dune sand
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Author(s):  
Stéphanie Bonnet ◽  
Darwish Alzeort ◽  
Philippe Poullain

The museum of the “Bourrine du bois Juquaud” is a tourist site located in the town of Saint Hilaire de Riez in France. It presents the daily life of the inhabitants of the marsh in the early twentieth century and their traditional earthen houses called Bourrine. The Bourrine is a cob construction with reed roof. The earth used for walls is soil from marshlands added with dune sand and straw fibres but some part are without fibres like coating applied on walls. By now, the knowledge acquired on the implementation of these mixtures for the lifting of the walls are oral knowledge and it is necessary to ensure the preservation of this traditional heritage. Currently the done reparations present cracks due to shrinkage. This study aims at well defining the mixtures by a scientific approach. The earth and dune sand were analyzed by taking cores from different existing bourrines and also by extracting soil on site. Different mixtures were produced by varying the proportion of earth sand and water. The linear shrinkage were measured. Corrections were done to get the best mixture for manufacturing and repairing the Bourrines.


2021 ◽  
Vol 45 (6) ◽  
pp. 447-453
Author(s):  
Assia Aidoud ◽  
Messaouda Bencheikh ◽  
Nacera Khaldi ◽  
Ilyess Mouhamed Ahmed Herga

The South of Algeria is known for these immense sand dunes, which cover part of its territory (Sahara). The main objective of this study is the recovery of sands dune and wood waste (sawdust). The latter, which constitutes a potential source of several environmental and economic problems. The objective of this present work is to characterize the physico-mechanical properties at a young age of a dune sand-based mortar lightened by wood waste and to examine the suitability of using it for various applications in the construction of buildings. The improvement of the characteristics of these sands, which essentially formed of sand untapped to date and with the sole aim of enhancing this national sand wealth. The formulation of the mixtures is based on the substitution of dune sand by sawdust, at different weight contents 0, 10, 20 and 30%. The quantity of cement is fixed at 450 g. The results obtained show firstly that the introduction of sawdust improves the characteristics of the mixture (grain size tends to be spread out, reduction in densities), and secondly the physico-mechanical characteristics, especially at 30% substitution (reduction absorption by total immersion of 20.50%, porosity of 28.32%, wet density of 1.73% and dry density of 14.94% and increase in tensile strength of 61.43% and in compression of 63.87%). The effect of sawdust on the relationships between the properties of mortars was clearly noted either for the relationships between early strengths or between compressive and tensile strengths.


Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 41
Author(s):  
Sara Ahmed ◽  
Zin Mahaini ◽  
Farid Abed ◽  
Mohammad Abdul Mannan ◽  
Mufid Al-Samarai

The use of different sustainable materials in the manufacture of ultra-high-performance concrete (UHPC) is becoming increasingly common due to the unabating concerns over climate change and sustainability in the construction sector. Reactive powder concrete (RPC) is an UHPC in which traditional coarse aggregates are replaced by fine aggregates. The main purpose of this research is to produce RPC using dune sand and to study its microstructure and mechanical properties under different curing conditions of water curing and hot air curing. The effects of these factors are studied over a long-term period of 90 days. Quartz sand is completely replaced by a blend of crushed and dune sand, and cement is partially replaced by using binary blends of ground granulated blast furnace slag (GGBS) and fly ash (FA), which are used alongside silica fume (SF) to make a ternary supplementary binder system. Microstructural analysis is conducted using scanning electron microscopy (SEM), and engineering properties like compressive strength and flexural strength are studied to evaluate the performance of dune sand RPC. Overall, the results affirm that the production of UHPC is possible with the use of dune sand. The compressive strength of all mixes exceeded 120 MPa after 12 h only of hot air curing (HAC). The SEM results revealed the dense microstructure of RPC. However, goethite-like structures (corrosion products) were spotted at 90 days for all HAC specimens. Additionally, the use of FA accelerated the formation of such products as compared to GGBS. The effect of these products was insignificant from a mechanical point of view. However, additional research is required to determine their effect on the durability of RPC.


2021 ◽  
Vol 14 (22) ◽  
Author(s):  
Sayhia Benchaa ◽  
Rachid Gheriani ◽  
Abderrahim Achouri ◽  
Hamza Bouguettaia ◽  
Mohammed Laïd Mechri

2021 ◽  
Vol 902 ◽  
pp. 153-159
Author(s):  
Mohsin Usman Qureshi ◽  
Ghassan Alkindi ◽  
Maryam Alsaidi

Dune sands are poorly graded collapsible soils lacking fines. This experimental study explored the possibility of sustainable invigoration of fine waste materials in dune sand to improve the geotechnical properties. The fine wastes used in this study are reservoir sediments and marble waste powder. The fine waste powder was mixed with dune sand at different percentages (5, 10, 25, 50%) to study the gradation, void ratio and, compaction characteristics. A machine has been manufactured to elucidate the maximum void ratio using a developed and manufactured linear-axis 3D clay printer arm. The geotechnical properties of sand-waste mixes delineated in this study reveals the enhancement in compaction and gradation characteristics of dune sand. According to the results, the binary mixture of dune sand with 25% of marble waste and 50% of reservoir sediment gives the highest maximum dry density. Thus, for improving dune sand’s geotechnical characteristics, the addition of fine marble waste and reservoir sediment to the dune sand is an environment-friendly solution.


Author(s):  
V. Sommer ◽  
A. Palm ◽  
A. Schink ◽  
P. Leinweber ◽  
N. Gose ◽  
...  

Abstract Biocrust communities provide a pallet of ecosystem services, such as soil stabilization, altering of hydrological cycles and primary production, and often are the first colonizers of unvegetated surfaces during succession. Therefore, artificially establishing biocrusts can improve soil properties, for example, by stabilizing bare soil surfaces against erosion or by accumulating nutrients. In this study, the establishment of artificial biocrusts was tested for the restoration of potash tailings piles that result from potash fertilizer production and mostly consist of NaCl. A biocrust cover as primary vegetation could decrease the saline seepage waters by trapping rainwaters, thereby reducing the environmental pollution. In a laboratory experiment, we created a salt gradient by mixing the tailings materials with non-saline dune sand. Surface material of the abandoned potash tailings pile Neuhof-Ellers (NE) and material of the Infiltration Hampering Stratum (IHS) were tested, along with a treatment with bone charplus (BCplus) and sodium alginate. A mixture of 50% (w/w) IHS and dune sand was most successful for the establishment of green biocrust microalgae, based on increased biomass and photosynthetic performance. The chlorophyll a content was negatively correlated with the electrical conductivity (EC), and was significantly increased in the BCplus and sodium alginate treatment, while biocrusts failed to establish on pure tailings piles substrates. The limit of the substrates EC for biocrust establishment was 35 mS cm−1. This limit provides a baseline for future studies that should use BCplus and sodium alginate to increase the success of biocrust establishment on potash tailings piles.


Author(s):  
Krzysztof Rychert ◽  
Lisa Wink ◽  
Marcus Blohs ◽  
Christina Kumpitsch ◽  
Charlotte Neumann ◽  
...  
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