Relationship between the particle size and dosage of LDHs and concrete resistance against chloride ingress

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Abstract

The present study investigates the transport properties of cement mortar with Ca-Al-NO3 layered double hydroxides (LDHs). A co-precipitation method is applied to synthesize the Ca-Al-NO3 LDHs and the effect of the synthesis environment on the size and particle shape is studied. The synthesized Ca-Al-NO3 LDHs are analytically characterized by XRD, SEM and FTIR analyses. The relationships between the sizes and addition amount of Ca-Al-NO3 LDHs and the mechanical and transport properties of mortars are investigated. Rapid chloride migration (RCM) tests are performed to the cement mortars with Ca-Al-NO3 LDHs. The results show that permeability of the designed concrete decreased with the addition of Ca-Al-NO3 layered double hydroxides (LDHs). The decrease of chloride migration coefficients can be attributed to the enhanced barrier effect because of the increase of tortuosity. In long-term natural diffusion tests, LDHs present significantly enhanced barrier effect due to the combined chloride binding ability and improved tortuosity.
Original languageEnglish
Pages (from-to)81-90
Number of pages10
JournalCement and Concrete Research
Volume105
DOIs
Publication statusPublished - 2018

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Hydroxides
Mortar
Chlorides
Particle size
Concretes
Transport properties
Cements
Coprecipitation
Mechanical properties
Scanning electron microscopy

Cite this

@article{979ec754425348ebb221523d7b853cde,
title = "Relationship between the particle size and dosage of LDHs and concrete resistance against chloride ingress",
abstract = "The present study investigates the transport properties of cement mortar with Ca-Al-NO3 layered double hydroxides (LDHs). A co-precipitation method is applied to synthesize the Ca-Al-NO3 LDHs and the effect of the synthesis environment on the size and particle shape is studied. The synthesized Ca-Al-NO3 LDHs are analytically characterized by XRD, SEM and FTIR analyses. The relationships between the sizes and addition amount of Ca-Al-NO3 LDHs and the mechanical and transport properties of mortars are investigated. Rapid chloride migration (RCM) tests are performed to the cement mortars with Ca-Al-NO3 LDHs. The results show that permeability of the designed concrete decreased with the addition of Ca-Al-NO3 layered double hydroxides (LDHs). The decrease of chloride migration coefficients can be attributed to the enhanced barrier effect because of the increase of tortuosity. In long-term natural diffusion tests, LDHs present significantly enhanced barrier effect due to the combined chloride binding ability and improved tortuosity.",
author = "Z. Qu and Q. Yu and H.J.H. Brouwers",
year = "2018",
doi = "10.1016/j.cemconres.2018.01.005",
language = "English",
volume = "105",
pages = "81--90",
journal = "Cement and Concrete Research",
issn = "0008-8846",
publisher = "Elsevier",

}

Relationship between the particle size and dosage of LDHs and concrete resistance against chloride ingress. / Qu, Z.; Yu, Q.; Brouwers, H.J.H.

In: Cement and Concrete Research, Vol. 105, 2018, p. 81-90.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Relationship between the particle size and dosage of LDHs and concrete resistance against chloride ingress

AU - Qu, Z.

AU - Yu, Q.

AU - Brouwers, H.J.H.

PY - 2018

Y1 - 2018

N2 - The present study investigates the transport properties of cement mortar with Ca-Al-NO3 layered double hydroxides (LDHs). A co-precipitation method is applied to synthesize the Ca-Al-NO3 LDHs and the effect of the synthesis environment on the size and particle shape is studied. The synthesized Ca-Al-NO3 LDHs are analytically characterized by XRD, SEM and FTIR analyses. The relationships between the sizes and addition amount of Ca-Al-NO3 LDHs and the mechanical and transport properties of mortars are investigated. Rapid chloride migration (RCM) tests are performed to the cement mortars with Ca-Al-NO3 LDHs. The results show that permeability of the designed concrete decreased with the addition of Ca-Al-NO3 layered double hydroxides (LDHs). The decrease of chloride migration coefficients can be attributed to the enhanced barrier effect because of the increase of tortuosity. In long-term natural diffusion tests, LDHs present significantly enhanced barrier effect due to the combined chloride binding ability and improved tortuosity.

AB - The present study investigates the transport properties of cement mortar with Ca-Al-NO3 layered double hydroxides (LDHs). A co-precipitation method is applied to synthesize the Ca-Al-NO3 LDHs and the effect of the synthesis environment on the size and particle shape is studied. The synthesized Ca-Al-NO3 LDHs are analytically characterized by XRD, SEM and FTIR analyses. The relationships between the sizes and addition amount of Ca-Al-NO3 LDHs and the mechanical and transport properties of mortars are investigated. Rapid chloride migration (RCM) tests are performed to the cement mortars with Ca-Al-NO3 LDHs. The results show that permeability of the designed concrete decreased with the addition of Ca-Al-NO3 layered double hydroxides (LDHs). The decrease of chloride migration coefficients can be attributed to the enhanced barrier effect because of the increase of tortuosity. In long-term natural diffusion tests, LDHs present significantly enhanced barrier effect due to the combined chloride binding ability and improved tortuosity.

U2 - 10.1016/j.cemconres.2018.01.005

DO - 10.1016/j.cemconres.2018.01.005

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SP - 81

EP - 90

JO - Cement and Concrete Research

JF - Cement and Concrete Research

SN - 0008-8846

ER -