Research Article
Contribution to the Study of the Water Behavior of Starch-Based Composite Films
Doumbia Ahmed*,
Assanvo Edja F.
Issue:
Volume 12, Issue 4, July 2023
Pages:
46-51
Received:
31 July 2023
Accepted:
21 August 2023
Published:
8 September 2023
DOI:
10.11648/j.ijmsa.20231204.11
Downloads:
Views:
Abstract: In our previous studies, we developed a composite based on cassava starch. However, it is observed, like all starchy materials, that it is very hydrophilic and its behavior depends on its water content. This is explained by the attachment of water molecules to the hydroxyl groups of starch via hydrogen bonds. The barrier to water absorption has been reinforced by the incorporation of natural hydraulic lime of the NHL-3.5 type. This study aims to contribute to the knowledge of the water behavior of starch-based composite films. Here, it is the study of the diffusion and absorption of water vapor in a biofilm made of cassava starch reinforced with coconut fibers. To do this, we carried out tests on the sample which made it possible to obtain measurements concerning the hydric behavior of the material. Two approaches were used to evaluate these phenomena under well-defined conditions. The two methods contribute to the same result for the hydric behavior of the composite. The value of the diffusion coefficient obtained is 0.723.10-3 mm2/d. The results obtained are convergent and consistent with those obtained in the literature.
Abstract: In our previous studies, we developed a composite based on cassava starch. However, it is observed, like all starchy materials, that it is very hydrophilic and its behavior depends on its water content. This is explained by the attachment of water molecules to the hydroxyl groups of starch via hydrogen bonds. The barrier to water absorption has bee...
Show More
Geochemical, Geotechnical, Mineralogical and Microstructural Properties of the Cubitermes Sp Termite Mound Soil for Its Use in Construction
Louis Ahouet,
Sylvain Ndinga Okina,
Adolphe Ekouya
Issue:
Volume 12, Issue 4, July 2023
Pages:
52-58
Received:
30 August 2023
Accepted:
15 September 2023
Published:
27 September 2023
Abstract: The geotechnical properties (grain size, Atterberg limits, compressive strength, CBR, linear swelling, static modulus, hydraulic conductivity, SSA, CEC, activity) of the cubitermes sp termite mound soil were determined. X-ray diffraction, scanning electron microscopy coupled with EDS and energy dispersive X-ray spectrometry were used. The results show that the soil is composed of kaolinite, illite, chlorite and intermediate layers of rutile-quartz-hematite. Although the sand content of the soil is less than the minimum of 30% and the compressive strength is CS (3.89 MPa), termite mound soil can be used to make adobe bricks or compressed earth bricks. Termite mound soil is very consistent and impermeable, making it ideal for earthworks. Despite its CBR (33%), the soil contains 7.2% organic matter, well above the 2.5% standard for use as a pavement sub base layer. The soil has an Ac activity (0.603) and a 75% fines content, so lime would be better suited to this soil than cement in the process of improving mechanical properties. X-ray fluorescence analysis shows that the major elements are alumina and silica, which make up the soil's skeleton. The presence of alumina in the soil causes it to swell, which may limit its use in road construction. The presence of Al, Mg and Fe proves the respective existence of aluminum, magnesium and iron oxides in the soil. Titanium present in the soil in oxide form (TiO2).
Abstract: The geotechnical properties (grain size, Atterberg limits, compressive strength, CBR, linear swelling, static modulus, hydraulic conductivity, SSA, CEC, activity) of the cubitermes sp termite mound soil were determined. X-ray diffraction, scanning electron microscopy coupled with EDS and energy dispersive X-ray spectrometry were used. The results s...
Show More
