AASHTO T (Salt Ponding Test). 4. Bulk Diffusion Test (Nordtest NTBuild ). 5. AASHTO T (Rapid Chloride Permeability Test). 6. AASHTO T Electrical Indication of Concrete’s Ability to Resist Chloride Ion Penetration. Lab ID: Use A rapid test to determine concretes relative. AASHTO T – Download as PDF File .pdf), Text File .txt) or read online.
|Published (Last):||26 November 2004|
|PDF File Size:||11.54 Mb|
|ePub File Size:||4.52 Mb|
|Price:||Free* [*Free Regsitration Required]|
It was determined that the addition of pozzolans to concrete lowers the chloride permeability as measured by the permeability machine.
Four mixes were made: Laboratory built machine was constructed for the chloride permeability testing of concrete by measuring electric current through a specimen between a salt solution and a base solution. The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection aahto published concrete abstracts.
Click here to become an online Journal subscriber. Specimens from each mix were evaluated for chloride aadhto content by the day salt ponding test and t27 the laboratory built machine for chloride permeability after curing 28 days.
The method is essentially a measurement of electrical conductivity of concrete, which depends on both the pore structure and the chemistry of the pore solution.
Specimens from these mixes were also taken from the salt ponding slabs after completion of the ponding test to examine the effect chloride ion content has on the operation of the chloride permeability machine. It was determined that there was a correlation and that the permeability machine was satisfactory for determining chloride permeability in concrete. Class F fly ash and silica fume in the concrete had a major effect in lowering the chloride permeability in concrete as measured by the permeability machine.
The results from each test were evaluated to see if there was correlation between chloride ion content and the chloride permeability. Caijun Shi, Julia A.
AASHTO T Test for Concretes Ability to Resist Chloride Ion | CTL
Specimens containing pozzolans were also examined for chloride permeability after a cure of days. Each mix was tested for chloride ion content by aahsto day salt ponding method and for chloride permeability at a day cure by the permeability machine. Chemical composition of pore solution has little to do with the transport of chloride ions in the concrete; thus, it is not correct to use passed charge to rank the chloride penetration resistance of concrete made with supplementary cementing ashto.
AASHTO T and ASTM C have specified a rapid test method to rank the chloride penetration resistance of various concretes by applying a potential of 60 V DC to a concrete specimen t2277 measuring the charge passed through the specimen during six hours of testing.
Analyses based on published results have indicated that the replacement of portland cement with supplementary cementing materials, such as silica fume, can reduce the electrical conductivity of concrete more than 90 percent due to the change in pore solution composition in the concrete.
Stegemann, and Robert J.
International Concrete Abstracts Portal
The first was to evaluate the machine’s performance. International Concrete Abstracts Portal. Iowa Center for the Book. The second purpose of this study was to examine the effects that pozzolans have on the chloride permeability of concrete. This study had two purposes.
Transportation, Department of Preview.