Papers by Mahmoud Roushdi
Sinai Peninsula and Suez Canal Corridor are promising and important economic regions in Egypt due... more Sinai Peninsula and Suez Canal Corridor are promising and important economic regions in Egypt due to the unique location and development opportunities. Thus, the climate change impacts should be assessed over the mentioned area. Accordingly, this paper aims to assess the climate extreme indices in through the last 35 year over Sinai Peninsula and Suez Canal Corridor in addition to predict the climate extreme indices up to 2100. Present and future climate indices were analyzed with using different RCP scenarios 4.5 and 8.5 from 2010 until 2100 for Sinai Peninsula and Suez Canal Corridor. Furthermore, both CanESM and HadGEM2 global circulation models were used. The results indicate that the number of summer days is predicted to increase, on the other hand the frost days is predicted to decrease. Moreover, it is noted a slight positive trend for the percentile of wet and extremely days R95p and R99p for RCP4.5 and negative trend for RCP8.5.
This research presents laboratory studies on the properties of concrete that contains ternary ble... more This research presents laboratory studies on the properties of concrete that contains ternary blends of Portland cement, fly ash, and silica fume. Nine concrete mixtures were prepared with water to cement material ratio of 0.5. The concrete mixtures were designed to have the same degree of workability and percentage of air content. Tests were executed and measurements (i.e. compressive strength, tensile strength, dynamic elastic modulus and static young's modulus) were undertaken. The results indicated that concrete made of such materials (i.e. environmental friends) showed hardened properties since the combination of fly ash and silica fume is somehow synergistic. The research concluded that the replacement of 35% of cement quantity with 25% fly ash and 10% silica fume increased the compressive strength by 20% at 180 days. In addition, the results indicated that the use of ternary natural cement like materials systems in concrete showed a significant resistance to sulphate atta...
International Journal of Recent Technology and Engineering (IJRTE), 2020
Egyptian researchers in the field of climatic changes and their effects on various sectors, such ... more Egyptian researchers in the field of climatic changes and their effects on various sectors, such as agriculture, water resources, health and social usually operate one of the Global Circulation Models (GCMs) and rely on its results. They considered its results as facts and real and they study the impact without reference to the uncertainty in their results. This is a major drawback to study the effect of climate changes on different sectors since there is a persuasive variation in the results of different models. Therefore, the impact analysis may result in building policies and develop alternatives in a way that is related to the real situation of the area under study. It has been found that the best global model or recycling models for the case of Egypt must be neutralized. It is an imperative component for building future policies to study the impact of climate change properly. The current study focuses on assessing the results of GCMs in Egypt. Previous reviews showed that there...
Sinai Peninsula and Suez Canal Corridor are promising and important economic regions in Egypt due... more Sinai Peninsula and Suez Canal Corridor are promising and important economic regions in Egypt due to the unique location and development opportunities. Thus, the climate change impacts should be assessed over the mentioned area. Accordingly, this paper aims to assess the climate extreme indices in through the last 35 year over Sinai Peninsula and Suez Canal Corridor in addition to predict the climate extreme indices up to 2100. Present and future climate indices were analyzed with using different RCP scenarios 4.5 and 8.5 from 2010 until 2100 for Sinai Peninsula and Suez Canal Corridor. Furthermore, both CanESM and HadGEM2 global circulation models were used. The results indicate that the number of summer days is predicted to increase, on the other hand the frost days is predicted to decrease. Moreover, it is noted a slight positive trend for the percentile of wet and extremely days R95p and R99p for RCP4.5 and negative trend for RCP8.5.
Advances in Science, Technology and Engineering Systems Journal, 2020
—Rainfall variability is an important feature of semi-arid climates. Climate change is very likel... more —Rainfall variability is an important feature of semi-arid climates. Climate change is very likely to increase the frequency, magnitude, and variability of extreme weather events such as droughts, floods, and storms. The Blue Nile Basin is facing extreme climate change related events such as floods and droughts and its possible impacts on ecosystem, livelihood, agriculture, livestock and biodiversity are expected. Rainfall variability is a threat to food production in the Blue Nile Basin countries. This study investigates the long-term variations and trends of seasonal and annual precipitation over the Blue Nile Basin for 102-year period (1901-2002). Six statistical trend analysis of precipitation was performed with nonparametric Mann-Kendall test and Sen's slope estimator. On the other hands four statistical absolute homogeneity tests: Standard Normal Homogeneity Test, Buishand Range test, Pettitt test and the Von Neumann ratio test were applied to test the homogeneity of the rainfall data, using XLSTAT software, which results of p-valueless than alpha=0.05, were significant. The percentages of significant trends obtained for each parameter in the different seasons are presented. The study recommends adaptation strategies to be streamlined to relevant policies, enhancing local farmers' adaptive capacity for facing future climate change effects.
Due to the vulnerability of water resources and agriculture sectors to the probable climate chang... more Due to the vulnerability of water resources and agriculture sectors to the probable climate change, this research was initiated with the objective of scrutinizing the climate change impacts on crop water requirements. This was achieved by outlining the behaviour of climate variables during historical periods and examining their expected behaviour in the future. Primarily, literature was reviewed and data was assembled (i.e. meteorological data of 19 meteorological stations). These data were analyzed and were used to conduct a statistical analysis. In addition, the Regional Climate Model RgCM4 was tooled to forecast the meteorological variables in 2050 in order to assess the implications of climate change on crop water requirements. The analysed results demonstrated that there are increasing in temperature and estimated evapotranspiration, while there is a decrease in rainfall variable at most stations. The results indicated an increase in temperature ranging between 0 and 2.7 ºC by ...
Global Nest Journal
Improving the treatment efficiency of a primary wastewater treatment plant (WWTP), in Alexandria,... more Improving the treatment efficiency of a primary wastewater treatment plant (WWTP), in Alexandria, Egypt, was studied. In order to improve the treatment efficiency of the plant, different improving scenarios were proposed and evaluated. The improvement scenarios are: scenario 1, use of engineered wetland instead of the current treatment system, scenario 2, use of the engineered wetland as a secondary treatment after the existing treatment system and scenario 3, replace the existing treatment system with a secondary WWTP. The scope of this study is to environmentally assess the existing primary WWTP, in addition to assess the possibility of using the engineered wetland for improving the primary WWTP. To evaluate the performance of each treatment system, Life Cycle Assessment (LCA) approach was applied. Based on the results, the main improvement achieved in all the scenarios is in the category of eutrophication and acidification, as the three scenarios have higher removal efficiency fo...
Water Science, 2013
This paper investigates the influence of using environmental by-product materials (silica fume an... more This paper investigates the influence of using environmental by-product materials (silica fume and fly ash) in concrete on the chloride ion permeability of concrete. Nine concrete mixtures were designed to have the same degree of workability and air content with water/cementitious material ratio of 0.4. The studied parameters include the main fresh and hardened concrete properties such as slump, air content, unit weight, compressive strength, tensile strength, flexural strength, static Young's modulus, and dynamic elastic modulus. Concrete samples were kept in water for 28 days, then immersed in artificial sea water for 5 months. The total and soluble chloride contents were measured through the concrete using the potentiometric titration analysis. The obtained test results indicated that the use of ternary systems in concrete improved the different characteristics of the product concrete and showed a significant resistance to chloride penetration. The weights of chloride in mix 9 (10% silica fume and 25% fly ash) at depths from the concrete surface to 30 mm were less than the weights of control mix 1 (100% ordinary Portland cement) by about 60%. Further, the ternary systems can be used in concrete industry with considerable proportions.
Desalination, 2011
Wastewater discharged from tannery industries is highly complex, concentrated, and toxic. In view... more Wastewater discharged from tannery industries is highly complex, concentrated, and toxic. In view of the varying nature of discharged wastewater and the numerous small industries in Egypt, there is a need for highly efficient treatment processes that are simple to operate and have low/reasonable construction and operation costs. This study investigated the possibility of applying innovative low cost biological treatment
—Sinai Peninsula and Suez Canal Corridor are promising and important economic regions in Egypt du... more —Sinai Peninsula and Suez Canal Corridor are promising and important economic regions in Egypt due to the unique location and development opportunities. Thus, the climate change impacts should be assessed over the mentioned area. Accordingly, this paper aims to assess the climate extreme indices in through the last 35 year over Sinai Peninsula and Suez Canal Corridor in addition to predict the climate extreme indices up to 2100. Present and future climate indices were analyzed with using different RCP scenarios 4.5 and 8.5 from 2010 until 2100 for Sinai Peninsula and Suez Canal Corridor. Furthermore, both CanESM and HadGEM2 global circulation models were used. The results indicate that the number of summer days is predicted to increase, on the other hand the frost days is predicted to decrease. Moreover, it is noted a slight positive trend for the percentile of wet and extremely days R95p and R99p for RCP4.5 and negative trend for RCP8.5.
—Sinai Peninsula and Suez Canal Corridor are promising and important economic regions in Egypt du... more —Sinai Peninsula and Suez Canal Corridor are promising and important economic regions in Egypt due to the unique location and development opportunities. Thus, the climate change impacts should be assessed over the mentioned area. Accordingly, this paper aims to assess the climate extreme indices in through the last 35 year over Sinai Peninsula and Suez Canal Corridor in addition to predict the climate extreme indices up to 2100. Present and future climate indices were analyzed with using different RCP scenarios 4.5 and 8.5 from 2010 until 2100 for Sinai Peninsula and Suez Canal Corridor. Furthermore, both CanESM and HadGEM2 global circulation models were used. The results indicate that the number of summer days is predicted to increase, on the other hand the frost days is predicted to decrease. Moreover, it is noted a slight positive trend for the percentile of wet and extremely days R95p and R99p for RCP4.5 and negative trend for RCP8.5.
This research presents laboratory studies on the properties of concrete that contains ternary ble... more This research presents laboratory studies on the properties of concrete that contains ternary blends of Portland cement, fly ash, and silica fume. Nine concrete mixtures were prepared with water to cement material ratio of 0.5. The concrete mixtures were designed to have the same degree of workability and percentage of air content. Tests were executed and measurements (i.e. compressive strength, tensile strength, dynamic elastic modulus and static young's modulus) were undertaken. The results indicated that concrete made of such materials (i.e. environmental friends) showed hardened properties since the combination of fly ash and silica fume is somehow synergistic. The research concluded that the replacement of 35% of cement quantity with 25% fly ash and 10% silica fume increased the compressive strength by 20% at 180 days. In addition, the results indicated that the use of ternary natural cement like materials systems in concrete showed a significant resistance to sulphate attack. Moreover; using such materials reduce environmental impacts by reducing the production of cement thus causing the reduction of greenhouse gases emissions, reduction of used energy in cement industry and disposing the natural cement like by-product.
Australian Journal of Basic and Applied Sciences, 2013
This research presents laboratory studies on the properties of concrete that contains ternary ble... more This research presents laboratory studies on the properties of concrete that contains ternary blends of Portland cement, fly ash, and silica fume. Nine concrete mixtures were prepared with water to cement material ratio of 0.5. The concrete mixtures were designed to have the same degree of workability and percentage of air content. Tests were executed and measurements (i.e. compressive strength, tensile strength, dynamic elastic modulus and static young's modulus) were undertaken. The results indicated that concrete made of such materials (i.e. environmental friends) showed hardened properties since the combination of fly ash and silica fume is somehow synergistic. The research concluded that the replacement of 35% of cement quantity with 25% fly ash and 10% silica fume increased the compressive strength by 20% at 180 days. In addition, the results indicated that the use of ternary natural cement like materials systems in concrete showed a significant resistance to sulphate attack. Moreover; using such materials reduce environmental impacts by reducing the production of cement thus causing the reduction of greenhouse gases emissions, reduction of used energy in cement industry and disposing the natural cement like by-product.
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Papers by Mahmoud Roushdi