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Effect of admixture on the pore structure refinement and enhanced performance of alkali-activated fly ash-slag concrete. / Keulen, A.; Yu, Q. L.; Zhang, S.; Grünewald, S.

In: Construction and Building Materials, Vol. 162, 20.02.2018, p. 27-36.

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@article{8ef277057a35463e921211f17589ab53,
title = "Effect of admixture on the pore structure refinement and enhanced performance of alkali-activated fly ash-slag concrete",
abstract = "This paper investigates the influence of a plasticizing admixture on the pore structure refinement of alkali-activated concrete and paste mixtures and the consequently enhanced performance. Alkali-activated fly ash-slag concrete and paste are designed using a polycarboxylate-based admixture with different dosages. The pore structure and porosity are analyzed using mercury intrusion porosimetry (MIP). The workability, compressive strength, chloride migration resistance and electrical resistivity of alkali-activated fly ash-slag concrete and paste are determined. The results show that significantly improved workability and strength development are obtained at an increased admixture content. The admixture improves the gel polymerization product layer most likely around the GGBS particles, densifying the matrix. The 28-day Cl-migration coefficient of admixture (1–2 kg/m3) modified concrete is equal to the reference mixture, while at the highest admixture content the Cl-ingress is increased. At the later ages (91-days), the Cl-migration coefficients of all concretes, non- and admixture-containing samples, are comparable and low (about 2.6 × 10−12 m2/s). The MIP analyses show a significant decrease of the total and effective capillary porosity over time at an increased admixture content. The relationships between the porosity and other properties are discussed, at varying admixture contents.",
keywords = "Admixture, Alkali activated fly ash-slag concrete, Chloride migration, Compressive strength, Microstructure, Pore structure, Workability",
author = "A. Keulen and Yu, {Q. L.} and S. Zhang and S. Gr{\"u}newald",
year = "2018",
month = feb,
day = "20",
doi = "10.1016/j.conbuildmat.2017.11.136",
language = "English",
volume = "162",
pages = "27--36",
journal = "Construction and Building Materials",
issn = "0950-0618",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Effect of admixture on the pore structure refinement and enhanced performance of alkali-activated fly ash-slag concrete

AU - Keulen, A.

AU - Yu, Q. L.

AU - Zhang, S.

AU - Grünewald, S.

PY - 2018/2/20

Y1 - 2018/2/20

N2 - This paper investigates the influence of a plasticizing admixture on the pore structure refinement of alkali-activated concrete and paste mixtures and the consequently enhanced performance. Alkali-activated fly ash-slag concrete and paste are designed using a polycarboxylate-based admixture with different dosages. The pore structure and porosity are analyzed using mercury intrusion porosimetry (MIP). The workability, compressive strength, chloride migration resistance and electrical resistivity of alkali-activated fly ash-slag concrete and paste are determined. The results show that significantly improved workability and strength development are obtained at an increased admixture content. The admixture improves the gel polymerization product layer most likely around the GGBS particles, densifying the matrix. The 28-day Cl-migration coefficient of admixture (1–2 kg/m3) modified concrete is equal to the reference mixture, while at the highest admixture content the Cl-ingress is increased. At the later ages (91-days), the Cl-migration coefficients of all concretes, non- and admixture-containing samples, are comparable and low (about 2.6 × 10−12 m2/s). The MIP analyses show a significant decrease of the total and effective capillary porosity over time at an increased admixture content. The relationships between the porosity and other properties are discussed, at varying admixture contents.

AB - This paper investigates the influence of a plasticizing admixture on the pore structure refinement of alkali-activated concrete and paste mixtures and the consequently enhanced performance. Alkali-activated fly ash-slag concrete and paste are designed using a polycarboxylate-based admixture with different dosages. The pore structure and porosity are analyzed using mercury intrusion porosimetry (MIP). The workability, compressive strength, chloride migration resistance and electrical resistivity of alkali-activated fly ash-slag concrete and paste are determined. The results show that significantly improved workability and strength development are obtained at an increased admixture content. The admixture improves the gel polymerization product layer most likely around the GGBS particles, densifying the matrix. The 28-day Cl-migration coefficient of admixture (1–2 kg/m3) modified concrete is equal to the reference mixture, while at the highest admixture content the Cl-ingress is increased. At the later ages (91-days), the Cl-migration coefficients of all concretes, non- and admixture-containing samples, are comparable and low (about 2.6 × 10−12 m2/s). The MIP analyses show a significant decrease of the total and effective capillary porosity over time at an increased admixture content. The relationships between the porosity and other properties are discussed, at varying admixture contents.

KW - Admixture

KW - Alkali activated fly ash-slag concrete

KW - Chloride migration

KW - Compressive strength

KW - Microstructure

KW - Pore structure

KW - Workability

UR - http://www.scopus.com/inward/record.url?scp=85037522053&partnerID=8YFLogxK

U2 - 10.1016/j.conbuildmat.2017.11.136

DO - 10.1016/j.conbuildmat.2017.11.136

M3 - Article

AN - SCOPUS:85037522053

VL - 162

SP - 27

EP - 36

JO - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

ER -

ID: 35202295