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Website: www.jomc.vn
Nghiên cứu tổng quan về ứng xử cơ học và tiềm năng ứng dụng của bê tông cốt lưới dệt dự ứng lực
Tóm tắt
Bê tông cốt lưới dệt (BTCLD) là vật liệu composite gồm bê tông hạt mịn và lưới sợi cường độ cao, có ưu điểm về trọng lượng nhẹ, độ bền cao và khả năng chống ăn mòn. Tuy nhiên, BTCLD thông thường dễ xuất hiện vết nứt sớm ở tải trọng thấp, làm hạn chế hiệu quả chịu lực của cấu kiện. Việc áp dụng công nghệ dự ứng lực (DUL) giúp trì hoãn sự hình thành vết nứt, kéo dài trạng thái đàn hồi và tăng độ cứng của cấu kiện. Bài báo tổng quan hai phương pháp tạo DUL là cơ học và hóa học, đồng thời phân tích vai trò của dự ứng lực và lớp phủ epoxy đối với khả năng dính bám của bó sợi. Ngoài ra, các yếu tố ảnh hưởng đến mất mát dự ứng lực dài hạn cũng được xem xét. Kết quả cho thấy BTCLD dự ứng lực có tiềm năng lớn khi sử dụng làm ván khuôn vĩnh cửu cho sàn liên hợp, đồng thời đặt ra nhu cầu nghiên cứu về hệ thống neo và hoàn thiện các hướng dẫn thiết kế cho loại kết cấu này.
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