Characteristics and weathering mechanisms of the traditional Chinese blue brick from the ancient city of Ping Yao

Salt crystallization and freeze–thaw cycles are identified as the primary factors contributing to the weathering of traditional Chinese blue bricks, particularly in damp areas of the UNESCO-listed Ancient City of Ping Yao. This study analyzed brick samples from historical buildings, assessing their mineralogical and physico-mechanical properties—such as density, porosity, water absorption, and compressive strength—as well as their resistance to salt crystallization and frost. Laboratory experiments revealed that these environmental stresses degrade brick integrity through mechanisms like contour scaling, flaking, powdering, and efflorescence formation. The research proposes an anti-weathering strategy combining damp blocking, desalination, and targeted brick replacement, offering practical solutions for preserving this heritage site while addressing broader challenges in conserving traditional Chinese architecture.

Liu, J.-b., & Zhang, Z.-j. (2020). Characteristics and weathering mechanisms of the traditional Chinese blue brick from the ancient city of Ping Yao. Royal Society Open Science, 7(8), 200058. https://doi.org/10.1098/rsos.200058