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Hỏi đáp Luật Xây Dựng

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Hỏi đáp Luật Xây Dựng

Hiện nay chúng tôi đang tiến hành kiểm định chất lượng bê tông một bể chứa bằng bê tông cốt thép (Mác bê tông thiết kế 300 daN/cm2, cốt liệu chế tạo bê tông là đá dăm có cốt liệu hạt lớn nhất 20mm) và đã có số liệu về cường độ bê tông tại hiện trường sau khi tiến hành khoan lấy mẫu, xử lý mẫu, thí nghiệm và tính toán như sau:

+ Rht = 25.2 N/mm2

+ Rmin = 21.5 N/mm2

Để đưa ra kết luận đánh giá cường độ bê tông hiện trường có đạt yêu cầu theo Mác thiết kế đưa ra thì có rất nhiều kiến nghị đưa ra phương pháp so sánh đánh giá như sau:

+ Đơn vị kiểm định:

Rht > 0.9M = 0.9*30 = 27 N/mm2 và

Rmin > 0.75M = 0.75 * 30 = 22.5 N/mm2

+ Đơn vị chủ đầu tư:

Rht > M = 30 N/mm2

+ Đơn vị cung cấp Bê tông và đơn vị thi công: theo TCXDVN 239-2006

Rht > 0.9 Rye

Rmin > 0.75 Rye

Trong đó Rye = B hoặc 0.778M (Theo cấp hoặc Mác bê tông).

Vì vậy để đánh giá được bê tông có đạt được theo yêu cầu của Mác thiết kế là 300daN/cm2 thì cách so sánh như thế nào là chính xác hoặc có tiêu chuẩn nào khác để đánh giá không?