Study Of The Application Of Standardized Steel Spacers For Construction Quality Control Of Cover Layers

With the rapid development of the national economy after the reform and opening up, the scale of construction has been increasing year after year. Various structure forms are emerging. And reinforced concrete structure is the most widely used in engineering and relatively mature in technology. In recent years the study of the durability of reinforced concrete in engineering has been very hot. And the quality of reinforced concrete spacers is one of the factors which directly affect the durability of the structure. However, little importance has been attached to the quality of reinforced concrete spacers, and traditional techniques can't assure the quality of spacers. This thesis analyzes the construction quality of spacers in reinforced concrete, verifies the application and advancement of the steel spacers combined with experiment and engineering practice, and explores a new way to control the quality of standardized spacers.I have collected a large number of documents, made investigations on the spot, and practiced in building sites to write the paper. This paper compares the differences between domestic and foreign codes in the spacers of reinforced concrete, analyzing various means of quality control in spacers. Meanwhile a new model of steel spacers is presented to make sure the quality control.Experiments of steel spacers have been made including bearing test of concrete slab, performance test of construction joint, bearing test of high support spacers . Results reveal that bearing performance, practicability of concrete slab , when using new style steel spacers , are better than those using traditional spacers.Combined with pilot project the author instructed, this paper applies the experimental results into practice and, further proved new style steel spacers have significant effect on quality control of cover layers through solid inspection and sense evaluation.Meanwhile, this paper compares new style spacers with traditional spacers, such as mortar spacers and plastic spacers. It is found that using new style spacers does not result in much higher expense, however, construction speed and quality control are significantly improved. Investors are willing to accept new style spacer since it does not result in higher expense while bring in good economic and social benefits.Finally, this paper deals with the necessity and feasibility of reinforced concrete spacers and gives some advice of standardization of concrete spacers.