Observatorio de I+D+i UPM

Memorias de investigación
Ponencias en congresos:
Effects of Nanoclays on SCC Paste Rheology
Año:2019
Áreas de investigación
  • Tecnicas de construccion,
  • Materiales de construccion,
  • Ingeniería de construcción
Datos
Descripción
Self-compacting concrete is an efficient and advantageous technology that increases cast in place speed while reduces energy consumption and health risks. However, some difficulties regarding pumping and lateral pressure on the formwork still limits its widespread use. A promising alternative for reducing the formwork pressure is the use of nanocomponents. Among them, nanoclays such as sepiolite, attapulgite, and montmorillonite can modify the rheological properties of fresh concrete, increasing early age thixotropy and structural build-up. These nanoclays have different morphology and nature, but similar size or BET surface area. In order to evaluate the effect of nanoclays on early rheology of SCC pastes, an experimental study was carried out. A reference paste with ordinary Portland cement blended with limestone filler, 3:1 by weight, was designed and two water-to binder ratios (w/b), 0.35 and 0.45, were considered. Then, four types of nanoclays were incorporated: attapulgite, montmorillonite and two types of sepiolite, one in powder form and the other dispersed in water. Water adsorption was tested using the tea-bag method in tap water and alkaline pore water. Paste consistency was measured by slump flow adjusted using a high range water reducing admixture (HRWRA). The rheological behaviour of the mixtures was tested using the mini-slump flow test. The final spread diameter and time to final spread after mixing were assessed. The aim of this study is to understand and evaluate the effect of nanoclays on the rheological parameters of pastes with cement and limestone filler, which may improve the rheology and the structural build-up at rest, overcoming the problems identified for SCC.
Internacional
Si
Nombre congreso
2nd International RILEM Conference on Rheology and Processing of Construction Materials and 9th International RILEM Symposium on Self-Compacting Concrete
Tipo de participación
960
Lugar del congreso
Dresden, Germany
Revisores
Si
ISBN o ISSN
978-3-030-22565-0
DOI
doi.org/10.1007/978-3-030-22566-7_60
Fecha inicio congreso
08/09/2019
Fecha fin congreso
11/09/2019
Desde la página
517
Hasta la página
524
Título de las actas
RheoCon 2019, SCC 2019: Rheology and Processing of Construction Materials
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Hugo Varela (Universidad de Alcalá)
  • Autor: Gonzalo Barluenga Badiola (Universidad de Alcalá)
  • Autor: Irene Palomar (Universidad de Alcalá)
  • Autor: Alberto Sepulcre Aguilar (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Nuevas Técnicas Arquitectura Ciudad
  • Departamento: Construcciones Arquitectónicas y su Control
S2i 2022 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)