Nghiên cứu sự thay đổi vận tốc sóng trong bê tông sử dụng cát nhân tạo bằng phương pháp thí nghiệm xung siêu âm (UPV)

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Tác giả: Thị Nhàn Phạm, Đức Quyết Vũ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí điện tử Khoa học và Công nghệ QUI, 2023

Mô tả vật lý: tr.12

Bộ sưu tập: Metadata

ID: 341161

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Phương pháp thí nghiệm xung siêu âm (Ultrasonic Pulse Velocity) thuộc nhóm phương pháp không phá hoại mẫu (Non-destructive test, NDT). Trong nước có một số các nghiên cứu dựa trên hướng dẫn của TCVN 9357:2012 về đánh giá chất lượng bê tông nặng bằng vận tốc xung siêu âm để xây dựng mối quan hệ giữa cường độ chịu nén bê tông với vận tốc xung siêu âm và đo đạc chiều sâu vết nứt mở trên bê tông bằng phương pháp siêu âm. Tuy nhiên các kết quả nghiên cứu về sử dụng xung siêu âm để nghiên cứu sự thay đổi vận tốc sóng xung siêu âm trong bê tông sử dụng cát nhân tạo và đề xuất công thức xác định sơ bộ cường độ chịu nén trên vật liệu này là chưa tìm thấy. Bài báo trên cơ sở sử dụng cốt liệu là cát nhân tạo và xi măng với sáu cấp phối khác nhau chế tạo các mẫu bê tông hạt mịn có kích thước 100 mm ´ 50 mm. Kết quả đo xung vận tốc sóng siêu âm cho thấy mối quan hệ giữa vận tốc xung và cường độ nén theo hàm y = 101,98 ln(x)-795,61 (độ lệch chuẩn R² = 0,996). Kết quả nghiên cứu có thể làm cơ sở dữ liệu để xác định sơ bộ cường độ nén mẫu bê tông, cấu kiện bê tông hạt mịn trên thực tế mà không phải làm các thí nghiệm phá huỷ.The ultrasonic pulse velocity (UPV) experimental method belongs to the group of non-destructive testing (NDT) techniques. In our country, there are several studies based on the guidelines of TCVN 9357:2012 for evaluating the quality of heavy concrete using ultrasonic pulse velocity to establish a relationship between compressive strength, ultrasonic pulse velocity, and measuring the depth of open cracks in concrete using ultrasound. However, research results on using ultrasonic pulses to investigate changes in ultrasonic wave velocity in concrete using artificial sand and proposing a preliminary formula for determining compressive strength on this material have not been found yet. The paper is based on the use of artificial sand and cement with six different mix proportions to produce fine aggregate concrete samples with dimensions of 100 mm x 50 mm. The measured ultrasonic wave velocities show a relationship between pulse velocity and compressive strength described by the equation y = 101.98 ln(x) - 795.61 (with a standard deviation R² = 0.996). The research results can serve as a database for preliminarily determining the compressive strength of concrete samples and fine aggregate concrete components in practical applications without the need for destructive testing.

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