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Concrete joints

What type of joint consists of a premolded joint filler separating two separate concrete pours, allowing the two sections to move independently and relieve flexural stresses that develop at T- or unsymmetrical intersections? Typical use includes separating slabs from foundations walls or columns.
A. Control joint
B. Construction joint
C. Expansion joint
D. Isolation joint

Answer"D. Isolation joint. Typ. 1/2 - 1 in max width. Alternatively, expansion joints relieve stress due to confinement of a slab, allowing the slab to expand without damaging adjacent structures or the slab itself.

ARE 4.0 exam prep: BDCS

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