Prehydration of calcium sulfoaluminate (CSA) clinker at different relative humidities

Leyang Lv; Branko Šavija; Lin Li; Hongzhi Cui; Ningxu Han; Feng Xing

doi:10.1016/j.cemconres.2021.106423

Prehydration of calcium sulfoaluminate (CSA) clinker at different relative humidities

Leyang Lv, Branko Šavija, Lin Li, Hongzhi Cui, Ningxu Han, Feng Xing^*

^*Corresponding author for this work

Materials and Environment

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

7 Citations (Scopus)

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Abstract

The use of CSA cement in practice has been hindered by its unstable performance and short shelf-life caused by the prehydration of CSA clinker. In this study, the effect of ambient humidity on the prehydration rate and process of CSA clinker was investigated. The prehydration degree, ageing progress, and the dynamic change of mineral composition of CSA clinker exposed to five different relative humidities (ranging from 23% to 98%) for up to 180 days were studied. Experiments revealed that the ambient humidity of 60% RH can be considered a threshold value for storage of CSA clinker. Exposure of CSA clinker to RH higher than 60% will not only result in a significant decrease of hydraulic reactivity, but also in agglomeration of the clinker. Although the exposure of CSA clinker to RH lower than 60% has little effect on the hydraulic reactivity, the main hydration peak was found to be slightly delayed with the increase of RH.

Original language	English
Article number	106423
Pages (from-to)	1-14
Number of pages	14
Journal	Cement and Concrete Research
Volume	144
DOIs	https://doi.org/10.1016/j.cemconres.2021.106423
Publication status	Published - 2021

Bibliographical note

Accepted Author Manuscript

Keywords

Anhydrite
CSA cement
Phase assemblage
Prehydration
Ye'elimite

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10.1016/j.cemconres.2021.106423

PostPrintAccepted author manuscript, 2.24 MBLicence: CC BY-NC-ND

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title = "Prehydration of calcium sulfoaluminate (CSA) clinker at different relative humidities",

abstract = "The use of CSA cement in practice has been hindered by its unstable performance and short shelf-life caused by the prehydration of CSA clinker. In this study, the effect of ambient humidity on the prehydration rate and process of CSA clinker was investigated. The prehydration degree, ageing progress, and the dynamic change of mineral composition of CSA clinker exposed to five different relative humidities (ranging from 23% to 98%) for up to 180 days were studied. Experiments revealed that the ambient humidity of 60% RH can be considered a threshold value for storage of CSA clinker. Exposure of CSA clinker to RH higher than 60% will not only result in a significant decrease of hydraulic reactivity, but also in agglomeration of the clinker. Although the exposure of CSA clinker to RH lower than 60% has little effect on the hydraulic reactivity, the main hydration peak was found to be slightly delayed with the increase of RH.",

keywords = "Anhydrite, CSA cement, Phase assemblage, Prehydration, Ye'elimite",

author = "Leyang Lv and Branko {\v S}avija and Lin Li and Hongzhi Cui and Ningxu Han and Feng Xing",

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T1 - Prehydration of calcium sulfoaluminate (CSA) clinker at different relative humidities

AU - Lv, Leyang

AU - Šavija, Branko

AU - Li, Lin

AU - Cui, Hongzhi

AU - Han, Ningxu

AU - Xing, Feng

N1 - Accepted Author Manuscript

PY - 2021

Y1 - 2021

N2 - The use of CSA cement in practice has been hindered by its unstable performance and short shelf-life caused by the prehydration of CSA clinker. In this study, the effect of ambient humidity on the prehydration rate and process of CSA clinker was investigated. The prehydration degree, ageing progress, and the dynamic change of mineral composition of CSA clinker exposed to five different relative humidities (ranging from 23% to 98%) for up to 180 days were studied. Experiments revealed that the ambient humidity of 60% RH can be considered a threshold value for storage of CSA clinker. Exposure of CSA clinker to RH higher than 60% will not only result in a significant decrease of hydraulic reactivity, but also in agglomeration of the clinker. Although the exposure of CSA clinker to RH lower than 60% has little effect on the hydraulic reactivity, the main hydration peak was found to be slightly delayed with the increase of RH.

AB - The use of CSA cement in practice has been hindered by its unstable performance and short shelf-life caused by the prehydration of CSA clinker. In this study, the effect of ambient humidity on the prehydration rate and process of CSA clinker was investigated. The prehydration degree, ageing progress, and the dynamic change of mineral composition of CSA clinker exposed to five different relative humidities (ranging from 23% to 98%) for up to 180 days were studied. Experiments revealed that the ambient humidity of 60% RH can be considered a threshold value for storage of CSA clinker. Exposure of CSA clinker to RH higher than 60% will not only result in a significant decrease of hydraulic reactivity, but also in agglomeration of the clinker. Although the exposure of CSA clinker to RH lower than 60% has little effect on the hydraulic reactivity, the main hydration peak was found to be slightly delayed with the increase of RH.

KW - Anhydrite

KW - CSA cement

KW - Phase assemblage

KW - Prehydration

KW - Ye'elimite

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U2 - 10.1016/j.cemconres.2021.106423

DO - 10.1016/j.cemconres.2021.106423

M3 - Article

AN - SCOPUS:85102968117

SN - 0008-8846

VL - 144

SP - 1

EP - 14

JO - Cement and Concrete Research

JF - Cement and Concrete Research

M1 - 106423

ER -

Prehydration of calcium sulfoaluminate (CSA) clinker at different relative humidities

Abstract

Bibliographical note

Keywords

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