Effectiveness of PCE superplasticizers in calcined clay blended cements

Li, Ran; Lei, Lei; Sui, Tongbo; Plank, Johann

doi:10.1016/j.cemconres.2020.106334

Cited by 75 publications

(33 citation statements)

References 30 publications

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“…Similar observations where made with a calcined kaolinitic clay. 30 There is however lack of data, which could prove adsorption of SO 4 2− or Ca-SO 4 ion pair complexes onto the surface of (calcined) clay particles.…”

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confidence: 99%

Hydration of cubic tricalcium aluminate in the presence of calcined clays

et al. 2021

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Calcium sulfates take an important role in the reaction of pozzolanic materials by forming ettringite with aluminum ions from the pozzolan. 1 Sulfate carriers like gypsum, bassanite, or anhydrite are used to retard the tricalcium aluminate (C 3 A) reaction in ordinary portland cement (OPC). 2 The latter mechanism is used to avoid flash set and to optimize strength development by preventing a superposition of the silicate and aluminate clinker reaction. 3 As calcined clay blended cements 4 or limestone calcined clay cements (LC 3 ) 5 are currently among the most promising solutions to address CO 2 emissions in cement industry 6 , their influence on cement hydration in general and on the aluminate reaction in particular is gaining attention. In calcined clay blended cements, where additional aluminum sources are present, awareness has been raised for extra sulfate demand, as the

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confidence: 99%

Hydration of cubic tricalcium aluminate in the presence of calcined clays

et al. 2021

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“…On 56 days and 90 days strength gain is observed till CSMB 20 specimens and on 180 days CSMB 25 also shows strength gain with respect to control specimen. The strength gain in the MB blended cement matrix based concrete system is due to the fine dispersion and due to the pozzolanic action rendered through the reactive silica present in the MB blended system [15,16].…”

Section: Compressive Strengthmentioning

confidence: 99%

Investigation on Strength, Shrinkage and Hydrogen Ion Concentration of Magnesium Binder Blended Cement Concrete

Devi¹,

Sudalaimani²

2021

JNMES

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This research work is to investigate the strength, shrinkage and hydrogen ion concentration of concrete admixed with magnesium binder. The magnesium binder is manufactured through calcination process at a temperature of 1200 degree Celsius. The raw materials for the magnesium binder are magnesite (magnesium carbonate) and steatite (magnesium silicate). The calcined powder is also mixed with phosphate salt for better performance. The magnesium binder is replaced to cement in the proportion of 0% to 30% and the samples were tested in laboratory conditions from 1 day to 360 days for its strength. The shrinkage is tested until 130 days and the pH value is tested on 28 days hardened concrete samples. The results show that the magnesium binder replacement has refined effect on pore structures which attributed to the better performance in strength and shrinkage.

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“…At present, a series of methods have been proposed to solve the issues concerning the application of clay sand and stone. − Many studies have focused on the anticorrosion property of clay-based hybrid materials for cements and mortars. − In particular, PCEs are necessary to alleviate the negative effects of clay. As a kind of comb-type high-molecular polymers, PCEs are mainly produced by aqueous free radical copolymerization of macromonomers with polyethylene glycol (PEG) side chains and unsaturated carboxylic acids. − The advantages of PCE, such as adjustable performance, low dosage, and high water reduction rate, make it the eco-friendly admixture for concretes.…”

Section: Introductionmentioning

confidence: 99%

Study on the Impact of Na/Ca Bentonites on the Dispersion Performance of Conventional and Modified Phosphate Polycarboxylate Superplasticizers in Cement Mortar

Feng

Mao²,

Feng³

et al. 2022

Langmuir

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Through molecular structure design, modified polycarboxylate superplasticizers (PCEs) were synthesized via copolymerization using isoprenyl oxy poly(ethylene glycol) ether (TPEG), acrylic acid, and hydroxyethyl methacrylate phosphate. TPEG-PCEs were selected as potential dispersants for Na/Cabentonite containing cement mortar. Other two kinds of commercial PCE that were obtained based on methallyl ether (HPEG) and ethylene-glycol monovinyl polyethylene glycol (EPEG) as macromonomers were also applied in the mortar. The effects of the type of bentonite and its dosage, as well as the monomer structure of PCEs and the type of cement, on the dispersion properties of the bentonite-containing mortar were studied. According to the findings, the initial fluidity of the mortar was reduced by about 20 mm when two kinds of bentonite were used. Applying 3% Ca-bentonite resulted in 40% flow loss in the mortar after 1 h. The fluidity of the mortar with Na-bentonite exhibited lower dispersion ability than that with Ca-bentonite when HPEG-PCE and EPEG-PCE were chosen as dispersants. The TPEG-PCE exhibited superior dispersing performance over HPEG-PCE and EPEG-PCE and exerted a retarding effect on cement, being also weakly sensitive to clay content. Thus, TPEG-PCEs with phosphate groups present a viable alternative to conventional PCEs.

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Effectiveness of PCE superplasticizers in calcined clay blended cements

Cited by 75 publications

References 30 publications

Hydration of cubic tricalcium aluminate in the presence of calcined clays

Hydration of cubic tricalcium aluminate in the presence of calcined clays

Investigation on Strength, Shrinkage and Hydrogen Ion Concentration of Magnesium Binder Blended Cement Concrete

Study on the Impact of Na/Ca Bentonites on the Dispersion Performance of Conventional and Modified Phosphate Polycarboxylate Superplasticizers in Cement Mortar

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