechanism of high temperature resistant amphoteric ion polymer oil well cement retarderPoly‐AAMDforHTHPapplication

An Insight into the Chemistry of Cement—A Review

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