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Introducing
The subject of my presentation
What I am going to talk about today is
Id like to give you a brief overview of
The reason Im here today is to talk about
Structuring
Ive divided my talk into(three/four) main sections
My presentation will be in three parts
First of all, firstly, secondly, thirdly, then, after that, lastly, finally
Referring to visuals
As you can see from the table/graph
Moving on to a new point
Turning now to
What Id like to talk about now is
Now I would like to describe
Now lets move to the next point which is.
Summarizing and concluding
To sum up
To recapitulate what Ive been saying
So, to go over the main points again
Id like to conclude by saying
Ending a presentation
Thank you for listening to me
If there are any questions, Ill be pleased to answer them
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Good afternoon, everybody.
Let me introduce myself. My name is... I am a first year postgraduate student, specializing in highway engineering.
The subject of my presentation is Selection of concrete materials for road pavement construction.
This topic is particularly relevant because concrete materials play the main part in ensuring durability of road pavement.
Ive divided my talk into three main sections.
First of all, I am going to give a brief overview of concrete as a construction material.
Secondly, Ill comment on supplementary cementitious materials.
And finally, Ill speak about the compatibility of these materials.
To begin with
Concrete in its most simple form consists of cement, water and aggregates. In modern practice concrete is often used in pavement construction.
It is common knowledge that the main part of concrete is cement. And cement is the hydraulic glue that holds concrete together. It is the cement that provides durability of pavement.
However, we need to use supplementary cementitious materials to upgrade the quality of pavement. These materials also reduce the cost and improve the performance.
Lets move to the next point which is the supplementary cementitious materials and consider them in detail.
These materials are mineral admixtures, including fly ash, slag, and silica fume. Typically, they retard early strength gain of concrete, but improve the ultimate strength and durability. Supplementary cementitious materials may have pozzolonic properties. The pozzolonic decrease porosity of hardened cement paste and concrete and increases freeze-thaw resistance.
And now, its time to draw your attention to the main part of my presentation that is the compatibility of these materials.
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Nowadays, we have an enormous amount of admixtures. So, it is very important to know about their compatibility. For example, admixtures may alter effectiveness of air-entraining admixtures such as fly ash or mineral admixtures.
Otherwise, our highways will quickly deteriorate and that can lead to an accident. Correct selection of the concrete materials is responsible for road safety.
To sum up, Id like to say that the selection of concrete materials is not an easy task. You should have extensive knowledge in the field of road construction to carry it out.
Thank you for your attention. If there are any questions Ill be pleased to answer them.
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