Đánh giá ảnh hưởng của tro trấu và gạch đất sét đến cường độ của bê tông cốt sợi thép bằng phương pháp đáp ứng bề mặt=Evaluation of the effects of rice husk ash and clay brick powder on the strength of high performance fiber reinforced concrete using response surface methodology

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Tác giả: Ngọc Trà My Lâm

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.80

Bộ sưu tập: Metadata

ID: 478654

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Bài báo trình bày nghiên cứu ảnh hưởng của tro trấu và bột gạch đất sét đến cường độ nén, uốn ở 28 ngày tuổi của bê tông cốt sợi thép (HPFRC) bằng phương pháp đáp ứng bề mặt. Tro trấu được sử dụng để thay thế silica fume với hàm lượng thay thế từ 10% đến 40%, trong đó bột gạch đất sét sẽ thay thế tro bay với hàm lượng từ 20% đến 80%. Với phương pháp thiết kế hỗn hợp trung tâm (CCD) của phương pháp bề mặt đáp ứng (RSM), mười ba cấp phối HPFRC đã được chuẩn bị trong nghiên cứu này để thí nghiệm cường độ nén, uốn ở 28 ngày tuổi. Kết quả thí nghiệm cho thấy rằng, ta có thể sử dụng tro trấu kết hợp bột gạch đất sét để chế tạo ra HPFRC có cường độ nén, uốn ở 28 ngày tuổi bằng cường độ HPFRC đối chứng. Cụ thể là khi sử dụng tro trấu ở tỷ lệ 18% và bột gạch đất sét 49%
hoặc tro trấu 19% và bột gạch đất sét 80%
hoặc tro trấu 23% và bột gạch đất sét 65%
hay tro trấu 34% và bột gạch đất sét 35,5% sẽ tạo ra HPFRC có cường độ nén ở 28 ngày tuổi là 100 MPa và cường độ uốn ở 28 ngày tuổi là 32,5 MPa bằng HPFRC đối chứng. Ngoài ra, để tối ưu hóa hàm lượng sử dụng tro trấu và bột gạch đất sét, ta có thể sử dụng 40% tro trấu kết hợp với 80% bột gạch đất sét để tạo ra HPFRC có cường độ nén và uốn cao hơn HPFRC thông thường ở 28 ngày tuổi. Đồng thời, việc sử dụng tro trấu và bột gạch đất sét để chế tạo HPFRC không làm thay đổi ứng xử uốn và ứng xử nén của HPFRC. Bên cạnh đó, hai phương trình thể hiện mối quan hệ giữa cường độ nén/ cường độ uốn ở 28 ngày tuổi của HPFRC với tỷ lệ tro trấu và bột gạch đất sét sử dụng trong hỗn hợp được đề xuất trong nghiên cứu này. Từ khóa: Bê tông cốt sợi thép
cường độ
gạch đất sét
phương pháp đáp ứng bề mặt
tro trấu.This paper presents a study on the effects of rice husk ash and clay brick powder on compressive strength and flexural strength of high performance fiber reinforced concrete (HPFRC) at 28-day age using response surface methodology. The weight of silica fume using in HPFRC was replaced by rice husk ash from 10% to 40%, while fly ash was substituted by clay brick powder at range of 20% to 80%. Thirteen mixtures of HPFRC were prepared based on central composite design of response surface methodology in order to investigate the compressive strength and flexural strength of HPFRC at 28-day age. The result indicated that combination of fly ash and clay brick powder can be produced UHPFRC which have the compressive strength and flexural strength as much as those of the control. For example, using 18% rice husk ash combined with 49% clay brick powder
or 19% rice husk ash combined with 80% clay brick powder
or 23% rice husk ash combined with 65% clay brick powder
or 34% rice husk ash combined with 35.5% clay brick powder can be made HPFRCs that attained the 28-day compressive strength of 100 MPa and 28-day flexural strength of 32.5 MPa. Additionally, the compressive and flexural strength of HPFRC containing 40% rice husk ash and 80% clay brick powder were higher than those of the HPFRC control at 28-day age. Furthermore, there was no change in compressvie and flexural behaviours of the HPFRC containing rice husk ash and clay brick powder. Two models displayed the relationship between compressive strength/ flexural strength and defection were established in this study. Keywords: High performance fiber reinforced concrete
strength
clay brick
response surface methodology
rice husk ash.

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