Thiết kế phối trộn trong phòng thí nghiệm của hỗn hợp nhũ tương bitum lạnh có chứa nhựa đường tái chế và chủng aggregates nguyên chất
Tóm tắt
Nhũ tương bitum đường, đặc biệt là những nhũ tương kết hợp với các aggregates thứ cấp và biên, là những lựa chọn hiệu quả về năng lượng, thân thiện với môi trường và bền vững cho các hỗn hợp nhựa đường nóng. Nghiên cứu này nhằm so sánh các tính chất kỹ thuật của nhũ tương bitum nhựa đường hoàn toàn được tạo thành từ các aggregates nguyên chất với một nhũ tương bao gồm 55% nhựa đường tái chế và 45% aggregates nguyên chất. Các aggregates được kết dính bằng một nhũ tương bitum cationic chậm, bao gồm 65% bitum nền và 35% nước. Các mẫu Marshall được tạo hình tại các mức nước trước trộn và hàm lượng nhũ tương bitum khác nhau được ủ trong khuôn trong 24 giờ trước khi được lấy ra khỏi khuôn và ủ thêm 72 giờ ở 40 °C. Mật độ khô, độ rỗng và độ bền kéo gián tiếp của các mẫu đã ủ được xác định ở trạng thái khô và ngâm nước. Hỗn hợp aggregates nguyên chất, tại hàm lượng chất liên kết tối ưu 6.1%, có tỷ lệ độ bền kéo là 1.3 với các giá trị tương ứng về không gian khí và khả năng hấp thụ ẩm là 10.1% và 0.92%, tương ứng. Tương tự, hỗn hợp nhựa đường tái chế với hàm lượng chất liên kết tối ưu 6.2% có tỷ lệ độ bền kéo là 1.03, với các giá trị không gian khí và khả năng hấp thụ ẩm tương ứng là 7.9% và 0.38%, tương ứng. So với hỗn hợp nguyên chất, hỗn hợp nhựa đường tái chế có ít không gian khí hơn và giá trị hấp thụ ẩm thấp hơn với lợi ích chung là tăng cường khả năng kháng hư hỏng do ẩm.
Từ khóa
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