Ảnh hưởng của hàm lượng sợi Polypropylene lên các đặc tính kỹ thuật của bê tông bọt

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Tác giả: Thị Thương Lê, Thị Mùi Nguyễn, Thị Thanh Nguyễn, Thị Hà Phương Trịnh

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học Kỹ thuật Thủy lợi và Môi trường, 2022

Mô tả vật lý: tr.52

Bộ sưu tập: Metadata

ID: 332566

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Để khuyến khích việc tái sử dụng các chất thải công nghiệp trong sản xuất vật liệu xây dựng cũng như tăng cường độ chịu uốn của bê tông bọt, nghiên cứu này sử dụng tro bay thay thế 40% xi măng làm chất kết dính kết hợp với các hàm lượng sợi polypropylene (PP) khác nhau trong sản xuất bê tông bọt. Bốn mẫu bê tông bọt được thiết kế với tỷ lệ nướcchất kết dính bằng 0,23 và hàm lượng sợi PP bằng 0
0,3
0,6
và 1,0% tổng khối lượng chất kết dính. Tất cả các mẫu bê tông trong nghiên cứu này có khối lượng thể tích khô trong khoảng 1000 ± 50 kg/m3. Kết quả nghiên cứu cho thấy, khi tăng hàm lượng sợi PP làm giảm khối lượng thể tích bê tông tươi và bê tông khô, hệ số truyền nhiệt, và vận tốc truyền xung siêu âm, tuy nhiên làm tăng độ hút nước, cường độ chịu nén và cường độ chịu uốn. Mẫu bê tông sử dụng 1% hàm lượng sợi PP cho cường độ chịu nén và chịu uốn cao nhất, và khối lượng thể tích cũng như hệ số truyền nhiệt nhỏ nhất. Ảnh hưởng của hàm lượng sợi PP lên cường độ chịu uốn rõ rệt và đáng kể hơn lên cường độ chịu nén. Các sợi PP đóng vai trò như cốt thép trong bê tông thông thường làm tăng cường độ chịu nén và chịu uốn của bê tông bọt.To encourage the recycling of the industrial waste in the production of construction materials and enhance the flexural strength of foamed concrete, this study used fly ash as a binder material to replace 40% cement incorporating various polypropylene (PP) fiber contents in producing lightweight foamed concrete. Four foamed concrete mixtures were designed with a water-to-binder ratio of 0.23 and PP fiber contents were 0, 0.3, 0.6, and 1.0 by the total mass of binder materials. All foamed concrete in this study had a dry density of 1000 ± 50 kg/m3 . Test results showed that increasing PP fiber contents resulted in a reduction in the unit weight of fresh and hardened con crete, thermal conductivity, andultrasonic pulse velocity, but an increment in water absorption, compressive strength, and flexural strength. The mixture with 1% PP fiber had the highest compressive strength, flexural strength
and the lowest unit weight and thermal conductivity. The effect of PP content on the flexural strength is more significant than that on the compressive strength. The PP fiber plays an important role as reinforcement to increase both compressive and flexural strength of foamed concrete.

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