Abstract
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 pum** 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.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Barluenga G, Giménez M, RodrÃguez A, Rio O (2017) Quality control parameters for on-site evaluation of pumped self-compacting concrete. Constr Build Mater 154:1112–1120
Lomboy GR, Wang X, Wang K (2014) Rheological behavior and formwork pressure of SCC, SFSCC, and NC mixtures. Cem Concr Compos 54:110–116
Tregger NA, Margaret EP, Shah SP (2010) Influence of clays on the rheology of cement pastes. Cem Concr Res 40(3):384–391
Quanji Z, Lomboy GR, Wang K (2014) Influence of nano-sized highly purified magnesium alumino silicate clay on thixotropic behavior of fresh cement pastes. Constr Build Mater 69:295–300
Qian Ye, De Schutter Geert (2018) Enhancing thixotropy of fresh cement pastes with nanoclay in presence of polycarboxylate ether superplasticizer (PCE). Cem Concr Res 111:15–22
Tan H, Qi C, Ma B, Li X, Jian S (2015) Effect of polycarboxylate superplasticiser adsorption on fluidity of cement–clay system. Mater Res Innov 19(5):S5-423–S5-428
Ng S, Plank J (2012) Interaction mechanisms between Na-montmorillonite clay and MPEG-based polycarboxylate superplasticizers. Cem Concr Res 42:847–854
Lei L, Plank J (2014) A study on the impact of different clay minerals on the dispersing force of conventional and modified vinyl ether based polycarboxylate superplasticizers. Cem Concr Res 60:1–10
Murray HH (2007) Structure and composition of the clay minerals and their physical and chemical properties. In: applied clay mineralogy occurrences, processing and application of kaolins, bentonites, palygorskite-sepiolite, and common clays, 1st edn, Elsevier, ‎Amsterdam, pp 7–31
Mechtcherine V, Secrieru E, Schröfl C (2015) Effect of superabsorbent polymers (SAPs) on rheological properties of fresh cement-based mortars – Development of yield stress and plastic viscosity over time. Cem Concr Res 67:52–65
Roussel N, Coussot P (2005) Fifty-cent rheometer for yield stress measurements: from slump to spreading flow. J Rheol 49:705–718
Tregger N, Ferrara L, Shah SP (2008) Identifying viscosity of cement paste from mini-slump-flow test. ACI Mater J 105(6):558–566
Ferron R, Gregori A, Sun Z, Shah SP (2007) Rheological method to evaluate structural build-up in self- consolidating concrete cement paste. ACI Mater J 104(3):242–250
Acknowledgement
Financial support was provided by NanoCompaC (BIA2016-77911-R), funded by the Spanish Ministry of Economy and Competitiveness. The authors greatly acknowledge the support of the companies TOLSA GROUP S.A, BASF construction chemicals, Omya Clariana and Cementos Portland Valderrivas.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 RILEM
About this paper
Cite this paper
Varela, H., Barluenga, G., Palomar, I., Sepulcre, A. (2020). Effects of Nanoclays on SCC Paste Rheology. In: Mechtcherine, V., Khayat, K., Secrieru, E. (eds) Rheology and Processing of Construction Materials. RheoCon SCC 2019 2019. RILEM Bookseries, vol 23. Springer, Cham. https://doi.org/10.1007/978-3-030-22566-7_60
Download citation
DOI: https://doi.org/10.1007/978-3-030-22566-7_60
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-22565-0
Online ISBN: 978-3-030-22566-7
eBook Packages: EngineeringEngineering (R0)