Curious Civil Engineer

 Join from here Join the course   This course designed to expand your practical side of engineering knowledge. This course is concentrating on the construction of roads. Here you will learn how the road constructed. The construction stages such as protection of existing services, clearing the area, future utilities, preparing the road subgrade, then placing different pavement layers such as sub-base, base course, and asphaltic courses. Also, we will discuss the types of asphaltic course and the common defects of asphaltic pavement, such as permanent deformation, fatigue cracking, and low-temperature cracking. Also, I will show a typical cross-section of road and road profiles.  Also, I will explain what the prime coat is, why the prime coat is used, and the proper way of applying, preparing the surface of the pavement layer before applying the prime coat, and the curing time for a prime coat. Tack coat, what is the Tack coat, why the Tack coat used, where the tack coat is...

 concrete workability is a property of concrete determining the ease of mixing, placing and compacting concrete with minimum loss of homogeneity. construction management: concrete construction bridge construction:How to become a bridge engineer Factors affecting workability  W/C: increasing of water-cement ratio will increase concrete workability but it will reduce the strength of the concrete mix. increasing water-cement ration will increase concrete permeability and this will reduce concrete strength and durability. on the other hand, using concrete with little water insufficient to interact with cement particle to cause hydration this will result in strength reduction. W/C usually ranges from 0.35-0.40. size of aggregate: Bigger size of aggregate means lesser surface area. as a result, the amount of water required for wetting the aggregate surface is lesser than the smaller size.and this will result in higher workability for the same water content. the shape of aggrega...

  the grade of strands shall be G270 with a yield strength of 1650 MPA and ultimate strength of 1860 MPA. Strands shall be protected against corrosion. It shall be cold drawn, stress relieved, low relaxation, uncoated, seven wires and high tensile strength. construction management: concrete construction bridge construction:How to become a bridge engineer Properties 1.Tensile strength: strand shall be tested at the laboratory to verify the tensile strength.  2.Modulus of elasticity: the relation between stress and strain remain linear up to 90% of ultimate strength. We can notice this from the figure below. The value for modulus of elasticity for strands is given by AASTO 5.4.2 for strands equal to 197000 MPA, for bars equal 207000 MPA. 

  Design a one-way slab for the inside of a building using the span, loads, and other data given in  Figure 1. Normal-weight aggregate concrete is specified with a density of 145 pcf. (assuming cover 3/4 in) Figure 1 The minimum thickness for one-way slab simply supported=L/20 using table 1(ACI 9.5.2.1) h=10/20=0.5=6in Table 1 construction management: concrete construction bridge construction:How to become a bridge engineer now we will calculate d=(6-3/4(cover)-1/4(estimated as half diameter of reinforcement) d=5 in  now we will calculate dead load concrete density=145pcf, Usually 5 pcf is added to account for the weight of reinforcement, so 150 pcf is used in calculating the weight of a normal-weight concrete member. dd=(6in*ft/12)*1*150/=75 lb/ft LL=200*(1)=200lb/ft Wu=1.2*75+1.6*200=410 lb/ft maximum moment for simply supported span =(Wu*L^2)/8 =(410*10^2)/8=8/=5,125lb-ft=61,500lb-in now we can calculate  ρ     ρ=(0.85*fc'/fy)*(1- √(1-(2*Rn/0.85*fc')) Rn...

  bridge bearing is a critical component, it provides a bridge with flexibility, and it is used to transfer the loads from superstructure to substructure.  construction management: concrete construction bridge construction:How to become a bridge engineer bridge bearing function: Facilitate transfer of vehicular and other environmentally imposed loads from the superstructure to the substructure. Accommodate anticipated movements such as thermal, shrinkage, creep movement. Elastomeric bearings are made of layers of synthetic  chloroprene rubber (CR) or natural rubber (NR). Steel plates are placed between rubber layers, rubber layer will be merged by vulcanization to produce a single pad. The elastomeric bearing will allow for rotation of superstructure. Movement of the superstructure will be accommodated through elastic deformation. Figure 1 Figure 2 Pot bearing consist of a steel pot, the steel pot enclosing an elastomeric disc, the elastomeric disk pressed from the top by...

Click here to enroll   This course will discuss the design of pile foundations. We will learn the methods of calculating the pile bearing capacity. The bearing capacity for a pile consists of skin and end bearing resistance. Here you will understand how to calculate the skin and end bearing resistance. Also, we will discuss the effects of the pile group on pile individual bearing capacity. We will determine the impact of pile group on individual pile bearing capacity and the amount of reduction of pile bearing capacity. Also, we will discuss the safety factor for pile design and the acceptable ranges for the safety factor. The second part of the course will discuss the type of foundations; in general, we have two types of foundation. Shallow and deep foundations. Here we will concentrate on deep foundations. Deep foundations are classified into driven and cast-in-situ piles. Cast-in-situ piles are constructed at filed by the drilling borehole in the existing ground, then filling th...

Rebound hammer is a non-destructive test used to examine the hardened concrete. The principle of the rebound test is based on the rebound of a plunger. The plunger of the rebound hammer is pressed against a concrete surface. The hammer mass will be pushed back and secured to a pin. The impact spring is attached to the hammer mass, so it will be extended with the hammer mass. Then the hammer mass is released.finally, the mass will rebound against the concrete surface, as shown in figure no:1. The surface hardness and compressive strength will be correlated with the rebound of the spring controlled mass.  Figure 1 Figure 2 A rebound hammer can be used to evaluate the compressive strength of a concrete member, quality of concrete, and uniformity of concrete. The approximate impact energy required for the rebound of the hammer for different applications is shown in table no:1. Table 1 The procedure of conducting the rebound test will begin by the calibration of the test instrument. The...

  Click here to join This course is designed to expand your knowledge. in this course you will learn almost everything about concrete. Concrete is the most used material in construction worldwide. We can find concrete almost in everything around us. Therefore, we need to understand the properties and behavior of this material and what the reason behind using it intensively in construction. Concrete is a durable and it live for a long time. That's why it is preferred in construction of house and building. In this course, we will study the different ingredients of concrete. Also, I will explain the admixture and how various admixtures can alter concrete properties. Recently the using of pozzolans increased sharply, adding of pozzolans to the concrete mix will enhance concrete properties. We will discuss the different type of pozzolans and their effects on concrete. Also, in this course, you gain knowledge regarding SCC and fiber reinforced concrete. Concrete is very good in compressi...

The main function of diaphragms is to provide a stiffening effect to deck slab in case bridge webs are not situated directly on top of bearings. Therefore, diaphragms may not be necessary in case bridge bearings are placed directly under the webs because loads in bridge decks can be directly transferred to the bearings.On the other hand, diaphragms also help to improve the load-sharing characteristics of bridges. Diaphragms also contribute to the provision of torsional restraint to the bridge deck. Diaphragm will be used also to resist stresses that occurs during the post-tensioning process. Post-tensioning hardware are casted inside the diaphragm. Figure 1 construction management: concrete construction bridge construction:How to become a bridge engineer Types of diaphragm: Diaphragm at the span end: this type of diaphragms will be located between two bridge spans or at the bridge abutments. Expansion joints will be used to connect bridge spans. This expansion joint will be installed o...

Join from here Join the course   This course designed to expand your practical side of engineering knowledge. This course is concentrating on the construction of roads. Here you will learn how the road constructed. The construction stages such as protection of existing services, clearing the area, future utilities, preparing the road subgrade, then placing different pavement layers such as sub-base, base course, and asphaltic courses. Also, we will discuss the types of asphaltic course and the common defects of asphaltic pavement, such as permanent deformation, fatigue cracking, and low-temperature cracking. Also, I will show a typical cross-section of road and road profiles.  Also, I will explain what the prime coat is, why the prime coat is used, and the proper way of applying, preparing the surface of the pavement layer before applying the prime coat, and the curing time for a prime coat. Tack coat, what is the Tack coat, why the Tack coat used, where the tack coat is used,...

  Lowering the groundwater table will significantly improve the soil properties. Reducing of the groundwater table is a time-limited process and not always possible. Under running steams. Where the settlement could affect an important area adversely such as inside cities groundwater lowering should not be allowed. Also, it should not be permitted if the groundwater lowering could impact the flora and existing water supply aquifers. Groundwater lowering methods will required arrangement for storing the water. In some cases, it is necessary to treat the water before discharge it.  In permeable strata where the permeability, k, exceeds about 10–3 cm/s, or where an aquifer can be dewatered below less permeable strata, the level of the water table over a wide area can be drawn down by pumping from boreholes and deep wells. These processes are widely used in open excavations and are also suited to cut-and-cover tunnels and shallow bored tunnel. Figure 1 construction management: conc...

Publish your paper from  here This paper is a study that summarizes, the procedure used to increase the capacity of an existing concrete bridge in the UAE. Traffic congestion is a severe problem in modern life. Severe congestion can negatively impact the country's economy, environment, and the health of road commuters. The increase in trip duration due to traffic congestion will result in consuming more fuel which results in a higher cost of trip and more emissions which affect both the economy and the environment. Moreover, the road commuter will be traveling for a long time which can affect their sleeping hours and mental health. Constructing more roads, and bridges and encouraging people to use public transport are some of the measures taken to reduce traffic congestion. To evaluate the effectiveness of an existing highway, certain parameters such as traffic quantity, type of vehicles in the traffic stream, speed of traffic stream, and the density of traffic stream will be measu...

Publish your paper from  here This paper compares the actual settlement of the pile foundation with the anticipated theoretical settlement computed using various methods. The piles under investigation were constructed to support a bridge structure and they are cast-in-situ piles. The bridge structure is supported by three groups of piles with pile lengths ranging from 11 m to 14 m and a diameter of 1.20 m. Detailed geotechnical investigations were performed to determine the soil's mechanical and chemical properties. Moreover, four piles were loaded statically to verify the viability of the design. kentledge method for testing was used, the concrete block was used as a counterweight and the main load was generated by the use of Hydraulic jacks, the settlement of piles recorded for each load increment. Four strain gauges were used to record the settlement of piles. The estimation of pile foundation theoretical settlement is performed by the use of various equations suggested by each ...

Publish your paper from  here This paper summarizes the common procedures and measures used on construction sites to control the quality of executed works. The presence and implementation of a quality management system will ensure that the construction meets client requirements. The presence of a quality management system alone is not sufficient; the correct and strict implementation of a quality management system is substantial. The implementation of a quality management system in construction requires the collaboration of the client, contractor, and engineer (a client representative). The practical side of quality management systems is discussed in this paper, and the construction of a stormwater network in the UAE is taken as an example and case study. This paper is mainly focused on quality in construction projects. Controlling the quality of construction projects will pass through various stages. And it is not limited to construction activities. The control of construction act...

Publish your paper from  here The economic growth of any country relies on many factors, such as natural resources, technology, manpower, regulations, and infrastructure. Infrastructure is essential for country development. Road networks are part of the infrastructure of any country. The presence of a reliable road network will facilitate the shipping of goods, which will save time and money and contribute to economic growth. A road network is considered reliable when it reduces the journey time, provides the best routes, properly covers a country or area, reduces the delay of public transportation, contributes to economic growth, and ensures a smooth ride. Building a high-quality road pavement that meets the needs of road users and ensures smooth riding requires good planning, design, and construction of the pavement. The construction of durable pavement can be attained through the collaboration of reliable design, selecting high-quality and suitable raw materials, appropriate asp...