{"id":300,"date":"2020-07-29T07:47:19","date_gmt":"2020-07-29T07:47:19","guid":{"rendered":"http:\/\/anhsinhbinhdinh.com.vn\/wp\/?p=300"},"modified":"2020-10-24T12:45:14","modified_gmt":"2020-10-24T12:45:14","slug":"da-dam-1x2","status":"publish","type":"post","link":"https:\/\/anhsinhbinhdinh.com.vn\/?p=300","title":{"rendered":"\u0110\u00e1 d\u0103m x\u00e2y d\u1ef1ng cho b\u00ea t\u00f4ng v\u00e0 v\u1eefa th\u00f4ng th\u01b0\u1eddng"},"content":{"rendered":"\n
B\u00ea t\u00f4ng v\u00e0 v\u1eefa l\u00e0 h\u1ed7n h\u1ee3p k\u1ebft d\u00ednh v\u00e0 t\u1ea1o h\u00ecnh c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c kh\u00f4ng th\u1ec3 thi\u1ebfu trong c\u00f4ng t\u00e1c x\u00e2y d\u1ef1ng. Ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a b\u00ea t\u00f4ng v\u00e0 v\u1eefa ph\u1ee5 thu\u1ed9c r\u1ea5t l\u1edbn v\u00e0o c\u00e1c th\u00e0nh ph\u1ea7n c\u1ea5u t\u1ea1o n\u00ean ch\u00fang. \u0110\u00e1 d\u0103m x\u00e2y d\u1ef1ng (c\u1ed1t li\u1ec7u l\u1edbn) \u0111\u01b0\u1ee3c cung c\u1ea5p d\u01b0\u1edbi d\u1ea1ng h\u1ed7n h\u1ee3p nhi\u1ec1u c\u1ee1 h\u1ea1t ho\u1eb7c c\u00e1c c\u1ee1 h\u1ea1t ri\u00eang bi\u1ec7t\u00a0d\u00f9ng cho ph\u1ed1i tr\u1ed9n b\u00ea t\u00f4ng v\u00e0 v\u1eefa. Ch\u00ednh v\u00ec v\u1eady, vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111\u00fang c\u00e1c lo\u1ea1i \u0111\u00e1 \u0111\u1ea1t chu\u1ea9n l\u00e0 m\u1ed9t vi\u1ec7c v\u00f4 c\u00f9ng quan tr\u1ecdng.<\/h6>\n\n\n\n
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\u0110\u00e1 d\u0103m x\u00e2y d\u1ef1ng \u0111\u01b0\u1ee3c ch\u1ebf bi\u1ebfn qua c\u00f4ng ngh\u1ec7 nghi\u1ec1n s\u00e0n<\/figcaption><\/figure><\/div>\n\n\n\n

<\/p>\n\n\n\n

Theo TCVN 7570:2006 d\u00e0nh cho b\u00ea t\u00f4ng v\u00e0 v\u1eefa xi m\u0103ng th\u00f4ng th\u01b0\u1eddng<\/strong>,\u00a0\u0111\u00e1 d\u0103m x\u00e2y d\u1ef1ng c\u1ea7n d\u00f9ng c\u1ea7n \u0111\u00e1p \u1ee9ng nh\u1eefng ti\u00eau chu\u1ea9n sau:<\/p>\n\n\n\n

  1. Th\u00e0nh ph\u1ea7n h\u1ea1t c\u1ee7a c\u1ed1t li\u1ec7u l\u1edbn<\/li><\/ol>\n\n\n\n
    K\u00edch th\u01b0\u1edbc l\u1ed7 s\u00e0ng (mm)<\/strong><\/td>5-10<\/strong> (*)<\/td>5-20<\/strong> (*)<\/td>5-40<\/strong> (*)<\/td>5-70<\/strong> (*)<\/td>10-40<\/strong> (*)<\/td>10-70<\/strong> (*)<\/td>20-70<\/strong> (*)<\/td><\/tr>
    100<\/strong><\/td>–<\/td>–<\/td>–<\/td>0<\/td>–<\/td>0<\/td>0<\/td><\/tr>
    70<\/strong><\/td>–<\/td>–<\/td>0<\/td>0-10<\/td>0<\/td>0-10<\/td>0-10<\/td><\/tr>
    40<\/strong><\/td>–<\/td>–<\/td>0-10<\/td>40-70<\/td>0-10<\/td>40-70<\/td>40-70<\/td><\/tr>
    20<\/strong><\/td>0<\/td>0-10<\/td>40-70<\/td>…<\/td>40-70<\/td>…<\/td>90-100<\/td><\/tr>
    10<\/strong><\/td>0-10<\/td>40-70<\/td>…<\/td>…<\/td>90-100<\/td>90-100<\/td>–<\/td><\/tr>
    5<\/strong><\/td>90-100<\/td>90-100<\/td>90-100<\/td>90-100<\/td>–<\/td>–<\/td>–<\/td><\/tr><\/tbody><\/table>
    (*) T\u00ednh theo L\u01b0\u1ee3ng s\u00f3t t\u00edch l\u0169y tr\u00ean s\u00e0ng, % kh\u1ed1i l\u01b0\u1ee3ng, \u1ee9ng v\u1edbi k\u00edch th\u01b0\u1edbc h\u1ea1t li\u1ec7u nh\u1ecf nh\u1ea5t v\u00e0 l\u1edbn nh\u1ea5t, <\/strong>(mm)<\/figcaption><\/figure>\n\n\n\n

    2.  H\u00e0m l\u01b0\u1ee3ng b\u00f9n, b\u1ee5i, s\u00e9t trong c\u1ed1t li\u1ec7u l\u1edbn<\/strong><\/p>\n\n\n\n

    Tu\u1ef3 theo c\u1ea5p b\u00ea t\u00f4ng kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 gi\u00e1 tr\u1ecb quy \u0111\u1ecbnh trong B\u1ea3ng 2.<\/p>\n\n\n\n

    C\u1ea5p b\u00ea t\u00f4ng<\/strong><\/td>H\u00e0m l\u01b0\u1ee3ng b\u00f9n, b\u1ee5i, s\u00e9t, <\/strong>% kh\u1ed1i l\u01b0\u1ee3ng, kh\u00f4ng l\u1edbn h\u01a1n<\/td><\/tr>
    Cao h\u01a1n B30<\/td>1,0<\/td><\/tr>
    T\u1eeb B15 \u0111\u1ebfn B30<\/td>2,0<\/td><\/tr>
    Th\u1ea5p h\u01a1n B15<\/td>3,0<\/td><\/tr><\/tbody><\/table>
    B\u1ea3ng 2 – H\u00e0m l\u01b0\u1ee3ng b\u00f9n, b\u1ee5i, s\u00e9t trong c\u1ed1t li\u1ec7u l\u1edbn<\/strong><\/figcaption><\/figure>\n\n\n\n
    \n

    3. C\u01b0\u1eddng \u0111\u1ed9 tr\u00ean m\u1eabu \u0111\u00e1 nguy\u00ean khai<\/strong><\/p>\n<\/div><\/div>\n\n\n\n

    \n

    \u0110\u00e1 l\u00e0m c\u1ed1t li\u1ec7u l\u1edbn cho b\u00ea t\u00f4ng ph\u1ea3i c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 th\u1eed tr\u00ean m\u1eabu \u0111\u00e1 nguy\u00ean khai ho\u1eb7c m\u00e1c x\u00e1c \u0111\u1ecbnh th\u00f4ng qua gi\u00e1 tr\u1ecb \u0111\u1ed9 n\u00e9n d\u1eadp trong xi lanh l\u1edbn h\u01a1n 2 l\u1ea7n c\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 ch\u1ecbu n\u00e9n c\u1ee7a b\u00ea t\u00f4ng khi d\u00f9ng \u0111\u00e1 g\u1ed1c ph\u00fan xu\u1ea5t, bi\u1ebfn ch\u1ea5t; l\u1edbn h\u01a1n 1,5 l\u1ea7n c\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 ch\u1ecbu n\u00e9n c\u1ee7a b\u00ea t\u00f4ng khi d\u00f9ng \u0111\u00e1 g\u1ed1c tr\u1ea7m t\u00edch.<\/p>\n<\/div><\/div>\n\n\n\n

    \n

    M\u00e1c \u0111\u00e1 d\u0103m x\u00e2y d\u1ef1ng x\u00e1c \u0111\u1ecbnh theo gi\u00e1 tr\u1ecb \u0111\u1ed9 n\u00e9n d\u1eadp trong xi lanh \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh trong B\u1ea3ng 3.<\/p>\n<\/div><\/div>\n\n\n\n

    B\u1ea3ng 3 – M\u00e1c c\u1ee7a \u0111\u00e1 d\u0103m t\u1eeb \u0111\u00e1 thi\u00ean nhi\u00ean theo \u0111\u1ed9 n\u00e9n d\u1eadp<\/strong><\/p>\n\n\n\n

    \n
    \n
    M\u00e1c \u0111\u00e1 d\u0103m (*)<\/th><\/th>\u0110\u1ed9 n\u00e9n d\u1eadp trong xi lanh \u1edf tr\u1ea1ng th\u00e1i b\u00e3o ho\u00e0 n\u01b0\u1edbc, <\/strong>% kh\u1ed1i l\u01b0\u1ee3ng<\/th><\/th><\/tr><\/thead>
    <\/td>\u0110\u00e1 tr\u1ea7m t\u00edch<\/strong><\/td>\u0110\u00e1 ph\u00fan xu\u1ea5t x\u00e2m nh\u1eadp v\u00e0 \u0111\u00e1 bi\u1ebfn ch\u1ea5t<\/strong><\/td>\u0110\u00e1 ph\u00fan xu\u1ea5t phun tr\u00e0o<\/strong><\/td><\/tr>
    140<\/td>–<\/td>\u0110\u1ebfn 12<\/td>\u0110\u1ebfn 9<\/td><\/tr>
    120<\/td>\u0110\u1ebfn 11<\/td>L\u1edbn h\u01a1n 12 \u0111\u1ebfn 16<\/td>L\u1edbn h\u01a1n 9 \u0111\u1ebfn 11<\/td><\/tr>
    100<\/td>L\u1edbn h\u01a1n 11 \u0111\u1ebfn 13<\/td>L\u1edbn h\u01a1n 16 \u0111\u1ebfn 20<\/td>L\u1edbn h\u01a1n 11 \u0111\u1ebfn 13<\/td><\/tr>
    80<\/td>L\u1edbn h\u01a1n 13 \u0111\u1ebfn 15<\/td>L\u1edbn h\u01a1n 20 \u0111\u1ebfn 25<\/td>L\u1edbn h\u01a1n 13 \u0111\u1ebfn 15<\/td><\/tr>
    60<\/td>L\u1edbn h\u01a1n 15 \u0111\u1ebfn 20<\/td>L\u1edbn h\u01a1n 25 \u0111\u1ebfn 34<\/td>–<\/td><\/tr>
    40<\/td>L\u1edbn h\u01a1n 20 \u0111\u1ebfn 28<\/td>–<\/td>–<\/td><\/tr>
    30<\/td>L\u1edbn h\u01a1n 28 \u0111\u1ebfn 38<\/td>–<\/td>–<\/td><\/tr>
    20<\/td>L\u1edbn h\u01a1n 38 \u0111\u1ebfn 54<\/td>–<\/td>–<\/td><\/tr><\/tbody><\/table>
    * Ch\u1ec9 s\u1ed1 m\u00e1c \u0111\u00e1 d\u0103m x\u00e1c \u0111\u1ecbnh theo c\u01b0\u1eddng \u0111\u1ed9 ch\u1ecbu n\u00e9n, t\u00ednh b\u1eb1ng MPa t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb 1 400; 1 200; …; 200 khi c\u01b0\u1eddng \u0111\u1ed9 ch\u1ecbu n\u00e9n t\u00ednh b\u1eb1ng kG\/cm2<\/sup>.<\/figcaption><\/figure>\n\n\n\n

    4. \u0110\u1ed9 n\u00e9n d\u1eadp xi lanh<\/strong><\/p>\n\n\n\n

    C\u1ea5p b\u00ea t\u00f4ng<\/strong><\/td>S\u1ecfi<\/strong> (\u0110\u01a1n v\u1ecb kh\u00f4ng l\u1edbn h\u01a1n)<\/td>S\u1ecfi d\u0103m<\/strong> (\u0110\u01a1n v\u1ecb kh\u00f4ng l\u1edbn h\u01a1n)<\/td><\/tr>
    Cao h\u01a1n B25<\/td>8<\/td>10<\/td><\/tr>
    T\u1eeb B15 \u0111\u1ebfn B25<\/td>12<\/td>14<\/td><\/tr>
    Th\u1ea5p h\u01a1n B15<\/td>16<\/td>18<\/td><\/tr><\/tbody><\/table>
    (*) Ch\u1ec9 s\u1ed1 \u0110\u1ed9 n\u00e9n d\u1eadp \u1edf tr\u1ea1ng th\u00e1i b\u00e3o ho\u00e0 n\u01b0\u1edbc<\/strong>,% kh\u1ed1i l\u01b0\u1ee3ng<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n

    <\/p>\n<\/div><\/div>\n\n\n\n

    \n
    <\/div><\/div>\n\n\n\n

    <\/p>\n<\/div><\/div>\n\n\n\n

    5. <\/strong>\u0110\u1ed9 hao m\u00f2n khi va \u0111\u1eadp c\u1ee7a c\u1ed1t li\u1ec7u l\u1edbn th\u00ed nghi\u1ec7m trong m\u00e1y Los Angeles, kh\u00f4ng l\u1edbn h\u01a1n 50 % kh\u1ed1i l\u01b0\u1ee3ng.<\/p>\n\n\n\n

    6. <\/strong> H\u00e0m l\u01b0\u1ee3ng h\u1ea1t thoi d\u1eb9t trong c\u1ed1t li\u1ec7u l\u1edbn kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 15 % \u0111\u1ed1i v\u1edbi b\u00ea t\u00f4ng c\u1ea5p cao h\u01a1n B30 v\u00e0 kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 35 % \u0111\u1ed1i v\u1edbi c\u1ea5p B30 v\u00e0 th\u1ea5p h\u01a1n.<\/p>\n\n\n\n

    7. <\/strong> T\u1ea1p ch\u1ea5t h\u1eefu c\u01a1 trong s\u1ecfi x\u00e1c \u0111\u1ecbnh theo ph\u01b0\u01a1ng ph\u00e1p so m\u00e0u, kh\u00f4ng th\u1eabm h\u01a1n m\u00e0u chu\u1ea9n. S\u1ecfi ch\u1ee9a l\u01b0\u1ee3ng t\u1ea1p ch\u1ea5t h\u1eefu c\u01a1 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi quy \u0111\u1ecbnh tr\u00ean v\u1eabn c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng n\u1ebfu k\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m ki\u1ec3m ch\u1ee9ng trong b\u00ea t\u00f4ng cho th\u1ea5y l\u01b0\u1ee3ng t\u1ea1p ch\u1ea5t h\u1eefu c\u01a1 n\u00e0y kh\u00f4ng l\u00e0m gi\u1ea3m c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 l\u00fd y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi b\u00ea t\u00f4ng c\u1ee5 th\u1ec3.<\/p>\n\n\n\n

    8. <\/strong> H\u00e0m l\u01b0\u1ee3ng ion Cl–<\/sup> (tan trong axit) trong c\u1ed1t li\u1ec7u l\u1edbn, kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 0,01 %. C\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u1ed1t li\u1ec7u l\u1edbn c\u00f3 h\u00e0m l\u01b0\u1ee3ng ion Cl–<\/sup> l\u1edbn h\u01a1n 0,01 % n\u1ebfu t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng ion Cl—<\/sup> trong 1 m3<\/sup> b\u00ea t\u00f4ng kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 0,6 kg.<\/p>\n\n\n\n

    9. <\/strong> Kh\u1ea3 n\u0103ng ph\u1ea3n \u1ee9ng ki\u1ec1m – silic \u0111\u1ed1i v\u1edbi c\u1ed1t li\u1ec7u l\u1edbn \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh nh\u01b0 \u0111\u1ed1i v\u1edbi c\u1ed1t li\u1ec7u nh\u1ecf ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra theo ph\u01b0\u01a1ng ph\u00e1p ho\u00e1 h\u1ecdc (TCVN 7572-14 : 2006) ph\u1ea3i n\u1eb1m trong v\u00f9ng c\u1ed1t li\u1ec7u v\u00f4 h\u1ea1i. Khi kh\u1ea3 n\u0103ng ph\u1ea3n \u1ee9ng ki\u1ec1m – silic c\u1ee7a c\u1ed1t li\u1ec7u ki\u1ec3m tra n\u1eb1m trong v\u00f9ng c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y h\u1ea1i th\u00ec c\u1ea7n th\u00ed nghi\u1ec7m ki\u1ec3m tra b\u1ed5 xung theo ph\u01b0\u01a1ng ph\u00e1p thanh v\u1eefa (TCVN 7572-14 : 2006) \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1eafc ch\u1eafn v\u00f4 h\u1ea1i..<\/p>\n\n\n\n

    (Theo TCVN 7570:2006<\/strong><\/a>)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

    B\u00ea t\u00f4ng v\u00e0 v\u1eefa l\u00e0 h\u1ed7n h\u1ee3p k\u1ebft d\u00ednh v\u00e0 t\u1ea1o h\u00ecnh c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c kh\u00f4ng th\u1ec3 thi\u1ebfu trong c\u00f4ng t\u00e1c x\u00e2y d\u1ef1ng. Ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a b\u00ea t\u00f4ng v\u00e0 v\u1eefa ph\u1ee5 thu\u1ed9c r\u1ea5t l\u1edbn v\u00e0o c\u00e1c th\u00e0nh ph\u1ea7n c\u1ea5u t\u1ea1o n\u00ean ch\u00fang. \u0110\u00e1 d\u0103m x\u00e2y d\u1ef1ng (c\u1ed1t li\u1ec7u l\u1edbn) \u0111\u01b0\u1ee3c cung c\u1ea5p d\u01b0\u1edbi d\u1ea1ng h\u1ed7n h\u1ee3p nhi\u1ec1u c\u1ee1 h\u1ea1t ho\u1eb7c c\u00e1c c\u1ee1 h\u1ea1t ri\u00eang bi\u1ec7t\u00a0d\u00f9ng cho ph\u1ed1i tr\u1ed9n b\u00ea t\u00f4ng v\u00e0 v\u1eefa. Ch\u00ednh v\u00ec v\u1eady, vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111\u00fang c\u00e1c lo\u1ea1i \u0111\u00e1 \u0111\u1ea1t chu\u1ea9n l\u00e0 m\u1ed9t vi\u1ec7c v\u00f4 c\u00f9ng quan tr\u1ecdng. Theo TCVN 7570:2006 d\u00e0nh cho b\u00ea t\u00f4ng v\u00e0 v\u1eefa xi m\u0103ng th\u00f4ng th\u01b0\u1eddng,\u00a0\u0111\u00e1 d\u0103m x\u00e2y d\u1ef1ng c\u1ea7n d\u00f9ng c\u1ea7n \u0111\u00e1p \u1ee9ng nh\u1eefng ti\u00eau chu\u1ea9n sau: Th\u00e0nh ph\u1ea7n h\u1ea1t c\u1ee7a c\u1ed1t li\u1ec7u l\u1edbn K\u00edch th\u01b0\u1edbc l\u1ed7 s\u00e0ng (mm) 5-10 (*) 5-20 (*) 5-40 (*) 5-70 (*) 10-40 (*) 10-70 (*) 20-70 (*) 100 – – – 0 – 0 0 70 – – 0 0-10 0 0-10 0-10 40 – – 0-10 40-70 0-10 40-70 40-70 20 0 0-10 40-70 … 40-70 … 90-100 10 0-10 40-70 … … 90-100 90-100 – 5 90-100 90-100 90-100 90-100 – – – (*) T\u00ednh theo L\u01b0\u1ee3ng s\u00f3t t\u00edch l\u0169y tr\u00ean s\u00e0ng, % kh\u1ed1i l\u01b0\u1ee3ng, \u1ee9ng v\u1edbi k\u00edch th\u01b0\u1edbc h\u1ea1t li\u1ec7u nh\u1ecf nh\u1ea5t v\u00e0 l\u1edbn nh\u1ea5t, (mm) 2.  H\u00e0m l\u01b0\u1ee3ng b\u00f9n, b\u1ee5i, s\u00e9t trong c\u1ed1t li\u1ec7u l\u1edbn Tu\u1ef3 theo c\u1ea5p b\u00ea t\u00f4ng kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 gi\u00e1 tr\u1ecb quy \u0111\u1ecbnh trong B\u1ea3ng 2. C\u1ea5p b\u00ea t\u00f4ng H\u00e0m l\u01b0\u1ee3ng b\u00f9n, b\u1ee5i, s\u00e9t, % kh\u1ed1i l\u01b0\u1ee3ng, kh\u00f4ng l\u1edbn h\u01a1n Cao h\u01a1n B30 1,0 T\u1eeb B15 \u0111\u1ebfn B30 2,0 Th\u1ea5p h\u01a1n B15 3,0 B\u1ea3ng 2 – H\u00e0m l\u01b0\u1ee3ng b\u00f9n, b\u1ee5i, s\u00e9t trong c\u1ed1t li\u1ec7u l\u1edbn B\u1ea3ng 3 – M\u00e1c c\u1ee7a \u0111\u00e1 d\u0103m t\u1eeb \u0111\u00e1 thi\u00ean nhi\u00ean theo \u0111\u1ed9 n\u00e9n d\u1eadp 5. \u0110\u1ed9 hao m\u00f2n khi va \u0111\u1eadp c\u1ee7a c\u1ed1t li\u1ec7u l\u1edbn th\u00ed nghi\u1ec7m trong m\u00e1y Los Angeles, kh\u00f4ng l\u1edbn h\u01a1n 50 % kh\u1ed1i l\u01b0\u1ee3ng. 6.  H\u00e0m l\u01b0\u1ee3ng h\u1ea1t thoi d\u1eb9t trong c\u1ed1t li\u1ec7u l\u1edbn kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 15 % \u0111\u1ed1i v\u1edbi b\u00ea t\u00f4ng c\u1ea5p cao h\u01a1n B30 v\u00e0 kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 35 % \u0111\u1ed1i v\u1edbi c\u1ea5p B30 v\u00e0 th\u1ea5p h\u01a1n. 7.  T\u1ea1p ch\u1ea5t h\u1eefu c\u01a1 trong s\u1ecfi x\u00e1c \u0111\u1ecbnh theo ph\u01b0\u01a1ng ph\u00e1p so m\u00e0u, kh\u00f4ng th\u1eabm h\u01a1n m\u00e0u chu\u1ea9n. S\u1ecfi ch\u1ee9a l\u01b0\u1ee3ng t\u1ea1p ch\u1ea5t h\u1eefu c\u01a1 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi quy \u0111\u1ecbnh tr\u00ean v\u1eabn c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng n\u1ebfu k\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m ki\u1ec3m ch\u1ee9ng trong b\u00ea t\u00f4ng cho th\u1ea5y l\u01b0\u1ee3ng t\u1ea1p ch\u1ea5t h\u1eefu c\u01a1 n\u00e0y kh\u00f4ng l\u00e0m gi\u1ea3m c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 l\u00fd y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi b\u00ea t\u00f4ng c\u1ee5 th\u1ec3. 8.  H\u00e0m l\u01b0\u1ee3ng ion Cl– (tan trong axit) trong c\u1ed1t li\u1ec7u l\u1edbn, kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 0,01 %. C\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u1ed1t li\u1ec7u l\u1edbn c\u00f3 h\u00e0m l\u01b0\u1ee3ng ion Cl– l\u1edbn h\u01a1n 0,01 % n\u1ebfu t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng ion Cl— trong 1 m3 b\u00ea t\u00f4ng kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 0,6 kg. 9.  Kh\u1ea3 n\u0103ng ph\u1ea3n \u1ee9ng ki\u1ec1m – silic \u0111\u1ed1i v\u1edbi c\u1ed1t li\u1ec7u l\u1edbn \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh nh\u01b0 \u0111\u1ed1i v\u1edbi c\u1ed1t li\u1ec7u nh\u1ecf ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m tra theo ph\u01b0\u01a1ng ph\u00e1p ho\u00e1 h\u1ecdc (TCVN 7572-14 : 2006) ph\u1ea3i n\u1eb1m trong v\u00f9ng c\u1ed1t li\u1ec7u v\u00f4 h\u1ea1i. Khi kh\u1ea3 n\u0103ng ph\u1ea3n \u1ee9ng ki\u1ec1m – silic c\u1ee7a c\u1ed1t li\u1ec7u ki\u1ec3m tra n\u1eb1m trong v\u00f9ng c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y h\u1ea1i th\u00ec c\u1ea7n th\u00ed nghi\u1ec7m ki\u1ec3m tra b\u1ed5 xung theo ph\u01b0\u01a1ng ph\u00e1p thanh v\u1eefa (TCVN 7572-14 : 2006) \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1eafc ch\u1eafn v\u00f4 h\u1ea1i.. 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