際際滷

際際滷Share a Scribd company logo

fire fighting and retardation (2).pptx

Download as PPTX, PDF
P
PratikshaJadhav74

This document discusses curtain wall construction and sealants. It introduces how curtain wall construction arose in the 1950s using a skeleton frame wrapped with non-bearing panels, rather than load-bearing walls. This allowed more flexible building designs. New elastomeric sealants were also introduced to adhere between various panel surfaces and accommodate movement. The document describes the functions of sealants in waterproofing, insulation, and filling gaps. It lists common applications of sealants and various types used. Advantages include improved durability while disadvantages include sealant deterioration over time potentially causing adhesion or cohesion failure.

Convert to study materialsBETA

Transform any presentation into ready-made study materialselect from outputs like summaries, definitions, and practice questions.

1 of 10
Download to read offline
INTRODUCTION The Early 1950s saw the application of the new concept of curtain-wall construction in high-rise structures through out the world. This concept was based on the use of a skeleton of steel or concrete that was then wrapped in a separate envelope or non bearing curtain wall. This reduced the use of the low-rise bearing wall type construction and introduced greater flexibility in design through the use of precast concrete panels, glass or metal panels, unit masonry, and combinations of these materials. Construction was also become much faster, also these structure are inherently more flexible than bearing-wall construction, but present new problems is weather proofing. Sealents
The introduction of the curtain wall was accompanied by the introduction of elastomeric sealants that would adhere to the various surfaces and take greater movement than had existed in the older expansion joints. The old oil-based caulking compounds no longer qualified, and the new materials became SEALANTS rather than caulks. However, the term SEALANT has been too broadly used and now includes a wide assortment of weather proofing joint materials. Sealants or caulking compounds include viscous liquids, pastes, tapes, gaskets, and even water proofing membranes. The materials can either cure to a rubber or remain in a mastic stage.
Functions Sealants, despite not having great strength, convey a number of properties. They seal top structures to the substrate, and are particularly effective in waterproofing processes by keeping moisture out (or in) the components in which they are used. They can provide thermal and acoustical insulation, and may serve as fire barriers. They may have electrical properties, as well. Sealants can also be used for simple smoothing or filling. They are often called upon to perform several of these functions at once. A corking sealant has three basic functions: It fills a gap between two or more substrates; it forms a barrier through the physical properties of the sealant itself and by adhesion to the substrate; and, it maintains sealing properties for the expected lifetime, service conditions, and environments. The sealant performs these functions by way of correct formulation to achieve specific application and performance properties.
fire fighting and retardation (2).pptx
Applications Horizontal and vertical metal-to-metal and masonry-to-masonry expansion and control joints Dissimilar material joints, such as metal-to- masonry or concrete-to-wood Joints between precast concrete fa巽ade panels Spandrels Perimeter of doors and fixed window frames Exposed exterior masonry control joints Expansion or control joints in curtain wall Joints in exterior walls Concealed masonry-to-floor structure joints Repair of larger cracks
fire fighting and retardation (2).pptx
Types of Construction Sealants Silicone Sealants Epoxy Hybrid Polyurethanes Sealants Polyurethanes Sealants Elastic Sealants Varnish Acrylic Latex Sealants Bituminous Sealants Synthetic Rubber Sealants Thermoplastics Sealants Butyl Sealants Hot Wax Proof Sealants Polysulfide Sealants
fire fighting and retardation (2).pptx
Advantages Improves Product Durability and Reliability. Increases Product Performance. Increases Design Flexibility. Increases Product Quality. Enhances Product Aesthetics. Improves Process Productivity and Reduced Manufacturing Costs. Increases weathering characteristics.
Disadvantages Deterioration of sealants causes due to prolonged exposure to water, ultraviolet light, and freeze-thaw cycles. Loss of Adhesion caused by the presence of coatings or contaminants that prevent proper adhesion. Cohesive failure due to deterioration of the internal integrity of the sealant; cracking parallel to the interface of the joint is an indication of this type of failure. Inappropriate Choice of Sealant and Improper Joint Design may fail the joint and losses the adhesion. Uncured Sealant that is uncured is often due to incomplete or improper mixing of the sealant components, or from using materials that have outlived their shelf life losses the adhesion and fails the joints. Bubbling and Blistering of the Surface losses the adhesion and fails the joints.

More Related Content

fire fighting and retardation (2).pptx

  • 1. INTRODUCTION The Early 1950s saw the application of the new concept of curtain-wall construction in high-rise structures through out the world. This concept was based on the use of a skeleton of steel or concrete that was then wrapped in a separate envelope or non bearing curtain wall. This reduced the use of the low-rise bearing wall type construction and introduced greater flexibility in design through the use of precast concrete panels, glass or metal panels, unit masonry, and combinations of these materials. Construction was also become much faster, also these structure are inherently more flexible than bearing-wall construction, but present new problems is weather proofing. Sealents
  • 2. The introduction of the curtain wall was accompanied by the introduction of elastomeric sealants that would adhere to the various surfaces and take greater movement than had existed in the older expansion joints. The old oil-based caulking compounds no longer qualified, and the new materials became SEALANTS rather than caulks. However, the term SEALANT has been too broadly used and now includes a wide assortment of weather proofing joint materials. Sealants or caulking compounds include viscous liquids, pastes, tapes, gaskets, and even water proofing membranes. The materials can either cure to a rubber or remain in a mastic stage.
  • 3. Functions Sealants, despite not having great strength, convey a number of properties. They seal top structures to the substrate, and are particularly effective in waterproofing processes by keeping moisture out (or in) the components in which they are used. They can provide thermal and acoustical insulation, and may serve as fire barriers. They may have electrical properties, as well. Sealants can also be used for simple smoothing or filling. They are often called upon to perform several of these functions at once. A corking sealant has three basic functions: It fills a gap between two or more substrates; it forms a barrier through the physical properties of the sealant itself and by adhesion to the substrate; and, it maintains sealing properties for the expected lifetime, service conditions, and environments. The sealant performs these functions by way of correct formulation to achieve specific application and performance properties.
  • 5. Applications Horizontal and vertical metal-to-metal and masonry-to-masonry expansion and control joints Dissimilar material joints, such as metal-to- masonry or concrete-to-wood Joints between precast concrete fa巽ade panels Spandrels Perimeter of doors and fixed window frames Exposed exterior masonry control joints Expansion or control joints in curtain wall Joints in exterior walls Concealed masonry-to-floor structure joints Repair of larger cracks
  • 7. Types of Construction Sealants Silicone Sealants Epoxy Hybrid Polyurethanes Sealants Polyurethanes Sealants Elastic Sealants Varnish Acrylic Latex Sealants Bituminous Sealants Synthetic Rubber Sealants Thermoplastics Sealants Butyl Sealants Hot Wax Proof Sealants Polysulfide Sealants
  • 9. Advantages Improves Product Durability and Reliability. Increases Product Performance. Increases Design Flexibility. Increases Product Quality. Enhances Product Aesthetics. Improves Process Productivity and Reduced Manufacturing Costs. Increases weathering characteristics.
  • 10. Disadvantages Deterioration of sealants causes due to prolonged exposure to water, ultraviolet light, and freeze-thaw cycles. Loss of Adhesion caused by the presence of coatings or contaminants that prevent proper adhesion. Cohesive failure due to deterioration of the internal integrity of the sealant; cracking parallel to the interface of the joint is an indication of this type of failure. Inappropriate Choice of Sealant and Improper Joint Design may fail the joint and losses the adhesion. Uncured Sealant that is uncured is often due to incomplete or improper mixing of the sealant components, or from using materials that have outlived their shelf life losses the adhesion and fails the joints. Bubbling and Blistering of the Surface losses the adhesion and fails the joints.