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  • Công bố khoa học và công nghệ Việt Nam

61

Kỹ thuật quá trình hóa học nói chung

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Bùi Văn Đức, , Nguyễn Văn Mạnh(2), Đào Phúc Lâm(1)

Nghiên cứu tổng quan về quá trình polymer hóa và những yếu tố chính ảnh hưởng đến tính chất cơ học của đất laterit gia cố bằng geopolymer

A typical review on geopolymerization and influential factors affecting mechanical properties of laterite soils stabilized with geopolymer

Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên

2023

10

58 - 72

1859-2171

Chất kết dính Geopolymer, Gia cố vật liệu đất, Dung dịch kiềm hóa, Đất tàn tích, Tính chất cơ học

Geopolymer, Soil Stabilization, Alkali Solution, Laterite Soil, Mechanical Properties

Tại Việt Nam, trong những năm gần đây, hoạt động nghiên cứu, ứng dụng geopolymer để cải thiện tính chất cơ lý của đất nhận được khá nhiều sự quan tâm, trong đó có đất tàn tích (đất laterit). Tuy nhiên, các nghiên cứu tổng quát về quá trình polymer hóa cũng như các yếu tố ảnh hưởng đến tính chất cơ lý của đất laterit còn tương đối hạn chế. Bài báo trình bày kết quả nghiên cứu phân tích tổng quát về cơ chế polymer hóa, các yếu tố chính ảnh hưởng tính chất cơ học của vật liệu geopolymer. Cụ thể, loại hay nguồn gốc vật liệu AluminoSilicate và môi trường kiềm đóng vai trò quan trọng trong quá trình polymer hóa. Đối với việc cải thiện tính chất cơ lý của các loại đất có hàm lượng bụi lớn và rất dẻo thì ngoài việc sử dụng nồng độ dung dịch kiềm NaOH phù hợp cũng cần phải xem xét đến các yếu tố khác, như hàm lượng vật liệu AluminoSilicate, tỷ số Si/Al... Bên cạnh đó, cường độ vật liệu sử dụng geopolymer nói chung đạt giá trị tối ưu khi tỷ số Si/Al = (1,85¸2,0); tuy nhiên, một số nghiên cứu cho thấy cường độ tăng khi Si/Al ³ 2,0; do đó, cần có thêm các nghiên cứu để đánh giá đầy đủ và rõ ràng hơn về ảnh hưởng của tỷ số Si/Al.

In Vietnam, in recent years, research and application activities of geopolymer to improve the physical and mechanical properties of soil have increased, including weathered soils (laterite soils). However, critical studies on the polymerization process as well as the primary factors affecting the physico-mechanical properties of laterite soil are relatively limited. This paper presents a critical review on the polymerization mechanism, the influential factors affecting the mechanical properties of geopolymer materials. Specifically, the type or origin of AluminoSilicate materials and the alkaline environment play a vital role in the polymerization process. For the improvement of the physical and mechanical properties of soils with high clay/silt content and plasticity, beside using the appropriate sodium hydroxide (NaOH) concentration, other factors need to be considered, such as AluminoSilicate material content, Si/Al ratio. Besides, the strength of materials using geopolymer generally reaches the optimal value as the ratio Si/Al = (1.85¸2.0); yet, there are still studies showing that the strength increases even when the ratio Si/Al ³ 2.0; therefore, more studies need to be conducted to evaluate the influence of Si/Al ratio more clearly.

TTKHCNQG, CTv 178

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