ĐÁNH GIÁ ẢNH HƯỞNG CỦA CÁT BIỂN VỚI HÀM LƯỢNG ION CLO KHÁC NHAU ĐẾN TÍNH CHẤT CỦA BÊ TÔNG

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Tác giả: Kim Thu Le, Viet Hung Le, Van Hung Luong

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Special Construction Engineering, 2023

Mô tả vật lý: tr.117

Bộ sưu tập: Metadata

ID: 340296

Thêm vào giỏ Liên kết toàn văn

Bài báo trình bày kết quả nghiên cứu đánh giá ảnh hưởng của việc sử dụng cát biển với hàm lượng ion clo trong cát khác nhau đến tính chất của hỗn hợp bê tông, cơ lý và độ bền lâu của bê tông. Nghiên cứu đã thực hiện đánh giá trên mẫu cát biển có hàm lượng ion clo khác nhau bao gồm mẫu cát biển nguyên khai (hàm lượng ion clo ~ 0,15%), hai mẫu cát biển qua rửa (khử muối) (0,024%, 0,05%) và mẫu cát biển bổ sung muối clorua (0,375%) và so sánh với mẫu cát sông. Các mẫu cát có mô đun độ lớn xấp xỉ nhau trong khoảng 2,3 - 2,5. Kết quả nghiên cứu cho thấy, so với cát biển qua rửa và cát sông, các cấp phối bê tông sử dụng cát biển có hàm lượng ion clo cao làm tăng cường nước trộn và giảm khả năng duy trì độ sụt của hỗn hợp bê tông
cường độ nén tuổi sớm (7 ngày) tăng nhưng cường độ tuổi muộn (91 và 365 ngày) giảm trong cả hai trường hợp bảo dưỡng tiêu chuẩn và bảo dưỡng khô-ướt. Ngoài ra, khả năng chống thấm (nước, ion clo), khả năng bảo vệ cốt thép khỏi ăn mòn của bê tông sử dụng cát biển có hàm lượng ion clo cao cũng giảm hơn so với cát biển qua rửa và cát sông.This article presents the results of a study that evaluated the effects of using sea sand with varying contents of chloride ions on the properties of concrete, including physical and mechanical properties as well as durability. The study was carried out on the sea sand samples with different chloride ion contents, including as-received sea sand samples with a chloride ion content of approximately 0.15%, two washed (desalted) sea sand samples with chloride ion content of 0.024% and 0.05%, and sea sand samples added with chloride salt (0.375%), which were then compared with river sand samples. The sand samples had approximately the same fineness modulus ranging from 2.3 - 2.5. The research results indicated that compared with washed sea sand and river sand, concrete mixes using sea sand with high chloride ion content increased the mixing water and reduced the slump retainability of the fresh concrete. Furthermore, early compressive strength (7 days) increased but late age strength (91 and 365 days) decreased in both standard curing and wet-dry circle curing cases. Additionally, the impermeability (water and chloride ion) and the ability to protect the reinforcement from corrosion in concrete were reduced when using sea sand with high chloride ion content compared to washed sea sand and river sand.

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