A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Rheology Evaluation of Cement Paste with Nanoclays, Nanosilica and Polymeric Admixtures for Digital Fabrication
Additive and digital manufacturing have opened wide new opportunities in architectonic design with cement based materials. However, there are still some issues to be addressed regarding rheological properties’ control. Among rheology modifiers, nanoclays, nanosilica and polymeric admixtures can be used to adjust rheological properties of cement paste, as yield stress, viscosity and thixotropy. These rheological properties are a key factor to control technological requirements as pumpability, extrudability and buildability. An experimental study was carried out to evaluate the combined effects of nanoclays, nanosilica and polymeric admixtures on cement paste rheology for digital fabrication, considering their interactions and synergies. A reference paste with ordinary Portland cement blended with limestone filler, 2:1 by cement weight, and a low water to binder ratio was designed. Then, four different nanoclays - attapulgite, bentonite and two types of sepiolite-, a commercial nanosilica, two types of viscosity modifying admixtures (VMA) and a high range water reducing admixture (HRWRA) were added. Flowability of cement pastes was assessed with the minicone slump test and the synergetic effect and interactions between nanoclays, nanosilica and polymeric admixtures were evaluated.
Rheology Evaluation of Cement Paste with Nanoclays, Nanosilica and Polymeric Admixtures for Digital Fabrication
Additive and digital manufacturing have opened wide new opportunities in architectonic design with cement based materials. However, there are still some issues to be addressed regarding rheological properties’ control. Among rheology modifiers, nanoclays, nanosilica and polymeric admixtures can be used to adjust rheological properties of cement paste, as yield stress, viscosity and thixotropy. These rheological properties are a key factor to control technological requirements as pumpability, extrudability and buildability. An experimental study was carried out to evaluate the combined effects of nanoclays, nanosilica and polymeric admixtures on cement paste rheology for digital fabrication, considering their interactions and synergies. A reference paste with ordinary Portland cement blended with limestone filler, 2:1 by cement weight, and a low water to binder ratio was designed. Then, four different nanoclays - attapulgite, bentonite and two types of sepiolite-, a commercial nanosilica, two types of viscosity modifying admixtures (VMA) and a high range water reducing admixture (HRWRA) were added. Flowability of cement pastes was assessed with the minicone slump test and the synergetic effect and interactions between nanoclays, nanosilica and polymeric admixtures were evaluated.
Rheology Evaluation of Cement Paste with Nanoclays, Nanosilica and Polymeric Admixtures for Digital Fabrication
RILEM Bookseries
Bos, Freek P. (editor) / Lucas, Sandra S. (editor) / Wolfs, Rob J.M. (editor) / Salet, Theo A.M. (editor) / Varela, Hugo (author) / Barluenga, Gonzalo (author) / Palomar, Irene (author)
RILEM International Conference on Concrete and Digital Fabrication ; 2020 ; Eindhoven, The Netherlands
Second RILEM International Conference on Concrete and Digital Fabrication ; Chapter: 15 ; 144-152
RILEM Bookseries ; 28
2020-07-08
9 pages
Article/Chapter (Book)
Electronic Resource
English
| British Library Online Contents | 2012