Polycarboxylate superplasticiser admixtures: effect on hydration, microstructure and rheological behaviour in cement pastes
| العنوان: | Polycarboxylate superplasticiser admixtures: effect on hydration, microstructure and rheological behaviour in cement pastes |
|---|---|
| المؤلفون: | Marta Palacios, S. Martínez-Ramírez, H. Santos, Francisca Puertas |
| المصدر: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| بيانات النشر: | Thomas Telford Ltd., 2005. |
| سنة النشر: | 2005 |
| مصطلحات موضوعية: | Cement, Materials science, Polycarboxylate superplasticiser, Diffusion, Superplasticizer, Building and Construction, Microstructure, Silicate, law.invention, Portland cement, chemistry.chemical_compound, Rheology, chemistry, law, General Materials Science, Composite material, effect on hydration, Porosity |
| الوصف: | A study was conducted on the effect of a polycarboxylate (PC) admixture on the mechanical, mineralogical, microstructural and rheological behaviour of Portland cement pastes. It was observed that the presence of PC admixture retards the initial cement hydration reactions, although this effect may be offset by possible increased diffusion in later stages. Additionally, the PC admixtures produce a few alterations in the structure and composition of the formed C–S–H gel. The addition of 1% PC admixture in the pastes generates a higher percentage of silicate bridge (Si Q2 units) mainly at 2 days. The admixture used in this study induced microstructural modifications in the pastes which slightly reduced the porosity; however the admixture did not affect the mechanical strength of the pastes at either 2 or 28 days of hydration. Finally, from the results of the rheological studies it was concluded that a low dosage of PC led to a substantial reduction (over 70%) in the yield stress. |
| تدمد: | 1751-7605 0951-7197 |
| DOI: | 10.1680/adcr.2005.17.2.77 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93d4e7d6ec96b6ef3eb9f916123444d1 https://doi.org/10.1680/adcr.2005.17.2.77 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....93d4e7d6ec96b6ef3eb9f916123444d1 |
| قاعدة البيانات: | OpenAIRE |
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