Absorption conformations in the intercalation process of polycarboxylate ether based superplasticizers into montmorillonite clay

Borralleras, Pere; Segura, Ignacio; Aranda, Miguel A. G.; Aguado, Antonio

doi:10.1016/j.conbuildmat.2019.08.038

Cited by 19 publications

(8 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the mixture of SSB/PCE exhibited a d spacing of 1.44 nm, which was smaller than the d spacing of MMT with PCE. According to the research of Ignacio et al., [ 10,11 ] the d spacing of MMT expands with an increase of dosage of PCE, therefore smaller d spacing of MMT with SSB/PCE means that MMT has adsorbed less PCE through the intercalation into the alumosilicate layers. In other words, there was competitive adsorption between SSB and PCE on MMT.…”

Section: Resultsmentioning

confidence: 99%

“…e These clays have swelling properties, especially for montmorillonite clays which has a 2:1 type structure consisting of two silicon‐oxygen tetrahedral sheets sandwiching one alumina octahedral sheet. [ 6–9 ] According to the X‐ray Diffraction (XRD) and the in situ‐XRD analysis, [ 10,11 ] the PEO side chains can easily insert into the sandwich‐like structure, which could induce serve destruction in the dispersibility of the cement particles. [ 10–14 ] Therefore, the compatibility between PCE and clay has attracted significant research attention.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and Properties of a Starch‐based Clay Tolerance Sacrificial Agent

Gao

Wang

2021

Starch Stärke

View full text Add to dashboard Cite

For improving the workability of clay‐containing cement paste superplasticized by polycarboxylate ether (PCE), a new starch‐based sacrificial agent is synthesized in the following two steps: first, the starch is sulfonated to obtain sulfonated starch (SS) with a strong steric effect, which is verified through its dispersion performance; then, SS is quaternized to obtain starch‐based sacrificial agent (SSB). The structure of SSB is characterized by FT‐IR and element analysis. Montmorillonite (MMT), as the most detrimental clay, strongly perturbs the dispersing power of conventional PCE. Therefore, the MMT‐tolerance property of SSB is tested. With the addition of 0.02 wt.% SSB, the fluidity of MMT‐containing cement paste is increased from 191.5 to 222 mm and the rheological property of MMT‐containing cement paste is improved by reducing the yield stress and the flow index (τ0 and n in Herschel‐Bulkley model). Adsorption experiments, DLS, and XRD are used for explaining SSB's clay‐tolerance mechanism. Adsorption experiments show that the cationic group enhanced the interaction between MMT and SSB; DLS and XRD demonstrated that SSB is adsorbed on MMT through electrostatic attraction and could hinder the interaction between PCE and MMT by its high steric effect.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of a Starch‐based Clay Tolerance Sacrificial Agent

Gao

Wang

2021

Starch Stärke

View full text Add to dashboard Cite

show abstract

“…MMT has a scalable interlayer structure compared with other clays and the water and some cations (such as Na + , Ca 2+ ) existed in the interlayer, and the long side chains PEG of PCE can be intercalated into the interlayer spacing of MMT. Therefore, MMT has a significant inhibition effect on the dispersing function of PCE 11–14 …”

Section: Introductionmentioning

confidence: 99%

Synthesis of polycarboxylate superplasticizer modified by β‐cyclodextrin for possessing clay tolerance

Jin

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polycarboxylate superplasticizer (PCE) is widely used in concrete, but the clay content in the aggregate is increasing at present, which seriously weakens the dispersing function of PCE. Therefore, in order to lower the sensitivity of PCE to the clay, β‐cyclodextrin (β‐CD) was used for synthesizing anti‐clay polycarboxylate superplasticizers (AC‐PCE). Firstly, the clay tolerance property of AC‐PCE was explored by the fluidity and rheological test; then, the PCE was mixed with montmorillonite (MMT), and interaction mechanism was studied. The results showed that compared with the conventional polycarboxylate superplasticizer (CO‐PCE), an increase of 19.5% and 14.9% was observed in the fluidity of cement paste and mortar for AC‐PCE, indicating that the sensitivity of AC‐PCE to the clay was lower than that of CO‐PCE. Both CO‐PCE and AC‐PCE were adsorpted on MMT. XRD results showed that intercalation adsorption had occurred for both CO‐PCE and AC‐PCE. N2 adsorption results showed that although AC‐PCE was also inserted into the interlayer of MMT, its adsorption amount was lower than that of CO‐PCE due to steric hindrance from β‐CD, which increased the sorption level of the AC‐PCE on the cement clinkers particles. Therefore, the clay tolerance of PCE was enhanced significantly by β‐CD.

show abstract

“…This overall better dispersion from PCE can be attributed to the effects of the steric hindrance from its side chains [ 6 ]. However, PCEs are adsorbed more strongly by clays than polycondensates since PCE can interact with clays by not only physisorption (surface adsorption) vis hydrogen bonding from polymers’ side chains or electrostatic adsorption from the anchoring group of polymers but also by chemisorption (intercalation) while polycondensates are only consumed by surface interactions [ 7 , 8 , 9 , 10 ]. In all of different types of clay, montmorillonite shows the most deleterious influence on the adsorption of PCE onto cement particles as compared with kaolinite, feldspar and mica.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Adsorption on Large Bibulous Stone Powder

Deng

et al. 2021

Materials

View full text Add to dashboard Cite

The aim of this paper is to study the adsorption behavior of polycarboxylate superplasticizers (PCE) on coarse aggregates with a property of high water consumption (above 2%). The coarse aggregates were ground into a powder to create large bibulous stone powder, and it was observed that significant amounts of the ether-based PCE were absorbed onto large bibulous stone powder. The adsorption rate immediately reached a maximum after 5 min and then gradually decreased until an equilibrium absorption was established after 30 min. Zeta potential, infrared spectroscopy, and thermogravimetric analysis (TGA) measurements confirmed that the polycarboxylate superplasticizer adsorbed on the surface of the stone powder. Hydrodynamic diameter measurements showed that the polycarboxylate superplasticizer molecules were smaller than pore size, and the surface area and pore volume were reduced by the polymer incorporation in the pores.

show abstract

Absorption conformations in the intercalation process of polycarboxylate ether based superplasticizers into montmorillonite clay

Cited by 19 publications

References 44 publications

Synthesis and Properties of a Starch‐based Clay Tolerance Sacrificial Agent

Synthesis and Properties of a Starch‐based Clay Tolerance Sacrificial Agent

Synthesis of polycarboxylate superplasticizer modified by β‐cyclodextrin for possessing clay tolerance

Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Adsorption on Large Bibulous Stone Powder

Contact Info

Product

Resources

About