ĐÁNH GIÁ KHẢ NĂNG XỬ LÝ TÍNH THẤM ĐỐI VỚI CỐT LIỆU BÊ TÔNG CŨ CỦA VI KHUẨN TẠO KẾT TỦA CALCITE PHÂN LẬP TẠI VIỆT NAM

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Tác giả: Thị Hồng Đào Dương, Quỳnh Loan Lê, Hoàng Dũng Nguyễn, Văn Dân Phan, Bình Tân Trần, Thị Mỹ Ngọc Trần, Trung Kiên Trần, Thị Tuyết Nhung Vũ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Đại học Công Thương (Tên cũ: Tạp chí Khoa học Công nghệ và Thực phẩm), 2024

Mô tả vật lý: tr.29

Bộ sưu tập: Metadata

ID: 479852

Thêm vào giỏ

Kết tủa calcite do vi sinh vật (Microbially Induced Carbonate Precipitation - MICP) là một hướng tiếp cận mới cho các ứng dụng thực tiễn. Mục tiêu nhằm cải thiện tính chất của cốt liệu bê tông cũ (Recycled Aggregate Concrete - RAC), tái sử dụng cũng như giải quyết các vấn đề nghiêm trọng mang tính toàn cầu như thảm họa chất thải xây dựng và các vấn đề ô nhiễm môi trường ngày càng tăng. Trong nghiên cứu này, trọng tâm chính là đánh giá khả năng xử lý tính thấm đối với cốt liệu bê tông cũ RAC của vi sinh vật, chủ yếu là quy trình xử lý MICP theo con đường thủy phân urease nhằm nâng cao chất lượng và tính ứng dụng của RAC. Đồng thời, xác định tính hiệu quả của quy trình xử lý MICP được đề xuất và đánh giá mức độ cải thiện đặc tính xử lý tính thấm của cốt liệu tái chế. Sau khi thực hiện quy trình xử lý MICP, bổ sung nguồn Ca2+, lặp lại 3 chu kỳ với thời gian xử lý mỗi chu kỳ là 24 giờ, đánh giá cấu trúc lỗ rỗng với cấp độ vi mô. Kết quả cho thấy, hoạt tính enzyme urease tỷ lệ thuận với khả năng tạo kết tủa calcite, tương quan với khả năng cải thiện tính thấm của chủng vi khuẩn Bacillus thuringiensis QN_7 (B. thuringiensis QN_7) với RAC thông qua sự tăng về khối lượng 13,04% và làm giảm tính thấm nước 43,15% so với mẫu đối chứng.Microbially Induced Carbonate Precipitation (MICP) is recently viewed as one of the approaches for field applications. The goal is to improve the properties of recycled aggregate concrete (RAC), reuse them as well as solve serious global problems such as construction waste, dwindling natural resources, and environmental pollution problems. Typically, the bacteria involved in MICP create urease, causing calcite crystals to form on the surface of grains forming cementation bonds between particles that help in reducing soil permeability and increase overall compressive strength. In this study, the main focus is on assessing the microbial permeability treatment ability of RAC, mainly the MICP treatment process by urease hydrolysis to improve the quality and application of RAC. In addition, the effectiveness of the proposed MICP treatment was determined and the degree of improvement in the permeability treatment properties of the recycled aggregate was evaluated. After performing the MICP treatment, adding Ca2+ sources, repeating 3 cycles with a processing time of 24 hours each, evaluating the pore structure at the microscopic level. The results showed that the enzyme activity of urease was directly proportional to the ability to precipitate calcite, which correlated with the ability to improve the permeability of Bacillus thuringiensis strain to RAC through an increase in weight of 13.04% and a decrease in the 43.15% water absorption compared to the control sample.

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