Đăng nhập
 
Tìm kiếm nâng cao
 
Tên bài báo
Tác giả
Năm xuất bản
Tóm tắt
Lĩnh vực
Phân loại
Số tạp chí
 

Bản tin định kỳ
Báo cáo thường niên
Tạp chí khoa học ĐHCT
Tạp chí tiếng anh ĐHCT
Tạp chí trong nước
Tạp chí quốc tế
Kỷ yếu HN trong nước
Kỷ yếu HN quốc tế
Book chapter
Tạp chí quốc tế 2015
Số tạp chí 91(2015) Trang: 208-215
Tạp chí: Construction and Building Materials

The high-volume low calcium fly ash (HVFA) cement has been successfully applied to the roller compacted concrete, highway base material, and other structural constructions. The HVFA cement based high performance concretes have high workability, acceptable strengths, and superior durability. However, the issues of increase in setting time and decrease in early compressive strength remain. The aim of this investigation is to use the circulating fluidized bed combustion (CFBC) fly ash to improve the mechanical properties, including the compressive strengths, dynamic Young’s modulus (Ed), and dynamic shear modulus (Gd) of the HVFA cement pastes at early ages. The properties of HVFA cement pastes prepared by ordinary Portland cement (OPC) that was partially replaced by Class F fly ash (FFA) with and without sulfate activators (i.e., gypsum or CFBC fly ash) by 50% in weight were explored. The microstructures and the hydration products of the modified HVFA cement pastes were used to explain the improved compressive strengths and dynamic moduli of the specimens. Experimental results showed that the mixture with sulfate activators (i.e., the CFBC fly ash or gypsum) containing 0.81–1.62% SO3 can significantly improve the mechanical properties of the modified HVFA cement pastes at early ages due to more compacted microstructures. The accelerated hydration of tricalcium silicate (C3S) and more precipitated ettringite (AFt) formation of hardened pastes clearly confirm the important role of CFBC fly ash to enhance the mechanical properties of the modified HVFA cement pastes.

Các bài báo khác
Số tạp chí 164(2015) Trang: 41-67
Tạp chí: Journal of Optimization Theory and Applications
Số tạp chí 25(2015) Trang: 2561-2588
Tạp chí: SIAM Journal on Optimization
Số tạp chí 52(2015) Trang:
Tạp chí: Journal of Network and Computer Applications
Số tạp chí 2(2015) Trang: 1-4
Tạp chí: International Journal of Advances in Mechanical and Civil Engineering
Số tạp chí 752-753(2015) Trang: 588-592
Tạp chí: Applied Mechanics and Materials
Số tạp chí 754-755(2015) Trang: 468-472
Tạp chí: Applied Mechanics and Materials
Số tạp chí 2015(2015) Trang: 623-626
Tạp chí: Green Building, Materials and Civil Engineering
Số tạp chí 2015(2015) Trang: Open access
Tạp chí: Advances in Materials Science and Engineering
Số tạp chí 93(2015) Trang: 335-341
Tạp chí: Construction and Building Materials
Số tạp chí 123982(2015) Trang: 1-10
Tạp chí: International Journal of Distributed Sensor Networks
Số tạp chí Proceedings(2015) Trang: 648-651
Tạp chí: International Conference on Computer Information Systems and Industrial Applications
Số tạp chí Proceedings(2015) Trang: 100-105
Tạp chí: International Conference on Computing & Communication Technologies Research, Innovation, and Vision for Future (RIVF)
Số tạp chí Proceedings(2015) Trang: 1758-1763
Tạp chí: International Conference on Fuzzy Systems and Knowledge Discovery
Số tạp chí 9(34)(2015) Trang: 90-97
Tác giả: Vương Quốc Duy
Tạp chí: Australian Journal of Basic and Applied Sciences


Vietnamese | English






 
 
Vui lòng chờ...