Low Carbon Alkali-Activated Slag Binder and Its Interaction with Polycarboxylate Superplasticizer: Importance of Microstructural Design of the PCEs

Li, Ran; Eisenreich, Wolfgang; Lei, Lei; Plank, Johann

doi:10.1021/acssuschemeng.2c05430

Cited by 5 publications

(3 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The actual molar ratio of EPEG to AA can be quantitatively calculated by determining the total area of the H characteristic peak signals in both the PCE main chain and PEG side chain. , Importantly, it is found that the actual molar ratio of EPEG to AA under photoinitiation is close to the feeding molar ratio in Table S4. The actual monomer ratio of the LPCE1 structure is 1:4.13, which closely approximates the theoretically designed ratio of 1:4.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Zhou,

Li,

Duan

et al. 2024

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Polycarboxylate superplasticizers (PCEs) prepared by traditional free radical initiation methods need to use chemicals as initiators, which are environmentally unfriendly. In contrast, photoinitiation offers an ecofriendly and sustainable alternative. In our work, PCEs are successfully synthesized by photoinitiated radical polymerization without photoinitiators using ethylene glycol monovinyl polyethylene glycol (EPEG) and acrylic acid (AA) as monomers. The structure and properties of PCEs synthesized by photoinitiation and conventional redox initiation are studied, and the influence mechanism is discussed. The molecular weight distribution of photopolymerized PCE (LPCE) is narrower, and the constructed molecular structure is closer to the theoretical design. Therefore, the adsorption capacity and adsorption layer thickness of LPCE are increased on cement, which significantly improves the dispersion performance of cement paste, reduces the viscosity of paste, and enhances the compressive strength of concrete. Moreover, the reactivity ratios of EPEG and acrylic acid (AA) under photoinitiation are r EPEG = 0.0299 and r AA = 2.6215, and those of redox initiation are r EPEG ′ = 0.0126 and r AA ′ = 5.0096 via the Yezrielev−Brokhina−Roskin (YBR) method, proving that photoinitiation increases the reactivity ratio of EPEG and weakens the self-polymerization tendency of AA. This study provides a simple photoinitiated method for the synthesis of PCEs, which could potentially offer greater environmental friendliness.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Zhou,

Li,

Duan

et al. 2024

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…It has been reported commonly that PCE products that are unadsorbed on cement could substantially improve dispersion and flowability of cement due to their steric hinderance effect 82 . However, self‐polymerization of small monomers and presence of side products remain a major challenge in the PCE production process 83 …”

Section: Synthetic Concrete Water Reducersmentioning

confidence: 99%

Production of bio‐based concrete water reducers from renewable resources: a review

Johnson

Sosa

Arredondo

et al. 2023

Biofuels Bioprod Bioref

View full text Add to dashboard Cite

Concrete is a valuable construction material with high mechanical strength and durability, used extensively in the construction industry. It is produced by mixing sand, stones, cement, and water in different proportions depending on the desired quality of the final product. Water reducers are additional chemical ingredients used in concrete to reduce the quantity of water required in the concrete mixture. When added to concrete, water reducers increase the workability and flowability of concrete in the freshly mixed state and improve the mechanical strength and durability of the final hardened product. This review paper describes the different types and applications of concrete water reducers used in the construction industry including their working mechanisms and fluidity effects on concrete properties. It discusses the production of synthetic and bio‐based concrete water reducers and reviews the present challenges involved in the preparation of bio‐based concrete water reducers from renewable resources. © 2023 Society of Industrial Chemistry and John Wiley & Sons Ltd.

show abstract

“…In practical engineering application, it was found that although the water reduction rate of ester-containing PCEs was not prominent, it had wide adaptability with different cements, and the concrete mixed with it had excellent workability [19]. Although the water-reducing rate of ether-containing PCEs was higher, it often caused segregation and bleeding of concrete due to its sensitive dosage, which seriously affected the workability of concrete [20]. Therefore, PCEs with different molecular structures might play different roles in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Properties of Polycarboxylate Superplasticizers with Different Molecular Structure: A Comparative Study

Yang

Zhang

Mao

et al. 2023

KEM

View full text Add to dashboard Cite

Polycarboxylate superplasticizers (PCEs) with different molecular structure had been synthesized and characterized by FT-IR. PCEs were mainly included polyester (Type A), polyether (Type B) and ester ether copolymer (Type C). The application properties, adsorption behaviors and hydration process were investigated. The TOC was used to measure the adsorption amount, and crystal components in the hydration products were detected by XRD analysis. Test showed that Type B had the excellent performance, including large water reduction rate and strong adsorption capacity. The ester group in the molecular structure of Type A and C could improve the fluidity retention of cement paste, but the hydrolysis of ester group also weakened adsorption capacity on cement particles. In addition, in the cement-water-PCEs system, the difference of molecular structure would affect the early hydration process of cement slurry. For example, research indicated that the main hydration peak and maximum elevated temperature was delayed by adding PCEs. Through the examination of hydration products, it revealed that the intensity of calcium hydroxide (CH) and ettringite (AFt) peaks with Type B was higher than the other. The concrete application performance results indicated that PCEs had the basically equal contribution to the compressive strength. Keywords molecular structure; ester group; adsorption; hydration products; compressive strength

show abstract

Low Carbon Alkali-Activated Slag Binder and Its Interaction with Polycarboxylate Superplasticizer: Importance of Microstructural Design of the PCEs

Cited by 5 publications

References 42 publications

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Synthesis of Polycarboxylate Superplasticizers via Photoinitiated Radical Polymerization

Production of bio‐based concrete water reducers from renewable resources: a review

Properties of Polycarboxylate Superplasticizers with Different Molecular Structure: A Comparative Study

Contact Info

Product

Resources

About