This paper presents an experimental study of the influence of the addition of palm nut fiber on the mechanical strength of cement mortar. Cement mortar specimens reinforced with naturals palm nut fibers have been developed containing between 0 and 3.5% volume fraction fibers. Compression test and flexural test (3-point bending test) are performed on the different samples. It is found from the flexural test that the flexural strength of the mortar reinforced with palm nuts increases slightly regardless of the maturation time of the sample. Conversely, compression tests show a gradual decrease in mechanical strength with the addition of fibers.
The present work deals with a comparative study of the physical-mechanical characteristics of different types of cement CEM II 42.5R produced and used in Cameroon. Indeed, the recent policy of integration and promotion of products in the sub-region has allowed some manufacturers (04) to settle in Cameroon and propose their products that characteristics are most often ignored by consumers. In order to handle this work correctly, we have conducted several tests on cements CEM II 42.5R of CIMENCAM and DANGOTE. These trials were carried out on fresh concrete, mortar, and also on a normalized cement paste. The present study mainly shows the specificities and the characteristics of CEM II 42.5R cement from other brands.
Composite materials based on natural fibers are increasing in demand in various sectors of industry because of their interesting specific properties. This work is a contribution to the valorization, of plant fibers from agricultural plantations in Cameroon, in fiber cement mortar (FCM). This paper studies the influence of the addition of oil palm mesocarp fiber (OPMF) on the physical (water absorption, density and compactness) and mechanical (compressive strength and flexural strength) properties of cement mortars. The fibers used in this paper are extracted from oil palm mesocarp (palm kernel pulp) by a mechanical and manual process. Cement mortar specimens were then made with different proportions of fibers: 0% (reference mortar), 1%, 2%, 3% and 3.5% fibers. Physical and mechanical tests are then carried out on our specimens. Regardless of the duration of immersion in water, the results show that the water absorption rate increases with a greater amount of fiber in the FCM specimens. On the other hand, an inverse effect is observed on density, which decreases from 2277.5 (samples with 0% fiber) to 942.1 kg/m3 (samples with 3.5% fiber) for apparent density and from 2641.2 to 1945.7 kg/m3 for absolute density. On the mechanical properties, there is a steady decrease in compressive strength from 42.47 (for the reference mortar at 0% fiber) to 31.1 MPa (for the sample at 3.5% fiber). In bending, there is first an increase and then a decrease in strength with the amount of fibers. The maximum flexural strength is obtained for a 2% fiber composition. The FCM has a better strength/density ratio. Finally, the addition of OPMF, in small proportion in the cement mortar, allows a lightening of the structure, but induces a small decrease in mechanical resistance. Our FCM can be used in the manufacture of cinderblocks or as internal wall roughcoating mortar.
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