Core TradesCâu 72 / 700
A driveway slab cracks in a fairly straight line directly over a buried utility trench that was backfilled. The MOST likely cause is:
a.Too much cement in the mix
b.Excessive air entrainment
c.Differential settlement of poorly compacted trench backfill under the slab
d.Curing the slab too long
Giải thích
A crack tracking a backfilled trench indicates the subgrade settled unevenly because the trench backfill was not compacted to match the surrounding soil, leaving the slab unsupported over the trench. Cement content, air entrainment, and extended curing do not create a crack that follows a trench line.
Trích dẫn luật: 2025 CA Building Code, Chapter 19 (Concrete)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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