Use of Carbonated Residual Brines as main component of filling grout

R. Delinière (1) , Jean-Emmanuel Aubert (1) , Bernard Husson (1)

1 LMDC - Laboratoire Matériaux et Durabilité des constructions

This study deals with the reuse of an industrial waste rich in CaCO 3 as a mineral addition and agent 9 of stability in low-strength filling grout for soil reinforcement applications. The physical, chemical 10 and mineralogical characteristics of these Carbonated Residual Brines (CRB) were determined and 11 completed by a study of CRB behaviour in cement-based materials and of the optimization of a 12 composition of low-strength filling grouts rich in CRB filling. The results showed that it was 13 possible to use CRB in low-strength filling grout, in replacement of bentonite and fine sand, with 14 better performance-especially in terms of stability. 15 16 Highlights 17 CRB is essentially composed of calcium carbonates (91%). 18 CRB can replace both bentonite and fine sand in low-strength filling grouts. 19 CRB strongly improves the stability of grouts. 20 21

Mots clés: calcium carbonate; grout; flow; stability; filling; bentonite; CO 2 capture

Domaines: Génie civil

R. Delinière, Jean-Emmanuel Aubert, Bernard Husson. Use of Carbonated Residual Brines as main component of filling grout. Construction and Building Materials, 2015, 94, pp.800 - 806. ⟨10.1016/j.conbuildmat.2015.07.096⟩. ⟨hal-01876706⟩