Improving structural build-up of limestone-calcined clay-cement pastes by using inorganic additives

Yu Chen; Yu Zhang; Shan He; Xuhui Liang; Erik Schlangen; Oğuzhan Çopuroğlu

doi:10.1016/j.conbuildmat.2023.131959

Improving structural build-up of limestone-calcined clay-cement pastes by using inorganic additives

Yu Chen
, Yu Zhang
, Shan He
, Xuhui Liang
, Erik Schlangen
, Oğuzhan Çopuroğlu

Delft University of Technology

Research output: Contribution to journal › Article › peer-review

23 Citations (SciVal)

Abstract

In 3D concrete printing, fast structuration is a prerequisite for ideal buildability. This paper aims to study the impact of inorganic additives, i.e., CaCl₂ and gypsum, on structural build-up and very early-age hydration of limestone-calcined clay-cement (LC3) pastes within the first 70–80 min. Results show that, increasing the dosage of CaCl₂ or gypsum can accelerate storage modulus G' and static yield stress evolution with time, as well as increase chemically bound water (H) content and total specific surface area (SSA_total). Furthermore, good correlations were found between G' and H content, as well as static yield stress and the ratio of free water content to SSA_total. The acceleration by CaCl₂ can be attributed to stimulating C₃S and C₃A hydration and promoting crystal formation, i.e., ettringite, portlandite, and Friedel's salt. Additionally, the increase in gypsum percentage led to a large amount of unreacted gypsum in the system, resulting in an increase in SSA_total.

Original language	English
Article number	131959
Journal	Construction and Building Materials
Volume	392
Early online date	2 Jun 2023
DOIs	https://doi.org/10.1016/j.conbuildmat.2023.131959
Publication status	Published - 15 Aug 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2023 The Author(s)

Acknowledgements

The authors wish to thank Mr. Arjan Thijssen and Mr. John van den Berg for their support in XRD and SSA measurement.

Funding

Yu Zhang and Xuhui Liang want to acknowledge the funding supported by China Scholarship Council under grant No. 201808320456, 201806050051.

Keywords

3D concrete printing
CaCl
Gypsum
Limestone-calcined clay-cement
Rheology
Structural build-up
Very early-age hydration

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

Access to Document

10.1016/j.conbuildmat.2023.131959Licence: CC BY

Cite this

@article{2eb85392a2d743b6a77b485fd14a8936,

title = "Improving structural build-up of limestone-calcined clay-cement pastes by using inorganic additives",

abstract = "In 3D concrete printing, fast structuration is a prerequisite for ideal buildability. This paper aims to study the impact of inorganic additives, i.e., CaCl2 and gypsum, on structural build-up and very early-age hydration of limestone-calcined clay-cement (LC3) pastes within the first 70–80 min. Results show that, increasing the dosage of CaCl2 or gypsum can accelerate storage modulus G' and static yield stress evolution with time, as well as increase chemically bound water (H) content and total specific surface area (SSAtotal). Furthermore, good correlations were found between G' and H content, as well as static yield stress and the ratio of free water content to SSAtotal. The acceleration by CaCl2 can be attributed to stimulating C3S and C3A hydration and promoting crystal formation, i.e., ettringite, portlandite, and Friedel's salt. Additionally, the increase in gypsum percentage led to a large amount of unreacted gypsum in the system, resulting in an increase in SSAtotal.",

keywords = "3D concrete printing, CaCl, Gypsum, Limestone-calcined clay-cement, Rheology, Structural build-up, Very early-age hydration",

author = "Yu Chen and Yu Zhang and Shan He and Xuhui Liang and Erik Schlangen and Oğuzhan {\c C}opuroğlu",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s)",

year = "2023",

month = aug,

day = "15",

doi = "10.1016/j.conbuildmat.2023.131959",

language = "English",

volume = "392",

journal = "Construction and Building Materials",

issn = "0950-0618",

publisher = "Elsevier",

}

TY - JOUR

T1 - Improving structural build-up of limestone-calcined clay-cement pastes by using inorganic additives

AU - Chen, Yu

AU - Zhang, Yu

AU - He, Shan

AU - Liang, Xuhui

AU - Schlangen, Erik

AU - Çopuroğlu, Oğuzhan

PY - 2023/8/15

Y1 - 2023/8/15

N2 - In 3D concrete printing, fast structuration is a prerequisite for ideal buildability. This paper aims to study the impact of inorganic additives, i.e., CaCl2 and gypsum, on structural build-up and very early-age hydration of limestone-calcined clay-cement (LC3) pastes within the first 70–80 min. Results show that, increasing the dosage of CaCl2 or gypsum can accelerate storage modulus G' and static yield stress evolution with time, as well as increase chemically bound water (H) content and total specific surface area (SSAtotal). Furthermore, good correlations were found between G' and H content, as well as static yield stress and the ratio of free water content to SSAtotal. The acceleration by CaCl2 can be attributed to stimulating C3S and C3A hydration and promoting crystal formation, i.e., ettringite, portlandite, and Friedel's salt. Additionally, the increase in gypsum percentage led to a large amount of unreacted gypsum in the system, resulting in an increase in SSAtotal.

AB - In 3D concrete printing, fast structuration is a prerequisite for ideal buildability. This paper aims to study the impact of inorganic additives, i.e., CaCl2 and gypsum, on structural build-up and very early-age hydration of limestone-calcined clay-cement (LC3) pastes within the first 70–80 min. Results show that, increasing the dosage of CaCl2 or gypsum can accelerate storage modulus G' and static yield stress evolution with time, as well as increase chemically bound water (H) content and total specific surface area (SSAtotal). Furthermore, good correlations were found between G' and H content, as well as static yield stress and the ratio of free water content to SSAtotal. The acceleration by CaCl2 can be attributed to stimulating C3S and C3A hydration and promoting crystal formation, i.e., ettringite, portlandite, and Friedel's salt. Additionally, the increase in gypsum percentage led to a large amount of unreacted gypsum in the system, resulting in an increase in SSAtotal.

KW - 3D concrete printing

KW - CaCl

KW - Gypsum

KW - Limestone-calcined clay-cement

KW - Rheology

KW - Structural build-up

KW - Very early-age hydration

UR - https://www.scopus.com/pages/publications/85163552477

U2 - 10.1016/j.conbuildmat.2023.131959

DO - 10.1016/j.conbuildmat.2023.131959

M3 - Article

AN - SCOPUS:85163552477

SN - 0950-0618

VL - 392

JO - Construction and Building Materials

JF - Construction and Building Materials

M1 - 131959

ER -

Improving structural build-up of limestone-calcined clay-cement pastes by using inorganic additives

Abstract

Bibliographical note

Acknowledgements

Funding

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this