Ảnh hưởng của phế thải gốm sứ nghiền mịn đến các tính chất của chất kết dính xi măng=Influence of ground sanitary ware waste on cementitious binder properties

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Tác giả: Trọng Tráng Đào, Hoàng Minh Anh Nguyễn, Thị Vinh Lanh Phạm, Tôn Kiên Tống

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học công nghệ xây dựng (Đại học Xây dựng Hà Nội), 2024

Mô tả vật lý: tr.137-149

Bộ sưu tập: Metadata

ID: 228906

Thêm vào giỏ

Nghiên cứu này đánh giá khả năng sử dụng bột gốm sứ (BGS) được nghiền mịn từ phế thải gốm sứ và thiết bị vệ sinh trong sản xuất xi măng. Các quy luật ảnh hưởng của hàm lượng 10, 20, và 30% bột gốm sứ đến các tính chất của chất kết dính (CKD) xi măng hỗn hợp đã được phân tích. Mặc dù bột gốm sứ có hình dạng không đều và các cạnh sắc, nhưng bề mặt thủy tinh, độ rỗng xốp thấp và khá trơ về hóa học nên bột gốm sứ làm tăng nhẹ 3,2-4,8% lượng nước tiêu chuẩn, giảm 11,4-27,7% độ nhớt và kéo dài thời gian đông kết của hồ CKD. Kết quả nghiên cứu cho thấy bột gốm sứ hoàn toàn có thể sử dụng làm phụ gia khoáng hoạt tính cho xi măng do chỉ số hoạt tính cường độ ở tuổi 7 và 28 ngày đều đạt lớn hơn 75% theo TCVN 6882:2016. Độ hút nước của mẫu vữa tiêu chuẩn tăng 40,4-53,2% khi sử dụng bột gốm sứ thay thế xi măng từ 10-30%. Còn độ hút nước mao quản sau 24 giờ tăng 10,8% ở tỷ lệ thay thế 10%
nhưng lại giảm 10,8-16,9% khi tỷ lệ thay thế 20-30%. Điều này chứng tỏ, tùy thuộc vào hàm lượng thay thế, BGS có thể hạn chế hình thành lỗ rỗng mao quản và giảm kích thước lỗ rỗng nhờ vào hiệu ứng lấp đầy và các sản phẩm phản ứng puzơlan.This study evaluated the possibility of using finely ground sanitary ware powder (SWP) from ceramic waste and sanitary ware in cement production. The influence of 10, 20, and 30% SWP on blended cement properties were analysed. Although SWP has an irregular shape and sharp edges, its glassy surface, low porosity and chemical inertness allow SWP to slightly increase the standard water content by 3.2-4.8%, reduce the viscosity by 11.4-27.7% and prolong the setting time of the binder paste. The results show that SWP can be completely used as an active mineral additive for cement because the strength activity index at 7 and 28 days is greater than 75% following TCVN 6882:2016. The water absorption increased by 40.4-53.2% in mortar samples containing 10-30% SWP-replaced cement. The capillary water absorption after 24 hours increased by 10.8% at a 10% replacement rate
but decreased by 10.8-16.9% at a replacement rate of 20-30%. This demonstrates that, depending on the replacement content, SWP can limit the formation of capillary pores and reduce pore diameter thanks to the filling effect and pozzolanic reaction products.

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