Term
| PCC has less than what percent air? |
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Definition
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Term
| Favorable concrete characteristics (3) |
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Definition
1. material availability
2. form shaping
3. easily modified properties |
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Term
| Properties of PCC that are favorable to be modified are (5) |
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Definition
1. strength
2. durability
3. economy
4. water tightness
5. abrasion resistance |
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Term
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Definition
1. asphalt/organic
2. Portland/inorganic |
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Term
| Portland cement types (2) |
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Definition
1. non-hydraulic
2. hydraulic |
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Term
| Raw materials needed for PC (4) |
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Definition
1. lime
2. silica
3. alumina
4. iron oxide |
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Term
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Definition
1. crush to small size
2. grind into powder
3. clinker in rotary kiln
4. final grinding |
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Term
| The point of incipient fusion or "clinkering temperature" is about |
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Definition
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Term
| Bulk distribution of cement is done by (4) |
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Definition
1. rail
2. barge
3. truck
4. bags |
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Term
| 1 bag of cement is (weight) |
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Definition
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Term
| Tricalcium silicate's abbreviation is |
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Definition
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Term
| Dicalcium silicate's abbreviate is |
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Definition
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Term
| Tricalcium aluminate's abbreviation is |
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Definition
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Term
| Tetracalcium aluminoferrite's abbreviation is |
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Definition
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Term
| C3S hardens _____ and is responsible for _____ set. |
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Definition
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Term
| C2S hardens _____ and is responsible for strength beyond _____. |
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Definition
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Term
| C3A is responsible for strength in the _____ and is reactive with _____. |
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Definition
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Term
| With PC it is desirable to have _____ heat generation, _____ strength, and resistant to _____ attack. |
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Definition
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Term
| C4AFe makes a lower _____, hydrates _____, and does not impact _____. |
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Definition
1. clinkering temperature
2. rapidly
3. strength |
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Term
| Type I concrete is not resistant to _____. |
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Definition
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Term
| Type II concrete has _____ sulfate resistance, _____ heat of hydration, and used in _____. |
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Definition
1. moderate
2. low
3. mass pours |
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Term
| Type III concrete has a high early _____, so it is good in _____ weather concreting. |
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Definition
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Term
| Type IV concrete has _____ strength gain, and is used in _____ mass pours. |
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Definition
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Term
| Type V should be used in high _____ concentrated water or soil. |
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Definition
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Term
| Finer grinding leads to _____ rate of strength gain. |
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Definition
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Term
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Definition
1. exhibit cracking
2. disintegrate material mass |
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Term
| The ability of a freshly mixed paste to flow is known as |
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Definition
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Term
| Setting time is regulated by (4) |
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Definition
1. gypsum
2. fineness
3. W/C ratio
4. admixtures |
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Term
| False set can be fixed by |
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Definition
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Term
| Cement strength does NOT accurately predict |
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Definition
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Term
| Heat of hydration is primarily controlled by (2) |
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Definition
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Term
| Rough texture or flat/elongated particles will reduce _____. |
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Definition
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Term
| Freeze-thaw resistance is affected by (3) |
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Definition
1. porosity
2. absorption
3. pore structure |
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Term
| 0.03 to 0.15% sugar can be a set |
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Definition
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Term
| 20 to 25% sugar can be a set |
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Definition
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Term
| Desirable aggregate characteristics (6) |
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Definition
1. clean
2. hard
3. strong
4. durable
5. chem free
5. clay coat free |
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Term
| For fine aggregate want FM between _____ and _____. |
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Definition
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Term
| FM is equal to _____ divided by 100. |
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Definition
| sum of cumulative % retained |
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Term
| Cumulative % retained equals 100 minus _____. |
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Definition
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Term
| The critical parameter to measure in production is _____. |
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Definition
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Term
| _____ sands are unworkable, while _____ sands are uneconomical. |
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Definition
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Term
| Admixtures are used to (7) |
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Definition
1. improve workability
2. reduce W/C
3. increase durability
4. retard setting
5. change color
6. maintain volume
7. resist freeze-thaw |
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Term
| With a reduced W/C comes increased _____. |
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Definition
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Term
|
Definition
1. air entrainers
2. water reducers
3. retarders
4. accelerators
5. superplasticizers
6. Pozzolans |
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Term
| Air entrainment is often used in (2) |
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Definition
1. severe freeze-thaw
2. interconnected void systems |
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Term
| Water reducers that act like "Pam for concrete" are |
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Definition
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Term
| Retarders are used in ____ weather projects. |
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Definition
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Term
| The most common accelerant is |
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Definition
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Term
| Accelerants are not recommended with (5) |
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Definition
1. reinforced steel (corrosion)
2. steel/aluminum in humid environments (corrosion)
3. alkali-aggregate reaction potential
4. hot weather
5. mass pours |
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Term
| Pozzolans are by-products of _____ and _____. |
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Definition
1. thermal power plants
2. metallurgical furnaces |
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Term
| The 3 E's to consider with admixtures |
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Definition
1. Engineering
2. Economics
3. Ecology |
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Term
| Pozzolans generally _____ the need for air entrainment. |
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Definition
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Term
| Fly ash needs to be tested before use because small, round particles _____ water demand, while high carbon content _____ water demand. |
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Definition
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Term
| Natural pozzolans _____ water demand. |
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Definition
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Term
| Silica fume _____ water demand. |
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Definition
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Term
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Definition
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