Adsorption mechanism of polycarboxylate-based superplasticizer in CFBC ash-Portland cement paste

Song, Yali; Guo, Chuanchuan; Qian, Jueshi; Liu, Yiquan; Cao, Aizhi

doi:10.1007/s11595-014-1025-1

Cited by 17 publications

(3 citation statements)

References 11 publications

(13 reference statements)

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“…The free lime (f-CaO) content of FBCFA has been found to increase the water requirement [101]. Song et al [108] found that the polycarboxylate superplasticizer adsorption capacity of FBCFA-OPC paste is higher than that of PCCFA-OPC paste. Moreover, the adsorption amount of polycarboxylate superplasticizer increases with the ratio of ash to cement in the paste, and the fluidity of FBCFA-Portland cement paste is lower than that of the PCC fly ash paste.…”

Section: Partial Replacement Of Cement In Concretementioning

confidence: 99%

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

et al. 2020

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Traditionally fly ash is thought to be glassy, spherical particle originating from pulverized coal combustion (PCC) at temperature up to 1700 °C. However, nowadays fluidized bed combustion (FBC) technology is spreading quickly around the world as it is an efficient and environmentally friendly method. FBC is also able to utilize mixtures of low-grade solid fuels (e.g., coal, lignite, biomass, and waste) that have fluctuating quality, composition, and moisture contents. However, this leads to a high variation in the produced fly ash quality, unlike PCC fly ash, and hence challenges when attempting to utilize this fly ash. In this study, the utilization of fluidized bed combustion fly ash (FBCFA) was reviewed using the Scopus database. The most promising utilization target for FBCFA from biomass combustion is as a fertilizer and soil amendment. In construction, the FBCFA from various fuels is utilized as cement replacement material, in non-cement binders, as lightweight aggregates and cast-concrete products. Other types of construction applications include mine backfilling material, soil stabilizer, and road construction material. There are also other promising applications for FBCFA utilization, such as catalysts support material and utilization in waste stabilization.

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Section: Partial Replacement Of Cement In Concretementioning

confidence: 99%

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

et al. 2020

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“…The mechanisms of polycarboxylate water reducing agent [14][15][16][17][18][19] are mainly explained as follows:…”

Section: Schematic Representation Of the Typical Molecular Structure ...mentioning

confidence: 99%

Application of Polycarboxylate Superplasticizer in the Concrete

Huang¹,

Li²,

Zhang³

et al. 2017

MSF

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Compared with the traditional water reducer, polycarboxylicwater-reducing agent exhibits the advantages of high water-reducing rate, cement paste fluidity and low slump loss, etc. The structure of polycarboxylates water reducing agent molecular is comb type. Water reducing agent can be used in the molecular design because it has high water reducing rate, low dosage, good slump stability, and have great potential in increase strength. In recent years, it has attracted many researchers' attention. Water reducing agent can block or destroy cement granular flocculation structure, through the surface function, complexation, electrostatic repulsion force and stereo repulsive force. Research on water reducing agent based on the application of poly carboxylic acid can realize functional design of water reducing agent, so as to promote the development of high-performance concrete.

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“…Water‐soluble comb‐like polycarboxylates contain polyethylene or polypropylene oxide side chains which are attached to the backbone . They can adsorb onto solid particles by electrostatic attraction, hydrogen bonding or van der Waals interactions . Side chains are responsible for the steric hindrance effect .…”

Section: Introductionmentioning

confidence: 99%

Effects of the side chain density of polycarboxylate dispersants on dye dispersion properties

Gharanjig

Khosravi

2019

Coloration Technology

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Comb‐like polycarboxylates were synthesised by copolymerisation of methacrylic acid and nonylphenol polyethylene glycol methacrylate ester, and can be used as dye dispersants. In order to achieve good dispersive ability, three polycarboxylates were synthesised, each having a different side chain density. The side chain density of polymers was controlled by different ratios of monomers in the copolymerisation process. Acidic polymers were neutralised using sodium hydroxide. These polymers exhibit good dispersing performance, such that carboxylate groups are adsorbed onto the dye particle surface and the side chains enable the formation of a thick layer, thus providing the steric hindrance effect. Improvement of dye dissolution in the presence of polycarboxylates was studied. Polymers with a lower side chain density demonstrated a higher dye dissolution in water, which could be as a result of more effective adsorption of dispersant on the dye surface (CI Disperse Blue 79). The dyeing performance of the prepared dye dispersions on polyester was investigated. Spectrophotometric analysis of dyed fabrics using synthesised polycarboxylates demonstrates that there should be an optimum side chain density of polymer in order to control both dye solubility and dispersive ability. The result of turbidimetry and particle size analysis have proven this phenomenon. A comb‐like polycarboxylate with optimum side chain density was a better dye dispersant compared with a commercial sodium naphthalene sulphonate compound, as a result of its better heat stability.

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Adsorption mechanism of polycarboxylate-based superplasticizer in CFBC ash-Portland cement paste

Cited by 17 publications

References 11 publications

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

Application of Polycarboxylate Superplasticizer in the Concrete

Effects of the side chain density of polycarboxylate dispersants on dye dispersion properties

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