Ảnh Hưởng của Sợi Polypropylene và Sợi Thủy Tinh Đến Độ Bền Nước Đá Của Bê Tông Cát Sa Mạc

KSCE Journal of Civil Engineering - Tập 28 - Trang 342-353 - 2023
Lina Hou1, Shiliang Jian1, Wei Huang2
1College of Architecture Engineering, Xi’an Technological University, Xi’an, China
2College of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an, China

Tóm tắt

Để nghiên cứu ảnh hưởng của sợi polypropylene (PP) và sợi thủy tinh đến độ bền nước đá của bê tông cát sa mạc (DSC), các thí nghiệm đông lạnh nhanh đã được thực hiện để điều tra quy luật hư hỏng do đông lạnh và tan băng bằng cách sử dụng các chỉ số như tổn thương rõ ràng, mất khối lượng và mô đun đàn hồi động tương đối; Dựa trên phương pháp thẩm thấu thủy ngân (MIP) và kính hiển vi điện tử quét (SEM), sự tiến hóa cấu trúc vi mô được phân tích để làm rõ cơ chế tăng cường khả năng chịu lạnh của sợi. Phân tích quá trình hư hỏng do đông lạnh và tan băng của bê tông cát sa mạc gia cường sợi (FRDSC) và dự đoán tuổi thọ chịu lạnh. Kết quả cho thấy rằng các sợi có thể cải thiện đáng kể khả năng chịu lạnh của DSC. Bạc sợi lai có hiệu ứng tăng cường cao nhất, tiếp theo là sợi PP và sợi thủy tinh. Mô đun đàn hồi động của DSC có 0.15% sợi PP và 0.05% sợi thủy tinh lên đến 95%. Tỷ lệ phân phối lỗ của FRDSC thay đổi nhanh hơn, nhưng vẫn tốt hơn so với DSC tham chiếu sau khi đông lạnh và tan băng. Sợi PP và sợi thủy tinh có thể phát huy tốt vai trò của mình ở cả giai đoạn vi mô và vĩ mô trong sự phát triển nứt của DSC. Mô hình hư hỏng do đông lạnh và tan băng có độ chính xác cao và DSC trộn với sợi có thể cải thiện đáng kể tuổi thọ phục vụ của các công trình ở miền Bắc Trung Quốc.

Từ khóa

#polypropylene fiber #glass fiber #frost resistance #desert sand concrete #freeze-thaw damage

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