Population Is Increasing but Humanity Is Not : the Role of Prophet Mohammad {Saw} in Elevation of Humanity
7 Pavement Joints
Types of Joints
D-1 Contraction Joints Longitudinal Joints Transverse Construction Joints Terminal Joints Expansion Joints Retro-fitted Tie Bars
Sealing Joints
CHAPTER SEVEN: PAVEMENT JOINTS __________________________________________
Pavement joints are vital to control pavement cracking and pavement movement. Without joints, most concrete pavements would be riddled with cracks within one or two years after placement. Water, ice, salt and loads would eventually cause differential settlement and premature pavement failures. These same effects may be caused by incorrectly placed or poorly designed pavement joints. The Technician is responsible for inspecting all joints to avoid any of the problems associated with joint failure. Forethought should be given to the design and placement of the pavement joints so that the end result is a properly functioning pavement system. Special care is given at intersecting approaches, turn lanes and crossovers so that the joints required at these locations will complement the joints placed in the mainline pavement. Since the mainline pavement is typically placed prior to any auxiliary pavement, the location of all joints is required to be known in advance of the initial pours. If the initial joint placement is correct, the extension of the same joint lines throughout any adjacent pavements is done. "Dead ending" of joints in the middle of adjacent slabs is avoided whenever possible to prevent the risk of reflective cracking. An example of a well planned joint design is shown in Figure 7-1. The joints in this diagram are continuous from edge of pavement to edge of pavement. Also, the joints in the mainline pavement are aligned to serve the joints in the adjoining pavements. The following pavement joints and related materials are discussed: 1) D-1 contraction joints 2) Longitudinal joints 3) Transverse construction joints 4) Terminal joints 5) Expansion joints 6) Retrofitted tie bars
Types of Joints
D-1 Contraction Joints Longitudinal Joints Transverse Construction Joints Terminal Joints Expansion Joints Retro-fitted Tie Bars
Sealing Joints
CHAPTER SEVEN: PAVEMENT JOINTS __________________________________________
Pavement joints are vital to control pavement cracking and pavement movement. Without joints, most concrete pavements would be riddled with cracks within one or two years after placement. Water, ice, salt and loads would eventually cause differential settlement and premature pavement failures. These same effects may be caused by incorrectly placed or poorly designed pavement joints. The Technician is responsible for inspecting all joints to avoid any of the problems associated with joint failure. Forethought should be given to the design and placement of the pavement joints so that the end result is a properly functioning pavement system. Special care is given at intersecting approaches, turn lanes and crossovers so that the joints required at these locations will complement the joints placed in the mainline pavement. Since the mainline pavement is typically placed prior to any auxiliary pavement, the location of all joints is required to be known in advance of the initial pours. If the initial joint placement is correct, the extension of the same joint lines throughout any adjacent pavements is done. "Dead ending" of joints in the middle of adjacent slabs is avoided whenever possible to prevent the risk of reflective cracking. An example of a well planned joint design is shown in Figure 7-1. The joints in this diagram are continuous from edge of pavement to edge of pavement. Also, the joints in the mainline pavement are aligned to serve the joints in the adjoining pavements. The following pavement joints and related materials are discussed: 1) D-1 contraction joints 2) Longitudinal joints 3) Transverse construction joints 4) Terminal joints 5) Expansion joints 6) Retrofitted tie bars