Effect of Naphthalene-Based Superplasticizer and Polycarboxylic Acid Superplasticizer on the Properties of Sulfoaluminate Cement

Wu, Yonghua; Li, Guoxin; Tang, Shiying; Niu, Mengdie; Wu, Yang

doi:10.3390/ma14030662

Cited by 20 publications

(9 citation statements)

References 28 publications

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“…However, the high fluidity they caused could provide adverse effects, such as bleeding and phase separation. In order to eliminate these drawbacks of superplasticizers, the addition of viscosity-enhancing compounds was developed [ 41 , 42 ].…”

Section: Plasticizers and Superplasticizersmentioning

confidence: 99%

Concrete Strengthening by Introducing Polymer-Based Additives into the Cement Matrix—A Mini Review

2021

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The modern types of concrete are a mixture of aggregates, cement, water and optional additives and admixtures. In particular, polymer additives seem to be a promising type of component that can significantly change concrete and mortar properties. Currently, the most popular polymer additives include superplasticizers, latexes and redispersible powders. Moreover, in order to improve the properties of concrete-based composite admixtures, which enhance the resistance to cracking, polymer fibres and recycled polymers have been researched. All the types of polymeric materials mentioned above are broadly used in the construction industry. This work summarizes the current knowledge on the different types of popular polymeric additives. Moreover, it describes the correlation between the chemical structure of additives and the macro-behaviour of the obtained concrete.

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Section: Plasticizers and Superplasticizersmentioning

confidence: 99%

Concrete Strengthening by Introducing Polymer-Based Additives into the Cement Matrix—A Mini Review

2021

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“…The hydration rate of anhydrous calcium sulphoaluminate (C 4 A 3 S) is shown in Equation ( 4), and its hydration rate is extremely fast, which can make the 1 d strength of high-belite sulphoaluminate cement reach more than 85% of the final strength [31,34]. As can be seen from Figure 5, the content of hydrated calcium sulphoaluminate increases with the increase in nanosilica content at the same cement age, which also indicates that nanosilica can further promote the hydration process of anhydrous calcium sulphoaluminate (C 4 A 3 S).…”

Section: Xrd Analysismentioning

confidence: 99%

Study on the Influence of Nanosilica Sol on the Hydration Process of Different Kinds of Cement and Mortar Properties

Liu

et al. 2021

Materials

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Compared with nanosilica collected in a gaseous state, nanosilica sol has great economic value and application significance for improving the performance of concrete and mortar. In this study, the influence of nanosilica sol on the hydration process of different kinds of cement is studied by means of hydration heat analysis,X-ray diffraction analysis(XRD)and other methods, and the properties of mortar such as setting time, mechanical properties and porosity are also studied to characterize the influence of nanosilica sol on the macroscopic properties of mortar. The experimental results show that nanosilica sol can accelerate the hydration rate of two kinds of cement and promote the hydration reaction degree of cement, and this promotion effect increases with the increase in nanosilica sol content. At the same time, nanosilica sol can significantly shorten the setting time of the two kinds of cement, and it is more obvious with the increase in content. Excessive content of nanosilica sol will adversely affect the permeability resistance of mortar. It may be caused by the weak interval formed by nanosilica particle clusters in the mortar matrix, which can be supported by the mortar pore structure distribution test. At the same time, the influence of nanosilica sol on the hydration of the two kinds of cement is different, and the compressive strength of HBSAC cement mortar increases first and then decreases after adding nanosilica sol; However, the compressive strength of P·O 42.5 cement mortar increases gradually after adding nanometer silica sol. This shows that nanosilica sol does not effectively promote the hydration of β-C2S in high belite sulfoaluminate cement (HBSAC) mortar. Based on the above experimental results, it can be concluded that when the content of nanosilica sol is about 1%, it has the best promotion effect on the hydration of the two kinds of cement and the performance of mortar.

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“…2-acrylamide-2-methacrylic acid (AMPS) can be used as a monomer for PCE to achieve good clay resistance, because of its acylamino group and sulfonic group [13]. Wu et al found that the introduction of AMPS to the structure of PCE was beneficial to the clay resistance [14]. Nevertheless, owing to its poor calcium complexing ability, the slump loss of concrete would be serious.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Performance of HPEG-AA-AMPS-HPA Polycarboxylate Superplasticizer

Guo,

Wu,

Liu

et al. 2024

J. Phys.: Conf. Ser.

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An clay-resistance and slump-retaining polycarboxylate superplasticizer (PCE-RC) was synthesized using macro-monomer HPEG with different molecular weight, acrylic acid (AA), 2-acrylamide-2-methacrylic acid (AMPS) and 2-hydroxy-1-methylethyl acrylate (HPA) via H2O2-NaHSO3 redox initiator system. Effects of the acid-ether ratio, HPEG molecular weight, the amount of AMPS and HPA on the properties of PCE-RC in cement were discussed and the optimal molar ratio of HPEG3000, AA, AMPS and HPA was 1:4.5:0.1:0.1. As-synthesized polycarboxylate superplasticizer PCE-RC was characterized by GPC and FTIR. The performance of the cement paste doped with 2.0wt% montmorillonite (MMT) and concrete with cement containing MMT were tested in the presence of PCE. Results showed that cement doped with MMT performed superior fluidity and fluidity retention with the addition of PCE-RC. Compared with commercially available superplasticizer AS-KN, PCE-RC in concrete containing MMT presented better clay resistance and slump retaining performance due to the introduction of AMPS and HPA. Herein the negative charged sulfonic groups provided by AMPS could promote more PCE-RC to adsorb on MMT surface, resulting in the decrease of intercalated PCE-RC amount, which is in favor of clay resistance. While the usage of HPA monomer is beneficial for the slump-retaining ability of PCE-RC in cement due to the introduction of ester group.

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Effect of Naphthalene-Based Superplasticizer and Polycarboxylic Acid Superplasticizer on the Properties of Sulfoaluminate Cement

Cited by 20 publications

References 28 publications

Concrete Strengthening by Introducing Polymer-Based Additives into the Cement Matrix—A Mini Review

Concrete Strengthening by Introducing Polymer-Based Additives into the Cement Matrix—A Mini Review

Study on the Influence of Nanosilica Sol on the Hydration Process of Different Kinds of Cement and Mortar Properties

Synthesis and Performance of HPEG-AA-AMPS-HPA Polycarboxylate Superplasticizer

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