Ảnh hưởng của sợi nano xenluloza đến độ lưu biến, cấu trúc vi mô và cường độ của xỉ lò cao đã hoạt hóa kiềm: sự so sánh với xi măng Portland thông thường

Matériaux et constructions - Tập 54 - Trang 1-18 - 2021
Hassan Ez-zaki1, Laura Riva2, Maurizio Bellotto1, Luca Valentini1, Enrico Garbin1, Carlo Punta2, Gilberto Artioli1
1CIRCe, Department of Geosciences, University of Padova, Padova, Italy
2Department of Chemistry, Materials, and Chemical Engineering “G. Natta” and INSTM Local Unit, Politecnico Di Milano, Milano, Italy

Tóm tắt

Bài báo này báo cáo về ảnh hưởng của sợi nano xenluloza (CNFs) đến các thuộc tính trong trạng thái tươi của xỉ lò cao đã hoạt hóa kiềm (GGBS). Các sợi CNFs đã được chức năng hóa bề mặt (oxy hóa) được thêm vào các hệ nhũ tương nước GGBS đã hoạt hóa kiềm (bột thủy lực). Hành vi lưu biến của các hỗn hợp bột được so sánh với xi măng Portland thông thường (OPC) và được giải thích dựa trên sự tương tác giữa bề mặt CNF và khoáng chất, và tương tác giữa CNF và nước cũng như khả năng nở. Sự phân tán nước của các CNFs với các mức độ chức năng hóa bề mặt khác nhau dẫn đến việc hình thành các gel với độ nhớt và ứng suất giới hạn khác nhau, do tính ưa nước và đặc tính hấp thụ nước khác nhau của chúng. Khi tăng mức độ oxy hóa bề mặt của CNFs, độ nhớt của sự phân tán nước của CNF giảm và sự hấp thụ nước của CNF tăng, trong khi đó độ nhớt của bột tươi tăng lên do giảm lượng nước trộn sẵn có. Trong trạng thái cứng, các bột thủy lực cho thấy sự khác biệt về cường độ cơ học liên quan đến loại và lượng CNF ảnh hưởng đến tính thấm của ma trận, như được chứng minh bởi nghiên cứu cấu trúc vi mô được thực hiện bằng vi quang phổ X-ray. Sự hiện diện của lượng CNFs cao hơn gây ra sự hình thành các khối khí rỗng có thể hoạt động như những bộ tập trung ứng suất do khả năng nở của các sợi nano.

Từ khóa

#sợi nano xenluloza #xỉ lò cao #hoạt hóa kiềm #độ lưu biến #cấu trúc vi mô #cường độ

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