{"id":5030,"date":"2026-08-17T02:46:00","date_gmt":"2026-08-17T02:46:00","guid":{"rendered":"https:\/\/roadskymarking.com\/?p=5030"},"modified":"2026-08-17T02:47:01","modified_gmt":"2026-08-17T02:47:01","slug":"aashto-m247-glass-beads-for-road-marking","status":"publish","type":"post","link":"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html","title":{"rendered":"Esferas de vidro AASHTO M247 para marca\u00e7\u00e3o rodovi\u00e1ria"},"content":{"rendered":"<p>Se trabalha com <strong><a style=\"text-decoration: underline;\" href=\"https:\/\/roadskymarking.com\/pt\/road-marking-material\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/road-marking-material\" target=\"_blank\" rel=\"noreferrer noopener\">materiais de marca\u00e7\u00e3o rodovi\u00e1ria<\/a><\/strong>, provavelmente j\u00e1 se deparou com as esferas de vidro AASHTO M247. S\u00e3o pequenas esferas de vidro, mas desempenham um papel muito importante para tornar as marca\u00e7\u00f5es rodovi\u00e1rias mais vis\u00edveis, especialmente \u00e0 noite.<\/p>\n\n\n\n<p>Em termos simples, a norma AASHTO M247 \u00e9 uma especifica\u00e7\u00e3o relativa \u00e0s esferas de vidro que s\u00e3o espalhadas ou pulverizadas sobre as marca\u00e7\u00f5es rodovi\u00e1rias para criar uma marca\u00e7\u00e3o retrorrefletora. A vers\u00e3o atual \u00e9 a AASHTO M 247-13(2022), que constitui a edi\u00e7\u00e3o atual reaprovada da especifica\u00e7\u00e3o.<\/p>\n\n\n\n<p>Ent\u00e3o, o que s\u00e3o exatamente estas contas de vidro, como funcionam e o que deve ter em aten\u00e7\u00e3o ao compr\u00e1-las? Vamos analisar isto mais de perto.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/What-Are-AASHTO-M247-Glass-Beads.jpg\" alt=\"O que s\u00e3o as esferas de vidro AASHTO M247?\" class=\"wp-image-5032\" srcset=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/What-Are-AASHTO-M247-Glass-Beads.jpg 600w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/What-Are-AASHTO-M247-Glass-Beads-400x267.jpg 400w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/What-Are-AASHTO-M247-Glass-Beads-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar o \u00edndice\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#What_Are_AASHTO_M247_Glass_Beads\" >O que s\u00e3o as esferas de vidro AASHTO M247?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#How_Do_Glass_Beads_Make_Road_Markings_Reflective\" >Como \u00e9 que as esferas de vidro tornam as marca\u00e7\u00f5es rodovi\u00e1rias refletoras?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#AASHTO_M247_Glass_Bead_Types\" >Tipos de esferas de vidro segundo a norma AASHTO M247<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#Important_Quality_Requirements\" >Requisitos importantes de qualidade<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#1_Refractive_Index\" >1. \u00cdndice de refrac\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#2_Roundness\" >2. Redondeza<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#3_Clean_and_Transparent_Glass\" >3. Vidro limpo e transparente<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#4_Moisture_Resistance\" >4. Resist\u00eancia \u00e0 humidade<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#5_Bead_Gradation\" >5. Grada\u00e7\u00e3o das contas<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#Where_Are_AASHTO_M247_Glass_Beads_Used\" >Onde s\u00e3o utilizadas as esferas de vidro AASHTO M247?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#Drop-On_Glass_Beads_vs_Premix_Glass_Beads\" >Esferas de vidro a granel vs. esferas de vidro pr\u00e9-misturadas<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#Why_Bead_Embedment_Matters\" >Por que raz\u00e3o a incorpora\u00e7\u00e3o de esferas \u00e9 importante<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#How_to_Choose_the_Right_AASHTO_M247_Glass_Beads\" >Como escolher as esferas de vidro AASHTO M247 adequadas<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#What_type_of_road_marking_material_are_you_using\" >Que tipo de material de sinaliza\u00e7\u00e3o rodovi\u00e1ria est\u00e1 a utilizar?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#What_bead_type_does_the_project_specification_require\" >Que tipo de conta \u00e9 exigido nas especifica\u00e7\u00f5es do projeto?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#What_level_of_nighttime_visibility_is_required\" >Que n\u00edvel de visibilidade noturna \u00e9 necess\u00e1rio?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#Will_the_beads_be_used_in_a_humid_environment\" >As contas v\u00e3o ser utilizadas num ambiente h\u00famido?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#Can_the_supplier_provide_test_reports\" >O fornecedor pode apresentar relat\u00f3rios de ensaio?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/#Final_Thoughts\" >Considera\u00e7\u00f5es finais<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_AASHTO_M247_Glass_Beads\"><\/span>O que s\u00e3o as esferas de vidro AASHTO M247?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>As esferas de vidro AASHTO M247 s\u00e3o part\u00edculas de vidro transparentes e esf\u00e9ricas utilizadas com materiais de sinaliza\u00e7\u00e3o rodovi\u00e1ria, tais como <strong><a href=\"https:\/\/roadskymarking.com\/pt\/road-marking-paint\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/road-marking-paint\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"text-decoration: underline;\">pintura de tr\u00e1fego<\/a><\/strong>, <strong><a href=\"https:\/\/roadskymarking.com\/pt\/thermoplastic-road-marking-paint.html\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/thermoplastic-road-marking-paint.html\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"text-decoration: underline;\">termopl\u00e1stico<\/a><\/strong>, e outros sistemas de sinaliza\u00e7\u00e3o rodovi\u00e1ria.<\/p>\n\n\n\n<p>A sua principal fun\u00e7\u00e3o \u00e9 melhorar o <strong><a href=\"https:\/\/roadskymarking.com\/pt\/7-factors-that-affect-road-marking-line-reflectivity.html\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/7-factors-that-affect-road-marking-line-reflectivity.html\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"text-decoration: underline;\">retrorrefletividade das marca\u00e7\u00f5es rodovi\u00e1rias<\/a><\/strong>.<\/p>\n\n\n\n<p>Quando os far\u00f3is de um ve\u00edculo iluminam uma marca\u00e7\u00e3o rodovi\u00e1ria, as esferas de vidro captam e redirecionam parte dessa luz de volta para o condutor. Isto torna as linhas rodovi\u00e1rias brancas e amarelas muito mais f\u00e1ceis de ver em condi\u00e7\u00f5es de pouca luz.<\/p>\n\n\n\n<p>Isto \u00e9 especialmente importante em autoestradas, vias r\u00e1pidas, cruzamentos, passagens para pe\u00f5es e outras vias onde a visibilidade noturna \u00e9 fundamental.<\/p>\n\n\n\n<p>A FHWA descreve as esferas de vidro em conformidade com a norma AASHTO M247 como uma solu\u00e7\u00e3o padr\u00e3o do setor e econ\u00f3mica para proporcionar retrorrefletividade \u00e0s marca\u00e7\u00f5es rodovi\u00e1rias.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_Glass_Beads_Make_Road_Markings_Reflective\"><\/span>Como \u00e9 que as esferas de vidro tornam as marca\u00e7\u00f5es rodovi\u00e1rias refletoras?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Na verdade, o princ\u00edpio \u00e9 bastante simples.<\/p>\n\n\n\n<p>Uma conta de vidro funciona como uma min\u00fascula lente \u00f3tica.<\/p>\n\n\n\n<p>Quando a luz dos far\u00f3is de um ve\u00edculo incide sobre a banda refletora, a superf\u00edcie curva do vidro desvia a luz e ajuda a refleti-la de volta para a fonte de luz. Uma vez que a luz \u00e9 direcionada de volta para o condutor, a marca\u00e7\u00e3o rodovi\u00e1ria aparece brilhante \u00e0 noite.<\/p>\n\n\n\n<p>Sem esferas de vidro, uma linha de sinaliza\u00e7\u00e3o rodovi\u00e1ria pintada pode continuar a ser vis\u00edvel durante o dia, mas a sua visibilidade \u00e0 noite pode ser muito menor.<\/p>\n\n\n\n<p>\u00c9 por isso que as contas de vidro s\u00e3o frequentemente chamadas de <strong><a href=\"https:\/\/roadskymarking.com\/pt\/glass-beads.html\/\" data-type=\"link\" data-id=\"https:\/\/roadskymarking.com\/glass-beads.html\" target=\"_blank\" rel=\"noreferrer noopener\" style=\"text-decoration: underline;\">esferas de vidro retrorrefletoras ou esferas de vidro para marca\u00e7\u00e3o rodovi\u00e1ria<\/a><\/strong>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/AASHTO-M247-Glass-Bead-Types.jpg\" alt=\"Tipos de esferas de vidro segundo a norma AASHTO M247\" class=\"wp-image-5033\" srcset=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/AASHTO-M247-Glass-Bead-Types.jpg 600w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/AASHTO-M247-Glass-Bead-Types-400x267.jpg 400w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/AASHTO-M247-Glass-Bead-Types-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AASHTO_M247_Glass_Bead_Types\"><\/span>Tipos de esferas de vidro segundo a norma AASHTO M247<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Um aspeto que pode causar alguma confus\u00e3o na compra de esferas de vidro AASHTO M247 \u00e9 a variedade de tipos de esferas dispon\u00edveis.<\/p>\n\n\n\n<p>A especifica\u00e7\u00e3o identifica:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tipo 0<\/strong> \u2013 grada\u00e7\u00e3o uniforme<\/li>\n\n\n\n<li><strong>Tipo 1<\/strong> \u2013 grada\u00e7\u00e3o padr\u00e3o<\/li>\n\n\n\n<li><strong>Tipo 2<\/strong> \u2013 grada\u00e7\u00e3o modificada<\/li>\n\n\n\n<li><strong>Tipo 3<\/strong> \u2013 grada\u00e7\u00e3o modificada<\/li>\n\n\n\n<li><strong>Tipo 4<\/strong> \u2013 grada\u00e7\u00e3o modificada<\/li>\n\n\n\n<li><strong>Tipo 5<\/strong> \u2013 grada\u00e7\u00e3o modificada<\/li>\n<\/ul>\n\n\n\n<p>Os diferentes tipos est\u00e3o relacionados, principalmente, com a distribui\u00e7\u00e3o granulom\u00e9trica, ou granula\u00e7\u00e3o, das esferas.<\/p>\n\n\n\n<p>Por exemplo, as esferas mais pequenas s\u00e3o normalmente utilizadas em aplica\u00e7\u00f5es em que \u00e9 necess\u00e1ria uma grada\u00e7\u00e3o mais fina, enquanto as esferas maiores podem ser \u00fateis em aplica\u00e7\u00f5es em que se pretende uma maior exposi\u00e7\u00e3o das esferas e maior durabilidade.<\/p>\n\n\n\n<p>Por isso, n\u00e3o se limite a pedir a um fornecedor \u201cesferas de vidro AASHTO M247\u201d. \u00c9 melhor especificar o tipo e a granulometria necess\u00e1rios, com base no seu sistema de marca\u00e7\u00e3o rodovi\u00e1ria e nas especifica\u00e7\u00f5es do projeto.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Important_Quality_Requirements\"><\/span>Requisitos importantes de qualidade<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A norma AASHTO M247 n\u00e3o se refere apenas ao tamanho dos gr\u00e2nulos. V\u00e1rias propriedades s\u00e3o importantes para garantir um desempenho consistente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Refractive_Index\"><\/span>1. \u00cdndice de refrac\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Uma das propriedades mais importantes \u00e9 o \u00edndice de refrac\u00e7\u00e3o.<\/p>\n\n\n\n<p>A norma AASHTO M247 especifica um \u00edndice de refrac\u00e7\u00e3o de aproximadamente 1,50 a 1,55 para as esferas de vidro.<\/p>\n\n\n\n<p>O \u00edndice de refrac\u00e7\u00e3o influencia a efici\u00eancia com que a luz entra e se propaga atrav\u00e9s da conta.<\/p>\n\n\n\n<p>Na pr\u00e1tica, \u00e9 essencial dispor de boas propriedades \u00f3ticas para se obter uma forte retrorrefletividade noturna.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Roundness\"><\/span>2. Redondeza<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A forma da conta tamb\u00e9m \u00e9 importante.<\/p>\n\n\n\n<p>Idealmente, as esferas de vidro devem ser t\u00e3o esf\u00e9ricas quanto poss\u00edvel. Os requisitos da norma AASHTO M247 incluem um n\u00edvel m\u00ednimo de esferas verdadeiramente esf\u00e9ricas, e as especifica\u00e7\u00f5es comerciais indicam normalmente um m\u00ednimo de 70% de esferas verdadeiramente esf\u00e9ricas.<\/p>\n\n\n\n<p>Por que \u00e9 que isto \u00e9 importante?<\/p>\n\n\n\n<p>Porque uma esferinha redonda funciona mais como uma pequena lente. As part\u00edculas irregulares ou partidas podem n\u00e3o proporcionar o mesmo desempenho \u00f3tico.<\/p>\n\n\n\n<p>Uma melhor redondeza tamb\u00e9m pode ajudar as esferas a fluir de forma mais consistente atrav\u00e9s do equipamento de aplica\u00e7\u00e3o.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Clean_and_Transparent_Glass\"><\/span>3. Vidro limpo e transparente<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>As contas devem estar limpas, secas e transparentes.<\/p>\n\n\n\n<p>A presen\u00e7a excessiva de bolhas, riscos, defeitos superficiais, contamina\u00e7\u00e3o ou outras imperfei\u00e7\u00f5es pode reduzir o desempenho \u00f3tico.<\/p>\n\n\n\n<p>Uma boa esferinha de vidro para sinaliza\u00e7\u00e3o rodovi\u00e1ria deve ter um aspeto transparente, em vez de turvo ou muito sujo.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Moisture_Resistance\"><\/span>4. Resist\u00eancia \u00e0 humidade<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A humidade pode causar problemas durante o armazenamento e a aplica\u00e7\u00e3o.<\/p>\n\n\n\n<p>Se os gr\u00e2nulos absorverem humidade ou formarem grumos, podem n\u00e3o fluir corretamente atrav\u00e9s do distribuidor de gr\u00e2nulos. Isto pode resultar numa distribui\u00e7\u00e3o irregular na marca\u00e7\u00e3o rodovi\u00e1ria.<\/p>\n\n\n\n<p>A norma AASHTO M247 inclui requisitos relativos aos revestimentos e \u00e0 resist\u00eancia \u00e0 humidade, consoante as exig\u00eancias do comprador.<\/p>\n\n\n\n<p>Para projetos em climas h\u00famidos ou chuvosos, o tratamento resistente \u00e0 humidade pode, por isso, ser um aspeto importante a ter em conta.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Bead_Gradation\"><\/span>5. Grada\u00e7\u00e3o das contas<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A grada\u00e7\u00e3o indica a forma como os tamanhos das esferas est\u00e3o distribu\u00eddos.<\/p>\n\n\n\n<p>Por exemplo, a especifica\u00e7\u00e3o utiliza tamanhos de peneira para controlar a percentagem de material que passa pelas diferentes aberturas das peneiras. Os diferentes tipos de M247 t\u00eam requisitos de granulometria distintos.<\/p>\n\n\n\n<p>Isto \u00e9 importante porque o tamanho do gr\u00e3o deve corresponder ao m\u00e9todo de aplica\u00e7\u00e3o e ao material de marca\u00e7\u00e3o.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Where-Are-AASHTO-M247-Glass-Beads-Used.jpg\" alt=\"Onde s\u00e3o utilizadas as esferas de vidro AASHTO M247\" class=\"wp-image-5034\" srcset=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Where-Are-AASHTO-M247-Glass-Beads-Used.jpg 600w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Where-Are-AASHTO-M247-Glass-Beads-Used-400x267.jpg 400w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Where-Are-AASHTO-M247-Glass-Beads-Used-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_Are_AASHTO_M247_Glass_Beads_Used\"><\/span>Onde s\u00e3o utilizadas as esferas de vidro AASHTO M247?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>As esferas de vidro AASHTO M247 s\u00e3o amplamente utilizadas em diversas aplica\u00e7\u00f5es de sinaliza\u00e7\u00e3o rodovi\u00e1ria.<\/p>\n\n\n\n<p>Entre as aplica\u00e7\u00f5es mais comuns contam-se:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Marca\u00e7\u00e3o das faixas de rodagem nas auto-estradas<\/li>\n\n\n\n<li>Linhas de contorno<\/li>\n\n\n\n<li>Linhas centrais<\/li>\n\n\n\n<li>S\u00edmbolos e setas rodovi\u00e1rias<\/li>\n\n\n\n<li>Passagens para pe\u00f5es<\/li>\n\n\n\n<li>Linhas de paragem<\/li>\n\n\n\n<li>Sinaliza\u00e7\u00e3o de controlo de tr\u00e1fego<\/li>\n\n\n\n<li>Marca\u00e7\u00f5es no pavimento do aeroporto, quando especificadas<\/li>\n\n\n\n<li>Sinaliza\u00e7\u00e3o horizontal urbana<\/li>\n\n\n\n<li>Sinaliza\u00e7\u00e3o em vias r\u00e1pidas e autoestradas<\/li>\n<\/ul>\n\n\n\n<p>Podem ser utilizados com diferentes tipos de materiais de marca\u00e7\u00e3o, dependendo dos requisitos do projeto.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Drop-On_Glass_Beads_vs_Premix_Glass_Beads\"><\/span>Esferas de vidro a granel vs. esferas de vidro pr\u00e9-misturadas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Tamb\u00e9m ir\u00e1 ficar a saber mais sobre as esferas de vidro \u00abdrop-on\u00bb e as esferas de vidro pr\u00e9-misturadas.<\/p>\n\n\n\n<p>Os gr\u00e2nulos de aplica\u00e7\u00e3o por gota s\u00e3o aplicados na superf\u00edcie do material de marca\u00e7\u00e3o rodovi\u00e1ria rec\u00e9m-instalado. Os gr\u00e2nulos ficam parcialmente incorporados na marca\u00e7\u00e3o, mantendo-se, no entanto, suficientemente expostos para proporcionar retrorrefletividade.<\/p>\n\n\n\n<p>Por outro lado, as esferas de pr\u00e9-mistura s\u00e3o incorporadas no material de marca\u00e7\u00e3o antes da aplica\u00e7\u00e3o.<\/p>\n\n\n\n<p>Muitos sistemas de marca\u00e7\u00e3o rodovi\u00e1ria utilizam uma combina\u00e7\u00e3o de tamanhos de gr\u00e2nulos e m\u00e9todos de aplica\u00e7\u00e3o para alcan\u00e7ar o desempenho pretendido.<\/p>\n\n\n\n<p>A abordagem correta depende do tipo de material de marca\u00e7\u00e3o, do equipamento de aplica\u00e7\u00e3o, das condi\u00e7\u00f5es de tr\u00e1fego e das especifica\u00e7\u00f5es do projeto.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Why-Bead-Embedment-Matters.jpg\" alt=\"Por que raz\u00e3o a incorpora\u00e7\u00e3o de esferas \u00e9 importante\" class=\"wp-image-5035\" srcset=\"https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Why-Bead-Embedment-Matters.jpg 600w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Why-Bead-Embedment-Matters-400x267.jpg 400w, https:\/\/roadskymarking.com\/wp-content\/uploads\/2026\/08\/Why-Bead-Embedment-Matters-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Bead_Embedment_Matters\"><\/span>Por que raz\u00e3o a incorpora\u00e7\u00e3o de esferas \u00e9 importante<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A aquisi\u00e7\u00e3o de esferas de vidro AASHTO M247 de alta qualidade \u00e9 apenas uma parte do trabalho.<\/p>\n\n\n\n<p>A forma como as contas s\u00e3o aplicadas \u00e9 igualmente importante.<\/p>\n\n\n\n<p>Se as esferas estiverem enterradas a uma profundidade excessiva no material de marca\u00e7\u00e3o, poder\u00e1 n\u00e3o haver superf\u00edcie de vidro exposta suficiente para proporcionar uma retrorreflex\u00e3o eficaz.<\/p>\n\n\n\n<p>Se ficarem demasiado salientes em rela\u00e7\u00e3o \u00e0 superf\u00edcie, podem ficar mais vulner\u00e1veis ao desgaste causado pelo tr\u00e1fego e \u00e0 perda.<\/p>\n\n\n\n<p>O objetivo \u00e9 alcan\u00e7ar o n\u00edvel adequado de incorpora\u00e7\u00e3o e exposi\u00e7\u00e3o das esferas.<\/p>\n\n\n\n<p>Esta \u00e9 uma das raz\u00f5es pelas quais as empresas especializadas em marca\u00e7\u00e3o rodovi\u00e1ria prestam especial aten\u00e7\u00e3o \u00e0 temperatura de aplica\u00e7\u00e3o, \u00e0 espessura do material, \u00e0 taxa de aplica\u00e7\u00e3o e ao equipamento utilizado.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Choose_the_Right_AASHTO_M247_Glass_Beads\"><\/span>Como escolher as esferas de vidro AASHTO M247 adequadas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Se estiver \u00e0 procura de contas de vidro para um projeto de sinaliza\u00e7\u00e3o rodovi\u00e1ria, sugiro que comece por fazer as seguintes perguntas:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_type_of_road_marking_material_are_you_using\"><\/span>Que tipo de material de sinaliza\u00e7\u00e3o rodovi\u00e1ria est\u00e1 a utilizar?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A tinta para sinaliza\u00e7\u00e3o rodovi\u00e1ria, o termopl\u00e1stico e outros sistemas de marca\u00e7\u00e3o podem exigir diferentes tamanhos de gr\u00e2nulos e m\u00e9todos de aplica\u00e7\u00e3o.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_bead_type_does_the_project_specification_require\"><\/span>Que tipo de conta \u00e9 exigido nas especifica\u00e7\u00f5es do projeto?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>N\u00e3o presuma que o Tipo 1 \u00e9 sempre a escolha certa. Verifique primeiro a documenta\u00e7\u00e3o do projeto.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_level_of_nighttime_visibility_is_required\"><\/span>Que n\u00edvel de visibilidade noturna \u00e9 necess\u00e1rio?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>As marca\u00e7\u00f5es rodovi\u00e1rias de maior desempenho podem exigir um sistema de granulados cuidadosamente concebido, em vez da simples utiliza\u00e7\u00e3o de uma maior quantidade de granulados.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Will_the_beads_be_used_in_a_humid_environment\"><\/span>As contas v\u00e3o ser utilizadas num ambiente h\u00famido?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Se for o caso, talvez valha a pena considerar um tratamento resistente \u00e0 humidade.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_the_supplier_provide_test_reports\"><\/span>O fornecedor pode apresentar relat\u00f3rios de ensaio?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Isto \u00e9 particularmente importante para projetos de infraestruturas governamentais, rodovi\u00e1rias e internacionais.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Final_Thoughts\"><\/span>Considera\u00e7\u00f5es finais<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A norma AASHTO M 247 continua a ser uma das principais especifica\u00e7\u00f5es a ter em conta na aquisi\u00e7\u00e3o de esferas de vidro para marca\u00e7\u00f5es rodovi\u00e1rias. A vers\u00e3o atualmente publicada \u00e9 a AASHTO M 247-13(2022), que abrange as esferas de vidro utilizadas na produ\u00e7\u00e3o de marca\u00e7\u00f5es rodovi\u00e1rias refletoras.<\/p>\n\n\n\n<p>Se pretender adquirir esferas de vidro AASHTO M247 para sinaliza\u00e7\u00e3o rodovi\u00e1ria, deve ter em conta tr\u00eas aspetos: conformidade com as especifica\u00e7\u00f5es, qualidade das esferas e desempenho na aplica\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>If you work with road marking materials, you have probably come across AASHTO M247 glass beads. They are small glass beads, but they play a very important role in making road markings easier to see, especially at night. In simple terms, AASHTO M247 is a specification for glass beads that are dropped or sprayed onto pavement markings to create a retroreflective road marking. The current version is AASHTO M 247-13(2022), which is the reapproved current edition of the specification. So, what exactly are these glass beads, how do they work, and what should you check when buying them? Let&#8217;s take a closer look. What Are AASHTO M247 Glass Beads? AASHTO M247 glass beads are transparent, spherical glass particles used with pavement marking materials such as traffic paint, thermoplastic, and other road marking systems. Their main job is to improve the retroreflectivity of road markings. When a vehicle&#8217;s headlights shine on a road marking, the glass beads capture and redirect part &#8230;<\/p>","protected":false},"author":1,"featured_media":5032,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-5030","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AASHTO M247 Glass Beads for Road Marking - Roadsky<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AASHTO M247 Glass Beads for Road Marking - Roadsky\" \/>\n<meta property=\"og:description\" content=\"If you work with road marking materials, you have probably come across AASHTO M247 glass beads. They are small glass beads, but they play a very important role in making road markings easier to see, especially at night. In simple terms, AASHTO M247 is a specification for glass beads that are dropped or sprayed onto pavement markings to create a retroreflective road marking. The current version is AASHTO M 247-13(2022), which is the reapproved current edition of the specification. So, what exactly are these glass beads, how do they work, and what should you check when buying them? Let&#8217;s take a closer look. What Are AASHTO M247 Glass Beads? AASHTO M247 glass beads are transparent, spherical glass particles used with pavement marking materials such as traffic paint, thermoplastic, and other road marking systems. Their main job is to improve the retroreflectivity of road markings. When a vehicle&#8217;s headlights shine on a road marking, the glass beads capture and redirect part ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/roadskymarking.com\/pt\/aashto-m247-glass-beads-for-road-marking.html\/\" \/>\n<meta property=\"og:site_name\" content=\"Nanjing Roadsky Traffic Facility Co.,Ltd. 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They are small glass beads, but they play a very important role in making road markings easier to see, especially at night. In simple terms, AASHTO M247 is a specification for glass beads that are dropped or sprayed onto pavement markings to create a retroreflective road marking. The current version is AASHTO M 247-13(2022), which is the reapproved current edition of the specification. So, what exactly are these glass beads, how do they work, and what should you check when buying them? Let&#8217;s take a closer look. What Are AASHTO M247 Glass Beads? AASHTO M247 glass beads are transparent, spherical glass particles used with pavement marking materials such as traffic paint, thermoplastic, and other road marking systems. Their main job is to improve the retroreflectivity of road markings. 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