Thông tin chung

  English

  Đề tài NC khoa học
  Bài báo, báo cáo khoa học
  Hướng dẫn Sau đại học
  Sách và giáo trình
  Các học phần và môn giảng dạy
  Giải thưởng khoa học, Phát minh, sáng chế
  Khen thưởng
  Thông tin khác

  Tài liệu tham khảo

  Hiệu chỉnh

 
Số người truy cập: 74,204,392

 Proposition, validation d’un modèle du seuil d’interface à partir des paramètres de formulation des bétons et calcul de la pression de pompage
Tác giả hoặc Nhóm tác giả: Chanh-Trung Mai
Nơi đăng: PhD Thesis in Civil Engineering - France; Số: 19-03-2015;Từ->đến trang: 1-158;Năm: 2015
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
With many advantages over traditional techniques, the pumping technique is widely used nowadays in the civil engineering field. To use this technique, the concrete must be considered "pumpable". Previous studies have all shown that the pumpability of concrete depends on the friction at the interface between the concrete and the pipe wall (the viscous constant and the interface yield stress). Improving pumpability (while maintaining stability, homogeneity and mechanical properties of concrete) will reduce the implementation time of concrete and to advance work on site. In this context, the main objective of this work is the modeling of the interface yield stress from the formulation parameters and calculating the concrete pumping pressure. To facilitate the study, an experimental database was built to demonstrate the effect of the composition parameters of ordinary concrete and concrete with mineral additions on the interface parameters, so the pumpability. This database was then used to propose and validate an interface yield stress calculation model based on composition parameters and slump. The precision of this model is of around ± 13%. Ensuite, le modèle proposé a été utilisé pour estimer la pression de pompage. The comparison between the estimated pumping pressures and those measured experimentally on the site by other researchers has shown that the proposed method provides the pressure values with a precision of the order of 15%. The results of this study provide important scientific database for the pumping technology users and highlight the role of each formulation component on the interface parameters. They can also be used for other future research work.Keywords: concrete pumping, pumping pressure, tribometer, friction, viscous constant, interface yield stress, rheology, composition parameters, modeling.
© Đại học Đà Nẵng
 
 
Địa chỉ: 41 Lê Duẩn Thành phố Đà Nẵng
Điện thoại: (84) 0236 3822 041 ; Email: dhdn@ac.udn.vn