Mechanisms of dispersion of metakaolin particles via adsorption of sodium naphthalene sulfonate formaldehyde polymer

Derkani, Maryam H.; Koma, Gaone; Carter, Laura A.; Geddes, Daniel A.; Provis, John L.; Walkley, Brant

doi:10.1016/j.jcis.2022.07.166

Cited by 17 publications

(3 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This leads to the establishment of hydrogen bonds with H 2 O molecules in pure PC pastes. The creation of solvent hydrate shells induces lubrication and steric hindrance effects [ 73 , 74 ]. These roles represent the primary functions of PCEs.…”

Section: Applicationmentioning

confidence: 99%

Synthesis and Modification of Polycarboxylate Superplasticizers—A Review

Xia,

Shi,

Xiang

et al. 2024

Materials

View full text Add to dashboard Cite

The molecular-scale structural changes in polycarboxylic superplasticizer (PCE) can influence dispersion and water retention. Polycarboxylate superplasticizer, synthesized using different methods, may alter dispersion and water-reducing effects. The synthesis of PCE involves creating a novel macromolecular monomer with a controllable molecular mass, adjustable lipophilic, and hydrophilic moieties, as outlined in this study. This article reviews processes for synthesizing polycarboxylates and identifies the optimal method through orthogonal experiments to produce a modified polycarboxylate superplasticizer (PCE-P). The study investigated the effects of different PCE types and concentrations on the surface tension, fluidity, and ζ potential of cement paste. PCE-P, synthesized at room temperature, showed comparable performances in initial hydration and conversion rate in cement to PCE synthesized at high temperatures. PCE-P exhibited an increased slump but had a wider molecular weight distribution and longer main and side chains, leading to a 24.04% decrease in surface tension, indicating a good dispersibility.

show abstract

Section: Applicationmentioning

confidence: 99%

Synthesis and Modification of Polycarboxylate Superplasticizers—A Review

Xia,

Shi,

Xiang

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…This process leads to the disappearance of the accumulation phenomenon and an increase in interparticle pore size. The distinctive interlayer structure of metakaolin facilitates the adsorption of water and polycarboxylate molecules [27,28], resulting in a decrease in the free water content of metakaolin-mixed cement pastes along with a reduction in the quantity of polycarboxylate molecules required to disperse Portland cement particles. Consequently, the flowability of the pastes decreases significantly with an increase in metakaolin admixture content.…”

Section: Effects On the Flowability Of The Admixture Contentmentioning

confidence: 99%

Investigation of the Effects of Polyurethane-Modified Polycarboxylate at Ambient Temperature on the Characteristics of Cement with Supplementary Cementitious Materials

Xiang,

Zheng,

Zhang

et al. 2023

Polymers

View full text Add to dashboard Cite

Via radical polymerization, three polyurethane-modified polycarboxylate molecules of various comb topologies were synthesized. This study investigated the effects of varying types and concentrations of supplementary cementitious materials (SCMs) on the surface tension, flowability, and zeta potential of cement. An elevation in the molar ratio between isoamyl alcohol polyoxyethylene (TPEG) and acrylic acid (AA) from 1:1 to 5:1 reduced the surface tension of the polycarboxylate molecule from 47.70 mN/m to 35.53 mN/m and increased flowability from 280 mm to 310 mm, as the results indicated. An increase in the SCM and polycarboxylate dosage proportionally decreased liquid-phase surface tension and increased flowability. A decrease in the water-to-cement (w/c) ratio from 0.5 to 0.3 corresponded to an observed increase in the zeta potential of cement pastes. However, a rise in the quantity of polycarboxylate and SCMs corresponded to a decrease in the zeta potential at a w/c ratio of 0.3.

show abstract

“…Metakaolin as precursor material during alkali activation has so far not been widely studied for well cement applications, which could be due to the relatively large water consumption of the platelike metakaolin particles [24,25], thereby causing potential slurry viscosity and pumpability issues. However, it has recently been shown that metakaolinbased geopolymers can have good potential as well cement during steam injection operations, due to their improved mechanical properties [26], and consequently, there is a need for further studies on the mechanical properties and strength development of these materials.…”

Section: Introductionmentioning

confidence: 99%

Strength Development of Metakaolin-Based Alkali-Activated Cement

Lou,

Vrålstad

2023

Applied Sciences

View full text Add to dashboard Cite

Alkali-activated materials, sometimes called geopolymers, can be used as alternative cementitious materials to conventional Portland cement. Currently, there is a significant interest in these materials due to their low CO2 footprint. The typical applications of alkali-activated materials are within civil engineering; however, potential applications as well cementing material within the oil and gas industry are also receiving emerging interest. This paper presents a systematic study of the compressive strength development from 1 to 28 days for metakaolin-based alkali-activated cement. The results show that the compressive strength is highly dependent upon the initial Si/Al ratio in the mix design, as well as the concentration of the activator solution. Furthermore, due to the relatively low initial reactivity of the metakaolin material used, different types of co-binders were included in the slurry composition to improve early strength development. The two different co-binders tested were another, more reactive metakaolin material and Blast Furnace Slag (GGBFS). It was found that both these co-binders performed as intended, by ensuring early strength development via precipitation of K-A-S-H and C-A-S-H gels, respectively, and also by enabling subsequent strength development due to improved dissolution of the low-reactive metakaolin.

show abstract

Mechanisms of dispersion of metakaolin particles via adsorption of sodium naphthalene sulfonate formaldehyde polymer

Cited by 17 publications

References 77 publications

Synthesis and Modification of Polycarboxylate Superplasticizers—A Review

Synthesis and Modification of Polycarboxylate Superplasticizers—A Review

Investigation of the Effects of Polyurethane-Modified Polycarboxylate at Ambient Temperature on the Characteristics of Cement with Supplementary Cementitious Materials

Strength Development of Metakaolin-Based Alkali-Activated Cement

Contact Info

Product

Resources

About