WMGT 101 Question and answers already passed 2024/2025
2 views 0 purchase
Course
WMGT
Institution
WMGT
WMGT 101 Question and answers already passed 2024/2025 WMGT 101 - Quiz 5
[CONCRETE FUNDAMENTALS] Describe the constituents of concrete - correct answer -*Portland Cement
-*Aggregate (Coarse larger than #4 sieve + Fine between #4 and #200. Anything below is considered deleterious)
-*Water
...
WMGT 101 - Quiz 5
[CONCRETE FUNDAMENTALS] Describe the constituents of concrete -
correct answer ✔-*Portland Cement
-*Aggregate (Coarse larger than #4 sieve + Fine between #4 and #200.
Anything below is considered deleterious)
-*Water
-Chemical Admixtures
-Supplementary Cementitious Materials
*The Big Three Ingredients
[CONCRETE FUNDAMENTALS]
Explain the goals of concrete mix design and how each constituent property
and quantity contributes to the ideal mix design - correct answer ✔In
concrete mix design you can cater your concrete to your specific location's
and application's needs by altering the percentages of each component and
mixing in additional ingredients.
Mix proportions: Material % By Volume
Cement 10-15%
Aggregate 60-75%
Water 15-20%
Air 5-8%
Paste = Cement + Water
Mortar = Paste + Sand
Water/Cement ratio is critical
,Type 1 - Normal
Type 2 - Moderate sulfate resistance
Type 3 - High Early Strength
Type 4 - Low heat of hydration
Type 5 - High sulfate resistance
[CONCRETE FUNDAMENTALS]
Describe the benefits and drawbacks of the following admixtures: air
entrainers, water reducers / superplasticizers, retarders, and accelerators. -
correct answer ✔Air Entrainers: Create air bubble structures within the
concrete to allow for freeze / thaw cycles preventing cracking or spalling.
Water reducers / superplasticizers: Aid in workability and pumping operations
Retarders: Used in hot climates during pour / hydration to slow down the
curing process.
Accelerators: Used to speed up the curing process, for use in cold climates
and schedule constraints.
[CONCRETE FUNDAMENTALS]
Describe when tests are performed in the design and construction process. -
correct answer ✔Samples taken for Laboratory compressive strength tests
and 3rd pt. flexural strength tests. Field quality control done through slump
tests. In-place non destructive tests include dynamic resonance and rebound
hammers.
[CONCRETE FUNDAMENTALS]
Explain the difference between flexural and compressive strength - correct
answer ✔Flexural strength is the ability to resist both compressive and tensile
stresses, generally for a beam or column with slenderness. Compressive
strengths are observed on the top half of flexural beams and for columns that
well above the slenderness ratio to be considered.
, [CONCRETE FUNDAMENTALS]
Describe the properties of reinforcement and why it is installed in concrete -
correct answer ✔Concrete is inherently weak in tension. Steel reinforcement
has high tensile strength and thus is added to concrete to improve this quality.
[CONCRETE FUNDAMENTALS]
Explain how development calculations are influenced by other material and
geometric properties of the concrete member being reinforced and
reinforcement type selected - correct answer ✔Development length is the
minimum embedment of reinforcement for strength. No greater than 0.75x
clear space between rebar
No greater than 0.33x member
[CONCRETE FUNDAMENTALS]
Describe where in the a concrete foundation we install reinforcement - correct
answer ✔Tension zone is the lower 1/3 portion of a beam. For shear, stirrups
are installed at a designated interval. Top bars are generally installed to hold
the stirrups in place during construction.
[CONCRETE FUNDAMENTALS]
Describe how unreinforced concrete member reacts to loading - correct
answer ✔It resists stresses almost linearly with comparison to the increased
loading until the tension strength is exceeded, which will induce catastrophic
failure.
[CONCRETE FUNDAMENTALS]
Explain how adding reinforcement changes the interactions within the
concrete - correct answer ✔Adding reinforcement in the tension zones of
concrete that become cast as one with the members improves the resistance
to tension stresses.
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 EFT, 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 this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller flyhigher329. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R240,00. You're not tied to anything after your purchase.
