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Characterization of a lateritic geomaterial and its elaboration through a chemical route

Abstract : The development of a laterite-based geomaterial, mimicking naturally occurring concretions in lateritic soils, through a chemical route has been investigated in this paper. The elaboration process involves an acidic dissolution reaction of iron compounds followed by a neutralization reaction with a strong base. The first step needs a 24 h reacting time before adding the base. Afterwards, the consolidation that involves an iron-bonding of the particles, is performed at 60 °C for 18 days under water-saturated atmosphere. The products elaborated using nitric acid and calcium hydroxide exhibit the best characteristic compressive strength, namely 20 MPa and a good resistance towards water seeping and wearing. Nevertheless, the use of fulvic acid, an organic ecological acid, leads to a water-resistant geomaterial with a good characteristic compressive strength of 12 MPa, thus competitive towards usual stabilized earth and concrete building materials.
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https://hal-unilim.archives-ouvertes.fr/hal-00630554
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Soumis le : lundi 10 octobre 2011 - 13:48:26
Dernière modification le : lundi 22 janvier 2018 - 14:36:01

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Gisèle Laure Lecomte-Nana, E. Lesueur, Jean-Pierre Bonnet, Gilles Lecomte. Characterization of a lateritic geomaterial and its elaboration through a chemical route. Construction and Building Materials, Elsevier, 2009, 23 (2), pp.1126-1132. ⟨10.1016/j.conbuildmat.2008.06.009⟩. ⟨hal-00630554⟩

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