Civil Engineering Hub

WHY Test Concrete? Concrete testing is carried out for many reasons: Evaluation new materials or products Check compliance before, during or after construction Assess condition for change of use or service life prediction Failure investigation WHAT Can Be Tested? Concrete testing means more than cubes or cores: Component materials ; cement, pfa, ggbs, admixtures, coarse and fine aggregates, fibres, reinforcement, water Fresh Concrete , mortar and grout Hardened Concrete ; cast specimens : cubes , cylinders, prisms Existing structures ; drilled core or dust samples, sawn specimens, insitu non-destructive testing of structural members WHICH Tests? Concrete testing is loosely covered by four main headings: Physical/Mechanical Workability/Consistency Compressive/flexural/tensile strength Modulus of elasticity Density/water absorption/permeability Moisture/thermal movement Chemical Composition (cement content, w/c ratio) Presence of contaminants, e...

Download - Click Here Common Properties of Visual Basic Every object, such as a form or control, has a set of properties that describe it. Although this set isn't identical for all objects, some properties (such as those listed in the table below) are common to most controls. You can see every design-time property for a given control by looking at the Properties window in the IDE (some controls have properties that are available only at run-time – such as the SelectionStart and SelectionLength properties of the Textbox). Common Events of Visual Basic .NET Controls Events are what happen in and around your program. For example, when a user clicks a button, many events occur: The mouse button is pressed, the CommandButton in your program is clicked, and then the mouse button is released. These three things correspond to the MouseDown event, the Click event, and the MouseUp event. During this process, the Focus event for the CommandButton and the Leave event for whicheve...

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CHARECTERISTICS OF WASTEWATER Download - Click Here Physical characteristics 1. Solids          C omposed of floating matter, settleable matter, colloidal matter and        matter in solution. Total Suspended Solids (TSS) Ø Total suspended solids (TSS) include all particles suspended in water which will not pass through a filter. Ø As levels of TSS increase, a water body begins to lose its ability to support a diversity of aquatic  life. Ø Suspended solids absorb heat from sunlight, which increases water temperature and subsequently decreases levels of dissolved oxygen Total Dissolved Solids (TDS) TDS are passed through the filter. TDS comprised of colloidal and dissolved solids. Colloids are typically in the size range from 0.001 to 0.45 μ m Volatile Suspended Solids (VSS) Those solids that can be volatilized and burned off when the TSS are ignited. V...

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Properties of Engineering Materials Download - Click Here What do engineers do?  Engineers apply the principles of science and mathematics to develop economical solutions to technical problems.  They are concerned with the structure and properties of materials used in modern technology to improve the design and fabrication What are materials? The term “material” is defined in different ways. Materials are the substances of which something is  made or composed of. Can simply group them as;  Solid  Liquid  Gas Historical Development Materials have been fundamental to the development of civilization. materials used by the different civilizations such as  Stone Copper  Bronze Iron age Material age