A novel shrinkage-reducing polycarboxylate superplasticizer for cement-based materials: Synthesis, performance and mechanisms

Zhang, Jian; Ma, Yuefeng; Wang, Jun; Gao, Nanxiao; Hu, Zhaoyang; Liu, Jiaping; Wang, Kangchen

doi:10.1016/j.conbuildmat.2022.126342

Cited by 29 publications

(16 citation statements)

References 55 publications

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“…Therefore, a plausible explanation for this morphology change is that the PCA and SR‐PCA coat at the spherical precursors, disperse the C–S–H uniformly, and strongly delay its growth into the stretched foil‐like structure. This delay effect agrees well with their retardation effect on cement hydration, as reported in the previous study 26 …”

Section: Resultssupporting

confidence: 93%

“…The chemical structure of PCA and SR-PCA is displayed in Figure 1, and their molecular properties are listed in Table 1. 26 Specifically, for PCA and SR-PCA, the molar ratios between carboxylate (m) and ether (n) were 4:1 and 2:1, respectively. The molar ratio of carboxylate (m) to ester (q) in SR-PCA was 2:1.…”

Section: Methodsmentioning

confidence: 98%

“…A novel SR-PCA, the detailed synthesis process of which was reported in Ref. [26], was employed to study its impact on the nature of C-S-H. For comparison, a commercial superplasticizer labeled PCA was also used in this work. The chemical structure of PCA and SR-PCA is displayed in Figure 1, and their molecular properties are listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

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Influence of novel shrinkage‐reducing polycarboxylate superplasticizer on the nature of calcium–silicate–hydrates

Liu

Huang

et al. 2022

J Am Ceram Soc.

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Currently, a novel shrinkage-reducing polycarboxylate superplasticizer (SR-PCA) is used to control cementitious shrinkage. To clarify its mechanism when applied in cementitious materials, the influence of SR-PCA on the composition, morphology, and structure of synthetic calcium-silicate-hydrate (C-S-H), together with the interaction between SR-PCA and C-S-H at the atomic level, is investigated. For comparison, a commercial polycarboxylate superplasticizer (PCA) is also employed. The results show PCA and SR-PCA can adsorb on the C-S-H surface rather than intercalate into the layers. Compared with PCA, SR-PCA has a milder impact on C-S-H crystallinity. SR-PCA refines the pore structure of C-S-H drastically, whereas PCA loosens the structure by increasing the mesopore volume. In addition, the adsorption effect of SR-PCA on the C-S-H surface is less significant than that of PCA. At the atomic level, this less adsorption of SR-PCA is attributed to the lower adhesion energy of the C-S-H/SR-PCA interface due to the weaker Ca-O bond strength.

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Section: Resultssupporting

confidence: 93%

Section: Methodsmentioning

confidence: 98%

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Influence of novel shrinkage‐reducing polycarboxylate superplasticizer on the nature of calcium–silicate–hydrates

Liu

Huang

et al. 2022

J Am Ceram Soc.

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“…It has infinite structure and performance design space. Various polycarboxylate superplasticizers can be produced with different properties and characteristics by changing the types, proportions, and reaction conditions of polymerized monomers [26]. Compared with other water-reducing agents, a polycarboxylate superplasticizer with good dispersion requires a lower dosage but offers a higher water reduction rate.…”

Section: Introductionmentioning

confidence: 99%

Study on the Hydration and Physical Properties of Cement by M18 Polycarboxylate Superplasticizer Modified Graphene Oxide

Liao¹,

Li²,

Zhou³

et al. 2023

Journal of Renewable Materials

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Graphene oxide (GO) as a new nano-enhancer in cement-based materials has gained wide attention. However, GO is easy to aggregate in alkaline cement mortar with poor dispersibility. This hinders its application in practical infrastructure construction. In this work, GO-M18 polycarboxylate compound superplasticizer (GM) were obtained by compounding the M18 polycarboxylate superplasticizer with GO solution at different mass ratios. The dispersion of GM in alkaline solution was systematically studied. The phases and functional groups of GM were characterized by XRD and FTIR. The effects of GM on the cement mortar hydration and the formation of microstructure were investigated by measuring the heat of hydration, MIP, TG/DSC, and SEM. The results show that the long-chain structure of the M18 polycarboxylate superplasticizer can increase the interlayer spacing of GO and weaken the force between GO sheets. The modified GO can be uniformly dispersed in the cement slurry. GM can accelerate the early hydration process of cement, which can increase the content of Ca(OH) 2 and decrease the grain size. It can optimize the pore size distribution of cement-based materials, increase the density of harmless and less harmful pores, thereby improving mechanical properties. Such methods can transform traditional cement-based materials into stronger, more durable composites, which prolong the life of cementbased materials and reduce the amount of cement used for later maintenance. This provides an idea for achieving sustainability goals in civil engineering.

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“…As a functional PCE, SRP not only has the advantages of high water-reduction and strong dispersion performance but also has the superiority of reducing shrinkage of cement-based materials. In recent years, SRP has attracted significant attention and some patents [ 20 , 21 , 22 , 23 , 24 ] and research results have been publicly reported [ 25 , 26 ]. In the current research, the shrinkage-reducing monomers used in the preparation process of SRP were usually obtained by the esterification of unsaturated carboxylic acid and alcohol-based shrinkage-reducing components.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Performances of Shrinkage-Reducing Polycarboxylate Superplasticizer in Cement-Based Materials

Liu

et al. 2022

Materials

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Reducing or eliminating cracks caused by shrinkage of cementitious materials remains a daunting challenge for construction engineers. Drying shrinkage and autogenous shrinkage are the main shrinkage types in the service process of cement−based materials, which have a great impact on engineering applications. If cracks in concrete generate by drying or autogenous shrinkage, the mechanical properties, water resistance and durability of concrete will be also affected. It is an effective method to use chemical admixtures to inhibit the shrinkage of cement−based materials. Polycarboxylate plasticizer (PCE) is an important chemical admixture in cement−based materials and is widely used in practical engineering. It can bring great value by reducing the shrinkage effect through molecular design. Through our innovative design, a series of shrinkage−reducing polycarboxylate superplasticizers (SRPs) were synthesized, their molecular structures were confirmed by Fourier transform infrared spectroscopy (FTIR) and their molecular properties were determined by gel permeation chromatography (GPC). Furthermore, the shrinkage performances at different ages of the mortars containing the synthesized SRPs with different structures were systematically evaluated. The results showed that compared with the blank sample, the dry shrinkage rate and free shrinkage rate of the mortars containing SRP decreased by over 20% and 15%, respectively. Additionally, the shrinkage rates of the mortars containing SRP were significantly lower than that of the mortar containing conventional PCE, and moreover, the water−reducing performance was improved compared to conventional PCE. Based on the experimental results of surface tension and evaporation rate of different SRP solutions, the mechanism of the shrinkage−reducing effect was probed, as expected to provide guidance for the design and development of new shrinkage−reducing admixtures.

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A novel shrinkage-reducing polycarboxylate superplasticizer for cement-based materials: Synthesis, performance and mechanisms

Cited by 29 publications

References 55 publications

Influence of novel shrinkage‐reducing polycarboxylate superplasticizer on the nature of calcium–silicate–hydrates

Influence of novel shrinkage‐reducing polycarboxylate superplasticizer on the nature of calcium–silicate–hydrates

Study on the Hydration and Physical Properties of Cement by M18 Polycarboxylate Superplasticizer Modified Graphene Oxide

Synthesis and Performances of Shrinkage-Reducing Polycarboxylate Superplasticizer in Cement-Based Materials

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