Construction of SIMCON Retrofitted Reinforced Concrete Columns

strengthening;salt scaling resistance;freeze and thaw;durability;fiber reinforced concrete;cost;retrofit;tolerances;column design;constructibility

Coskun, Hilmi ; Dr. Michael L. Leming, Committee Chair,Coskun, Hilmi ; Dr. Michael L. Leming ; Committee Chair

University:North Carolina State University

关键词: strengthening;    salt scaling resistance;    freeze and thaw;    durability;    fiber reinforced concrete;    cost;    retrofit;    tolerances;    column design;    constructibility;   

Others  :  https://repository.lib.ncsu.edu/bitstream/handle/1840.16/5298/etd.pdf?sequence=2&isAllowed=y

美国|英语

来源: null

【 摘 要 】

There is a growing interest on infrastructure retrofitting due to updated seismic codes and increased service loads.There may be some economical reasons or preservation needs to strengthen a structure instead of demolishing it.For strengthening purposes alternatives include steel jacketing and Fiber Reinforced Plastic (FRP) wrapping.This study focuses on Slurry Infiltrated Mat Concrete (SIMCON) as an option for strengthening of reinforced concrete columns.Before SIMCON is applied routinely for strengthening of a column, however, certain critical construction and constructibility factors affecting the jacketed column behavior must be resolved.In this study, the frost durability of SIMCON was examined, factors associated with the construction of a SIMCON jacket were identified, the influence of these factors on service load and ultimate state behavior were evaluated, the criticality of these factors was determined, and general guidelines for the construction or design of SIMCON jackets on existing columns were developed.In addition, an approximate cost of SIMCON jackets for existing reinforced concrete columns was developed in order to evaluate the economic viability of the SIMCON jacket.SIMCON exhibited satisfactory deicer salt scaling resistance, even without the presence of entrained air.No significant effect of cracking on scaling was observed.Several construction aspects of jacketing were studied analytically.Bonding was not found to be necessary for SIMCON jacketing of a column.The most important factor is the end connections of a SIMCON jacket for load and moment transfer.Other critical factors were thickness and strength tolerances of SIMCON jacket.The construction costs of SIMCON jacket were estimated based on available data.This and some other strengthening technique cost data showed that SIMCON jacketing is an economically viable technique.