In many times, a good distribution and implementation of equipment and machines along the quarry faces is considered a challenge to the mining engineer or the quarry operator. Quarry equipment includes drilling machines, air compressors, loading equipment including loaders and/or excavators, in addition to the transportation fleet of high-tonnage trucks. These equipment cost large investments in the production processes and need high skill to be efficiently distributed and operated. In this investigation, study of the optimum distribution of the available drilling machines of different specifications and capacities along the faces of the lime stone quarry of Assiut Cement Company has been carried out. A mathematical model has been used to find several alternatives and to choose the best alternative. Calculation of the minimum number of drilling machines that satisfy the annual production plan is an important step to decrease production costs.

Rubber is used in many industrial applications, specially those need high damping capability. In present work, the effects of cyclic loading conditions on fatigue lifetime of the styrene butadiene (SBR) and nitrile-butadiene rubber (NBR) with 0,20,30,50 and 70 Phr of carbon black contents were investigated. Two cyclic loading conditions, namely full relaxation and non-relaxation tension, were considered. It was found that, in full relaxation tension test, i.e. R=0, fatigue lifetime increased with the decrease of the maximum strain. The decrease of maximum strain was accompanied with decrease in the maximum stress and stress amplitude. It was also found that, in non-relaxation tension test i.e. R>0, fatigue lifetime increased with the increase of the minimum strain, as well as, with the decrease of the stress amplitude. In this case, fatigue lifetime increased in spite of the fact that the increase of the minimum strain was accompanied with increase in the maximum stress at constant maximum strain. Consequently, it was found that the increase of minimum strain was beneficial in increasing the lifetime. It was also found that fatigue lifetime of rubber could be improved by increasing the carbon black content at the test conditions used in experiments.

This paper studies the apparent ground resistivity in two-horizontal layer ground and in two-vertical layer ground through the site measurements obtained. Wenner method was used to measure apparent ground resistance in different grounds. A numerical model was proposed to model the four electrode buried in ground. The apparent ground resistivity had been studied for different conditions which are two-horizontal and -vertical layer grounds. Field measurements had been done in various sites close to water channel and also far away from any apparent vertical layer ground. Generally, the calculated results agreed with the measured results. Analytical calculations had been proposed to distinguish between two-horizontal and two-vertical layer ground.

Fayoumi Standard Weirs have been modified by adding one, two or three pipes, to convey much water to downstream direction. Measurements of discharge with these structures are complicated due to existence of the openings. In this research, an experimental study is carried out to investigate the effect of installing pipes through a piped clear over fall weir and bottom-pipes. Twelve weir models with different heights are tested in horizontal laboratory flume of 17 m length, 0.3 m width, and 0.5 m depth. Weir height is changed two times. Contraction of weirs is changed two times. For each one, the diameter of opening is changed three times. The downstream depth is changed to cover all the concerned flow regimes of flow rate for a submerged pipe and a free weir. The downstream water depth begins with the upper tangent of the pipe and ends with the crest level of the weir. The contraction and the un-contraction of the weir are discussed. The effect of downstream water depth is taken into consideration. The results of flow over weir with opening are compared with those of weir without opening having the same dimensions. It is found that there is a large difference between them. Multiple regression equations based on energy principal and dimensional analysis theory are developed for computing discharge over clear over fall weir with bottom pipes. Also, values of discharge coefficients were estimated for combined flow over the weir and through the pipe. Then the total discharge can be computed by multiplying the discharge coefficient by the summation of theoretical weir discharge plus theoretical orifice discharge. Equations for computing the discharge of combination are awarded

The aim of this work is to improve the fresh and hardened concrete properties made from recycled concrete aggregate, by using a non-traditional admixture.As the previous researches concluded, using different ratios of recycled concrete aggregate has a harmful effect on the properties of fresh and hardened concrete. Otherwise, itpresents a cheap, environmental and sustainable concrete by using the waste materials of demolitions to replace the natural aggregate in concrete mixes. Therefore, organic non-traditional admixture is used in this study to improve fresh and hardened concrete properties.The admixture was prepared using a cheap local material mainly from wastes of vegetable oil industries.Six different types of admixtures were prepared to select the best and most homogenous one.The suggested admixture gives best workability and increase thecompressive strengthof concrete mixescontaining recycled concrete aggregate.

The aim of this work is to improve the fresh and hardened concrete properties made from recycled concrete aggregate, by using a non-traditional admixture.As the previous researches concluded, using different ratios of recycled concrete aggregate has a harmful effect on the properties of fresh and hardened concrete. Otherwise, itpresents a cheap, environmental and sustainable concrete by using the waste materials of demolitions to replace the natural aggregate in concrete mixes. Therefore, organic non-traditional admixture is used in this study to improve fresh and hardened concrete properties.The admixture was prepared using a cheap local material mainly from wastes of vegetable oil industries.Six different types of admixtures were prepared to select the best and most homogenous one.The suggested admixture gives best workability and increase thecompressive strengthof concrete mixescontaining recycled concrete aggregate.

The aim of this work is to improve the fresh and hardened concrete properties made from recycled concrete aggregate, by using a non-traditional admixture.As the previous researches concluded, using different ratios of recycled concrete aggregate has a harmful effect on the properties of fresh and hardened concrete. Otherwise, itpresents a cheap, environmental and sustainable concrete by using the waste materials of demolitions to replace the natural aggregate in concrete mixes. Therefore, organic non-traditional admixture is used in this study to improve fresh and hardened concrete properties.The admixture was prepared using a cheap local material mainly from wastes of vegetable oil industries.Six different types of admixtures were prepared to select the best and most homogenous one.The suggested admixture gives best workability and increase thecompressive strengthof concrete mixescontaining recycled concrete aggregate.

The important requirements for civil engineer are economic and technical in the field and this appears in fill work. The civil engineer needs a suitable soil for fill works, so the expansive soil is studied as one of the possible solution. For this research the physical, mechanical and field tests are performed. The purpose of the present paper is examining the distribution of lateral swelling pressure developed in clay soils on retaining walls after adding water and to predict the values and shape of pressures distribution for design purposes. So, five cells of strain gauges were prepared, the distance between them equals 50cm. and they were fixed at wooden sheet on bedroom's wall in one of Assiut el gadida city projects. Prediction of lateral earth pressures has been a problem to civil engineers for a long time. The first rational approach by which lateral earth pressures could be estimated was simple and practical, and they have come to be known as the classical methods of prediction of lateral earth pressure. The behaviour of soil is swelling after adding water then affects on retaining structures. The effect of soil is depending on many factors like water content, depth, the type and quantity of mineral in soil composition, the time, … etc. The results of this research give a good knowledge about the value and the distribution of lateral swelling pressure, and the results showed that the swelling pressure on retaining structure increases by increasing the water content and montmorillonite minerals content in soil. Then, the results enable the civil engineers to attain safe and suitable design for retaining structure without engineering problems...

The important requirements for civil engineer are economic and technical in the field and this appears in fill work. The civil engineer needs a suitable soil for fill works, so the expansive soil is studied as one of the possible solution. For this research the physical, mechanical and field tests are performed. The purpose of the present paper is examining the distribution of lateral swelling pressure developed in clay soils on retaining walls after adding water and to predict the values and shape of pressures distribution for design purposes. So, five cells of strain gauges were prepared, the distance between them equals 50cm. and they were fixed at wooden sheet on bedroom's wall in one of Assiut el gadida city projects. Prediction of lateral earth pressures has been a problem to civil engineers for a long time. The first rational approach by which lateral earth pressures could be estimated was simple and practical, and they have come to be known as the classical methods of prediction of lateral earth pressure. The behaviour of soil is swelling after adding water then affects on retaining structures. The effect of soil is depending on many factors like water content, depth, the type and quantity of mineral in soil composition, the time, … etc. The results of this research give a good knowledge about the value and the distribution of lateral swelling pressure, and the results showed that the swelling pressure on retaining structure increases by increasing the water content and montmorillonite minerals content in soil. Then, the results enable the civil engineers to attain safe and suitable design for retaining structure without engineering problems...

In Egypt, large quantities of coarse solid wastes are generated during the processing of phosphate ores and quarrying operations of marble and granite rocks. These solid wastes are stored in piles around or near mine sites, which cause many environmental problems. Various solutions have been sought for this major environmental problem and the best solution found is recycling. However these wastes, because of their similarity to the natural aggregate, represent a potentially useful source of material for a variety of applications. The main purpose of this research is to investigate the possibility of utilizing over screen reject generated during phosphate ore processing and rock fragments of quarrying marble and granite rocks in concrete production as full replacement of natural gravel in concrete mix. A number of tests were carried out on these wastes to determine there physical, mechanical and chemical properties, according to the ECP 203 of natural aggregate. So, concrete mixes using the above mentioned wastes as coarse aggregate were done, and then tests for fresh and hardened concrete were carried out. The mean value of uniaxial compressive strength of standard concrete cubes after 28 days of curing was found to be in order of 193 Kg/cm2 for phosphate waste, 262 kg/cm2 for marble waste, and 272 kg/cm2 for granite waste, which approach the conventional concrete used in building. The obtained results proved that these kinds of wastes can be used for concrete mix in civil construction. Admixtures may be used to improve the strength of the first one. The positive uses of these wastes are considered beneficial from the economic and environmental points of view.