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Density and Strength of Mortar Made with the Mixture of Wood Ash, Crushed Gneiss and River Sand as Fine Aggregate

Journal of Materials Science and Chemical Engineering 2018年第4期6卷 109-120页

作者： Mambou Ngueyep Luc Leroy Keyangue Tchouata Jules Hermann atangana nkene elise rose Ndop Joseph Fotseu Miyo Christian Dupont Ndjaka Jean-Marie Bienvenu Laboratory of Material Sciences Department of Physics Faculty of Sciences University of Yaoundé 1 Yaoundé Cameroon School of Geology and Mining Engineering University of Ngaoundéré Meiganga Cameroon Douala Institute of Technology Douala Cameroon Department of Physics Faculty of Sciences University of Douala Douala Cameroon

The main purpose of this paper is to study the feasibility of using wood bottom ash to partially replace natural fine aggregate or crushed gneiss sand in the manufacturing of mortars. The experiment uses wood ash as fine aggregates, which passes through 5 mm sieve, in proportions of 5%, 10%, 15%, 20% and 25% by weight to replace partially river sand and crushed gneiss, and the both sand of the same size as the aggregate respectively. Experimental results show that density of mortar and the compressive strength of mortar decrease globally with the increase in wood ash content. At 56 days, and for all replacements with wood ash, compressive strengths values of mortar obtained with the mixture of wood ash and river sand is greater than 20 MPa, which is not the case for mortar made with crushed gneiss and wood ash. Moreover, for 5% of replacement with wood ash, compressive strengths of mortar obtained with the mixture of wood ash and river sand and the mixture of wood ash and crushed gneiss are respectively 37 MPa and 32 MPa at 56 days. These values satisfied the strength requirements. Hence, 5% replacement of crushed gneiss with wood ash is suggested and could be benefit for mortar. In addition, the replacement of sand by wood ash is preferable with river sand which contains fewer fines than crushed gneiss. The compressive strength of mortar with 25% wood ash + river sand could be suitable.

关键词： Wood Bottom Ash River Sand Crushed Gneiss Mortar Compressive Strength Density

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Displacements, Strains, and Stresses Investigations in an Inhomogeneous Rotating Hollow Cylinder Made of Functionally Graded Materials under an Axisymmetric Radial Loading

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World Journal of Mechanics 2018年第3期8卷 59-72页

作者： elise rose atangana nkene Luc Leroy Mambou Ngueyep Joseph Ndop Emma Sandring Djiokeng Jean-Marie Bienvenu Ndjaka Department of Physics Faculty of Sciences University of Douala Douala Cameroon Douala Institute of Technology Douala Cameroon Laboratory of Material Sciences Department of Physics Faculty of Sciences University of Yaoundé 1 Yaoundé Cameroon Department of Mine Mineral Processing and Environment School of Geology and Mining Engineering University of Ngaoundéré Meiganga Cameroon

In this paper, an analytical and numerical study of strain fields, stress fields and displacements in a rotating hollow cylinder, whose walls were completely made in Functionally Graded Materials (FGM), was conducted. We have considered the rotating hollow cylinder submitted to an asymmetric radial loading. It is assumed that, because of the functional graduation of the material, the mechanical properties such as Young elastic modulus and the density varies in the radial direction, in accordance with a the power law function. The inhomogeneity parameter was selected between -1 and 1. On the basis of the second law of Newton, Hooke’s law and the strain-stress relationship, we established the differential equation which governs the equilibrium for a rotating hollow cylinder. We found the analytical solution and compared to the numerical solution obtained by using the shooting method and the fourth order Runge-Kutta algorithm. The analytical and numerical results lead to the conclusion that the magnitude of the tangential stresses is greater than that of the radial stresses. The changes due to the graduation of FGM does not produce consistent variations in the distribution of radial stresses, but strongly affects the distribution of tangential stresses. The tangential stresses, tangential strains and displacements are much higher at the inner surface of the cylinder wall. The internal radial pressure intensely affects the radial stresses and the radial strain.

关键词： Functionally Graded Materials Radial Stresses Tangential Stresses Cylinder Wall

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