Progresses in Synthesis of Polycarboxylate Superplasticizer

Xiang, Shuncheng; Gao, Yingli; Shi, Caijun

doi:10.1155/2020/8810443

Cited by 8 publications

(3 citation statements)

References 46 publications

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“…In this scenario, only steric hindrance can stand to explain the dispersion of the cement particles. A study that was performed on the zeta potential produced by polycarboxylate (PC) based SP and sulfonate-based plasticizers showed that the PC SP produced almost negligible zeta potential compared to the sulfonatebased SP [47]. Dispersion by steric hindrance observed in the PC SP is caused by the presence of neutral sidelong ether chains.…”

Section: Mechanism Of Action Of Superplasticizersmentioning

confidence: 99%

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Nthiga Njiru,

Wachira Muthengia,

Mulwa Munyao

et al. 2023

Advances in Civil Engineering

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Grinding aids (GAs) are polar chemicals introduced in cement mills in either liquid or powder form to improve on mill grindability efficiency. Studies have shown that some GAs not only help in grinding efficiency but also play vital roles in improving the product particle size distribution, product ability to flow in the mill, grinding energy reduction, and improvement on the separator efficiency. This review investigated the impacts of the GAs on the performance of some properties of cement when used as either mortar and/or concrete. The influence of the GAs incorporation in cement grinding on properties such as workability and setting times of the placed concrete and/or mortar has been covered in this review. The performance of GAs on ordinary portland cement (OPC) and blended cements with other supplementary cementitious materials such as pozzolana, fly ash, and slag has also been discussed. This is in view to tapping the maximum benefits of using GAs in cement production and use. This review work established that GAs have a positive influence on mill performance when properly applied. It further established that blended cements work better when dosed with additives such as GAs and/or quality improvers when compared to OPC. The review work demonstrated that some superplasticizers help in lowering the water demand in highly blended pozzolanic-based cements. The review finally recommended that the future course of action in the production of blended cements should apply GAs. This is in order to help produce highly replaced blended cements that are sustainable.

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Section: Mechanism Of Action Of Superplasticizersmentioning

confidence: 99%

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Nthiga Njiru,

Wachira Muthengia,

Mulwa Munyao

et al. 2023

Advances in Civil Engineering

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“…This additional energy helps meet the threshold required to catalyze the polymerization reaction, and the reactivity of the free radicals significantly promotes the polymerization of monomers . Due to climate change, polyacrylamide, polyacrylonitrile, and poly(carboxylic acid) have been widely used on the market for waterproof building materials and concrete additives in recent years. − This trend has spawned more research on azo initiators, driving new species of azos to be used in the field of polymer materials. However, azo initiators have caused thermal hazards in the production and storage processes, causing significant losses to personnel and property, highlighting the need for thermal hazard assessment of emerging azo initiators.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Thermal Hazard Characteristics of Three Low-Temperature Active Azo Initiators for Polymer Resin in Construction Industries under Adiabatic Conditions

Tsai

Wen

2022

ACS Omega

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Resins continue to occupy a place in the waterproof building market. Unlike traditional concrete building materials, the polymerization of resins requires initiators to support the required energy to drive the reaction or reduce the polymerization threshold, which shows a high reaction rate and low energy consumption in the polymerization process. Azo compounds (azos) are energetic substances commonly used in polymerization, but they can cause process hazards due to the amount of heat release and accumulation of the resulting heat. To ensure that similar hazards do not occur, the emerging azo initiators 2,2′-azobis(2-methylpropionamide)dihydrochloride (AIBA), 2-cyanopropan-2-yliminourea (CABN), and 2,2′-azodi(2-methylbutyronitrile) (AMBN) are explored. Depending on the process conditions, it is critical to examine how chemical reactions from a laboratory behave at a large scale. Kinetic models can be used to estimate fundamental safety parameters suitable for assessing the reaction hazards and as control measures, such as time to the maximum reaction rate under adiabatic conditions, time to the conversion limit, and runaway determination for process operation. The structure of this study is a combination of adiabatic calorimeter data and a nonlinear adiabatic dynamics model with the goal of helping to fill the void in research on thermal hazard analysis of emerging azo initiators. The adiabatic data is used to analyze the reaction mode characteristics of the azo compounds, and combined with the external environment, the reaction and temperature parameter changes of the azo compounds due to the reaction are discussed in the actual situation.

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“…Their mechanism of action on cement slurries is due to the predominant steric effect [22]. Much research has been devoted to the creation of superplasticizers and hyperplasticizers based on polycarboxylates [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Features of the Chemical Interaction of 2-Furaldehyde and 1,3,5-Trihydroxybenzene in an Alkaline Medium to Obtain a Plasticizing Additive

et al. 2021

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The paper presents data on the study of the polycondensation of 2-furaldehyde and 1,3,5-trihydroxybenzene in an alkaline medium to obtain a plasticizing additive. Results are presented on the study of the products of the separate interaction of 1,3,5-trioxybenzene and 2-furaldehyde with NaOH, and the joint polycondensation of 1,3,5-trioxybenzene with 2-furaldehyde with NaOH by UV spectroscopy. The structure of the product of the interaction of 1,3,5-trioxybenzene with 2-furaldehyde in an alkaline medium was studied by IR spectroscopy. Stronger C–H bonds appear in the IR spectrum and stretching vibrations of the C = O group are not observed, which confirms the production of a new compound. The optimal dosage of the developed plasticizing additive has been established as 0.3% of the cement mass (calculated on dry matter). The developed plasticizing additive can significantly reduce the water-cement ratio while maintaining the strength characteristics of cement compositions. In addition, when using the additive, the strength characteristics are significantly increased with a reduced water-cement ratio.

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Progresses in Synthesis of Polycarboxylate Superplasticizer

Cited by 8 publications

References 46 publications

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Review of the Effect of Grinding Aids and Admixtures on the Performance of Cements

Assessment of the Thermal Hazard Characteristics of Three Low-Temperature Active Azo Initiators for Polymer Resin in Construction Industries under Adiabatic Conditions

Features of the Chemical Interaction of 2-Furaldehyde and 1,3,5-Trihydroxybenzene in an Alkaline Medium to Obtain a Plasticizing Additive

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