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  <leader>02598nam a2200217Ia 4500</leader>
  <controlfield tag="001">CTU_238053</controlfield>
  <controlfield tag="008">210402s9999    xx            000 0 und d</controlfield>
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   <subfield code="a">693.6</subfield>
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   <subfield code="b">H531</subfield>
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  <datafield tag="088" ind1=" " ind2=" ">
   <subfield code="a">8580202</subfield>
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   <subfield code="a">Bùi, Phúc Huỳnh</subfield>
  </datafield>
  <datafield tag="245" ind1=" " ind2="0">
   <subfield code="a">Nghiên cứu chế tạo bê tông hạt nhỏ có độ linh động cao ứng dụng cho các kết cấu bê tông thủy công :</subfield>
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  <datafield tag="245" ind1=" " ind2="0">
   <subfield code="b">Luận văn tốt nghiệp Cao học. Chuyên ngành Kỹ thuật xây dựng công trình thủy</subfield>
  </datafield>
  <datafield tag="245" ind1=" " ind2="0">
   <subfield code="c">Bùi Phúc Huỳnh ; Huỳnh Trọng Phước (Cán bộ hướng dẫn)</subfield>
  </datafield>
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   <subfield code="a">Cần Thơ</subfield>
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   <subfield code="b">Trường Đại học Cần Thơ</subfield>
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   <subfield code="c">2020</subfield>
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  <datafield tag="520" ind1=" " ind2=" ">
   <subfield code="a">Đề tài này nhằm mục đích nghiên cứu chế tạo bê tông hạt nhỏ có độ linh động cao ứng dụng cho các kết cấu bê tông thủy công. Có hai nhóm cấp phối được thiết kế trong nghiên cứu này bao gồm: Nhóm I gồm ba cấp phối bê tông với tỉ lệ nước/chất kết dính (w/b) lần lượt là 0,32; 0,37 và 0,42 được thử nghiệm. Nhóm II gồm 5 cấp phối bê tông, trong đó lượng xi măng lần lượt được thay thế bởi xỉ lò cao ở mức 10%, 20%, 30%, 40% và 50%. Thuật toán thiết kế hỗn hợp lèn chặt được ứng dụng trong nghiên cứu này. Các đặc tính kỹ thuật của bê tông được đánh giá thông qua các thí nghiệm kiểm tra độ linh động, khối lượng thể tích, độ hút nước, độ co khô, cường độ chịu nén và chịu uốn, độ thấm ion clo và tốc độ truyền sóng xung siêu âm qua mẫu. Kết quả thí nghiệm cho thấy các hỗn hợp bê tông có độ linh động được điều chỉnh trong khoảng 26 ± 1 cm nhằm đảm bảo tính công tác cao của hỗn hợp bê tông. Việc tăng tỉ lệ w/b và tỉ lệ thay thế xi măng bởi xỉ lò cao có ảnh hưởng nhiều đến các tính chất kỹ thuật của hỗn hợp bê tông tươi và cả mẫu bê tông đóng rắn.</subfield>
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  <datafield tag="650" ind1=" " ind2=" ">
   <subfield code="a">Concrete construction,Bê tông xây dựng</subfield>
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  <datafield tag="910" ind1=" " ind2=" ">
   <subfield code="c">tvtrong</subfield>
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  <datafield tag="980" ind1=" " ind2=" ">
   <subfield code="a">Trung tâm Học liệu Trường Đại học Cần Thơ</subfield>
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