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How to Cure Portland Cement


Quiz Questions

1.Strength gain in concrete is a time-temperature dependent phenomenon commonly called ________.?
Stiffness
Maturity
Porosity
2. Which of the following is a type of curing compounds?
Resin-solvent based
Chlorinated-rubber based
Wax-water based
All the above
3.________________ is defined in ACI 116R(1) as "change in volume produced by continued hydration of cement, exclusive of effects of applied load and change in either thermal condition or moisture content."
Autonomous volume change
Autogenous volume change
Automatic volume change
4.Which of the following are recognized methods of curing?
Covering with plastic films
Placing wet coverings
Applying curing compounds
All the above
5.USACE guidance is to allow no more than a _________ gradient between the surface and a depth of 50 mm into the concrete (CEGS 03300, paragraph 3.15.6).
8 °C
11 °C
13 °C
18 °C
6.Ultrasonic pulse velocity (UPV) is related to the modulus of elasticity of the concrete.
True
False
7.The _____________ is the time between when concrete is placed and when final curing operations can be initiated.
Initial curing period
Final curing period
Intermediate curing period
8.The rate of evaporation of bleed water is commonly estimated using the ____________.?
ACI 290 nomograph
ACI 301 nomograph
ACI 303 nomograph
ACI 308 nomograph
9.Which of the following is not an ASTM recognized category?
Type I
Type II
Type I/II
Type V
10.Portland-pozzolan mixtures hydrate __________ pure portland cement, and setting times are often extended.
Slower than
Same as
Faster than
11.Concretes with water-cement ratios less than ___________ are known to desiccate internally due to consumption of water during hydration.
0.10
0.20
0.30
0.40
12.In the following equation for Estimated evaporation, what does V represent? where
ER is the estimated evaporation rate (lb/ft2/h),
eo is the vapor pressure of water at the evaporating surface (psi),
ea is the vapor pressure of water is air (psi)
PDH Course - How to Cure Portland Cement
Volume
Velocity
Vapor
13.In the following equation what is K?
PDH Course - How to Cure Portland Cement 1
Kelvin
Spring constant
Activation energy
Residual heat
14.Paving mixtures are typically proportioned with relatively _________ cement contents and relatively low water-cement ratios.
Low
High
15.Which of the following is not a test method for determining efficiency of curing of the near surface zone.?
Rebound Hammer
Water Absorption
Solvent repulsion
Abrasion resistance
16._______________ designed and built a relatively sophisticated test apparatus for measuring shrinkage of fresh concrete and related that property to water losses.
Holt (2000)
Bjontegaard, O.
Stewart, Mark G.
Gowripalan, N.
17.Whether a curing compound application retains sufficient water under a given set of climatic conditions is strongly affected by which of the following properties.?
Impermeability of the material
Amount of application
Temperature
Both A & B
18.Losses of too much water during the final curing period have been shown to negatively impact the quality of the near-surface zone of the concrete, as measured by water absorption and rebound number.
True
False
19.In ________________ technique, a thermocouple in the concrete structure feeds back to a temperature controller on a curing chamber containing standard strength cylinders.
temperature-matched curing
thermocouple curing
precast temperature curing
20.Surface water absorption is a useful tool for measuring the quality of concrete curing.
True
False