One of the main performances of earth material is the thermal regulation. The aim of this study is centered on the possibility of applying the grunge of the Cameroonian Coast for its suitable valorisation. Thus focusing on the parliamentary law so as to be capable of supplying, first, a material with a reduced polluting impact and secondly one with which the thermal comfort of the building would be amended; all these for the population of the Cameroonian Coast. The identification results assure the possibility of using the earth of the Cameroon coastal region for CEB with a grain size distribution even though the crater spindle contained shows a discontinuous tray type. Again, this study aims at showing the possibility of using this earth material for the manufacturing of porcelain, sanitary ware and tableware. As far as the characteristics are concerned, a convergence of the grading, mineralogical and chemical results show a medium-active kaolinite-type clay and a sandy loamy-clay earth. That's why for in-depth knowledge major elements and minerals have been identified by X-ray fluorescence and X-ray diffraction. The mechanical tests carried out on the clay show a sufficient plasticity in the wet state, even though it is also pointing out possibilities of improving these performances by using adequate stabilizers.

The rise in industrialization and infrastructural development is increasing leading to a constant need for construction materials; however, some of these materials continue to pose a problem to the concerned environments. There is a need to search for materials that will reduce environmental degradation and ensure sustainability. Natural pozzolanic materials possess certain characteristics such that their use in mortar and cement production could reduce the emission of carbon dioxide (CO2) due to the transformation of limestone (CaCO3) into lime for production of Portland cements. Colossal deposits of volcanic pozzolan outcrop in the Njimbouot II locality and the characterization of those materials is vital in deciphering their suitability in cement production as a construction material for sustainable development. Grinding is the only treatment performed on pozzolans in order to increase their specific surface area and reactivity. The rate of substitution of cement with pozzolan in the samples varied from 0%, 10%, and 15% to 25%. Mechanical tests were carried out after 7, 28 and 90 days on mortar specimens (4 × 4 × 16 cm3). Results revealed the presence of amorphous phases. The activity index obtained was approximately 75% and the lapilli and volcanic ash in this area are classified as pozzolans (classification ASTM C618). Regardless of the rate of substitution, the mechanical proprieties of mortars are observed to increase with age. The compressive strength values changed from 33.72 to 52.5 MPa while the flexural strength evolved from 5.62 to 8.29 MPa revealing that the Njimbouot II Pozzolan are advantageous in the manufacture of ecological cements.

The purpose of this study is to determine the morphological, microstructural characteristics and water diffusion parameters of the Canarium schweinfurthii (CS) shellnut. This work is part of a vast project to valorize the above-mentioned cores for possible industrial use as charges in composites or abrasives materials. The study was based on the characterization of intrinsic physical characteristics of the coreshells scanning electron microscopic (SEM) observations desorption, adsorption and absorption kinetics. The water diffusion phenomenon was modeled and it appears that the Page model well predicted the kinetic of drying, absorption and adsorption. The effective diffusion coefficient and the energy of activation were calculated at three isothermal temperatures (50˚C, 70˚C and 90˚C). There was a tendency for hysteresis in the sorption-desorption cycles. These results strongly predicted the possibility of using these products as a filler in composites, clay building materials and cement because of their high water diffusion stability on a macroscopic scale.

This paper describes the physical, mechanical, and hygroscopic behaviour of compressed earth bricks (CEB) reinforced with fibres of Bambusa vulgaris. Three fibre contents (0.5, 0.75, and 1.0 wt.%) and lengths of fibre (4, 5 and 6 cm) were considered as reinforcement for the compressed earth blocks based on cement stabilisation with 8.0% of the weight of the mixture. CEB composites were compacted with a static loading by applying a compacting stress of 15 MPa. Results show that the appropriate addition of Bamboo fibres can improve mechanical properties of CEBs. In particular, the compressive strength increases by 43.6%, at an optimum fibre content of 0.5 wt.% and at a length of 4 cm. The compressive strength also increases of 24.6% and 25.6% for a fibre content of 0.75 wt.% at 4 cm long and for 0.5 wt.% at 5 cm long respectively. The flexural strength also increases with increase in fibre content and length of fibre. The highest value ​​of flexural strength is obtained with CEB containing 1.0 wt.% of fibre content while the lowest value is obtained with blocks without reinforcement. For the water absorption, there is an increase by 18.4, 25.1 and 27.6% when the fibre content increases by 0 to 1.0 wt.% for fibres length of 4, 5 and 6 cm long, respectively. However, as the fibre content and length increase, the density decreases, and the porosity and water absorption increase due to their porous character and hydrophilic.