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Reinforced & Prestressed Concrete for Construction Managers

Increase your value as a construction manager by gaining vital knowledge about concrete reinforcing and prestressing.
Instructor:
Jim Rogers
810 students enrolled
English [Auto-generated]
Explain the meaning of passive reinforcing versus active reinforcing
List examples of active and passive reinforcing
Discuss the effects of adding rebar to concrete
Explain how the change in location of the rebar within the concrete effects its performance
List advantages of prestressed concrete
Describe the difference between pre-tensioned and post-tensioned reinforcing
Describe the precast concrete process
Explain how post-tensioned concrete works
List common examples of prestressed concrete structures

Concrete is the most widely used building material in the world. In addition to understanding concrete, today's construction professional needs to understand the principles of concrete reinforcing and how prestressed concrete works. This includes both pre-tensioned concrete that is typically manufactured in a precast plant, and post-tensioned concrete that is cast-in-place. Post-tensioned concrete is being used more and more throughout the world to build multi-story structures, slabs-on-ground, and bridges, while precast prestressed concrete continues to be used in rapidly built structures like parking garages. Understanding how and why reinforcing and prestressing works in a concrete structure.

Gain a better understanding of the principle and theory behind concrete reinforcing and prestressing to help you be a better construction management professional.

After completing this course you will be able to…

  • Explain the meaning of passive reinforcing versus active reinforcing and list examples of each
  • Discuss the effects of adding rebar to a concrete element
  • Explain how the change in location of the rebar within the concrete effects its performance
  • List advantages of prestressed concrete
  • Describe the difference between pre-tensioned and post-tensioned reinforcing
  • Describe the precast concrete process
  • Explain how post-tensioned concrete works
  • List common examples of prestressed concrete structures

Learn from a professional

My courses have been created as a place where everyone, whether you are an experienced professional, a young project engineer, new to a trade or a seasoned journeyman, can come to learn more about the industry that we have chosen as our profession. That's what this platform is about. These courses are meant to be a way for you to increase your knowledge of the construction industry in a variety of cutting edge topics from concrete reinforcing and prestressing, to micro trenching, to safety management systems. This is not a course that teaches you how to install rebar or prestressing steel. It is a course that educates you on why we reinforce concrete and how it works. This is information you need as a construction professional in order to talk to designers, owners and subcontractors.

This course is a great way for you to increase your knowledge about concrete reinforcing and prestressing.

Introduction

1
Introduction

So you know a little but about concrete. Maybe you even took our Understanding Concrete course here on Udemy? But do you really understand the strengths and weaknesses of concrete? Do you understand how and why it cracks?

2
How much do you already know?

This brief quiz will test you on how much you already know about reinforcing and prestressing, and will set the stage for some of the things we will discuss in the following lectures.

3
Getting the Most from this Course

In this section we will introduce the concepts that will be covered in this course. The idea is to get you thinking about the concepts and the learning objectives. Also included are the first handouts that are included with this course. Make sure to check them out and get them downloaded! This supplemental material makes a great set of resources to take away from this class. Access it by clicking on the RESOURCES tab at the top of each lecture.

4
Course Goals and Objectives

Learning objectives are concise, measurable outcomes. These are the things you should be able to do after completing this course:

  • Explain the meaning of passive reinforcing versus active reinforcing
  • List examples of active and passive reinforcing
  • Discuss the effects of adding rebar to concrete
  • Explain how the change in location of the rebar within the concrete effects its performance
  • List advantages of prestressed concrete
  • Describe the difference between pre-tensioned and post-tensioned reinforcing
  • Describe the precast concrete process
  • Explain how post-tensioned concrete works
  • List common examples of prestressed concrete structures
5
Reference Material

This lecture contains the vocuabulary refernece material for the course and discusses safety considerations.

An Introduction to Concrete as a Building Material

1
The Basics

Concrete is the most widely used building material on the planet! Learn why here.

2
What is Concrete?

This section gives a brief introduction and overview of concrete; what's in it and how it works. This section introduces the chemical reaction known as "hydration" which is the chemical reaction between cement and water that results in the concrete getting hard. We also introduce the concept of using industrial by-products as a partial replacement for cement. Download the PDF file in the Resources tab to learn more about one of the most common by-products used in concrete.

Want a more in depth look at concrete? Check out our course here on Udemy titled "Become a Better Construction Manager - Learn About Concrete".

Stresses Effecting Concrete - Compression, Tension and Shear

1
Compression versus Tension

Concrete is strong in compression and weak in tension. Compression is the force that squeezes something together and tension is the force that pulls it apart.

2
What Causes Cracking?

This section looks at the forces and stresses that cause concrete to crack. Both tension and shear are discussed.

Passive Concrete Reinforcing

1
Managing Cracking

We use different techniques, including control joints and passive reinforcing like rebar and wire mesh to control cracking. These methods will not stop concrete from cracking, but if utilized correctly they will control the cracking, limit the crack widths, and prevent cracking from leading to failure.

2
Passive Concrete Reinforcing

This final lecture on passive reinforcing pulls together the concepts learned so far, and explains the reasoning behind the use of the term "passive" reinforcing.

3
Check Your Knowledge #1

Take this short quiz to see what you have learned so far!

Active Concrete Reinforcing

1
Active Reinforcing

Prestressed concrete is actively reinforced. This means that we are applying forces to the concrete before we place it in service in order to enhance its performance.

2
Advantages of Prestressing

Increasing the tensile capacity of the concrete member results in several advantages including longer spans, shallower members and better crack control. All of these things combine to result in economic advantages and savings in concrete.

Be sure to check out the handout material in the Resources tab for a paper published by the Post-Tensioning Institute about the sustainability benefits of prestressed post-tensioned concrete,

3
Putting It All Together

Active and Passive reinforcing are often used together to create a concrete structure that is economical and meets the performance requirements.

4
Examples of Prestressed Concrete Srtuctures

Today, the use of prestressing is common in concrete structures due to its economic advantages. Hotels, office buildings, bridges, parking structures and even residential foundations are all common uses for prestressed concrete.

The White Paper included in the Resources tab introduces the concept of prestressed concrete to build "high performance" structures.

5
Layout and Stressing

Layout is determined by the designer, with proper placement being critical to the performance of the structure.

6
Prestressing Safety

Prestressing steel is tensioned to a very high force (33,000 pounds or more). Safety is extremely important. Personnel who are not a part of the stressing operation should not be permitted in the area. Personel working on the stressing operation need to be properly trained.

7
Check Your Knowledge #2

Let's see how much you learned about prestressed concrete!

Strengths of Materials

1
Summary of Uses

We use some form of passive reinforcing in virtually all types of concrete structures; any time we expect tensile stresses to exceed the strength of the concrete. We add active reinforcing to further enhance the properties and the performance of some concrete structures when we want longer spans, thinner concrete sections and stiffer beams and slabs.

2
Strengths, Advantages and Limitations

This lecture sumarizes the strenghts of the various materials discussed in this course and wraps up the discussion on the advantages and limitations of prestressed concrete.

Conclusions

1
Check Your Knowledge #3

Take this final quiz to check your knowledge against the learning objectives listed at the begining of this course.

2
Summary and Conclusion

Thank you for completing this course. You should now have a good understanding of why we reinforce concrete and of the benefits of prestressed concrete. You should understand why a designer might make the decision to utilize prestressed concrete and what the differences are between precast, pre-stressed, concrete and cast-in-place, post-tensioned concrete.

If you enjoyed this course, please consider leaving a positive review! If you have questions, make sure to post them in the discussion board for this course. I check for questions everyday; or you can use the message feature to send me a note or question.

Thanks, and be sure to look for our other courses. Additional topics are added each month.

You can view and review the lecture materials indefinitely, like an on-demand channel.
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