Xi m\u0103ng l\u00e0 lo\u1ea1i v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng \u0111\u01b0\u1ee3c d\u00f9ng ph\u1ed5 bi\u1ebfn. Khi tr\u1ed9n xi m\u0103ng v\u1edbi n\u01b0\u1edbc, \u0111\u00e1, c\u00e1t ta s\u1ebd \u0111\u01b0\u1ee3c b\u00ea t\u00f4ng r\u1ea5t r\u1eafn ch\u1eafc.<\/p>\n\n\n\n
T\u1ea1i sao b\u00ea t\u00f4ng l\u1ea1i \u0111\u00f3ng r\u1eafn \u0111\u01b0\u1ee3c?<\/p>\n\n\n\n
Xi m\u0103ng th\u01b0\u1eddng l\u00e0 h\u1ed7n h\u1ee3p c\u1ee7a canxi silicat ho\u1eb7c cacbonat. Xi m\u0103ng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng c\u00e1ch d\u00f9ng \u0111\u00e1 v\u00f4i (canxi cacbonat); \u0111\u1ea5t s\u00e9t (h\u1ee3p ch\u1ea5t c\u1ee7a nh\u00f4m, silic v\u00e0 oxy) cho v\u00e0o l\u00f2 r\u1ed3i nung \u1edf nhi\u1ec7t \u0111\u1ed9 cao m\u00e0 th\u00e0nh. Khi \u0111em b\u1ed9t xi m\u0103ng tr\u1ed9n v\u1edbi n\u01b0\u1edbc. Kho\u1ea3ng sau 1 gi\u1edd, c\u00e1c h\u1ea1t xi m\u0103ng s\u1ebd b\u1ecb bao b\u1ecdc b\u1eb1ng l\u1edbp m\u1ecfng b\u00e1n th\u1ea9m th\u1ea5u. M\u00e0ng ch\u1ea5t m\u1ecfng n\u00e0y ch\u00ednh l\u00e0 do canxi silicat v\u00e0 n\u01b0\u1edbc t\u1ea1o n\u00ean. Ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00e2y l\u00e0 qu\u00e1 tr\u00ecnh k\u1ebft h\u1ee3p n\u01b0\u1edbc. Xi m\u0103ng th\u01b0\u1eddng sau khi ti\u1ebfp x\u00fac v\u1edbi n\u01b0\u1edbc kho\u1ea3ng 4 gi\u1edd m\u1edbi b\u1eaft \u0111\u1ea7u \u0111\u00f3ng r\u1eafn. B\u1ea5y gi\u1edd nh\u1edd hi\u1ec7n t\u01b0\u1ee3ng b\u00e1n th\u1ea9m th\u1ea5u, ph\u1ea7n n\u01b0\u1edbc b\u00ean ngo\u00e0i s\u1ebd ng\u1ea5m d\u1ea7n v\u00e0o b\u00ean trong l\u1edbp m\u00e0ng. C\u00e1c h\u1ea1t xi m\u0103ng s\u1ebd x\u1ea3y ra s\u1ef1 ho\u00e0 tan m\u1ed9t ph\u1ea7n tu\u1ef3 theo n\u1ed3ng \u0111\u1ed9. Do \u00e1p su\u1ea5t th\u1ea9m th\u1ea5u, th\u1ec3 t\u00edch t\u0103ng l\u00ean, m\u00e0ng m\u1ecfng v\u1ee1 ra v\u00e0 l\u1ea1i h\u00ecnh th\u00e0nh m\u00e0ng keo m\u1edbi, qu\u00e1 tr\u00ecnh l\u1eb7p \u0111i l\u1eb7p l\u1ea1i nhi\u1ec1u l\u1ea7n, b\u00ean ngo\u00e0i h\u1ea1t xi m\u0103ng s\u1ebd h\u00ecnh th\u00e0nh c\u00e1c t\u1ed5 ch\u1ee9c d\u1ea1ng s\u1ee3i r\u1ed7ng. Ph\u1ea7n l\u1edbn c\u00e1c s\u1ee3i r\u1ed7ng gi\u1ed1ng nh\u01b0 nh\u1eefng “c\u00e2y kim” r\u1ed7ng l\u00f2ng c\u1ee9 th\u1ebf ph\u00e1t tri\u1ec3n ra ph\u00eda ngo\u00e0i. C\u00e1c s\u1ee3i nh\u1ecf r\u1ed7ng l\u00f2ng gi\u1ed1ng nh\u01b0 nh\u1eefng “c\u00e2y kim” l\u1edbn l\u00ean, k\u1ebft h\u1ee3p l\u1ea1i v\u1edbi nhau, nh\u1edd \u0111\u00f3 c\u00e1c h\u1ea1t s\u1ebd k\u1ebft d\u00ednh v\u1edbi nhau t\u1ea1o th\u00e0nh c\u00e1c “m\u1ea1ng l\u01b0\u1edbi”. Ch\u00ednh t\u1ed5 ch\u1ee9c m\u1ea1ng l\u01b0\u1edbi t\u1ea1o th\u00e0nh m\u1ed9t h\u00ecnh kh\u1ed1i c\u00f3 c\u1ea5u tr\u00fac m\u1ea1ng l\u01b0\u1edbi, nh\u1edd \u0111\u00f3 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a xi m\u0103ng t\u0103ng l\u00ean.<\/p>\n\n\n\n
Xi m\u0103ng sau m\u1ed9t s\u1ed1 ng\u00e0y s\u1ebd d\u1ea7n d\u1ea7n r\u1eafn l\u1ea1i. N\u1ebfu \u0111\u1ee7 n\u01b0\u1edbc th\u00ec sau m\u1ed9t s\u1ed1 th\u00e1ng, s\u1ed1 n\u0103m c\u01b0\u1eddng \u0111\u1ed9 b\u00ea t\u00f4ng s\u1ebd ti\u1ebfp t\u1ee5c t\u0103ng l\u00ean. Ph\u1ea3n \u1ee9ng gi\u1eefa xi m\u0103ng v\u00e0 n\u01b0\u1edbc x\u1ea3y ra r\u1ea5t ch\u1eadm. \u0110\u1ec3 ch\u1ee9ng minh \u0111i\u1ec1u \u0111\u00f3, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 \u0111em xi m\u0103ng \u0111\u00e3 \u0111\u00f3ng r\u1eafn nghi\u1ec1n nh\u1ecf, r\u1ed3i tr\u1ed9n th\u00eam n\u01b0\u1edbc, ng\u01b0\u1eddi ta th\u1ea5y xi m\u0103ng l\u1ea1i \u0111\u00f3ng r\u1eafn l\u1ea7n th\u1ee9 hai. Khi xi m\u0103ng \u0111\u00f3ng r\u1eafn c\u00f3 c\u00e1c k\u1ebd n\u1ee9t nh\u1ecf c\u00f3 l\u00fac s\u1ebd t\u1ef1 li\u1ec1n l\u1ea1i. Nguy\u00ean nh\u00e2n c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng t\u1ef1 li\u1ec1n l\u1ea1i l\u00e0 do khi c\u00f3 khe n\u1ee9t, n\u01b0\u1edbc s\u1ebd l\u1ecdt v\u00e0o, th\u1ea9m th\u1ea5u v\u00e0o b\u00ean trong, tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a h\u1ea1t xi m\u0103ng l\u1ea1i xu\u1ea5t hi\u1ec7n c\u00e1c t\u1ed5 ch\u1ee9c s\u1ee3i m\u1edbi v\u00e0 l\u00e0m cho khe n\u1ee9t li\u1ec1n l\u1ea1i.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Xi m\u0103ng; S\u1ef1 \u0111\u00f3ng r\u1eafn.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Xi m\u0103ng l\u00e0 lo\u1ea1i v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng \u0111\u01b0\u1ee3c d\u00f9ng ph\u1ed5 bi\u1ebfn. Khi tr\u1ed9n xi m\u0103ng v\u1edbi n\u01b0\u1edbc, \u0111\u00e1, c\u00e1t ta s\u1ebd \u0111\u01b0\u1ee3c b\u00ea t\u00f4ng r\u1ea5t r\u1eafn ch\u1eafc. T\u1ea1i sao b\u00ea t\u00f4ng l\u1ea1i \u0111\u00f3ng r\u1eafn \u0111\u01b0\u1ee3c? Xi m\u0103ng th\u01b0\u1eddng l\u00e0 h\u1ed7n h\u1ee3p c\u1ee7a canxi silicat ho\u1eb7c cacbonat. Xi m\u0103ng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng c\u00e1ch d\u00f9ng […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[8,15],"tags":[],"class_list":["post-7912","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7912","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7912"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7912\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7912"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7912"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7912"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}