Active protection of fiber-reinforced polymer-wrapped reinforced concrete structures against corrosion

Large numbers of reinforced concrete (RC) structures that have been damaged from corrosion of steel reinforcements are rehabilitated with fiber-reinforced polymer (FRP) composites. This paper investigates active protection of the steel embedded in concrete that is treated with surface-bonded carbon FRP. The electrically conductive carbon fiber is used as an anode while the reinforcing bar is used as a cathode. Concrete cylinder specimens with embedded steel bars are immersed in salt water, and anodic current is passed through the reinforcement to initiate cracking in concrete as a result of accelerated corrosion of steel. Carbon FRP sheets have been bonded adhesively to the cylinders. The adhesive has been modified to impart electrical conductivity. Specimens were exposed to a highly corrosive environment for a specified time. Pullout strength, mass loss, potentiodynamic scans, and the half-cell potential of steel are reported as metrics of performance of the samples. The proposed technique has been very effective in retarding the corrosion of steel

Step Wise Management of Asyndromic Tooth Agenesis with Ankyloglossia: A Case Report

Ankyloglossia or tongue tie refers to restricted tongue movements, diagnosed in early childhood and adolescence that may cause changes in bone growth and other orofacial tissues results in altered oral functions of the child. It also affects speech, mastication and oral hygiene as well as social environment. Patients with oligodontia and tongue tie may have psychological, aesthetic, phonetic and functional problems. A rare case of female child patient with congenital partial anodontia and associated ankyloglossia with its comprehensive step wise multidisciplinary management is presented. The patient was advised for frenectomy to relieve tongue tie and functional fixed aesthetic space maintainer at an early age and was followed-up to be treated with definitive implant prosthesis with respect to the missing teeth. Early treatment and follow-up is the key to successful rehabilitation of young patients with congenitally missing teeth and ankyloglossia. It is imperative that oral rehabilitation be started as early as possible to maintain and correct the oral functions. This clinical report describes a successful aesthetic, functional, and psychological rehabilitation of a young adolescent girl with partial anodontia in mandibular anterior region and associated extensive tongue tie with step by step surgical and prosthetic management in accordance with the physical growth pattern of patient. It also offers guidelines for comprehensive management which can be used by the treating pedodontist and oral surgeon for diagnosis and treatment of ankyloglossia and partial anodontia

Corrosion of steel reinforcements embedded in FRP wrapped concrete

A large number of reinforced concrete (RC) structures that have been damaged due to corrosion of steel reinforcements are rehabilitated with fiber-reinforced polymer (FRP) composites. This paper investigates the progression of corrosion of steel in concrete after it has been treated with surface bonded FRP. Concrete cylinders with embedded steel bars are immersed in salt water and anodic current is passed through the reinforcement to initiate cracking in concrete due to accelerated corrosion of steel. Glass and carbon FRP sheets have been adhesively bonded on the cylinders. Anodic current was continued for specified times. Pull out strength, mass loss, half cell potential of the steel and cell voltage have been reported as metrics of performance of the samples. FRP wrapped samples have shown substantially higher resistance to corrosion

Corrosion protection of fiber-reinforced polymer-wrapped reinforced concrete

Reinforced concrete (RC) flexure members such as bridges, slabs, and beams that have been damaged due to the corrosion of steel reinforcement are often rehabilitated with fiber-reinforced polymer (FRP) composites. This paper investigates passive as well as active protection of the steel reinforcing bar in RC flexure members that are treated with surface bonded FRP. Passive protection is investigated using glass FRP (GFRP) and carbon FRP (CFRP) sheets that have been adhesively bonded to the beam specimens. Active protection has been studied using electrically conductive carbon fiber wraparounds as an anode while the reinforcing bar is used as a cathode. Accelerated corrosion is inflicted in RC beams by immersing them in saltwater and passing anodic current through the reinforcement. For investigating active protection, the adhesive has been modified to impart electrical conductivity. Specimens were exposed to a highly corrosive environment for a specified time. Flexure strength, mass loss, and half-cell potential are reported as metrics of performance of the samples. The proposed technique has been very effective in retarding the corrosion of steel

Short stature with umbilical hernia - Not always due to cretinism: A report of two cases

A 7-year-old boy presented with umbilical hernia and short stature. Growth retardation, recurrent upper respiratory tract infections and delayed developmental milestones were present from infancy. Umbilical hernia was diagnosed at the age of 5 years. On examination, he had short-trunk dwarfism, large head circumference, coarse facial features, joint stiffness, hepatosplenomegaly, and mild mental retardation. He had normal biochemical parameters, thyroid function tests and arterial blood gas analysis. Radiological evaluation showed that the child had Hunter syndrome with findings of J-shaped sellaturcica, proximal bulleting of metacarpals, spatulated ribs and anterior beaking of lumbar vertebrae. The second case was a 6-year-old girl with umbilical hernia, short stature, normal biochemistry and radiological findings of mucopolysaccharidosis. However, she also had corneal opacity; confirmed by slit-lamp examination, which led to the diagnosis of Hurler-Scheie syndrome. Enzymatic studies could not be done in both the cases, as they are not available at most centers

A Case study of Dushta Vrana treated with DurvaTail Vranabasti

“The destruction / break / rupture / discontinuity of body tissue / part of body, is called Vrana.â€A clean wound in a normal body heals earlier with a minimum scar as compared to contaminated wound. Wound healing is mechanism where the body attempts to restore the integrity of the injured part. Several factors affects the normal process of wound healing such as the site of wound, contamination (foreign bodies/bacterial), local factors like vascular insufficiency or previous radiation, systemic factors such as malnutrition, Disease like diabetes mellitus, Immune deficiencies and medications  like steroids.  Acharya Sushruta mentioned 60 Upakramas for the management of Vrana and local application of DurvaTail Vrana Basti is one among them. The local application of VranaBasti is one of the best substitutes for of chronic wound healing & the DurvaTail have better shodhana & ropana effect. A case report of 34 year – old man, who presented with complaints of an open traumatic ulcer on the dorsum of the right foot associated with pain, discharge, slough, foul smell, oedema and discolouration of the skin has been presented here