CivilJungle

  • Home
  • Civil
    • Detail A to C >>
      • Aggregate
      • Beam
      • Bitumen
      • Brick
      • Bridge
      • Cement
      • Civil
      • Column
      • Concrete
    • Detail D to I >>
      • Dampness
      • Design
      • Difference
      • Electrical
      • Excel Sheet
      • Flooring
      • Formwork
      • Foundation
      • Irrigation
    • Detail J to R >>
      • Mortar
      • Plaster
      • Pile
      • Plumbing
      • Quantity Survey
      • Reinforcement
    • Detail S to S >>
      • Sampling
      • Self Compact Concrete
      • Slab
      • Soil Mechanics
      • Staircase
      • Stone
      • Survey
    • Detail T to Z >>
      • Technology
      • Test
      • Transportation
      • Window
      • Wood
  • Difference
    • Difference Between A to C >>
      • Difference Between 33, 43 and 53 Grade Cement
      • Difference Between Asphalt and Bitumen
      • Difference Between Beam and Column
      • Difference Between Bitumen and Tar
      • Difference Between Bridge and Culvert
      • Difference Between Carpet Area and Built-up Area
      • Difference Between CPM and PERT/PERT Vs CPM
    • Difference Between F to L >>
      • Difference Between Fat Lime and Hydraulic Lime
      • Difference Between Flexible Pavement and Rigid Pavement
      • Difference Between Flyover and Bridge
      • Difference Between Footing and Foundation
    • Difference Between L to M >>
      • Difference Between Lap Length and Development Length
      • Difference Between Lime and Cement
      • Difference Between M Sand Vs River Sand
      • Difference Between M25 and M30 Concrete
      • Difference Between Mortar and Concrete
    • Difference Between N to P >>
      • Difference Between One Way Slab and Two Way Slab
      • Difference Between OPC Vs PPC
      • Difference Between Plasticizer And Superplasticizer in Civil
      • Difference Between Plinth Level, Sill Level, and Lintel Level.
    • Difference Between P to W >>
      • Difference Between Pre-Tensioning and Post-Tensioning
      • Difference Between Short Column and Long Column
      • Difference Between Timber And Wood
  • Excel Sheet
    • How to >>
      • How to Building Construction Process Step by Step
      • How to Calculate Slab Steel Quantity from Drawing | BBS of Slab
      • How to Calculate Staircas
      • How to Excavation Calculation in Excel Sheet
      • How to Find House Construction Cost
    • Building Estimation Step by Step In Excel Sheet
    • Estimation for Building Works
    • House Construction Cost Calculator Excel Sheet
    • House Construction Cost Calculator Excel Sheet For Ground Floor(G.F.), G.F.+1, G.F.+2, G.F.+3,
  • Tools
    • Rate Analysis >>
      • Rate Analysis of Aluminum Door
      • Rate Analysis of Wooden Door
      • Rate Analysis of Brick Work
      • Rate Analysis for Concrete
      • Rate Analysis for Dry Lean Concrete
      • Rate Analysis of Plastering
    • Brick Masonry Calculator
    • Calculator for Cutting Length of Stirrups
    • Concrete Material Calculator
    • House Construction Cost Calculator
    • Plaster Calculator
    • Steel Bar Calculation
    • Trapezoidal Footing Calculato
  • IS Code
    • Is 1200 Important Point Part-1
    • IS Code for Civil Engineer [Q&a]
    • IS 456 Most Important Point Part- 1
    • IS 516:1959 Most Important Point (Method of Tests For Strength of Concrete)
  • हिंदी

Types of Concrete Construction Joints | Tips on Placing Joints in Concrete | Tips on Placing Joints in Concrete

Placing Joints in Concrete

Concrete joints are used to compensate when concrete expands or shrinks with changes in temperature.

Concrete joints are normally used to prevent cracking when concrete contractions, creating training, tools, sawdust, and placement of joint builders.

Pre-planned cracks will provide a finishing product with a better finish and will be formed in specific locations where those cracks can be monitored.

Sometimes, due to the material and the width or extent of the concrete joints, they are necessary to improve the performance of the material and allow the materials to expand/contract or move without damaging other structures.

Also, read: WPC Board | Features of WPC Board | Disadvantages of the WPC board | Usw of WPC

Important Point

  • Types of Concrete Construction Joints:
    • #1. Isolation Joints–
    • #2. Construction Joints–
    • #3. Concrete Contraction Joints–
    • #4. Decorative Concrete Joints –
  • Why Do We Need Placing Joints in Concrete?
    • Tips on Placing Joints in Concrete
    • Tools Use Placing in Concrete 
    • Here Are The Most Used Tools:
    • Concrete Construction Joint
    • What Are the Types of Joints in Concrete?
    • How Do You Build a Construction Joint?

Types of Concrete Construction Joints:

Types of Concrete Construction Joints

Contractors can install different types of joints based on their requirements. A single plate can have different types of joints to make it safer and more resistant.

Here is a brief explanation of all types of joints that contractors can install on their concrete surface:

  • Isolation Joints.
  • Construction Joints.
  • Concrete Contraction Joints.
  • Decorative Concrete Joints.

#1. Isolation Joints–

Isolation Joints-

As the name suggests, this joint exists to insulate the concrete slab from neighboring buildings.

When the concrete slab expands or contracts, the isolation joints will ensure that the slab does not crack or cause problems in the pipes, columns, walls, and columns nearby.

These joints are almost always placed in external installations because the concrete surface does not expand as much indoors and with air conditioning.

Also, read: What Is Admixture | Types of Admixtures

#2. Construction Joints–

Construction Joints-

These joints are placed to keep the new concrete in place. They are essentially table rails made of wood, metal, or plastic and are placed during the pouring and finishing of concrete.

The construction joints will allow you to pour the concrete in stages and control the positioning of the slab according to your needs. You can also use construction joints as contraction joints if you plan placement well.

Also, read: Mortar Vs Cement | Type of Cement | Type of Mortar

#3. Concrete Contraction Joints–

Concrete Contraction Joints-

It intends to create a weakened area in the concrete and regular where the cracks will occur, normally in a straight line.

The contraction joints should be placed to produce panels as square as possible and never exceed a length/width ratio of 1 1/2 to 1. The joints are usually spaced at distances equal to 24 to 30 times the thickness of the slab.

Joint spacing greater than 15 feet requires the use of load transfer devices. Contraction joints can be machined on the concrete surface at the time of laying.

Joints can also be sawn on the hardened concrete surface. It is important to understand that the more the saw is postponed, the greater the potential for cracks to be established before the saw is completed.

Also, read: Mivan Shuttering | Merit & Demerit Mivan Technology | Mivan Formwork Assembly Process

#4. Decorative Concrete Joints –

Decorative Concrete Joints -

Building decorative concrete joints require a little more planning and careful execution. The decorative stamping on the concrete does not sink enough to provide the necessary stability to the slab.

The joint must penetrate at least 1/4 of the surface to ensure that cracks are carefully controlled. You only need to cut the stamped design pattern to ensure that the joints are not visible from the surface.

Also, read: Grillage Foundation | Types of Grillage Foundation | Features of Grillage Foundation

Why Do We Need Placing Joints in Concrete?

Construction joints are used in circumstances where two consecutive concrete layers meet. Construction joints are usually placed at the end of the day or when concrete pouring is interrupted for longer than the initial concrete laying time.

Construction joints must be designed and specified by a structural engineer. You can also join and continue reinforcement through a construction joint.

If sufficient PCC is available at the end of the day, the construction joint can be placed on a planned transverse joint.

Also, read: What Is Granolithic Floors | Construction Method | Advantages аnd Disadvantage

Tips on Placing Joints in Concrete

The following recommended tips should be observed:

  • The maximum spacing of the joint should be 24 to 36 times the thickness of the slab.
  • Joints should be 10 feet apart and a maximum of 15 feet apart.
  • When using the joint groove for contraction joints, the joint must have a minimum depth of 1/4 the thickness of the slab.
  • Saw joints must be made within 4 to 12 hours after finishing the concrete.
  • Keyed joints are not recommended for industrial floors.
  • Dry cutting joints should be made between 1 and 4 hours after finishing.
  • The filling of the precast joint must be used to separate the slabs from the walls or feet of the building. Put 2 inches of sand in motion to prevent attachment to the foot.
  • If the slab contains wire mesh, it is recommended to discontinue it through the contraction joints.
  • The joint spacing must also be chosen so that the concrete sections are approximately
  • It is recommended to have concrete joints along the lines of the column, sawn, or keyed.
  • Metal dowels should be used on slabs that carry heavy loads.
  • Plan the exact locations of all joints, including when to cut the saw.
  • Use Isolation joints between slabs and columns, walls, and sidewalks and where sidewalks or sidewalks meet other concrete structures.
  • The materials used in the concrete joints must be flexible enough to absorb or deform as needed and then be able to restore the original state.
  • Always look for materials that are permeable, and that can adhere to the concrete.

Also, read: What Is DLC (Dry Lean Concrete) | Advantge of DLC (Dry Lean Concrete )

Tools Use Placing in Concrete 

The following tools are typically used to create concrete joints, although these tools may vary depending on the size and scope of the project.

Here Are The Most Used Tools:

  • Manual Grover or Walking Grover:
    • Depending on the size of the slab, it is advisable to choose one of these two.
  • Tools for Wireless Control Joints:
    • Ideal for use in small and medium-sized projects.
  • Concrete Saw:
    • Ideal for cutting saws in concrete, but be sure to know the depth of this. Otherwise, you may be creating other problems.
FAQ

Concrete Construction Joint

Construction joints – are surfaces where two successive placements of concrete meet. They are typically placed at the end of a day’s work but may be required when concrete placement is stopped for longer than the initial setting time of concrete. In slabs they may be designed to permit movement and/or to transfer load.

What Are the Types of Joints in Concrete?

There are three types of joints: Contraction Joints, Construction Joints and Isolation joints. The most common are contraction joints which control cracks which are caused by restrained shrinkage, loads and other stresses. The joint depth should be at least ¼ of the slab thickness.

How Do You Build a Construction Joint?

  1. The surface of the hardened concrete must be clean, rough and free from any deposits. It should have aggregate finish.
  2. The fresh pour must be properly bonded and compacted against the hardened concrete to attain full strength. Anchor bars are usually left projecting to ensure this in case of reinforced concrete work.
  3. The surface finish of the joints must be properly finished to disguise the joint and smoothed. In case of water retaining structures like tanks and basement walls, water stops are introduced at the joints to prevent seepage of water.

Like this post? Share it with your friends!

Suggested Read –

  • BOD Vs COD | What Is BOD | What Is COD
  • Live Load Vs Dead Load | What Is Load in Civil
  • Difference Between One Way Slab and Two Way Slab | What is Slab
  • Vitrified Tiles vs Ceramic Tiles | Whаt Is Vitrified Tiles & Ceramic Tіlеѕ
  • Quality Testing of Sand for Concrete | Quality Testing of Sand for Construction | Type of Sand Test
  • What Is Structural Settlement | Causes For Structural Settlement | What Is Soil Settlement & Foundation Structural Settlement

By Krunal Rajput

About Krunal Rajput

Hey, I am Krunal Rajput. The Man Behind CivilJungle. I started this site to spread knowledge about Civil Engineering. I am a Degree Holder in Civil Engineering.

You can find him on Facebook, Twitter, Tumblr, Instagram and Google News.

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Write for Us and Earn Money

WRITE For US

Popular Post

What Does Parapet Mean | Types of Parapet Wall | Uses of Parapet Wall
What Is a Flight of Stairs | Types of Stairs | How Many Stairs in a Flight | Some Facts About Stairwells
Cinder Block Vs Concrete Block | What Is Cinder Blocks | What Is Concrete Blocks
What Is Shoring In Construction | Type of Shoring
Floating Slab Vs Monolithic Slab | What Is Monolithic Slab | What Is Floating Slab
H-Beam vs I-Beam | What Is H-Beam | What Is I-Beam

MIND BEHIND CIVILJUNGLE

Hey, I am Krunal Rajput. The Man Behind CivilJungle. I started this site to spread knowledge about Civil/Mechanical/Electrical Engineering. I am a Degree Holder in Civil Engineering.

You can find him on Facebook, Twitter, Tumblr, Instagram and Google News.

ADVERTISE

At CivilJungle, we clarify civil engineering and publish all the happenings & news of civil engineering.

Get Traffic & Exposure. We help brands optimize their online presence & performance.

MORE DETAIL

CONNECT WITH US


Privacy Policy | Contact Us | Cookie Policy | Sitemap | Sitemap for Hindi

............................... .............................. .............................

© Copyright 2019-2022 CivilJungle.com | The Content May Not Be Reproduced On Other Websites | Website Maintained By CivilJungle