Green building using nano materials for high performance cement mortar composite
The present paper presents the work of using nano cement mortar to be used in the green building construction was developed resulted to high performance in mechanical properties, such as compressive and flexural strengths, that will minimize the the need for massive quantities of the construction materials that eventually will reduce the carbon footprint due to the reduction in the energy consumption used for the construction material. Different cubes and prisms were cast and tested for determining the compressive and flexural strengths (modulus of rupture) of nano cement mortar. The parameters considered were micro sand, micro cement sulphate resistance conforming ASTM C150 type II, particle size (45–0.7)μm, micro sand (300–75)μm, conforming ASTM C33, nano silica (500–100)μm. Naphthalene sulphonate was used as super-plasticizers. The cement mortar matrices were considered in four groups.
Thermal response of a ferrocement cavity wall under direct fire
AbstractOne of the main challenges for building designs is to provide comfort to its occupants at a low cost. The present investigation aims to study the performance of a ferrocement cavity wall under heating by means of applying direct fire to two ferrocement leaves with a space in between to be filled with insulation material. The main parameters considered in the present investigation are the fire temperature at its core and the space between the two ferrocement leaves. All leaves were subjected to direct fire for 2 hours. The performance of the ferrocement cavity wall was observed by reading an infrared thermometer instrument and examining the crack patterns on the wall panel. It is concluded that increasing the cavity wall space affected the degree of insulation, while the degree of insulation is not affected by the type of insulation material. It is also concluded that hair cracks appeared on the surface of the ferrocement leave facing the fire when the temperature reached 1300°C with the core of th...
Three-dimensional elasticity problems for the prismatic bar
A general solution is given to the three-dimensional linear elastic problem of a prismatic bar subjected to arbitrary tractions on its lateral surfaces, subject only to the restriction that they can be expanded as finite power series in the axial coordinate z. The solution is obtained by repeated differentiation of the tractions with respect to z, establishing a set of sub-problems . A recursive procedure is then developed for generating the solution to from that for . This procedure involves three steps: integration of the stress and displacement fields with respect to z, using an appropriate Papkovich–Neuber (P–N) representation; solution of two-dimensional in-plane and antiplane corrective problems for the tractions in that are independent of z; and expression of these corrective solutions in P–N form. The method is illustrated by an example.