Effect of carbonated cement paste on composite cement hydration and performance

Maciej Zajac; Jan Skocek; Pawel Durdzinski; Frank Bullerjahn; Jørgen Skibsted; Mohsen Ben Haha

doi:10.1016/j.cemconres.2020.106090

Effect of carbonated cement paste on composite cement hydration and performance

Maciej Zajac^*, Jan Skocek, Pawel Durdzinski, Frank Bullerjahn, Jørgen Skibsted, Mohsen Ben Haha

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

153 Citations (Scopus)

Abstract

In this work carbonated cement paste from demolished concrete recycling has been investigated as an active SCM-like component of composite cement. Carbonation of hydrated cement paste results in formation of calcium carbonate and a silica-alumina gel. The gel is found to be a pozzolanic material with high reactivity. Its composition is similar to the glass phase of siliceous fly ash and hence its impact on the resulting hydrate assemblage is comparable. However, due to the high specific surface of the gel and its structure, the pozzolanic reaction is very rapid achieving degrees of reaction of 50% after one day of reaction. The formed calcium carbonate acts as a fine filler. As a result, composite cements containing carbonated recycled cement paste are characterized by a rapid strength gain and a dense microstructure already at early age.

Original language	English
Article number	106090
Journal	Cement and Concrete Research
Volume	134
ISSN	0008-8846
DOIs	https://doi.org/10.1016/j.cemconres.2020.106090
Publication status	Published - Aug 2020

Keywords

Hydration
Performance
Pozzolan
Recycling
Supplementary cementitious material

Access to Document

10.1016/j.cemconres.2020.106090

Cite this

@article{9e51370ec74042bab0707719cca1c474,

title = "Effect of carbonated cement paste on composite cement hydration and performance",

abstract = "In this work carbonated cement paste from demolished concrete recycling has been investigated as an active SCM-like component of composite cement. Carbonation of hydrated cement paste results in formation of calcium carbonate and a silica-alumina gel. The gel is found to be a pozzolanic material with high reactivity. Its composition is similar to the glass phase of siliceous fly ash and hence its impact on the resulting hydrate assemblage is comparable. However, due to the high specific surface of the gel and its structure, the pozzolanic reaction is very rapid achieving degrees of reaction of 50% after one day of reaction. The formed calcium carbonate acts as a fine filler. As a result, composite cements containing carbonated recycled cement paste are characterized by a rapid strength gain and a dense microstructure already at early age.",

keywords = "Hydration, Performance, Pozzolan, Recycling, Supplementary cementitious material",

author = "Maciej Zajac and Jan Skocek and Pawel Durdzinski and Frank Bullerjahn and J{\o}rgen Skibsted and {Ben Haha}, Mohsen",

year = "2020",

month = aug,

doi = "10.1016/j.cemconres.2020.106090",

language = "English",

volume = "134",

journal = "Cement and Concrete Research",

issn = "0008-8846",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Effect of carbonated cement paste on composite cement hydration and performance

AU - Zajac, Maciej

AU - Skocek, Jan

AU - Durdzinski, Pawel

AU - Bullerjahn, Frank

AU - Skibsted, Jørgen

AU - Ben Haha, Mohsen

PY - 2020/8

Y1 - 2020/8

N2 - In this work carbonated cement paste from demolished concrete recycling has been investigated as an active SCM-like component of composite cement. Carbonation of hydrated cement paste results in formation of calcium carbonate and a silica-alumina gel. The gel is found to be a pozzolanic material with high reactivity. Its composition is similar to the glass phase of siliceous fly ash and hence its impact on the resulting hydrate assemblage is comparable. However, due to the high specific surface of the gel and its structure, the pozzolanic reaction is very rapid achieving degrees of reaction of 50% after one day of reaction. The formed calcium carbonate acts as a fine filler. As a result, composite cements containing carbonated recycled cement paste are characterized by a rapid strength gain and a dense microstructure already at early age.

AB - In this work carbonated cement paste from demolished concrete recycling has been investigated as an active SCM-like component of composite cement. Carbonation of hydrated cement paste results in formation of calcium carbonate and a silica-alumina gel. The gel is found to be a pozzolanic material with high reactivity. Its composition is similar to the glass phase of siliceous fly ash and hence its impact on the resulting hydrate assemblage is comparable. However, due to the high specific surface of the gel and its structure, the pozzolanic reaction is very rapid achieving degrees of reaction of 50% after one day of reaction. The formed calcium carbonate acts as a fine filler. As a result, composite cements containing carbonated recycled cement paste are characterized by a rapid strength gain and a dense microstructure already at early age.

KW - Hydration

KW - Performance

KW - Pozzolan

KW - Recycling

KW - Supplementary cementitious material

UR - http://www.scopus.com/inward/record.url?scp=85085258835&partnerID=8YFLogxK

U2 - 10.1016/j.cemconres.2020.106090

DO - 10.1016/j.cemconres.2020.106090

M3 - Journal article

AN - SCOPUS:85085258835

SN - 0008-8846

VL - 134

JO - Cement and Concrete Research

JF - Cement and Concrete Research

M1 - 106090

ER -

Effect of carbonated cement paste on composite cement hydration and performance

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this