Landrou Gnanli, Brumaud Coralie, Winnefeld Frank, Flatt Robert J, Habert Guillaume
Institute of Construction and Infrastructure Management, Chair of Sustainable Construction, Swiss Federal Institute of Technology (ETH Zurich), Stefano-Franscini-Platz 5, Zürich 8093, Switzerland.
Laboratory for Concrete/Construction Chemistry, Empa, Swiss Federal Laboratories for Material Science and Technology, Überlandstrasse 129, Dübendorf 8600, Switzerland.
Materials (Basel). 2016 Apr 29;9(5):330. doi: 10.3390/ma9050330.
This paper focuses on the modification of clay properties with inorganic additives to deflocculate and flocculate inorganic soil for the development of a material that would be as easy to use as the current concrete products, but with a much lower environmental impact. Considering that the rheological behaviour of clays is controlled by their surface charge, we first introduce potential determining ions to deflocculate the clay particles and to reduce the yield stress of the earth material. Their efficiency is characterized using zeta potential measurements and rheological tests. We then achieve the flocculation of clay particles by using natural minerals that slowly dissolve in the interstitial liquid and ultimately precipitate calcium silicate hydrate (C-S-H). The precipitation products are identified by X-ray diffraction and the consequences of this delayed precipitation are followed by oscillatory rheometric measurements. Finally, it is suggested that in this process, C-S-H precipitation is not used as a binding vector but as an anti-plasticizer that removes the inorganic dispersant additives.
本文着重探讨通过无机添加剂对黏土性能进行改性，以使无机土壤解絮凝和絮凝，从而开发出一种材料，其使用起来能像当前的混凝土产品一样简便，但对环境的影响要小得多。考虑到黏土的流变行为受其表面电荷控制，我们首先引入电位决定离子以使黏土颗粒解絮凝，并降低土材料的屈服应力。通过zeta电位测量和流变测试来表征它们的效率。然后，我们使用天然矿物使黏土颗粒絮凝，这些天然矿物在孔隙液体中缓慢溶解，最终沉淀出水化硅酸钙（C-S-H）。通过X射线衍射鉴定沉淀产物，并通过振荡流变测量追踪这种延迟沉淀的后果。最后，有人提出，在此过程中，C-S-H沉淀不是用作粘结载体，而是用作去除无机分散剂添加剂的抗塑化剂。
