Introduction to Concrete in Construction

To bind the aggregates into a solid mass

For nonstructural elements where tensile forces are minimal

To improve resistance to tensile forces

<p>To absorb tensile stresses and prevent failure</p> Signup and view all the answers

<p>8% to 14%</p> Signup and view all the answers

<p>To increase the tensile strength of concrete</p> Signup and view all the answers

<p>It is weak in tension and prone to abrupt failure</p> Signup and view all the answers

<p>To decrease the setting time</p> Signup and view all the answers

<p>To improve the workability of concrete</p> Signup and view all the answers

<p>Cement</p> Signup and view all the answers

<p>Plain concrete is composed of hardened mixture of cement, water, and aggregates and is only suitable for nonstructural elements due to its minimal tensile strength. Reinforced concrete, on the other hand, includes reinforcing bars to absorb tensile stresses, making it suitable for structural elements.</p> Signup and view all the answers

<p>Concrete has a tensile strength ranging from 8% to 14% of its compressive strength. Due to this low tensile capacity, flexural cracks develop at early stages of loading.</p> Signup and view all the answers

<p>Reinforcing bars in reinforced concrete absorb the tensile stresses and yield before the beam undergoes total failure, enhancing the structure's strength and durability.</p> Signup and view all the answers

<p>Concrete's composition of coarse aggregate, fine aggregate, cement, admixtures, small air voids, and water, when mixed properly, forms a paste that binds the aggregates into a solid mass, giving concrete its strength and durability.</p> Signup and view all the answers

<p>Plain concrete is only suitable for nonstructural elements where tensile forces are minimal. If used for structural elements, plain concrete cannot withstand tensile stresses, leading to abrupt and brittle failure.</p> Signup and view all the answers

<p>Plain Concrete = Composed of cement, water, and aggregates Reinforced Concrete = Utilizes reinforcing bars to absorb tensile stresses Prestressed Concrete = Pre-compressed to counteract tensile stresses Composite Material = Combines coarse aggregate, fine aggregate, cement, admixtures, air voids, and water</p> Signup and view all the answers

<p>Concrete suitable for nonstructural elements with minimal tensile forces = Plain Concrete Concrete strong in compression but weak in tension = Reinforced Concrete Concrete with low tensile capacity and prone to flexural cracks = Reinforced Concrete Concrete that counteracts tensile stresses through pre-compression = Prestressed Concrete</p> Signup and view all the answers

<p>Cement = Forms a paste that binds aggregates into a solid mass Fine Aggregate (Sand) = Contributes to the composition of concrete Admixtures = Incorporated to modify the properties of concrete Water = Essential for forming the paste with cement</p> Signup and view all the answers

<p>8% to 14% of its compressive strength = Tensile strength of concrete Percentage of tensile strength compared to compressive strength = 8% to 14% Tensile strength's impact on behavior under loading = Flexural cracks at early stages of loading Low tensile capacity and potential for abrupt failure = Plain Concrete</p> Signup and view all the answers

<p>Reinforcing bars absorbing tensile stresses = Prevents abrupt and brittle failure of concrete Proper design of reinforcing bars = Yields before total failure of the structure Yielding before total failure = Reinforcing bars Prevention of abrupt and brittle failure = Properly designed reinforcing bars</p> Signup and view all the answers