NGHIÊN CỨU THỰC NGHIỆM VỀ VIỆC ÁP DỤNG TRC ĐỂ TĂNG CƯỜNG KHẢ NĂNG CHỊU LỰC CỦA TẤM BÊ TÔNG CỐT THÉP=EXPERIMENTAL STUDY ON THE APPLICATION OF TRC TO ENHANCE THE LOAD-BEARING CAPACITY OF REINFORCED CONCRETE SLABS

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Tác giả: Thị Thu Nga Nguyễn, Trung Kiên Nguyễn, Đình Thanh Vũ, Ngọc Quang Vũ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Special Construction Engineering, 2024

Mô tả vật lý: tr.138

Bộ sưu tập: Metadata

ID: 251757

Thêm vào giỏ

Để nâng cao khả năng chịu lực và ngăn ngừa hư hỏng, kết cấu bê tông cốt thép thường được gia cường thêm một lớp vật liệu. Nghiên cứu này tập trung vào việc đánh giá khả năng dính bám giữa lớp bê tông cốt lưới dệt (Textile Reinforced Concrete - TRC) và tấm bê tông cốt thép, thông qua thí nghiệm uốn bốn điểm. Mục tiêu chính là kiểm tra hiệu quả của kỹ thuật tạo rãnh trên bề mặt bê tông cũ nhằm cải thiện độ kết dính giữa lớp TRC và tấm bê tông. Kết quả thực nghiệm cho thấy việc gia cường bằng TRC đã cải thiện đáng kể khả năng chịu lực và chuyển vị tại giữa nhịp của tấm. Cụ thể, tấm được gia cường bằng TRC có khả năng chịu lực tăng trung bình 137% và chuyển vị giữa nhịp tăng 53% so với tấm không gia cường. Đáng chú ý, không xảy ra hiện tượng bong tách lớp vật liệu gia cường ngay cả khi kết cấu bị phá hoại, điều này cho thấy độ tin cậy của kỹ thuật tạo rãnh trong việc đảm bảo độ dính bám chắc chắn. Nghiên cứu khẳng định gia cường TRC là một giải pháp hiệu quả trong việc tăng cường khả năng chịu lực của kết cấu tấm bê tông cốt thép, đồng thời cải thiện độ an toàn khi kết cấu chịu tải trọng lớn.To enhance load-bearing capacity and prevent structural damage, reinforced concrete elements are often strengthened with additional layers of material. This study investigates the bonding performance between Textile Reinforced Concrete (TRC) and reinforced concrete slabs through four-point bending tests. The primary objective is to assess the effectiveness of surface grooving on the old concrete to improve the adhesion between the TRC layer and the slab. Experimental results demonstrate that TRC strengthening significantly improves both the load capacity and mid-span deflection of the slabs. Specifically, TRC-strengthened reinforced slabs exhibited an average 137% increase in load-bearing capacity and a 53% increase in mid-span deflection compared to unreinforced slabs. Notably, no debonding occurred, even at failure, confirming the reliability of the grooving technique in ensuring a strong bond. The study concludes that TRC is an effective method for enhancing the flexural strength of reinforced concrete slabs, while also improving safety under high loading conditions.

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