A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A Case Study Evaluating the Use of Lithium Nitrate to Arrest Alkali-Silica Reaction in an Existing Concrete Pavement
Presented herein are findings from a three-year field trial in which lithium nitrate was applied at a rate of 0.006 gal per square foot, twice a year, on an existing concrete pavement in Norfolk, Nebraska, in the attempt to arrest on-going alkali-silica reaction (ASR) distress. Various destructive and non-destructive means were utilized to measure the effectiveness of the lithium treatments. Concrete cylinders were cored for petrographic examination and split-tension testing. Powder samples were taken to determine the lithium content of the concrete pavement. Nondestructive evaluations included the use of crack mapping, a Schmidt hammer, a velocity ("V") meter, and an impact echo apparatus. The results to date have not shown definitive benefits of the lithium material in arresting the ASR process; however, the observed lithium penetration and resulting concentrations by gravity soaking has been very limited. Presumably the pavement has not reached the deterioration state for optimal permeability for penetration of the lithium material into the concrete mass. Other application techniques on hardened concrete such as surface pressurization and vacuum impregnation were investigated to a limited extent as alternate methods to gravity soaking. The surface pressurization technique produced promising results in so far as achieving higher lithium concentrations. Effort is now needed in achieving higher lithium concentrations on a larger scale so that a more realistic evaluation of the effects of the lithium treatment can be performed.
A Case Study Evaluating the Use of Lithium Nitrate to Arrest Alkali-Silica Reaction in an Existing Concrete Pavement
Presented herein are findings from a three-year field trial in which lithium nitrate was applied at a rate of 0.006 gal per square foot, twice a year, on an existing concrete pavement in Norfolk, Nebraska, in the attempt to arrest on-going alkali-silica reaction (ASR) distress. Various destructive and non-destructive means were utilized to measure the effectiveness of the lithium treatments. Concrete cylinders were cored for petrographic examination and split-tension testing. Powder samples were taken to determine the lithium content of the concrete pavement. Nondestructive evaluations included the use of crack mapping, a Schmidt hammer, a velocity ("V") meter, and an impact echo apparatus. The results to date have not shown definitive benefits of the lithium material in arresting the ASR process; however, the observed lithium penetration and resulting concentrations by gravity soaking has been very limited. Presumably the pavement has not reached the deterioration state for optimal permeability for penetration of the lithium material into the concrete mass. Other application techniques on hardened concrete such as surface pressurization and vacuum impregnation were investigated to a limited extent as alternate methods to gravity soaking. The surface pressurization technique produced promising results in so far as achieving higher lithium concentrations. Effort is now needed in achieving higher lithium concentrations on a larger scale so that a more realistic evaluation of the effects of the lithium treatment can be performed.
A Case Study Evaluating the Use of Lithium Nitrate to Arrest Alkali-Silica Reaction in an Existing Concrete Pavement
Kelly, Michael T. (author) / Tuan, Christopher Y. (author)
Airfield and Highway Pavements Specialty Conference 2006 ; 2006 ; Atlanta, Georgia, United States
Airfield and Highway Pavement ; 625-635
2006-04-28
Conference paper
Electronic Resource
English
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