{"id":9256,"date":"2025-08-01T13:29:47","date_gmt":"2025-08-01T06:29:47","guid":{"rendered":"https:\/\/dufago.com.vn\/?p=9256"},"modified":"2026-06-08T16:44:43","modified_gmt":"2026-06-08T09:44:43","slug":"be-tong-mac-250-dinh-nghia-cap-phoi-ty-le-tron-va-bao-gia-moi-nhat","status":"publish","type":"post","link":"https:\/\/dufago.com.vn\/en\/be-tong-mac-250-dinh-nghia-cap-phoi-ty-le-tron-va-bao-gia-moi-nhat\/","title":{"rendered":"B\u00ea t\u00f4ng m\u00e1c 250: \u0110\u1ecbnh ngh\u0129a, c\u1ea5p ph\u1ed1i, t\u1ef7 l\u1ec7 tr\u1ed9n v\u00e0 b\u00e1o gi\u00e1 m\u1edbi nh\u1ea5t"},"content":{"rendered":"

B\u00ea t\u00f4ng m\u00e1c 250, th\u01b0\u1eddng vi\u1ebft l\u00e0 M250, l\u00e0 m\u1ed9t trong nh\u1eefng m\u00e1c b\u00ea t\u00f4ng \u0111\u01b0\u1ee3c d\u00f9ng ph\u1ed5 bi\u1ebfn trong c\u00f4ng tr\u00ecnh d\u00e2n d\u1ee5ng. V\u1edbi m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 trung b\u00ecnh – t\u1ed1t, M250 th\u01b0\u1eddng \u0111\u01b0\u1ee3c c\u00e2n nh\u1eafc cho c\u00e1c h\u1ea1ng m\u1ee5c nh\u01b0 m\u00f3ng, d\u1ea7m, s\u00e0n, c\u1ed9t, \u0111\u01b0\u1eddng n\u1ed9i b\u1ed9 ho\u1eb7c s\u00e2n b\u00e3i nh\u1eb9, t\u00f9y theo thi\u1ebft k\u1ebf k\u1ebft c\u1ea5u v\u00e0 \u0111i\u1ec1u ki\u1ec7n thi c\u00f4ng.<\/span><\/strong><\/p>\n

Tuy nhi\u00ean, kh\u00f4ng n\u00ean ch\u1ecdn m\u00e1c b\u00ea t\u00f4ng ch\u1ec9 theo th\u00f3i quen ho\u1eb7c c\u1ea3m t\u00ednh. M\u1ed9t c\u00f4ng tr\u00ecnh d\u00f9ng M250 c\u00f3 ph\u00f9 h\u1ee3p hay kh\u00f4ng c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ea3i tr\u1ecdng, n\u1ec1n \u0111\u1ea5t, nh\u1ecbp k\u1ebft c\u1ea5u, m\u1eadt \u0111\u1ed9 c\u1ed1t th\u00e9p, ph\u01b0\u01a1ng ph\u00e1p thi c\u00f4ng, \u0111\u1ed9 s\u1ee5t y\u00eau c\u1ea7u v\u00e0 ch\u1ec9 \u0111\u1ecbnh c\u1ee7a k\u1ef9 s\u01b0 thi\u1ebft k\u1ebf.<\/span><\/strong><\/p>\n

B\u00e0i vi\u1ebft n\u00e0y gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 b\u00ea t\u00f4ng m\u00e1c 250 l\u00e0 g\u00ec, c\u01b0\u1eddng \u0111\u1ed9 bao nhi\u00eau, c\u1ea5p ph\u1ed1i tham kh\u1ea3o ra sao, \u0111\u1ed9 s\u1ee5t n\u00ean ch\u1ecdn th\u1ebf n\u00e0o v\u00e0 khi n\u00e0o n\u00ean d\u00f9ng ho\u1eb7c kh\u00f4ng n\u00ean d\u00f9ng M250.<\/span><\/strong><\/p>\n

\"\"
B\u00ea t\u00f4ng m\u00e1c 250: \u0110\u1ecbnh ngh\u0129a, c\u1ea5p ph\u1ed1i, t\u1ef7 l\u1ec7 tr\u1ed9n v\u00e0 b\u00e1o gi\u00e1 m\u1edbi nh\u1ea5t<\/figcaption><\/figure>\n

What is grade 250 concrete?<\/span><\/strong><\/h2>\n

B\u00ea t\u00f4ng m\u00e1c 250 l\u00e0 lo\u1ea1i b\u00ea t\u00f4ng c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 ch\u1ecbu n\u00e9n danh ngh\u0129a 250 kg\/cm\u00b2 sau 28 ng\u00e0y b\u1ea3o d\u01b0\u1ee1ng trong \u0111i\u1ec1u ki\u1ec7n ti\u00eau chu\u1ea9n. M\u00e1c b\u00ea t\u00f4ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh th\u00f4ng qua th\u00ed nghi\u1ec7m n\u00e9n m\u1eabu b\u00ea t\u00f4ng l\u1eadp ph\u01b0\u01a1ng ti\u00eau chu\u1ea9n, th\u01b0\u1eddng c\u00f3 k\u00edch th\u01b0\u1edbc 150 x 150 x 150 mm.<\/span><\/p>\n

N\u00f3i d\u1ec5 hi\u1ec3u, con s\u1ed1 250 cho bi\u1ebft kh\u1ea3 n\u0103ng ch\u1ecbu n\u00e9n c\u1ee7a b\u00ea t\u00f4ng \u1edf tu\u1ed5i 28 ng\u00e0y theo h\u1ec7 m\u00e1c c\u0169. M\u00e1c c\u00e0ng cao th\u00ec c\u01b0\u1eddng \u0111\u1ed9 ch\u1ecbu n\u00e9n danh ngh\u0129a c\u00e0ng l\u1edbn, nh\u01b0ng \u0111i\u1ec1u \u0111\u00f3 kh\u00f4ng c\u00f3 ngh\u0129a l\u00fac n\u00e0o ch\u1ecdn m\u00e1c cao h\u01a1n c\u0169ng t\u1ed1t h\u01a1n. M\u00e1c b\u00ea t\u00f4ng ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi thi\u1ebft k\u1ebf v\u00e0 \u0111i\u1ec1u ki\u1ec7n thi c\u00f4ng.<\/span><\/p>\n

Theo b\u1ea3ng quy \u0111\u1ed5i trong TCVN 5574:2012, b\u00ea t\u00f4ng M250 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ea5p \u0111\u1ed9 b\u1ec1n B20. \u0110\u00e2y l\u00e0 nh\u00f3m b\u00ea t\u00f4ng th\u01b0\u1eddng g\u1eb7p trong c\u00f4ng tr\u00ecnh d\u00e2n d\u1ee5ng v\u00e0 m\u1ed9t s\u1ed1 h\u1ea1ng m\u1ee5c ch\u1ecbu l\u1ef1c \u1edf m\u1ee9c trung b\u00ecnh.<\/span><\/p>\n

\"\"<\/p>\n

B\u00ea t\u00f4ng m\u00e1c 250 d\u00f9ng cho h\u1ea1ng m\u1ee5c n\u00e0o?<\/span><\/strong><\/h2>\n

M250 c\u00f3 th\u1ec3 d\u00f9ng cho nhi\u1ec1u h\u1ea1ng m\u1ee5c, nh\u01b0ng c\u1ea7n hi\u1ec3u \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u1ef1a ch\u1ecdn m\u1eb7c \u0111\u1ecbnh cho m\u1ecdi c\u00f4ng tr\u00ecnh. V\u1edbi c\u00e1c h\u1ea1ng m\u1ee5c ch\u1ecbu l\u1ef1c ch\u00ednh, c\u1ea7n \u01b0u ti\u00ean h\u1ed3 s\u01a1 thi\u1ebft k\u1ebf v\u00e0 ch\u1ec9 \u0111\u1ecbnh k\u1ef9 thu\u1eadt.<\/span><\/p>\n\n\n\n\n\n\n\n\n\n
H\u1ea1ng m\u1ee5c<\/th>\nC\u00f3 th\u1ec3 d\u00f9ng M250 kh\u00f4ng?<\/th>\nGhi ch\u00fa th\u1ef1c t\u1ebf<\/th>\n<\/tr>\n
M\u00f3ng nh\u00e0 d\u00e2n d\u1ee5ng<\/td>\nC\u00f3, n\u1ebfu thi\u1ebft k\u1ebf ph\u00f9 h\u1ee3p<\/td>\nC\u1ea7n x\u00e9t n\u1ec1n \u0111\u1ea5t, t\u1ea3i tr\u1ecdng v\u00e0 lo\u1ea1i m\u00f3ng<\/td>\n<\/tr>\n
D\u1ea7m, s\u00e0n nh\u00e0 d\u00e2n d\u1ee5ng<\/td>\nC\u00f3<\/td>\nPh\u1ed5 bi\u1ebfn trong c\u00f4ng tr\u00ecnh d\u00e2n d\u1ee5ng th\u1ea5p t\u1ea7ng<\/td>\n<\/tr>\n
C\u1ed9t<\/td>\nC\u00f3 th\u1ec3<\/td>\nPh\u1ee5 thu\u1ed9c thi\u1ebft k\u1ebf k\u1ebft c\u1ea5u v\u00e0 t\u1ea3i tr\u1ecdng<\/td>\n<\/tr>\n
\u0110\u01b0\u1eddng n\u1ed9i b\u1ed9, s\u00e2n b\u00e3i nh\u1eb9<\/td>\nC\u00f3<\/td>\nC\u1ea7n x\u00e9t t\u1ea3i xe v\u00e0 \u0111i\u1ec1u ki\u1ec7n n\u1ec1n<\/td>\n<\/tr>\n
Nh\u00e0 nhi\u1ec1u t\u1ea7ng, t\u1ea3i l\u1edbn<\/td>\nC\u1ea7n c\u00e2n nh\u1eafc M300 tr\u1edf l\u00ean<\/td>\nKh\u00f4ng t\u1ef1 h\u1ea1 m\u00e1c n\u1ebfu thi\u1ebft k\u1ebf y\u00eau c\u1ea7u cao h\u01a1n<\/td>\n<\/tr>\n
C\u00f4ng tr\u00ecnh \u0111\u1eb7c bi\u1ec7t<\/td>\nKh\u00f4ng m\u1eb7c \u0111\u1ecbnh<\/td>\nC\u1ea7n ch\u1ec9 \u0111\u1ecbnh k\u1ef9 thu\u1eadt ri\u00eang<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

V\u1edbi nh\u00e0 d\u00e2n d\u1ee5ng th\u00f4ng th\u01b0\u1eddng, M250 th\u01b0\u1eddng \u0111\u01b0\u1ee3c xem l\u00e0 l\u1ef1a ch\u1ecdn c\u00e2n b\u1eb1ng gi\u1eefa c\u01b0\u1eddng \u0111\u1ed9 v\u00e0 chi ph\u00ed. Nh\u01b0ng v\u1edbi c\u00f4ng tr\u00ecnh c\u00f3 t\u1ea7ng h\u1ea7m, nh\u1ecbp l\u1edbn, t\u1ea3i tr\u1ecdng cao ho\u1eb7c k\u1ebft c\u1ea5u ph\u1ee9c t\u1ea1p, k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 ch\u1ec9 \u0111\u1ecbnh M300, M350 ho\u1eb7c m\u00e1c cao h\u01a1n.<\/span><\/p>\n

\"\"<\/p>\n

\u0110\u1ecbnh m\u1ee9c c\u1ea5p ph\u1ed1i tham kh\u1ea3o cho 1m\u00b3 b\u00ea t\u00f4ng m\u00e1c 250<\/span><\/strong><\/h2>\n

C\u1ea5p ph\u1ed1i b\u00ea t\u00f4ng l\u00e0 t\u1ef7 l\u1ec7 gi\u1eefa xi m\u0103ng, c\u00e1t, \u0111\u00e1, n\u01b0\u1edbc v\u00e0 ph\u1ee5 gia \u0111\u1ec3 t\u1ea1o ra h\u1ed7n h\u1ee3p b\u00ea t\u00f4ng \u0111\u1ea1t y\u00eau c\u1ea7u v\u1ec1 c\u01b0\u1eddng \u0111\u1ed9, \u0111\u1ed9 s\u1ee5t v\u00e0 t\u00ednh thi c\u00f4ng.<\/span><\/p>\n

B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u1ea5p ph\u1ed1i tham kh\u1ea3o cho 1m\u00b3 b\u00ea t\u00f4ng M250, \u0111\u1ed9 s\u1ee5t kho\u1ea3ng 8-12 cm, \u0111\u00e1 Dmax 20-40 mm. C\u1ea5p ph\u1ed1i th\u1ef1c t\u1ebf c\u00f3 th\u1ec3 thay \u0111\u1ed5i theo lo\u1ea1i xi m\u0103ng, ch\u1ea5t l\u01b0\u1ee3ng c\u00e1t \u0111\u00e1, \u0111\u1ed9 \u1ea9m v\u1eadt li\u1ec7u, ph\u1ee5 gia, \u0111\u1ed9 s\u1ee5t y\u00eau c\u1ea7u v\u00e0 \u0111i\u1ec1u ki\u1ec7n s\u1ea3n xu\u1ea5t.<\/span><\/p>\n

D\u00f9ng xi m\u0103ng PCB30<\/span><\/strong><\/h4>\n\n\n\n\n\n\n\n\n
V\u1eadt li\u1ec7u<\/th>\nM250 PCB40<\/th>\nGhi ch\u00fa<\/th>\n<\/tr>\n
Xi m\u0103ng PCB40<\/td>\n310-325<\/td>\nKho\u1ea3ng 6,2-6,5 bao<\/td>\n<\/tr>\n
C\u00e1t v\u00e0ng<\/td>\n0,47-0,51<\/td>\n<\/td>\n<\/tr>\n
\u0110\u00e1 d\u0103m 1×2 ho\u1eb7c 2×4<\/td>\n0,86-0,88<\/td>\nH\u1ed7n h\u1ee3p 40-70% 1×2<\/td>\n<\/tr>\n
N\u01b0\u1edbc s\u1ea1ch<\/td>\n175-185<\/td>\n<\/td>\n<\/tr>\n
Ph\u1ee5 gia<\/td>\nD\u1ebbo h\u00f3a n\u1ebfu c\u1ea7n<\/td>\nGi\u1ea3m n\u01b0\u1edbc 5-10%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

D\u00f9ng xi m\u0103ng PCB40<\/span><\/strong><\/h4>\n\n\n\n\n\n\n\n\n
V\u1eadt li\u1ec7u<\/th>\nM250 PCB30<\/th>\nGhi ch\u00fa<\/th>\n<\/tr>\n
Xi m\u0103ng PCB30<\/td>\n360-415<\/td>\nKho\u1ea3ng 7,2-8,3 bao<\/td>\n<\/tr>\n
C\u00e1t v\u00e0ng<\/td>\n0,45-0,48<\/td>\n<\/td>\n<\/tr>\n
\u0110\u00e1 d\u0103m<\/td>\n0,85-0,90<\/td>\n<\/td>\n<\/tr>\n
N\u01b0\u1edbc s\u1ea1ch<\/td>\n180-190<\/td>\n<\/td>\n<\/tr>\n
Ph\u1ee5 gia<\/td>\nD\u1ebbo h\u00f3a<\/td>\nN\u1ebfu c\u1ea7n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u0110\u1ed9 s\u1ee5t b\u00ea t\u00f4ng m\u00e1c 250 n\u00ean ch\u1ecdn bao nhi\u00eau?<\/b><\/span><\/h2>\n

\u0110\u1ed9 s\u1ee5t c\u1ee7a b\u00ea t\u00f4ng M250 kh\u00f4ng c\u00f3 m\u1ed9t con s\u1ed1 c\u1ed1 \u0111\u1ecbnh. Gi\u00e1 tr\u1ecb ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o h\u1ea1ng m\u1ee5c thi c\u00f4ng, ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ed5, m\u1eadt \u0111\u1ed9 c\u1ed1t th\u00e9p v\u00e0 y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt.<\/span><\/p>\n\n\n\n\n\n\n\n
Ph\u01b0\u01a1ng ph\u00e1p \/ h\u1ea1ng m\u1ee5c<\/th>\n\u0110\u1ed9 s\u1ee5t tham kh\u1ea3o<\/th>\n<\/tr>\n
\u0110\u1ed5 x\u1ea3 tr\u1ef1c ti\u1ebfp<\/td>\n6\u00b12 cm ho\u1eb7c 8\u00b12 cm<\/td>\n<\/tr>\n
M\u00f3ng, s\u00e0n nh\u00e0 d\u00e2n d\u1ee5ng<\/td>\n8-12 cm<\/td>\n<\/tr>\n
B\u00ea t\u00f4ng b\u01a1m<\/td>\n10\u00b12 cm ho\u1eb7c 12\u00b12 cm<\/td>\n<\/tr>\n
C\u1ea5u ki\u1ec7n nhi\u1ec1u th\u00e9p<\/td>\n12\u00b12 cm ho\u1eb7c theo t\u01b0 v\u1ea5n k\u1ef9 thu\u1eadt<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

N\u1ebfu b\u00ea t\u00f4ng qu\u00e1 kh\u00f4, qu\u00e1 tr\u00ecnh \u0111\u1ea7m v\u00e0 l\u1ea5p \u0111\u1ea7y quanh c\u1ed1t th\u00e9p s\u1ebd kh\u00f3 h\u01a1n. N\u1ebfu b\u00ea t\u00f4ng qu\u00e1 nh\u00e3o, \u0111\u1eb7c bi\u1ec7t do t\u1ef1 \u00fd th\u00eam n\u01b0\u1edbc t\u1ea1i c\u00f4ng tr\u01b0\u1eddng, c\u00f3 th\u1ec3 t\u0103ng nguy c\u01a1 ph\u00e2n t\u1ea7ng, t\u00e1ch n\u01b0\u1edbc v\u00e0 gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng b\u00ea t\u00f4ng.<\/span><\/p>\n

B\u1ea1n c\u00f3 th\u1ec3 xem th\u00eam b\u00e0i h\u01b0\u1edbng d\u1eabn v\u1ec1 \u0111\u1ed9 s\u1ee5t b\u00ea t\u00f4ng<\/span><\/strong><\/a> \u0111\u1ec3 hi\u1ec3u c\u00e1ch ch\u1ecdn \u0111\u1ed9 s\u1ee5t theo t\u1eebng h\u1ea1ng m\u1ee5c v\u00e0 c\u00e1ch ki\u1ec3m tra t\u1ea1i c\u00f4ng tr\u01b0\u1eddng.<\/span><\/p>\n

C\u01b0\u1eddng \u0111\u1ed9 ch\u1ecbu n\u00e9n v\u00e0 th\u1eddi gian \u0111\u00f4ng k\u1ebft b\u00ea t\u00f4ng m\u00e1c 250<\/b><\/span><\/h2>\n

\u0110\u00e2y l\u00e0 m\u1ed9t m\u00e1c b\u00ea t\u00f4ng<\/a><\/strong> ph\u1ed5 bi\u1ebfn, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c h\u1ea1ng m\u1ee5c ch\u1ecbu l\u1ef1c ch\u00ednh c\u1ee7a c\u00f4ng tr\u00ecnh d\u00e2n d\u1ee5ng v\u00e0 c\u00f4ng nghi\u1ec7p c\u00f3 t\u1ea3i tr\u1ecdng trung b\u00ecnh nh\u01b0: m\u00f3ng, c\u1ed9t, d\u1ea7m, s\u00e0n.<\/span><\/p>\n

M250 ngh\u0129a l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 ch\u1ecbu n\u00e9n t\u1ed1i thi\u1ec3u c\u1ee7a m\u1eabu b\u00ea t\u00f4ng h\u00ecnh l\u1eadp ph\u01b0\u01a1ng k\u00edch th\u01b0\u1edbc 15\u00d715\u00d715cm \u0111\u1ea1t 250kg\/cm2 (t\u01b0\u01a1ng \u0111\u01b0\u01a1ng 25MPa – Megapascal) sau 28 ng\u00e0y.<\/span><\/p>\n

Quy \u0111\u1ed5i sang C\u1ea5p \u0111\u1ed9 b\u1ec1n (B) theo ti\u00eau chu\u1ea9n hi\u1ec7n h\u00e0nh (TCVN 5574:2018): B\u00ea t\u00f4ng m\u00e1c M250 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi c\u1ea5p \u0111\u1ed9 b\u1ec1n B20, trong \u0111\u00f3 B20 l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 \u0111\u1eb7c tr\u01b0ng ch\u1ecbu n\u00e9n 20MPa (v\u1edbi x\u00e1c su\u1ea5t \u0111\u1ea3m b\u1ea3o 0.95).<\/span><\/p>\n

C\u01b0\u1eddng \u0111\u1ed9 b\u00ea t\u00f4ng d\u1ea7n theo th\u1eddi gian:<\/span><\/p>\n