Construction Materials & Methods Flashcards
7 cards from real CCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Construction Materials & Methods flashcards as text
What is the required minimum lap splice length for No. 6 Grade 60 deformed bars in tension, expressed in terms of bar development length (ld)?
Answer: 1.3 ld
ACI 318 requires Class B tension lap splices (most common) to be 1.3 times the development length (ld) of the bar being spliced.
Which ASTM standard specifies the requirements for structural bolts commonly used in steel construction (A325 equivalent)?
Answer: ASTM F3125 Grade A325
ASTM F3125 consolidated previously separate bolt standards; Grade A325 within F3125 covers medium-strength structural bolts for steel-to-steel connections.
In masonry construction, what is the purpose of 'collar joints'?
Answer: Vertical longitudinal joints between wythes of masonry filled with mortar or grout
Collar joints are vertical joints between adjacent wythes of a multi-wythe masonry wall, typically filled with mortar or grout to bond the wythes together.
What is 'honeycombing' in concrete, and what is its most common cause?
Answer: Voids in hardened concrete where mortar failed to fill aggregate spaces; caused by inadequate consolidation
Honeycombing refers to voids or porous areas in hardened concrete where mortar did not fill the spaces around coarse aggregate, typically due to insufficient vibration during placement.
When inspecting asphalt paving, 'rutting' is defined as:
Answer: Permanent surface deformation forming longitudinal channels in wheel paths
Rutting is a form of permanent deformation in asphalt pavement characterized by longitudinal depressions in the wheel paths, caused by instability or insufficient compaction.
Which standard specifies the test method for field determination of soil compaction using a nuclear density gauge?
Answer: ASTM D6938
ASTM D6938 covers the use of nuclear methods (moisture-density gauges) for the in-place determination of density and moisture content of soil and soil-aggregate mixtures.
What is the purpose of 'minimum bending radius' requirements for reinforcing steel bars?
Answer: To prevent cracking or breaking of the bar during bending and maintain bond strength
Minimum bend radii prevent the steel from cracking or kinking during fabrication and ensure adequate concrete bearing area at the bend to develop the bar's full capacity.