The effect of calcium lignosulfonate on ettringite formation in cement paste

The effect of a softwood calcium lignosulfonate, LSs, on the ettringite formed in cement paste was investigated. Two Portland cements, mainly differing in surface area and C3A content, were used. The effect of LSs addition time was studied, by adding either the LSs immediately with the mixing water...

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Published in:Cement and concrete research 2018-05, Vol.107, p.188-205
Main Authors: Colombo, A., Geiker, M., Justnes, H., Lauten, R.A., De Weerdt, K.
Format: Article
Language:English
Subjects:
ADSORPTION
Calcium
CALCIUM COMPOUNDS
Cement
Cement hydration
Cement paste
Concrete
CRYSTALS
Ettringite
Fresh cement paste
Hydrated surface area
HYDRATION
Incompatibility
Lignosulfonate
Lignosulfonates
MATERIALS SCIENCE
PARTICLES
PLASTICIZERS
PORTLAND CEMENT
Portland cements
SULFONATES
SURFACE AREA
Tricalcium aluminum ferrite
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cited_by cdi_FETCH-LOGICAL-c371t-bb20f09519d13b27262263d27f2c8eb871d034b6d66869790e76aa2e51e79d5c3
cites cdi_FETCH-LOGICAL-c371t-bb20f09519d13b27262263d27f2c8eb871d034b6d66869790e76aa2e51e79d5c3
container_end_page 205
container_issue
container_start_page 188
container_title Cement and concrete research
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creator Colombo, A.
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Lauten, R.A.
De Weerdt, K.
description The effect of a softwood calcium lignosulfonate, LSs, on the ettringite formed in cement paste was investigated. Two Portland cements, mainly differing in surface area and C3A content, were used. The effect of LSs addition time was studied, by adding either the LSs immediately with the mixing water or after 10 min of hydration. After 30 min of hydration of both cement pastes, the immediate addition of LSs caused the formation of numerous small ettringite crystals. The ettringite crystals had similar shape in pastes with and without LSs addition: cubic or cuboidal shape with length between 0.1 and 0.4 μm. These small particles caused an increase in surface area, which in turn increased the LSs adsorption by the cement paste. This could potentially lead to incompatibility issues between cement and plasticizer.
doi_str_mv 10.1016/j.cemconres.2018.02.021
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source Elsevier
subjects ADSORPTION
Calcium
CALCIUM COMPOUNDS
Cement
Cement hydration
Cement paste
Concrete
CRYSTALS
Ettringite
Fresh cement paste
Hydrated surface area
HYDRATION
Incompatibility
Lignosulfonate
Lignosulfonates
MATERIALS SCIENCE
PARTICLES
PLASTICIZERS
PORTLAND CEMENT
Portland cements
SULFONATES
SURFACE AREA
Tricalcium aluminum ferrite
title The effect of calcium lignosulfonate on ettringite formation in cement paste
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