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Which risk increases when poorly mixed mortar is used in arched Roman masonry?

A)Excessive lateral thrust
B)Catastrophic shear failure
C)Increased material creep rate
D)Reduced capillary wicking rate

💡 Explanation

Excessive lateral thrust occurs when structural integrity fails because the cohesive strength of the mortar is compromised, creating outward pressure. This insufficient tension causes collapse, therefore the arch thrusts outward rather than being maintained by compression.

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