This article introduces and explains the demolition methods used for civil structures. There are two types of techniques for demolition, dismantle and damage. The conventional and non-conventional methods are used in the demolitions of steel, paving and reinforced concrete structures. It is clear that there are many factors and requirements affecting the processes of demolitions. It is concluded that many factors including the environmental protection, disturbance, solid waste generated, space, cost, safety of workers and surroundings, energy required and other factors are very important in selection of the demolition process. It is appear that the nonconventional methods used in concrete construction's demolition are effective, fast, costly and environmental safe. These methods have also many environmental benefits such as reduced air contaminants and noise pollution.

The problem of continuous decline in precipitation in the Arab countries and neighboring countries is one of the most important challenges facing countries and societies in this region. The increasing shortage of rainfall due to climate change in these regions in particular and in most countries in the world in general drives these countries and communities to over-extraction from groundwater, which could result in rapid loss, The concept of water harvesting is intended to try to make the most of rainfall by finding ways to ensure the accumulation of the largest possible rain precipitation and to store it for use in many areas and in some extent to reduce the groundwater ,The aim of this study is to develop some methods in urban treatments through the design of sidewalks and streets within the cities in order to allow the flow of rainwater and work to collect them in containers used later in the irrigation of gardens or in the requirements of fire extinguishing systems or any other urban needs. This case study was done in Al Madina Al Munawwarah Street in Amman, Jordan. The results said that the total amount of water can be collected during the rain seasons in the target area will be about 9146 m 3 /y. This quantity can be used for a fire extinguisher or irrigation of plant or trees in the middle or at both sides of the street. This means that the water harvested over the Jordan area is about 243000000 m 3 .

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Large quantities of refused plastic material were produced due to industrial development. These solid waste having an adverse impact on environment. Moreover, the increase of the plastic refuse which causes severe fear for public led in parallel to search effective and useful manner to find out any other method to sustainable. The paper was conducted to find out any treatment for the problem of the management of plastic municipal solid waste (MSW) in Jordan using as additive in the modification of road aggregate performance. In the same time, this will contribute to reduce the environmental impact of the plastic solid waste. This refused plastic was utilized to improve the asphalt performance. The first sets of experiment were carried out upon a six samples were tested with asphalt percentages of (5, 5.5, 6, 6.5, 7 and 7.5) at 60 o C and the results gave that the optimum asphalt ratio was to be 7%. The second sets of testing were conducted for the optimum amount of refused plastic added to another six sets of samples tested at different percentage of refused plastic as follows (2, 2.5, 3, 3.5, 4 and 4.5 %) at 60 o C and the results gave that the optimum ratio of plastic added was 4%. The results of the comparative study between hot mix asphalt and modified hot mix asphalt show that the addition of plastic has a significant positive effect on the properties of HMA, and mitigating the adverse effect on the environment.

Nanocrystalline metal ferrites (MFe 2 O 4 , M = Co, Ni, Cu, Mg, and Zn) were successfully synthesized via autocombustion synthesis using egg white. X-ray diffraction (XRD) measurements revealed the crystallization of the entire ferrites either in the tetragonal structure, such as in the case of CuFe 2 O 4 , or cubic spinels such as in other studied ferrites. The Fourier transform infrared spectral study revealed the characteristic vibration bands of ferrites. Compared to other synthesis methods, the observed variation in the obtained structural parameters could be due to the different cation distribution of the prepared ferrites. In agreement with XRD measurements, the transmission electron microscopy images showed agglomerated particles with cubic morphology for all ferrites. On the other hand, CuFe 2 O 4 showed tetragonal morphology. The magnetization values were found to vary with the type of the metal ion, and CoFe 2 O 4 showed the highest one (42.8 emu/g). Generally, the lower magnetization values obtained than those reported in the literature for all studied ferrites could be attributed to the smaller particle sizes or the cation redistribution. The obtained coercivity values are observed to be higher than their related values in the literature, exhibiting the impact of the present synthesis route. Ac-conductivity as a function of temperature and frequency indicated semiconducting properties with the observed change in the conduction mechanism by increasing the temperature. The obtained low dielectric constant values could suggest using the entire ferrites in high-frequency applications such as microwave devices.