Exam (elaborations)
CIM 3420 Midterm questions and answers verified 2024
- Course
- Institution
CIM 3420 Midterm questions and answers verified 2024
[Show more]
Content preview
CIM 3420 MidtermLime Concrete - correct answer ✔The process of "calcination" (Lime
Cycle)converting calcium carbonate (CaCO3) to quicklime(CaO) releasing
CO2during the process! àFollowed by hydration of the lime (hydrated lime)
and its (slow) conversion back to calcium carbonate from its reaction with
CO2in the atmosphere
Gypsum cement - correct answer ✔Similar process to calcination of
limestone except with the use of gypsum.
C-S-H - correct answer ✔Calcium Silicate Hydrate
Quicklime + Sand + Volcanic ash forms it.
known as the "Glue"
Strength of the Concrete
Ancient Greece and Rome Cements(1000-500 BCE) - correct answer ✔one
of the first to use sand in combination with quicklime àLime mortar (quicklime
+ Water + sand + volcanic ash)
Romans - correct answer ✔pioneers of the Lime-pozzolan mortar(500-0CE)!
hydraulic cement - correct answer ✔A binder that is capable of reacting with
water and stays stable under water. Continues to react withadditional
waterexposure
,Non-Hydraulic Cement - correct answer ✔Will dissolve if exposed to
moisture
Example:Gypsum cement (gypsum board) will dissolve upon exposure to
water
John Smeaton (1759) - correct answer ✔Experimented with different
limestones and Figured out that the best results were the impure, clayey
limestones. In other words, the
availability of other favorable minerals (Ca, Si, Al, etc.) resulted in better
hydraulic properties §Resulted in a hydraulic lime that Had cementitious
properties C-S-H and CH were produced à"All-In-One" product
Joseph Aspdin (1824) - correct answer ✔Patents process for making first
portland cementàHowever, no "clinkering" in this process
In other words, was not using high enough temperature to get better reactivity
from cement (No Alite C3S crystals!!) àProduct was not too different than the
Romans however, clayey limestones were used and produced a decent
quality cement
William Aspdin (1843) - correct answer ✔Improved the process of portland
cement by:
Burning at higher temps
Grinding the material down. finer material= more reactivity!!!
High lime (CaO) content
, Isaac Johnson - correct answer ✔determines the optimum proportions of
limestone and clay for portland cement which is what we base off most of
cement chemistry today!
Why is concrete used at such a large scale? - correct answer ✔Excellent
water resistance. Compared to ordinary steel or wood
Ease of formation. Can be shaped into almost any desired configuration
Low Cost. Usually made from local materials which keeps costs quite low
Cement vs. Concrete - correct answer ✔Cement is the powder that binds the
materials!!
Concrete = Cement + Rock + Sand + Water!! (End product)
Mortar - correct answer ✔= Cement + Sand + Water
Paste - correct answer ✔= Cement + Water
LISA - correct answer ✔Lime
Iron
Silica
Alumina
Raw materials required to produce cement.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LEWISSHAWN55. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67163 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now