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  A joint or construction joint refers to a concrete joint that is used when a new concrete section or slab has to be joined adjacent to the existing section. It is primarily developed to allow horizontal movement and safeguard against vertical movements. The construction joint prevents the development of excess stress in the concrete structure, leading to expansion and contraction due to moisture, loads, temperature changes, vibrations, etc. Why Joint Sealing is Needed? Since the joint expands and contracts due to the various changes mentioned above, it becomes essential to seal the joints so that any penetration of gases, liquids, and solids in the formed gaps can be prevented. Although the polysulphide sealant is the best sealant, used for sealing the construction joints, the choice of sealant may also depend on the joint design. Sealing the joints in buildings prevents the entry of air and water. When it comes to water retaining structures such as pipes, tanks, canals, dams, e...

Since adhesives and sealants are composed of similar materials and both adhere and seal, they often find use in similar applications. However, this is not always the case because a number of times they are designed to perform varied functions. Let us understand the two terms in the following section.  Adhesives An adhesive is a substance, which robustly and permanently holds a minimum of two surfaces together. The holding and bonding power, high shear, tensile strength, and environmental resistance are the major reasons why adhesives are so much preferred. Not just that, some adhesives, for example, coal tar epoxy paint, are also used for anti-corrosion applications. Structural adhesives in particular have high shear strength and resistance to weather. They are therefore essential for the success of the structure assembly. On the other hand, non-structural adhesives have low strength and are used for temporary bonding purposes. Wood glue, elastomers, pressure-sensitive...

In one of our previous blogs, we learned about the causes of pipe corrosion. The most common were acidic water, high concentration of oxygen in water, temperature and speed, and presence of sediments, bacteria, minerals, and metals in the water. All these factors cause different types of corrosion to the pipeline, the treatment of which is of utmost importance.  There are some significant methods of treating corrosion including coal tar epoxy coating, plant-applied tape system, polyolefin, etc. However, before finding a suitable treatment it is important to know about the type of corrosion taking place in the pipe. So, let us read about that first, in the following section.  The Major Types Of Corrosion In Pipelines Uniform Pipe Corrosion The uniform pipe corrosion results in uniform damage or loss of the material at the pipe surface. This leads to a constant thinning of the wall. The intensity of the corrosion depends on the degree of penetration of the surfa...