The following paper analyzes the causes of cracks in concrete masonry infill wall with frame-structure from temperature fluctuation,the change of water content,construction quality,and the quality of construction material,and proposes related preventive measures,in order to improve crack-resistant ability of infill wall and guarantee structural integrity.

Fromtemperature,shrinkage,the corrosion of reinforcingsteel,construction materials and other aspects the reasons causedthe con-crete cracks producedin construction process are analyzed;at the same ti me corresponding prevention and treatment measures are introducedfromraw material control and construction technologyin order toi mprove engineering quality and reduce loss.

The paper analyses the current delay elements and technology for physical protection of nuclear facilities and materials, presents the improvement method and development trend of delay technology.