{"id":318,"date":"2023-05-17T11:07:52","date_gmt":"2023-05-17T09:07:52","guid":{"rendered":"https:\/\/dirigadesantier.ro\/?p=318"},"modified":"2025-01-14T14:28:22","modified_gmt":"2025-01-14T12:28:22","slug":"beton-retarde-cu-zahar-sau-mai-green-cu-legume","status":"publish","type":"post","link":"https:\/\/dirigadesantier.ro\/?p=318","title":{"rendered":"Beton \u201eretarde\u201d cu zah\u0103r sau mai \u201egreen\u201d cu legume"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Ce este un retarder?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Retard\u0103rii sau aditivii de \u00eent\u00e2rziere a prizei betonului au rolul de a men\u021bine materialul lucrabil \u00een timpul procesului de turnare \u0219i de a am\u00e2na procesul de \u00eent\u0103rire ini\u021bial al amestecului. Majoritatea aditivilor func\u021bioneaz\u0103 \u0219i ca reductoare de ap\u0103 \u0219i pot antrena pu\u021bin aer in beton. Un retarder este un agent chimic cu rolul de \u201esistem de fr\u00e2nare\u201d \u00een reac\u021bia chimic\u0103 care are loc \u00een timpul procesului de \u00eent\u0103rire al betonului.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Retarderul reduce rezisten\u021ba betonului?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Retard\u0103rii nu au nici un efect negativ asupra propriet\u0103\u021bilor betonului, ei pot \u00eembun\u0103t\u0103\u021bii lucrabilitatea , accelerarea finisarii, pot cre\u0219te rezisten\u021ba, pot conserva cimentul \u0219i pot ajuta la reducerea contrac\u021biei \u0219i fisurilor termice. De asemenea el este folosit pentru a reduce fenomenul de accelerare a \u00eent\u0103ririi betonului datorat temperaturilor ridicate din&nbsp; mediu exterior.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zah\u0103rul poate fi o component\u0103 a unui retarder?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Amestecul de ap\u0103 cu zah\u0103r este deja folosit la scar\u0103 larg\u0103 pentru a manipula procesul de \u00eent\u0103rire al betonului. Zah\u0103rul, ca \u0219i component al unui retarder, \u00eencetine\u0219te procesul de priza al betonului \u0219i este folosit pentru turnarea betonul pe timp c\u0103lduros sau c\u00e2nd se pun \u00een oper\u0103 &nbsp;cantit\u0103\u021bi mari de material care necesit\u0103 un timp mai mare de finisare. Zah\u0103rul poate prelungii timpul de priz\u0103 al betonului cu p\u00e2n\u0103 la 1.33 ore la un nivel de dozare de 0.06% din greutatea cimentului. Betonul se \u00eent\u0103re\u0219te datorit\u0103 reac\u021biei de hidratare din care rezulta un gel silicat de calciu hidratat iar zah\u0103rul ac\u021bioneaz\u0103 ca un retarder asupra acestui proces de formare.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zah\u0103rul poate s\u0103 deterioreze betonul?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Folosit \u00een cantit\u0103\u021bi mari si necontrolate, zah\u0103rul poate s\u0103 \u201adistrug\u0103\u201d procesul de \u00eent\u0103rire al betonului de aceea este indicat a fi folosit \u00een situa\u021bii de urgen\u021b\u0103 (\u00eent\u0103rirea betonului in autobetoniere).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Putem arunca sfecl\u0103 de zah\u0103r \u00een amestecul de beton?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O echip\u0103 de cercet\u0103tori de la Universitatea Lancaster au folosit fibrele ob\u021binute din sfecla de zah\u0103r pentru a \u00eembun\u0103t\u0103\u021bii propriet\u0103\u021bile mecanice ale betonului. \u00cen cadrul studiului toate legumele folosite au fost rezultate din resturi menajere, acest fapt \u00eencuraj\u00e2nd si &nbsp;procesul de reciclare. De asemenea r\u0103d\u0103cinoasele pare c\u0103 sunt deja folosite \u00een industria vopselelor.<strong><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Dar morcovi?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pentru a reduce fenomenul de fisurare al betonului creste\u021bi adaosul de morcovi \u00een consisten\u021ba sa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cercet\u0103torii britanici au descoperit c\u0103 folosind \u00een prepararea betonului un mic amestec de morcovi cu ciment, rezisten\u021ba betonului poate fi m\u0103rit\u0103 cu pana la 80%. De asemenea au subliniat faptul c\u0103 pentru acest amestec au folosit o cantitate mai mica de ciment ceea ce poate reduce semnificativ cantitatea de dioxid de carbon global\u0103 rezultat\u0103 \u00een urma procesului de producere al cimentului. &nbsp;Prin ad\u0103ugarea unei \u00bd kg de nano-material ob\u021binut din morcovi se poate reduce aproximativ 10 kg de ciment la metru cub de beton.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pentru o via\u021b\u0103 s\u0103n\u0103toas\u0103 evita\u021bi consumul de zah\u0103r, pentru o planet\u0103 mai curat\u0103 recicla\u021bi resturile menajere, le pute\u021bi arunca pe toate \u00een beton!<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-318","post","type-post","status-publish","format-standard","hentry","category-articol-site"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - 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