The influence of main and side chain densities of PCE superplasticizer on engineering properties and microstructure development of slag and fly ash ternary blended cement concrete

Ng, P. G.; Cheah, Chee Ban; Ng, Eng-Poh; Oo, Chuan Wei; Leow, Khang Heng

doi:10.1016/j.conbuildmat.2020.118103

Cited by 21 publications

(4 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When AH 3 complexes with PCE and the complex adsorbs on the surface of AH 3 , repulsion occurs between adjacent AH 3 particles, which improves the dispersion properties. 32 When the PCE content in AH 3 -PCE is high (P6), complexation of one PCE molecule may occur with multiple AH 3 molecules 37,38 leading to an increase in particle size. In general, the particle size of AH 3 -PCE ultrafine composites was affected by PCE content.…”

Section: Role Of Ah 3 -Pce Ultrafinementioning

confidence: 99%

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Li,

Hu,

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The use of superfine particles has been found to be a promising method for accelerating cement hydration. Amorphous aluminum hydroxide (AH3) is a key hydration product in sulfoaluminate cements and our preliminary research work indicated that the ultrafine amorphous AH3 accelerates the hydration rate of sulfoaluminate cement-based grouting materials (SAGMs). However, the ultrafine AH3 tends to agglomerate easily, which affects its effectiveness. In this study, aluminum hydroxide-polycarboxylic acid superplasticizer (AH3-PCE) ultrafine composites were prepared using the sol–gel method, and their effect on the hydration and hardening process of SAGMs was investigated. The results showed that the particle size of the AH3-PCE ultrafine composites decreased and then increased with increasing amount of PCE and there was a strong interaction of AH3 with PCE through the oxygen atoms of C–O–C. AH3-PCE ultrafine composites provided nucleation for the growth of bayerite and ettringite (AFt). Moreover, the AH3-PCE ultrafine composites released aluminum ions and PCE in an alkaline solution at pH 12.5. The AH3-PCE ultrafine composites promoted cement hydration, adjusted the pore structure of the hardened paste, and improved the compressive strength at all ages owing to the synergistic effect of nucleation, aluminum ions, and PCE released from the AH3-PCE ultrafine composite.

show abstract

Section: Role Of Ah 3 -Pce Ultrafinementioning

confidence: 99%

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Li,

Hu,

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The results indicate that, when the IPEG content is high, the molecular weight is around 40,000, and the molecular weight distribution is narrow, the dispersion effect of PCE is the best. In a separate investigation conducted by Ng et al [8], an amide structure PCE was synthesized through the amidation reaction between amino methoxy polyethylene glycol (AMPG) and polyacrylic acid (PAA) at temperatures ranging from 130 to 150 • C. In the research conducted by Dalas et al [9], the macromonomer employed was butyryl alkyl polyoxyethylene polyoxypropylene ether (BAPP), and 2,2azobisisobutyronitrile served as the initiator. The reaction was initiated under a nitrogen atmosphere at 70 • C for 48 h, aiming to synthesize polycarboxylates with the capability to significantly expedite cement hydration.…”

Section: Introductionmentioning

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

“…Polycarboxylate superplasticizer (PCE) (Ng et al, 2020;Li et al, 2021;Xu et al, 2021) as an important concrete admixture is currently most commonly used as a large monomer, which can be mainly divided into two types: polyester-based and ether-based. The following three types of large monomers are commonly used: The first type is the traditional polyester-based monomer, represented by methoxy polyethylene glycol ether (MPEG) (Tian Y F et al, 2014), which is mainly prepared by esterification and polymerization reactions, with complex processes, low efficiency, and low polymerization activity.…”

Section: Introductionmentioning

confidence: 99%

Study on rheological, adsorption and hydration properties of cement slurries incorporated with EPEG-based polycarboxylate superplasticizers

Fang,

Wang,

Yan

et al. 2024

Front. Mater.

View full text Add to dashboard Cite

A series of polycarboxylate superplasticizers (PCEs) with different side-chain densities, main chain polymerization degrees, and side-chain lengths were designed and synthesized using a novel highly active ethylene glycol mono vinyl ether polyethylene glycol as the ether monomer. The influence of polycarboxylate ether on the rheological properties, interface adsorption, and hydration characteristics in cement paste was investigated through characterization of charge density, rheological properties, adsorption behavior, and hydration heat. The results indicate that the adsorption process of PCE on cement particles is spontaneous physical adsorption, and the hydration kinetics fitting reveals that the geometric crystal growth exponent n is in the range of 1–2, with needle-like and lamellar hydration products formed. With a decrease in side-chain density, the broadening of molecular weight distribution and the increase of charge density accelerate the flow of slurry, reduces saturation adsorption, and delays cement hydration. A decrease in main chain polymerization degree results in a downward trend in molecular weight and charge density, leading to larger molecular conformations, reduced slurry flow, decreased saturation adsorption, and delayed cement hydration. As the side-chain length of PCE (molecular weight) increases, the charge density decreases, and the molecular conformation exhibits a compact structure with reduced slurry flow, decreased saturation adsorption, and delayed cement hydration. In cases of low side-chain density, short side chains, and low molecular weight, enhanced adsorption capacity and faster adsorption rates are observed, resulting in the lower viscosity and a delay in the cement hydration process.

show abstract

The influence of main and side chain densities of PCE superplasticizer on engineering properties and microstructure development of slag and fly ash ternary blended cement concrete

Cited by 21 publications

References 76 publications

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Synthesis and Modification of Polycarboxylate Superplasticizers—A Review

Study on rheological, adsorption and hydration properties of cement slurries incorporated with EPEG-based polycarboxylate superplasticizers

Contact Info

Product

Resources

About

The influence of main and side chain densities of PCE superplasticizer on engineering properties and microstructure development of slag and fly ash ternary blended cement concrete

Cited by 21 publications

References 76 publications

Effect of AH3-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Effect of AH3-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Synthesis and Modification of Polycarboxylate Superplasticizers—A Review

Study on rheological, adsorption and hydration properties of cement slurries incorporated with EPEG-based polycarboxylate superplasticizers

Contact Info

Product

Resources

About

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials