Nghiên cứu ảnh hưởng của cốt sợi phân tán đến một số tính chất của bê tông trong môi trường ăn mòn

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Tác giả: Thị Thắng Nguyễn, Phương Lê Vũ

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng 2022

Mô tả vật lý: 90-95

Bộ sưu tập: Metadata

ID: 407017

Thêm vào giỏ Liên kết toàn văn

Trong công trình biển, bê tông là một trong những loại vật liệu được nhiều nhà thiết kế vật liệu lựa chọn sử dụng. Tuy nhiên, bê tông sử dụng trong công trình biển có những yêu cầu đặc biệt hơn bê tông thông thường vì phải chịu tác động ăn mòn xâm thực của các yếu tố ăn mòn chứa trong nước và khí quyển biển. Bài báo này trình bày nghiên cứu sử dụng một số loại cốt sợi phân tán để cải thiện khả năng chống ăn mòn cho bê tông cường độ cao M80 trong môi trường chứa SO4 2-, Cl-. Các loại cốt sợi sử dụng gồm sợi kích thước lớn và sợi kích thước nhỏ. Sợi kích thước lớn gồm: sợi thép Dramix RC- 80/60-BN (chiều dài 60 mm), sợi polyme Mega Mesh MG-70/55 (chiều dài 55 mm)
sợi kích thước nhỏ: sợi polyme gốc polypropylene (PP) (chiều dài 18 mm). Sợi kích thước nhỏ dùng với hàm lượng 0,2% và sợi kích thước lớn dùng với hàm lượng 0,4% tính theo thể tích bê tông. Các kết quả nghiên cứu cho thấy, cốt sợi phân tán hoàn toàn có khả năng chống nứt, hạn chế khả năng mở rộng vết nứt cho bê tông, từ đó cải thiện độ chịu lực và khả năng chống ăn mòn cho bê tông khi phải làm việc trong điều kiện có tác nhân ăn mòn., Tóm tắt tiếng anh, In marine construction, concrete is one of the materials chosen by many material designers. However, concrete used in marine works has special requirements than ordinary concrete because it is subject to corrosive effects of corrosive elements contained in water and marine atmosphere. This paper presents a study on using some types of dispersed fiber reinforcement to improve the corrosion resistance of high - strength concrete M80 in the environment containing SO4 2-, Cl-. Types of reinforcement used include large size yarn and small size yarn. Large size yarns include: Dramix steel yarn RC-80/60-BN (length 60 mm), Mega Mesh polymer yarn MG-70/55 (length 55 mm)
microfiber: polypropylene (PP) - based polymer fiber (length 18 mm). Small size fibers are used with a content of 0,2% and large fibers are used with a content of 0,4% by volume of concrete. The research results show that the fully dispersed fiber reinforcement is resistant to cracking, limiting the ability to widen the cracks for concrete, thereby improving the bearing strength and corrosion resistance of concrete when required working in corrosive conditions.

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