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Effect of polycarboxylate superplasticisers on the fresh properties of cementitious materials mixed with seawater
- Source :
- Construction and Building Materials. 289:123143
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- This paper investigated the effect of two types of PCE superplasticisers, including water-reducing and slow-releasing types, on the workability and rheological behaviour of cement mixed with tapwater and seawater. In addition to rheology and minislump tests, the characterisation of PCE on chemical structure and hydrodynamic radius was conducted and the adsorption behaviours were also examined to reveal the underlying mechanisms. The results showed that for the water-reducing type PCE, the seawater led to an obvious decrease in the fluidity of the PCE-superplasticised cement paste whereas it did not significantly change the fluidity of cement with slow-releasing PCE. The addition of both PCEs changed the rheological behaviour of the cementitious materials. Although the mix of seawater decreased the minislump of PCE-superplasticised cement, the adsorption amount of both types of PCE in seawater was increased due to the complexation between the carboxylate group in PCEs and the divalent Mg2+ from the seawater. The reduced dispersion could be attributed to the shrinkage of the PCE backbone and the decreased thickness of the adsorption layer.
- Subjects :
- Cement
Hydrodynamic radius
Chemistry
0211 other engineering and technologies
020101 civil engineering
02 engineering and technology
Building and Construction
0201 civil engineering
Adsorption
Rheology
Chemical engineering
021105 building & construction
General Materials Science
Seawater
Cementitious
Dispersion (chemistry)
Civil and Structural Engineering
Shrinkage
Subjects
Details
- ISSN :
- 09500618
- Volume :
- 289
- Database :
- OpenAIRE
- Journal :
- Construction and Building Materials
- Accession number :
- edsair.doi...........088e9d547f170bd0bea587e37eb7dd48