scholarly journals Mortar Based on Dune Sand and Substitute Wood Sawdust: Physico-Mechanical Characterization and Relationship Between Properties in Young Age

2021 ◽  
Vol 45 (6) ◽  
pp. 447-453
Author(s):  
Assia Aidoud ◽  
Messaouda Bencheikh ◽  
Nacera Khaldi ◽  
Ilyess Mouhamed Ahmed Herga
Keyword(s):  
Mechanical Characteristics ◽  
Mechanical Characterization ◽  
Sand Dunes ◽  
Young Age ◽  
Wood Waste ◽  
Dry Density ◽  
Dune Sand ◽  
Economic Problems ◽  
Wood Sawdust ◽  
Potential Source

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.

Stabilized Dune Sand for Road Foundation Layers - Case of the Dune Sand of the Region of Djelfa (Algeria)

2013 ◽  
Vol 319 ◽  
pp. 263-277 ◽  
Author(s):  
Ghrieb Abderrahmane ◽  
Mitiche Kettab Ratiba
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Dry Density ◽  
Dune Sand ◽  
Maximum Dry Density ◽  
Local Material ◽  
Hydraulic Binder ◽  
Current Standards ◽  
Made In ◽  
Physical And Mechanical Characteristics

The aim of the work presented in this paper is the valorisation of dune sand, which is abundant in Djelfa (Algeria). This study consists of valorizing a local material in road foundation layers. Several stages will be considered in this investigation. A method of formulation of the mixtures has been proposed, which is based on the stabilization of the studied dune sand using a hydraulic binder and a granular corrector. For each mixture, the optimum Proctor, the compressive strength with and without immersion and the tensile strength have been determined. After that an analysis of the results was made in order to examine the influence of the stabilizing agent proportioning on the physical and mechanical characteristics of mixtures. A correlation between mechanical properties of the stabilized dune sand and the maximum dry density were proposed. The stabilized sand was classified according to current standards, the optimal formulation is then selected, on which additional tests were carried out. The results obtained show that the formulation selected has sufficient performances to be used in road foundation layers.

Test Investigation on Mechanical of Unsaturated Loess

2012 ◽  
Vol 204-208 ◽  
pp. 22-27
Author(s):  
Yan Zhu ◽  
Yun Xu Chen
Keyword(s):  
Water Content ◽  
Horizontal Plane ◽  
Mechanical Characteristics ◽  
Loess Soil ◽  
Dry Density ◽  
One Dimensional ◽  
Test Investigation ◽  
Unsaturated Loess ◽  
Test Result ◽  
Compacted Loess

Compression and collapse of unsaturated compacted loess are studied by using dry density and water content which easily controlled in engineering, the controlling range of dry density and water content are confirmed respectively. Then the deformation of compression and collapse and the frequency of engineering damager occurrence can be decreased. In addition, the mechanical characteristics of loess in different directions may differ because the loess was consolidated only under the condition of its upper weight of soil and load. The conventional mechanical experiments, including one-dimensional compress and collapse test, were conducted with the specimen of loess soil in different angle from the original horizontal plane. The test result shows that the loess is anisotropic

Characterization of Medium Density Particleborads Using Agricultural Residues

2015 ◽  
Vol 1088 ◽  
pp. 656-659
Author(s):  
Ivaldo D. Valarelli ◽  
Rosane A.G. Battistelle ◽  
Barbara Stolte Bezerra ◽  
Luiz A. Melgaço N. Branco ◽  
Eduardo Chahud ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Castor Oil ◽  
Mechanical Characteristics ◽  
Mechanical Characterization ◽  
Raw Materials ◽  
Construction Materials ◽  
Agricultural Residues ◽  
Medium Density ◽  
Polyurethane Resin

In recent years the production of products derived from wood and bamboo are increasing, due to the search for a more rational exploitation of these raw materials. Amongst these products, the particleboards production combine sustainability and rationality in the use of these materials. In this context, this work has the objective to study the application of alternative raw materials in the manufacture of Medium Density Particleboards (MDP), using residues from industrial processimg of coffee and bamboo. MDP had been produced with particles of giganteus bamboo of the Dendrocalamus species and particle of coffee rind in the intermediate layer of the particleboard, bonded with polyurethane resin based on castor oil. The physical and mechanical characterization was carried out accordingly to NBR 14810-3 (2006). The physical properties evaluated were: of water absorption for 2h and 24h; thickness swallowing for 2h and 24h; density, humidity content. The mechanical properties evaluated were: Tensile strength, static bending (MOR and MOE). The results were compared with NBR 14810-2 (2006) and also with the ANSI A208-1 (1993). The physical performance of these particleboards was below the values recommend by the Brazilian norm. Also the mechanical characteristics are not improve, demonstrating that the inclusion of coffee rind did not benefit the physical characteristics and nor the mechanical ones. However it can be used as construction materials for partitions and ceiling panels.

Late Pleistocene Eolian Sediments Related to Pyroclastic Eruptions of Mauna Kea Volcano, Hawaii

1997 ◽  
Vol 47 (3) ◽  
pp. 261-276 ◽  
Author(s):  
Stephen C. Porter
Keyword(s):  
Late Pleistocene ◽  
Sand Dunes ◽  
Primary Source ◽  
Cinder Cone ◽  
Lava Flows ◽  
Trade Wind ◽  
Stratigraphic Correlation ◽  
Dune Sand ◽  
Dune Sands ◽  
Eolian Sediments

Loess and dune sands that mantle volcanic rocks on the northwest flank of Mauna Kea volcano consist predominantly of fine-grained pyroclasts of the alkalic Laupahoehoe Volcanics produced by explosive eruptions. The loess is divided into lower and upper units, separated by a well-developed paleosol, while older and younger dune sands are separated by loess. Four interstratified tephra marker horizons aid in regional stratigraphic correlation. Radiocarbon ages of charcoal fragments within the loess, U-series ages of rhizoliths in the dune sand, and K/Ar ages and relative stratigraphic positions of lava flows provide a stratigraphic and temporal framework. The lower loess overlies lava flows less than 103,000 ± 10,000 K/Ar yr old, and14C dates from the paleosol developed at its top average ca. 48,000 yr. Loess separating the dune sand units ranges from ca. 38,000 to 25,00014C yr old; the youngest ages from the upper loess are 17,000–18,00014C yr B.P. Dips of sand-dune foreset strata, isopachs on the upper loess, and reconstructed isopachs representing cumulative thickness of tephra associated with late-Pleistocene pyroclastic eruptions suggest that vents upslope (upwind) from the sand dunes were the primary source of the eolian sediments. Average paleowind directions during the eruptive interval (ca. 50,000–15,000 yr B.P.), inferred from cinder-cone asymmetry, distribution of tephra units, orientation of dune foreset strata, and the regional pattern of loess isopachs, suggest that Mauna Kea has remained within the trade-wind belt since before the last glaciation.

Growth Kinetics and Mechanical Characterization of a Hard Boron Coating on a Tool Steel

2017 ◽  
Vol 380 ◽  
pp. 29-34 ◽  
Author(s):  
D. Sánchez Huerta ◽  
N. López Perrusquia ◽  
I. Hilerio Cruz ◽  
M.A. Doñu Ruiz ◽  
E.D. García Bustos ◽  
...  
Keyword(s):  
Activation Energy ◽  
Mechanical Characteristics ◽  
Mechanical Characterization ◽  
Chemical Elements ◽  
Thermochemical Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optimal Classification

The mechanical characteristics are determined to a FeB/Fe2B coating applied in AISI L6 steel tool and blades make to cut paper. The thermochemical treatment was applied at temperatures of 1173, 1223 and 1273 K with permanence time of 0.5, 2 and 3 h for each temperature. The diffusion coefficient and activation energy for each phase is obtained for this boron coating on an AISI L6 steel. HRC test were made to establish the type of adherence (qualitative) and comparing with the VDI 3198 standard and the results were obtaining optimal classification of HF1-HF2 in condition for 3h of the three temperatures. The result by nanoidentation show hardness of 1000 - 2000 HV as well as the Young's modulus for each present phase of the coating. Through micrographs (SEM) are showing thicknesses up to 79.52 ± 18.82 μm for FeB and 97.80 ± 20.01μm for Fe2B, a morphology sawn ́s type is evidence. Through EDS and x-ray diffraction are used to show the chemical elements formed.

Pollen Diagram from the Nebraska Sandhills and the Age of the Dunes

1985 ◽  
Vol 24 (1) ◽  
pp. 115-120 ◽  
Author(s):  
H. E. Wright ◽  
J. C. Almendinger ◽  
J. Grüger
Keyword(s):  
Sand Dunes ◽  
Dune Sand ◽  
Last Glacial Period ◽  
Pollen Diagram ◽  
Radiocarbon Dates ◽  
The Holocene ◽  
Swan Lake ◽  
Nebraska Sandhills ◽  
Prairie Vegetation ◽  
The Last Glacial

Radiocarbon dates of organic alluvium beneath as much as 40 m of dune sand along the Dismal River have led to the suggestion that the Nebraska Sandhills date from the Holocene rather than the last glacial period. On the other hand, the basal layers of lake and marsh deposits in interdune depressions at three localities date in the range of 9000 to 12,000 yr B.P., implying a pre-Holocene age for the sand dunes. A pollen diagram for one of these sites, Swan Lake, indicates prairie vegetation throughout the last 9000 yr, with no suggestion that the landscape was barren enough to permit the shaping of the massive dunes characterizing the area. Sand was not transported across the site during the Holocene, either during the marsh phase, which lasted until 3700 yr B.P., or during the subsequent lake phase. The sand that buries the alluvium along the Dismal River may represent only local eolian activity, or it may indicate that the younger of the two main dune series identified by H. T. U. Smith (1965, Journal of Geology 73, 557–578) is Holocene in age, and the older one Late Wisconsin in age.

MDP Panels Manufactured with Hevea Brasiliensis Overlaid with Bamboo Foil of Phyllostachys Edulis

2015 ◽  
Vol 1088 ◽  
pp. 686-689
Author(s):  
Sarah David Muzel ◽  
Maristela Gava ◽  
Juliana Cortez-Barbosa ◽  
Karina Aparecida de Oliveira ◽  
Elen Aparecida Martines Morales ◽  
...  
Keyword(s):  
Hevea Brasiliensis ◽  
Mechanical Characteristics ◽  
Mechanical Characterization ◽  
Urea Formaldehyde ◽  
Rubber Tree ◽  
Homogeneous Layer ◽  
Formaldehyde Resin ◽  
Phyllostachys Edulis ◽  
Structural Reinforcement ◽  
European Standards

The objective of the present work was to study the use of bamboo foils as structural reinforcement for MDP wooden panels. Four wooden panels of homogeneous layer were produced using particles of GT1 and RRIM 600 clones ofHevea brasiliensis(rubber tree), and glued with urea-formaldehyde resin (UF). These panels were also overlaid with foils ofPhyllostachys edulis(mossô bamboo). The tests were realized to evaluate the physical-mechanical characterization according to European standards (EN). The production of the particleboards with reinforcement of bamboo improves the physical-mechanical characteristics of these commercial wooden panels.

scholarly journals Wood Waste Management: Sawdust as a Planting Media during the COVID-19 Pandemic at Sindangmekar Village, Dukupuntang Subdistrict, Cirebon District

2021 ◽  
Vol 5 (2) ◽  
pp. 256-260
Author(s):  
Arie Arie ◽  
Lili Amalia ◽  
Rosalia Rahayu
Keyword(s):  
Waste Management ◽  
Community Service ◽  
Test Scores ◽  
Fundamental Problem ◽  
Economic Value ◽  
Wood Waste ◽  
Wood Sawdust ◽  
Surrounding Environment ◽  
Post Test ◽  
Knowledge Levels

One of the growing industries in Indonesia is the woodworking industry. Wood waste is waste or parts of the wood that no longer has economic value but may still be used at different processes and times. The woodworking industry produces wood waste in 22% wood scraps, 8% wood chips, and 10% sawdust. The fundamental problem in the woodworking industry at Sindangmekar Village was the lack of understanding and practice in wood waste management. Through the socialization of wood waste management as planting media, community service aims to increase knowledge regarding wood waste management. In addition, it can improve practice to manage sawdust as a planting media. Furthermore, it has economic value and becomes one of the solutions to financial problems during the COVID-19 pandemic. The socialization presented materials related to wood waste management and practiced making planting media from sawdust. Thirty participants attended this activity. There was a significant increase in pre-and post-test scores after socialization. In conclusion, socialization regarding wood waste management increases knowledge levels in wood artisans and youth alliance at Sindangmekar Village. In addition, participants can manage wood sawdust as a planting medium. As a result, it can increase the selling value of wood waste, and the surrounding environment becomes clean and healthy.

scholarly journals PERSENTASE LIMBAH PADA INDUSTRI SAWMILL PT. BERAU KARYA INDAH DI KABUPATEN TELUK BINTUNI

2020 ◽  
Vol 6 (1) ◽  
pp. 37-46
Author(s):  
YAYA ◽  
RUSDI ANGRIANTO ◽  
YOHANES Y. RAHAWARIN
Keyword(s):  
Community Engagement ◽  
Wood Waste ◽  
Wood Processing ◽  
Wood Sawdust ◽  
Sawmill Industry

The goal of this study was to understand the types of wood waste and its percentage emanating from sawmill industry. The study situated in sawmill industry of PT. Berau Karya Indah, district of Teluk Bintuni. Data were performed in tabulation and exhibited in tables and images. The results indicated that wood waste obtained from wood processing was about 49.73% that consisted of wood sawdust around 20.69%, slash waste was about 29.03%. In detail, presentation of each detailed unit machine was elaborated such as breakdown saw produced about 4.20 %, ponny produced wood sawdust approximately 11.50 %, resaw indicated sawdust roughly 27 %, while from crosscut, the process produced sawdust approximately 7.02%. Another reuse wood waste was noticed for packing from the slash waste, but the overall wood waste has not been used proportionally due to lack of community engagement.

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