CRO Module 2 Exam 1 Questions & Answers 2024/2025
Throughout the process, name three key mixes/material that rely heavily on proper fineness/PSD/surface area for proper performance. - ANSWERSKiln Feed, Fuels, Finished Cement
A material with a ____ Bond Work Index is easier to grind. - ANSWE...
Throughout the process, name three key mixes/material that rely heavily on proper
fineness/PSD/surface area for proper performance. - ANSWERSKiln Feed, Fuels, Finished Cement
A material with a ____ Bond Work Index is easier to grind. - ANSWERSLow
A material with a ____ Hardgrove Index is easier to grind. - ANSWERSHigh
A material higher on the Moh's hardness scale is _____ to grind. - ANSWERSHarder
Define grindability of a material. - ANSWERSThe resistance of a material to size reduction.
Grindability is a function of what main properties/characteristics of the material? - ANSWERSchemical
composition (RM & clinker), minerology (hardness & brittleness), crystal size (kiln burning regime)
According to comminution theory laws, work required for size reduction is proportional _______. -
ANSWERSTo the particle size distribution before and after comminution.
Which material(s) are considered some of the typically hardest to grind in the cement industry? (read all
of your choices carefully) - ANSWERSa. Silica (quartz)
b. Clinker
c. Iron Slag
Describe types of clinker that may cause it to be harder to grind downstream, compromising grinding
efficiency and cement strength development. - ANSWERSHard burnt clinker (low LSF or low FL) (brown,
dense clinker), large alite/belite crystals (long BX, slow cooling), high free lime, reducing conditions
(brown, porous clinker)
, Many of the performance properties of cement revolve around what reaction with cement? -
ANSWERSMixing water with cement (cement hydration)
What is water demand for cement? - ANSWERSPercentage of water needed for obtaining normal
consistency
Name a factor that influences water demand. - ANSWERSFineness
Composition
additives
Cement setting is mainly affected by levels of ....? - ANSWERSC3A and SO3
What properties is cement is characterized by (Name 3)? - ANSWERSi. Color
ii. Setting Time
iii. Strength (7-day, 28-day)
iv. Water Demand
v. durability
vi. Expansion
vii. Blaine
viii. Heat of Hydration
Name 2 tests performed in the physical test lab. - ANSWERSCompression strength, slump workability,
autoclave expansion, setting time test, heat of hydration test, color
What kiln operational influences can ultimately impact cement performance? - ANSWERS-Free lime (too
low or too high) via burning conditions
-Alite/Belite Crystal Size via BZ and Cooling Zone length
-Level of SO3 drained with the clinker
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 Bensuda. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
