Ce travail s'inscrit dans le développement de matériaux locaux, telle que la fibre végétale (fibre de palmier) et l'argile rouge du sud Algérien, largement utilisées dans la préparation des briques, comme matériaux de construction rurale. Les fibres végétales possèdent des propriétés très intéressantes, elles sont : renouvelables, biodégradables et le rapport coût/légèreté faible. Leurs propriétés mécaniques sont très importantes. Cependant, le problème prédominant dans ce type de matériaux composites est la faible adhésion de l'interface matrice-fibre, attribuée probablement, à la nature de la surface et au caractère hydrophobe des fibres naturelles, conduisant ainsi, à des propriétés mécaniques faibles pour le composite envisagé. Le but de cette étude consiste à traiter la fibre de palmier par une solution basique d'hydroxyde de sodium (NaOH 4 % [m/v]) durant des périodes variables : 3, 7, 24 et 48 heures, afin d'améliorer l'adhésion interfaciale. Les résultats obtenus à partir des essais réalisés sur le composite renforcé par les fibres de palmier traitées durant 7 h ont montré une nette augmentation quant à la résistance, à la flexion et à la compression ; cette croissance est respectivement de l'ordre de 57 et 60 %, comparativement au composite renforcé par les fibres non traitées. On peut déduire que les fibres de palmier peuvent être considérées comme l'un des matériaux appropriés pour le renforcement de l'argile.Mots clés : fibres de palmier / argile rouge / traitement alcalin / composite Abstract. Study of the effect of alkaline palm fiber treatment time on the mechanical behavior of red clay materials from the region of M'sila. This work is part of the development of local materials, such as vegetable fiber (palm fiber) and red clay from southern Algeria, widely used in the preparation of bricks as rural building materials. Vegetal fibers have very interesting properties, they are: renewable, biodegradable and low cost / lightness ratio. Their mechanical properties are very important. However, the predominant problem in this type of composite material is the weak adhesion of the matrix-fiber interface, probably attributed to the nature of the surface and the hydrophobic character of the natural fibers, thus leading to weak mechanical properties for the material, envisaged composite. The purpose of this study is to treat palm fiber with a basic solution of sodium hydroxide (4% w/v NaOH) for varying periods of time: 3, 7, 24 and 48 hours to improve interfacial adhesion. The results obtained from the tests carried out on the composite reinforced with palm fibers treated during 7 hours, showed a clear increase as regards the resistance to bending and compression; it is respectively of the order of 57 and 60%, compared to the composite reinforced by the untreated fibers. It can be deduced that palm fibers can be considered as one of the suitable materials for clay reinforcement.

The aim of the research is spatial modeling to assess urban resilience. A group of Delphi experts were involved, in stages, to select the final criteria. Using Multi-Criteria Decision Analysis (MCDA) by (AHP), the final criteria were ranked according to weight and importance. Criteria maps within a GIS environment were combined with AHP results, to create an Urban Resilience Map (URM). The results showed that (52.19%) of the study area achieved high resilience, (30.86%) medium resilience and (16.95%) low resilience. The results also showed that there are differences between the neighborhoods of the city of Bou-Saâda in terms of resilience that can be determined spatially. The results of this research can be used as a decision aid such as providing suggestions to planners and managers in prioritizing their interventions (such as urban renewal of neighborhoods) by conducting checks on less resilience criteria, in order to support the city's ability to respond to shocks.

The review of the scientific literature has shown that the external spaces of collective condominiums play an essential role in the inhabitant well-being and contribute positively to their moral health. However, in Algeria, these spaces suffer from many hazards, the negative effects of which are more and more palpable both on the urban and social levels. In the absence of development or lack of adaptation to the socio-cultural needs of their users, they appear to be abandoned, given the major misuse of uses promoting unhealthy conditions, insecurity and ill living. Like the Algerian cities, the external spaces of the condominiums of the city of M’sila are not immune to these urban diseases. By choosing three condominiums as a case study, this article attempts to assess the relationship that could exist between the quality of development and management (upkeep and maintenance) with the level of degradation of the exterior spaces of these condominiums, and this, through the survey technique. In a second step, and through the technique of semi-structured interview, the level of user satisfaction will also be assessed. Statistical data processing will be done using Sphinx plus² software (version5).

This article describes a study conducted to determine the ideal both traditional and stabilized composition of adobe as a building material, and to further refine an appropriate choice of coating composition for extended durability of these constructions in adobe: choose the suitable coating that fits the most with its substrate. The constructions in Z’gueg El Hadjadj [Laghouat town, Algeria] consist of adobe walls but also plaster that serves as a coating for these brick walls. The degradation phenomena of the building are considered in the adobe-coated couple, and consequently in the suitability of their compositions. The compatibility of plasters with adobes remains a major factor in the restoration and conservation of earthen constructions. This paper examines the results of the experimental characterization of the behavior of coated bricks, which consists of studying in the laboratory the water resistance: the drying-wetting test and the capillary rise test, as well as the complementary accelerated aging test: the abrasion test. These tests will be supplemented by another test, that of the adhesion, to see the compatibility of the coatings with their supports. The results, compared below, led to the conclusion that for capillary absorption and adhesion tests, a homogeneous coating in 3 layers could give more conclusive results. The drying-wetting test is recommended especially for bulk and surface treated samples.

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