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Chloride Resistance of Cementitious Materials Containing Calcined Clay and Limestone Powder
Durability of reinforced concrete in marine environment depends largely on chloride resistance of concrete which should be always ascertained. In this article, an effect of limestone calcined clay (LC2) on chloride resistance is, thus, investigated. Limestone calcined clay cement with 7.5, 15, and 30% replacement by weight was tested with various methods. Rapid chloride penetration test (RCPT) was performed by measuring the total charge passed value according to ASTM C1202. The age of samples for RCPT was 60 and 90 days. At the age of 90-day, control sample had the charge passed of 4284 coulombs. The 7.5%, 15%, and 30% LC2 replacement samples had the charge passed of 3490, 2486, and 926 coulombs, respectively. Replacing cement with limestone calcined clay could decrease chloride ion penetrability of concrete. Moreover, the chloride binding capacity of LC2 cement paste was also tested by 42-day exposure in different concentration of NaCl solution. For 0.3 M concentration of NaCl solution, the bound chloride contents of 30% LC2 cement paste and control cement paste were 25.40 and 12.09 mg/g, respectively. The results significantly showed that LC2 cement paste had higher bound chloride content than control paste for any rate of replacement. Cement paste samples were submerged in NaCl solution for 168 days. Total and free chloride contents of pastes at different distance from exposed surface were tested according to ASTMC1152 and ASTMC1218, respectively, to compare apparent chloride diffusion coefficients of LC2 cement pastes and that of control cement paste. The results clearly showed that total chloride content of LC2 cement pastes was lower control paste. The chloride diffusion coefficient and surface chloride content of 30% LC2 was 150.05 mm2/year and 0.67% by weight, respectively. The cement paste with 30% LC2 had lower chloride diffusion coefficient and surface chloride content than control cement paste up to 50%
Chloride Resistance of Cementitious Materials Containing Calcined Clay and Limestone Powder
Durability of reinforced concrete in marine environment depends largely on chloride resistance of concrete which should be always ascertained. In this article, an effect of limestone calcined clay (LC2) on chloride resistance is, thus, investigated. Limestone calcined clay cement with 7.5, 15, and 30% replacement by weight was tested with various methods. Rapid chloride penetration test (RCPT) was performed by measuring the total charge passed value according to ASTM C1202. The age of samples for RCPT was 60 and 90 days. At the age of 90-day, control sample had the charge passed of 4284 coulombs. The 7.5%, 15%, and 30% LC2 replacement samples had the charge passed of 3490, 2486, and 926 coulombs, respectively. Replacing cement with limestone calcined clay could decrease chloride ion penetrability of concrete. Moreover, the chloride binding capacity of LC2 cement paste was also tested by 42-day exposure in different concentration of NaCl solution. For 0.3 M concentration of NaCl solution, the bound chloride contents of 30% LC2 cement paste and control cement paste were 25.40 and 12.09 mg/g, respectively. The results significantly showed that LC2 cement paste had higher bound chloride content than control paste for any rate of replacement. Cement paste samples were submerged in NaCl solution for 168 days. Total and free chloride contents of pastes at different distance from exposed surface were tested according to ASTMC1152 and ASTMC1218, respectively, to compare apparent chloride diffusion coefficients of LC2 cement pastes and that of control cement paste. The results clearly showed that total chloride content of LC2 cement pastes was lower control paste. The chloride diffusion coefficient and surface chloride content of 30% LC2 was 150.05 mm2/year and 0.67% by weight, respectively. The cement paste with 30% LC2 had lower chloride diffusion coefficient and surface chloride content than control cement paste up to 50%
Chloride Resistance of Cementitious Materials Containing Calcined Clay and Limestone Powder
RILEM Bookseries
Bishnoi, Shashank (editor) / Sahamitmongkol, Raktipong (author) / Khuon, Narith (author) / Thitikavanont, Yanapol (author)
2020-04-14
12 pages
Article/Chapter (Book)
Electronic Resource
English
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