Term
| Concrete mixing has two functions (2) |
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Definition
1. mixing ingredients
2. agitating already mixed |
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Term
| Stationary mixers should be used in _____ jobs. |
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Definition
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|
Term
| Quality control is difficult with _____ mixers. |
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Definition
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|
Term
| Equipment is dictated by _____. |
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Definition
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Term
| The deposition of concrete should be (3) |
|
Definition
1. continuous
2. near final location
3. uniform in thickness |
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Term
| Each layer should be _____ before adding the next. |
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Definition
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Term
| You should not allow previous layers to _____ before adding the next layer. |
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Definition
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|
Term
| Uniform horizontal layers prevent _____. |
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Definition
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Term
| Finishing involving screeding off excess concrete to bring surface to proper elevation is |
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Definition
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|
Term
| _____ creates a slip resistant surface. |
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Definition
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|
Term
| _____ creates smooth, hard, dense surfaces. |
|
Definition
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|
Term
| _____ embeds aggregate particles just beneath the surface. |
|
Definition
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|
Term
|
Definition
1. design strength
2. freeze/thaw resistance
3. water tightness
4. wear resistance |
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|
Term
| _____ is the continued hydration of cement and requires favorable _____ and _____. |
|
Definition
1. curing
2. moisture
3. temperature |
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|
Term
| Methods of preventing moisture loss (5) |
|
Definition
1. waterproof paper
2. plastic film
3. liquid curing compounds
4. sprinkling
5. wet covering |
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|
Term
| Guidelines for hot weather concreting (3) |
|
Definition
1. < 90*F
2. chilled aggregate
3. shaved ice for mixing water |
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|
Term
| In cold weather concreting, there can be no strength gain below _____. |
|
Definition
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|
Term
| Guidelines for cold weather concreting (3) |
|
Definition
1. heat aggregates & water
2. insulated blankets
3. space heaters |
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Term
|
Definition
1. maintain water during early hardening
2. prevent moisture loss
3. accelerate strength gain |
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Term
| Compressive strength tests are typically done at _____ and ____ days. |
|
Definition
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|
Term
|
Definition
1. shear
2. splitting
3. combo |
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Term
| Estimate tensile strength by (2) |
|
Definition
1. split tensile str
2. flexural tensile str |
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|
Term
| When measuring split tensile strength, there is _____ on the sides and _____ in the middle of the specimen. |
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Definition
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|
Term
| The split tensile strength test tends to overestimate true strength by _____. |
|
Definition
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|
Term
| Modulus of rupture and max load values are only valid if the fracture happens between two _____ loading points. |
|
Definition
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|
Term
| Flexural strength test tends to overestimate tensile strength by about _____. |
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Definition
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|
Term
| The flexural strength test is mainly used for _____ & _____ concrete control. |
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Definition
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|
Term
| In-place tests ("non-destructive") (4) |
|
Definition
1. rebound hammer
2. penetration probe
3. pullouts
4. ultrasound |
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|
Term
| Factors affecting the rebound hammer test (4) |
|
Definition
1. surface smoothness
2. coarse aggregate type
3. moisture
4. concrete age |
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|
Term
| The penetration probe is an _____ measure of concrete hardness. |
|
Definition
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|
Term
| The results of the Danish pullout test can be correlated to _____. |
|
Definition
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|
Term
| The results of an ultrasound test are _____ related to compressive strength. |
|
Definition
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|
Term
|
Definition
1. reduced beam/column size
2. reduces materials cost |
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|
Term
| Cement used in HSC has a high percent (>50%) of |
|
Definition
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|
Term
| In HSC, coarse aggregate optimum size depends on (3) |
|
Definition
1. paste strength
2. cement-aggregate bond
3. aggregate particle strength |
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|
Term
| Smaller coarse aggregate size means _____ strength. |
|
Definition
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|
Term
| Rough, angular coarse aggregate _____ bond strength. |
|
Definition
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|
Term
| The lack of workability from a coarse aggregate can be offset by _____ or _____. |
|
Definition
1. water reducers
2. superplasticizers |
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|
Term
|
Definition
1. higher strength
2. ideal CA |
|
|
Term
|
Definition
1. clean
2. cubical
3. angular
4. 100% crushed
5. minimal flat/elongated particles |
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|
Term
| FA has much greater effect on demand of _____. |
|
Definition
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|
Term
| Natural sands produce _____ strengths manufactured sands. |
|
Definition
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|
Term
| Superplasticizers can reduce water by _____ to _____. |
|
Definition
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|
Term
| Air entrainment is not always needed with HSC because of (2) |
|
Definition
1. tight paste
2. controlled environments |
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|
Term
| Low thermal conductivity results in a _____ rate of heat exchange. |
|
Definition
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|
Term
| Low _____ increases heat of hydration. |
|
Definition
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|
Term
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Definition
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|
Term
| Bond strength _____ with increasing compressive strength. |
|
Definition
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|
Term
| Use _____ to get good workability and even pour. |
|
Definition
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|
Term
| FM for HSC is between _____ and _____. |
|
Definition
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|
Term
| The compressive strength of normal-weight concrete is between _____ and _____ psi. |
|
Definition
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