Mineral admixture refers to the minerals that have a puzzle Lanark property that are added to either
improve the properties of concrete or to replace a portion of the more expensive Portland cement and
this is why they are also often called cement extenders
puzzle learning materials are salacious or aluminum as materials that react with water in hydration
process these materials will react with the calcium hydroxide that results from the initial hydration
process.
Remember the calcium hydroxide was the other chemical released along with CSA H at the moment only the
CSA was providing a meaningful strength gain.
But now if poser learning materials are introduced they will react with this extra compound to create
even more segmentation material.
This has two main effects on the concrete.
The extra segmentation material increases the strength of the concrete with less pure cement as well
as using up more of the calcium hydroxide resulting in a more dense and therefore more durable concrete
okay.
So that's a positive learning material but how do we get our hands on them.
And when are they added.
Well there are loads of mineral admixture is being tested but we'll focus on the big three here.
For now ground granulated blast furnace slag silica fume and fly ash all of which are regularly used
in concrete ground granulated blast furnace slag or GJ UBS is the byproduct of the structural steel
world that mainly consists of aluminum and silica if this byproduct is cooled slowly then it's of no
use to us.
But if cooled rapidly it takes on a crystalline structure and becomes reactive it is added as another
flexing agent fly ash or F.A. is a byproduct of coal burning the flu gases are filtered and sorted into
fine and coarse materials and the fine materials are what are used as the mineral admixture.
We have condensed silica fume or CSF is again a product of the steel industry.
But this time from the smelting process this very fine material is a condensed vapor from this process
which is really difficult to handle and transport.
To combat this electrostatic forces are used to help condense and make it more user friendly and transport
friendly.
Okay so your assignment for this lecture is to define the hydration process in your own words.
You can either use google to check your answer or posted to the Facebook group where we can work through
it together.