Коррозия стальной арматуры в цементном камне с гидрофобизирующей добавкой под воздействием агрессивной хлоридсодержащей среды
DOI:
https://doi.org/10.52957/27821919_2023_1_17Ключевые слова:
гидрофобизирующая добавка, гидрофобизированный бетон, хлоридная коррозия, коррозия арматуры, скорость коррозииАннотация
Для повышения долговечности железобетонных изделий важно определять сроки прекращения защиты стальной арматуры бетонным покрытием и разработать способы увеличения коррозионной стойкости бетона в средах высокой степени агрессивности. В цементную смесь вводили 0,3-1,3 мас. % стеарата кальция с целью обеспечения объемной гидрофобизации цементного камня бетона. Система «цементный камень – стальная арматура» подвергалась воздействию 2%-го раствора MgCl2. Через 6 мес. коррозии в агрессивной хлоридсодержащей среде в цементном камне, не содержащем стеарата кальция, происходит нарушение пассивности арматуры, тогда как в цементном камне с добавкой стеарата кальция в течение двух лет потенциал поверхности стали остается неизменным. Малые значения показателей скорости коррозии свидетельствуют об отсутствии повреждений стальной арматуры в цементном камне. Однако агрессивные частицы, накапливающиеся у поверхности арматуры, интенсифицируют коррозию стали. В цементном бетоне марок W4-W16 по водонепроницаемости коррозия стальной арматуры протекает в 2-5 раз медленнее по сравнению с арматурой в бетоне без добавки гидрофобизатора. Коррозия стали в гидрофобизированном бетоне начинается позднее, так как для достижения предельного содержания хлорид-ионов у поверхности арматуры требуется значительно больше времени.
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