Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Tính chất tĩnh và hiệu suất chịu tác động của bê tông biến đổi PU hình chữ U dưới tải trọng tác động rơi trọng lực lặp lại
Tóm tắt
Nghiên cứu này điều tra sức mạnh tác động của bê tông biến đổi polyurethane (PU) hình chữ U bằng cách sử dụng thử nghiệm tác động rơi trọng lực lặp lại. Một mẫu hình chữ U được giới thiệu trong nghiên cứu này nhằm điều chỉnh quy trình thử nghiệm của ủy ban ACI 544-2R cho thử nghiệm tác động rơi trọng lực với mục đích giảm thiểu sự rải rác kết quả của phương pháp thử nghiệm này. Các đặc tính tĩnh và khả năng chịu tác động của bê tông biến đổi PU hình chữ U đã được thử nghiệm với các trọng lượng rơi lặp lại là 0.877 kg. Tác động của chất kết dính PU lên hiệu suất cơ học và sức mạnh chịu tác động đã được đánh giá trong bốn nhóm bê tông biến đổi PU chứa 0%, 10%, 20% và 30% được chuẩn bị để sản xuất các mẫu bê tông-polyurethane (NC-PU) thông thường. Các kỹ thuật học máy (ML), bao gồm mạng nơ-ron nhân tạo (ANN) và hồi quy vector hỗ trợ (SVR), đã được sử dụng để đào tạo và thử nghiệm tập dữ liệu thực nghiệm. Kết quả cho thấy các chất kết dính PU giảm đáng kể hành vi cơ học và cải thiện sức mạnh tác động của bê tông. Tại nội dung tối ưu, sức bền uốn đã tăng 3.6%, và sức bền nén của mẫu kiểm soát (NC-PU0) cao hơn 49.17% so với mẫu bê tông chứa 20% PU (NC-PU2). Các mẫu hình chữ U làm giảm sự rải rác kết quả của thử nghiệm tác động rơi trọng lực lặp lại như được đề xuất bởi phương pháp thử nghiệm ACI 544-2R. Việc thêm 10% PU và 20% chất kết dính PU đã cải thiện sức mạnh chịu crack đầu tiên của NC-PU1, NC-PU2, và NC-PU3 lần lượt 685.71%, 1528.6%, và 157% so với mẫu NC-PU0. Các kỹ thuật học máy dự đoán chính xác N2. ANN và SVR cho thấy một mối quan hệ mạnh mẽ giữa N2 thực nghiệm và N2 dự đoán với các giá trị tương quan xác định (R2) lần lượt là 0.9944 và 0.9981 tại giai đoạn đào tạo và thử nghiệm.
Từ khóa
#bê tông polyurethane #khả năng chịu tác động #thử nghiệm tác động #học máy #mạng nơ-ron nhân tạo #hồi quy vector hỗ trợTài liệu tham khảo
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