Cát vàng trộn bê tông có thể có nguồn gốc từ tự nhiên hay nhân tạo. Thành phần khoáng chất, cấu tạo hạt, hàm lượng tạp chất có trong cát sẽ quyết định đến chất lượng cát vàng. Nhưng yêu cầu bắt buộc đối với loại vật liệu này đó là phải sạch, hạt phải đều, hình tròn không lẫn tạp chất.
Cát vàng để trộn bê tông tươi và yêu cầu kỹ thuật
Độ lớn hạt cát
- Độ lớn hạt cát được xác định bằng cách sàng cát qua lỗ sàng tiêu chuẩn, với các kích thước mắt sàng 5; 2,5; 1,25; 0,63; 0,315; 0,14.
- Không được sử dụng các hạt có kích thước lớn hơn 10mm.
- Hạt có kích thước 5-10mm không được lớn hơn 5%.
- Nếu cát to có thể có độ rỗng lớn, cần phải lấp đầy chúng bằng hồ xi măng. Vì vậy sẽ tăng giá thành của bê tông.
- Vì vậy nên sử dụng cát có kích thước tiêu chuẩn, từ 1,5-3mm là hợp lý nhất, hay còn gọi là cát vàng đẹp cho việc đổ bê tông.
Độ sạch cát vàng trong bê tông
- Hàm lượng các tạp chất sét, bụi và bùn được xác định bằng cách rửa, không được vượt quá 3% khối lượng. Đất sét là hàm lượng có hại nhất, chúng đọng lại trên bề mặt hạt cát làm ngăn cản cát liên kết với đá xi măng.
- Vì thế cần phải rửa sạch cát bằng nước.
- Các tạp chất hữu cơ như đất mùn, cho phép với một hàm lượng rất nhỏ, bởi vì chúng sẽ làm giảm cường độ và phá hoại xi măng.
- Yêu cầu cát sạch trong quá trình sản xuất bê tông tươi cát vàng. Vì như chúng ta đã biết những tác hại của các tạp chất lẫn vào, làm cho chất lượng của hỗn hợp không đảm bảo. Và nó sẽ ảnh hưởng cả đến chất lượng công trình xây dựng của bạn.
Bê Tông Tươi Cát Vàng
Để biết thêm tư vấn về bê tông tươi cát vàng xin vui lòng liên hệ: 0985.39.8686
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