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...
A New Vacuum Pressure Infiltration CFRP Method and Preparation Experimental Study of Composite
In order to prepare a carbon-fiber-reinforced polymer composite (CFRP) with ideal microstructure and properties, a new vacuum pressure infiltration CFRP method is proposed based on an analysis of existing CFRP preparation process methods. Research on composite material preparation systems was carried out by using this new method principle. The system mainly includes a fiber pre-forming module, a vacuum heating infiltration module, a hot-press curing molding module, and a data acquisition control module. Under the conditions of natural curing at 0 MPa + 6 h + 25 °C, vacuum heating curing at –0.05 MPa + 30 min + 80 °C, and hot-press curing at 0.7 MPa + 5 min + 50 °C, a two-dimensional (2D) CFRP with excellent microstructure and properties was successfully prepared. Observing the microstructure of the prepared composite material, it can be found that the inside of the composite material was sufficiently and uniformly infiltrated, and common preparation defects such as holes and delamination were effectively controlled. Through the performance test, the bending strength of the material reached 790 MPa.