Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Phân tích đặc trưng 3D theo thời gian của sự phát triển vi cấu trúc giai đoạn đầu của xi măng Portland
Tóm tắt
Tương tác đồng bộ X-quang vi mô tại chỗ với độ phân giải theo thời gian tiết lộ những chi tiết mới về các quá trình hóa học và vật lý diễn ra khi xi măng Portland đông cứng. Quá trình chuyển đổi từ bột nhão dạng lỏng thành sản phẩm rắn có thể được giám sát trên thang thời gian dưới một phút, với các điều chỉnh chuyển động/lắng của mẫu được áp dụng nhằm theo dõi từng hạt khi chúng phản ứng, hydrat hóa và kết nối thành một khối rắn duy nhất mạnh mẽ. Sự phát triển của các pha hydrat tạo sức mạnh xung quanh các hạt xi măng, và của mạng lưới lỗ rỗng chứa đầy chất lỏng bao quanh chúng, có thể được quan sát trực tiếp ở mức độ từng hạt xi măng thông qua việc áp dụng giao thức theo dõi này. Khi xi măng tiếp xúc với nước, một lớp có mật độ khác với phần lớn các hạt xi măng trở nên quan sát được trên bề mặt hạt trong thời kỳ khởi phát (thời điểm mà nhiệt sinh ra từ bột nhão tương đối thấp). Khi quá trình hydrat hóa tiếp tục, các sản phẩm phản ứng phát triển từ bề mặt hạt vào khu vực ban đầu chứa đầy chất lỏng, và cũng vào không gian mà trước đây các hạt xi măng chiếm giữ, tạo ra một gradient mật độ trong vi cấu trúc. Khi phản ứng tăng tốc và các thể rắn lớn hơn bắt đầu kết tủa, cấu trúc rắn mới hình thành thẩm thấu qua việc kết nối các hydrat ngoài có mật độ thấp đã kết tụ, sau đó sẽ đông đặc khi quá trình hydrat hóa tiếp diễn. Cuối cùng, điều này dẫn đến sự đông đặc của cấu trúc thành một ma trận rắn rỗng.
Từ khóa
#xi măng Portland #vi cấu trúc #hydrat hóa #X-quang vi mô #đặc trưng 3DTài liệu tham khảo
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