SEC Flashcards
It is a kind of test that determines the consistency of concrete
Slump Test
This should be done during the first seven days in order that the expected development of strength will be obtained and the occurrence of plastic cracks will be prevented or minimized.
It is a construction operation that concrete should be protected so that moisture is not lost during the early stages of hardening, and it should be kept at a temperature that will promote hydration and also protect against injury from subsequent construction activities.
Curing
A general term relating to the character of a mix with respect to its fluidity
Consistency
Material other than the basic ingredient of concrete mix immediately before or during mixing to modify one or more of the specific properties of concrete in the fresh hardened states
Admixture
It is an impervious membrane applied to concrete pavement before its initial setting that prevents rapid evaporation of water from the mix
Curing Compound
A mixture of cementitious materials and water, with or without aggregate, proportioned to produce a creamy consistency
Grout
It refers to how easily freshly mixed concrete can be placed, consolidated and finished with minimal loss of homogeneity
Workability
Occurs as concrete hardens, being greater in wet mixes. Curing helps to limit effects and therefore concrete in the actual structure should be thoroughly and continuously moistened for some considerable period after placing.
Shrinkage
Ratio of the lateral strain to the longitudinal strain.
Poisson’s Ratio
The constant of proportionality in the linear portion of the stress-strain diagram
Mod. of Elasticity (Young’s Modulus)
The area under the entire stress-strain curve
Toughness Modulus
The limit beyond which the material will no longer go back to its original shape when the load is removed
Greatest stress that can be applied to an elastic body without causing permanent deformation.
Elastic Limit
Stress point where a material will have appreciable deformation when small amount of stress is experienced
Yielding
The point in the stress-strain test at which the material will have an appreciable elongation without any increase of load.
Yield Point
the ability of a material to absorb energy in the ELASTIC range (without permanent deformation)
Resilience
the ability of a material to absorb energy in the PLASTIC range
Toughness
the ability of a material to deform in the ELASTIC range without breaking
Elasticity
the ability of a material to deform in the PLASTIC range without breaking
Plasticity
When a material has to support a load for a long period of time, what causes it to continue to deform until a sudden fracture occurs?
Creep
A measurement of the resistance of a material to deformation, indentation, or scratching, and can be used to verify the ultimate strength of structural steels after heat treatment
Hardness
Ability of a material to undergo plastic deformation without failure under high tensile stresses
Ductility
Reciprocal of stiffness
Flexibility (of a struc)
Reciprocal of deflection
Rigidity
the point through which the resultant of the resistance to the applied lateral force acts
Center of Rigidity
the point on a structure where the resultant vertical load acts
Center of Gravity
The point on a structure through which the applied seismic force acts
Center of Mass
Develops when the center of mass and center of rigidity of a structure does not coincide
Torsional Shear Stress
the distance between the center of rigidity and the center of gravity
Eccentricity
the properties of the material are the same for every direction
Isotropic
the properties of the material are different for different directions
Orthotropic
Sudden drop of shear strength
Liquefaction
A building which has a floor which is less than 70% as stiff as the floor immediately above it, or less than 80% as stiff as the average stiffness of the three floors above it
Soft Storey
Refers to the lateral displacement of one level relative to the other level above or below
Storey Drift
What can be measured by a seismometer?
Ground Displacement
If two springs with stiffness k1 and k2 are arranged in parallel, which of the following gives the combined stiffness k?
k = k1 + k2
Occurs when a building period coincides with the earthquake period
Resonance
Besides the epicentre, it describes the location of the earthquake
Focal Depth
Measured by the Richter scale
Magnitude of Earthquake
