RCC & MS BAR Study Material PDF

2.2 RCC & MS BAR Study Material Basic Material- I Semester I, B.Voc Interior Design Module 2.2.4  RCC RCC, which stands for Reinforced Concrete Cement, is a widely...

2.2 RCC & MS BAR Study Material Basic Material- I Semester I, B.Voc Interior Design Module 2.2.4  RCC RCC, which stands for Reinforced Concrete Cement, is a widely used construction material known for its strength and durability. It is composed of a mixture of cement, water, aggregates (such as sand and gravel), and reinforcement bars (usually made of steel) to enhance its structural properties. ` Advantages of RCC Structures made from Reinforced Concrete are durable. It has a high compressive strength (due to concrete). It has a high tensile strength (due to reinforcement). It is resistant to fire and other climate changes. Easily available almost anywhere in the world. Too much expertise is not required for working on it, normal skilled labour can also do it. It can be moulded in any form, shape. It can be used in any part of the structure i.e., from foundation to the top roofing. Repairing cost is almost nil. It is more economical compared to other materials. Properties Compressive Strength Flexural Strength-Due to the difficulty in obtaining sawed beam specimens from RCC pavements and the lack of a standardized method for compacting RCC beams in the lab, there is limited data on RCC flexural strengths. However, projects that did test flexural strength have shown that RCC can yield flexural strengths in the range of 500-1,000 psi. According to the National Concrete Pavement Technology Centre, flexural strength is directly related to density and compressive strength of the RCC mixture Modulus of Elasticity-The elastic modulus, the ratio of stress to strain, of RCC has been suggested to be similar or slightly higher than that of conventional concrete based on limited testing of field cores. Bond Strength-The bond strength between layers of RCC, which is different from the bond strength for conventional concrete pavements, is of particular concern for RCC pavements. The bond between layers will dictate the bond condition (i.e. fully bonded, partially bonded, or unbonded). Partially bonded or unbounded RCC layers will yield a lower structural capacity for the same total thickness as fully bonded RCC layers. It has been shown that RCC layers compacted within 60 minutes of each other yield sufficient bond strength to be considered fully bonded. Durability-RCC pavements can be subjected to two types of deterioration as a result of freezing and thawing conditions: internal cracking and surface scaling. Historically, RCC pavements in northern climates have performed well as shown by a study of 34 RCC pavements that ranged in age from 3-20 years. Characterizing freeze-thaw durability of RCC has typically shown poor performance but good performance has been found when used. Proper materials selection and adequate field compaction are essential to achieving good freeze-thaw performance for RCC pavements. Shrinkage-Due to lower water contents of RCC compared to conventional concrete pavements, RCC normally has less shrinkage and cracking. Thermal expansion and contraction properties of RCC are expected to be similar to those of conventional concrete pavements for similar materials. Advantages of RCC: Strength and Load-Bearing Capacity: RCC structures can withstand heavy loads and are suitable for constructing tall buildings, bridges, and other infrastructure projects that require high load-bearing capacity. Design Flexibility: RCC offers a wide range of design possibilities due to its moldability and versatility. It can be shaped to meet complex architectural designs and structural requirements. Cost-Effective: RCC is generally considered a cost-effective construction material, especially for large-scale projects. The availability of raw materials and its efficient production methods contribute to its affordability. Longevity and Low Maintenance: RCC structures have a long service life and require minimal maintenance compared to other materials. This results in cost savings over the life cycle of a structure. Disadvantages of RCC: Construction Time: RCC structures often require longer construction time compared to other building materials. The curing and setting time of concrete can delay the overall construction schedule. Brittle Nature: Although RCC has high compressive strength, it can be relatively brittle when subjected to bending or tension forces. The use of steel reinforcement helps mitigate this, but careful design and construction practices are necessary to avoid structural failures. Heavy Weight: RCC structures can be heavy, which may require strong foundation systems to support the weight. Transporting and handling large RCC elements can also be challenging. Sustainability: The production of cement, a key component of RCC, contributes to carbon emissions. The extraction of raw materials, such as aggregates, can also have environmental impacts. However, efforts are being made to improve the sustainability of RCC through eco-friendly practices and the use of alternative materials.  MS BAR Mild steel bars are used for tensile stress of RCC (Reinforced cement concrete) slab beams etc. in reinforced cement concrete work. These steel bars are plain in surface and are round sections of diameter from 6 to 50 mm. These rods are manufactured in long lengths and can be cut quickly and be bent easily without damage. Mild steel, also called plain-carbon steel is a type of steel alloy which is the most common high volume steel in production. Mild steel contains a small amount of carbon and provides material properties that are acceptable for many applications. In order for steel to be considered low carbon, there are certain characteristics it must meet. For example, the steel has to have less than 0.3% carbon in its total make-up to be considered low carbon. Mild steel is considered the most common form of steel as the cost is comparatively small, so is generally used when large amounts of steel are needed. Unlike other grades of carbon steel, which tend to be brittle, mild steel is very hard, yet malleable, making it the perfect choice for construction materials. Mild Steel can be easy to shape and machine because it is very flexible and can be hardened by a heat treatment process called carburising. This makes it a suitable material for producing a variety of products in the consumer industry. Even though there are lots of metals (like Aluminium, Cast iron ) available for reinforcing concrete, Mild Steel is the most widely used reinforcing material in reinforced concrete. It is highly ductile. MS can be recycled easily. It can be easily welded. It is widely and cheaply available compared to other ductile metals. Characteristics and Properties: Strength: MS bars have high tensile strength, which means they can resist high tensile forces and prevent structural failure. The strength of MS bars ensures the stability and load-bearing capacity of reinforced concrete structures. Ductility: MS bars exhibit good ductility, which allows them to deform without fracturing under excessive loads. This property is crucial in seismic-prone areas where structures need to absorb and dissipate energy during earthquakes. Weldability: MS bars are easily weldable, enabling them to be joined together to form complex structural configurations. This weldability makes them versatile and allows for the construction of intricate reinforced concrete designs. Corrosion Resistance: MS bars have a certain level of corrosion resistance. However, they are not as corrosion- resistant as stainless-steel reinforcement. Proper protective measures, such as adequate concrete cover and protective coatings, should be applied to prevent corrosion in aggressive environments. Advantages of MS Bars: Strength and Durability: MS Bar provides additional tensile strength to concrete structures, enhancing their load-bearing capacity and overall durability. It helps prevent cracks and structural failures by distributing loads effectively. Easy Handling and Fabrication: MS Bar is lightweight and easy to handle, allowing for convenient transportation and installation on construction sites. It can be easily cut, bent, and welded to meet specific design requirements. Wide Availability: MS Bar is readily available in various lengths and diameters, making it accessible for construction projects of different scales. Its wide availability ensures a steady supply for construction needs. Cost-Effective: MS Bar is generally more cost-effective compared to other types of steel reinforcement, such as high-strength steel or stainless steel. It offers a good balance between strength and cost, making it suitable for many construction applications. Disadvantages of MS Bar: Corrosion Susceptibility: MS Bar is prone to corrosion when exposed to moisture, oxygen, and corrosive environments. Without proper protection, such as coatings or corrosion inhibitors, it may corrode over time, leading to potential structural integrity issues. Lower Strength Compared to Other Steel Types: While MS Bar provides adequate strength for many construction applications, it has lower strength compared to high-strength steel or specialty reinforcement materials. In certain situations where higher strength is required, alternative reinforcement options may be preferred. Environmental Impact: The production of steel, including MS Bar, involves energy-intensive processes and contributes to carbon emissions. Steps are being taken to improve the sustainability of steel production, but it remains an area of concern.