Study of the Curing Behaviour of an Algerian Calcareous Crust
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ORIGINAL PAPER
Study of the Curing Behaviour of an Algerian Calcareous Crust Hamza Loualbia . Myriam Duc . Abdellah Demdoum
. Sadok Feia
Received: 27 January 2020 / Accepted: 3 September 2020 Springer Nature Switzerland AG 2020
Abstract For some compaction water content, calcareous crust remains a solid, and may readily be collapsing when the saturation increased. After a period that depends on the evaporation of the water, the calcareous crust compacted begins to harden or gain strength. The strength gain is very rapid at quick drying, but it will be slow, for slow drying. Evaporation from the calcareous crust compacted should be related to the increase in strength. This experimental work carried out on samples dried under different conditions, attempts to explain the origin of the curing and the existence of a water content for which it is maximum. SEM observations and mercury intrusion porosimetry (MIP) test have shown that the assumption that suction contributes only to an increase in H. Loualbia Laboratory of Mechanical and Materials Development, Zaine Achour University, Djelfa, Algeria M. Duc IFSTTAR/GERS/SRO, Eastern Paris Federal University, 77447 Marne-la-Valle´e, France A. Demdoum (&) Laboratory of Mathematical and Applied Science, University of Ghardaı¨a, rue 20 AOUT 55, BP 455, 47000 Ghardaı¨a, Algeria e-mail: [email protected] S. Feia Research Laboratory of Civil Engineering (RLCG), Department of Civil Engineering and Hydraulics, Biskra University, Biskra, Algeria
cohesion may not be always true. The dissolution of calcite during the imbibition may also influence the curing. Keywords Calcareous crust Curing process Compaction Water content Strength
1 Introduction Several studies have shown that tuffs (a carbonatebased material) are cohesive materials that require wet compaction (Alloul 1981; Ben Dhia 1983; Morsli 2007; Goual et al. 2012; Demdoum et al. 2016; Demdoum et al. 2017) however this cohesive material varies during curing. Despite the importance of this phenomenon and the interest shown by geotechnicians, there is limited literature on the subject. This lack of study is attributed both to the type of material studied, i.e. a local and fine material, and to the parameter studied for the curing phenomenon. Indeed, the use of fine materials is a necessity in arid climates (which reduces the number of countries facing the tuff problem) and thus the number of studies on the subject. This number is all the more reduced as the ‘‘cohesion’’ criterion as the source of curing is not a selection criterion common to all the countries interested in tuffs. Geotechnicians are considered to be the first to focus on the contribution of cohesion to
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pavement performance in arid environments (Fumet 1959; Peltier 1959). The curing phenomenon was reproduced in the laboratory on calcareous tuffs and/or gypsum sands. Cohesion was assessed by the simple compressive strength after compaction and drying of specimens (similar to c
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