{"id":15746,"date":"2025-04-17T13:58:50","date_gmt":"2025-04-17T11:58:50","guid":{"rendered":"https:\/\/lga-geo.de\/?p=15746"},"modified":"2025-04-17T13:59:41","modified_gmt":"2025-04-17T11:59:41","slug":"asbesthaltige-abstandshalter-in-stahlbetonbauten","status":"publish","type":"post","link":"https:\/\/lga-geo.de\/en\/unternehmen\/aktuelles\/asbesthaltige-abstandshalter-in-stahlbetonbauten\/","title":{"rendered":"Asbestos-containing spacers in reinforced concrete structures"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Between 1960 and 1993, asbestos-containing spacers and pipe sleeves\/wall thicknesses were used in reinforced concrete construction, with the main period of use being from 1970 to 1985. Spacers are necessary to ensure sufficient concrete cover when forming the components. It is estimated that they were installed at a density of approximately 4 pieces per square meter, with a spacing of 50-100 cm. Today, plastic or (asbestos-free) fiber cement products are used for this purpose.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-8f761849 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" width=\"2500\" height=\"1875\" src=\"https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter01.jpg\" alt=\"\" class=\"wp-image-15754\" style=\"width:auto;height:240px\" srcset=\"https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter01.jpg 2500w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter01-960x720.jpg 960w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter01-1920x1440.jpg 1920w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter01-768x576.jpg 768w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter01-1536x1152.jpg 1536w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter01-2048x1536.jpg 2048w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter01-16x12.jpg 16w\" sizes=\"(max-width: 2500px) 100vw, 2500px\" \/><figcaption class=\"wp-element-caption\">Abstandshalter &#8211; Knochenform<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" width=\"2500\" height=\"1875\" src=\"https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter03.jpg\" alt=\"\" class=\"wp-image-15751\" style=\"width:auto;height:240px\" srcset=\"https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter03.jpg 2500w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter03-960x720.jpg 960w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter03-1920x1440.jpg 1920w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter03-768x576.jpg 768w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter03-1536x1152.jpg 1536w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter03-2048x1536.jpg 2048w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter03-16x12.jpg 16w\" sizes=\"(max-width: 2500px) 100vw, 2500px\" \/><figcaption class=\"wp-element-caption\">Abstandshalter &#8211; Quader<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" width=\"2500\" height=\"1875\" src=\"https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter02.jpg\" alt=\"\" class=\"wp-image-15755\" style=\"width:auto;height:240px\" srcset=\"https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter02.jpg 2500w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter02-960x720.jpg 960w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter02-1920x1440.jpg 1920w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter02-768x576.jpg 768w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter02-1536x1152.jpg 1536w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter02-2048x1536.jpg 2048w, https:\/\/lga-geo.de\/wp-content\/uploads\/Ziegler_Abstandshalter02-16x12.jpg 16w\" sizes=\"(max-width: 2500px) 100vw, 2500px\" \/><figcaption class=\"wp-element-caption\">Abstandshalter &#8211; Zylinder<\/figcaption><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Asbestos-containing materials in older buildings today pose an obstacle to demolition and recycling. In addition to occupational safety risks, disposal problems arise if asbestos-containing components are not separated. To plan and carry out this process properly, a qualified survey is required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Survey by the LGA<\/h5>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1218\" height=\"672\" src=\"https:\/\/lga-geo.de\/wp-content\/uploads\/BAST2024_Brueckenquerschnitt.jpg\" alt=\"\" class=\"wp-image-15742\" srcset=\"https:\/\/lga-geo.de\/wp-content\/uploads\/BAST2024_Brueckenquerschnitt.jpg 1218w, https:\/\/lga-geo.de\/wp-content\/uploads\/BAST2024_Brueckenquerschnitt-960x530.jpg 960w, https:\/\/lga-geo.de\/wp-content\/uploads\/BAST2024_Brueckenquerschnitt-768x424.jpg 768w, https:\/\/lga-geo.de\/wp-content\/uploads\/BAST2024_Brueckenquerschnitt-18x10.jpg 18w\" sizes=\"(max-width: 1218px) 100vw, 1218px\" \/><figcaption class=\"wp-element-caption\">Querschnitt Hohlkastenbr\u00fccke (Quelle: BAST B200 2024)<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The basis for the survey of asbestos in buildings is the VDI Guideline 6202 Part 3. It specifies a representative sampling method adapted to the respective type of asbestos product (number of samples, sampling technique). Additionally, for asbestos-containing spacers, there is a publication by the Federal Highway Research Institute (BAST): \"Concept for Determining the Location and Number of Asbestos-Containing Spacers in Concrete Bridges,\" Bridges and Civil Engineering Issue B 200, July 2024.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A phased approach is recommended for all reinforced concrete structures. First, all available information, such as reinforcement plans, should be evaluated (\"Historical Research\"). The next step involves a visual inspection (\"Preliminary Inspection\"), similar to the close-up visual inspection according to DIN 1076. The goal here is to assign materials in simple cases or to obtain sample material with minimal effort.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In many cases, only a \"full inspection\" with the exposure of spacers and representative examination can provide clarity. For this purpose, the surface must be removed using low-emission methods (grinding with direct extraction) at several points over an area of approximately 1 square meter each, down to near the reinforcement level. This applies to each structural element separately, as different materials may have been used.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Pollutant removal<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">If the systematic survey reveals asbestos-containing spacers and\/or wall thicknesses, a significant portion can be removed before demolition by drilling\/chiseling if used consistently. If this is not feasible, post-demolition sorting can separate asbestos-containing and non-asbestos-containing fractions. Corresponding procedures are currently under development but are not yet available on a large scale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Conclusion<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Surveys for asbestos-containing spacers and pipe sleeves are absolutely necessary for reinforced concrete structures, especially from the period between 1970 and 1985, prior to demolition. The high effort is justified considering the achievable high recycling rate, which prevents extreme disposal costs if the entire material otherwise has to be deposited as asbestos-containing waste.<\/p>","protected":false},"excerpt":{"rendered":"<p>Zwischen 1960 und 1993 wurden im Stahlbetonbau asbesthaltige Abstandhalter und Rohrh\u00fclsen\/Mauerst\u00e4rken eingesetzt, wobei die Hauptverwendungszeit von 1970 bis 1985 lag. Abstandshalter sind erforderlich, um beim Schalen der Bauteile eine ausreichende Beton\u00fcberdeckung zu gew\u00e4hrleisten. Man geht von einer Verlegedichte von ca. 4 St\u00fcck\/m\u00b2 bei einem Abstand von 50-100 cm aus. Heute werden hierf\u00fcr Kunststoff- oder (asbestfreie) [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":15753,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-15746","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allgemein"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Asbesthaltige Abstandshalter in Stahlbetonbauten - LGA Institut f\u00fcr Umweltgeologie und Altlasten GmbH<\/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:\/\/lga-geo.de\/en\/unternehmen\/aktuelles\/asbesthaltige-abstandshalter-in-stahlbetonbauten\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Asbesthaltige Abstandshalter in Stahlbetonbauten - LGA Institut f\u00fcr Umweltgeologie und Altlasten GmbH\" \/>\n<meta property=\"og:description\" content=\"Zwischen 1960 und 1993 wurden im Stahlbetonbau asbesthaltige Abstandhalter und Rohrh\u00fclsen\/Mauerst\u00e4rken eingesetzt, wobei die Hauptverwendungszeit von 1970 bis 1985 lag. Abstandshalter sind erforderlich, um beim Schalen der Bauteile eine ausreichende Beton\u00fcberdeckung zu gew\u00e4hrleisten. Man geht von einer Verlegedichte von ca. 4 St\u00fcck\/m\u00b2 bei einem Abstand von 50-100 cm aus. 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In der Mitte befindet sich ein metallischer Abstandshalter, der sternf\u00f6rmig im Beton eingebettet ist und eine kleine runde \u00d6ffnung in der Mitte aufweist. Rechts im Bild liegt ein Ma\u00dfstab, der diagonal \u00fcber die Fl\u00e4che verl\u00e4uft und zur Gr\u00f6\u00dfenbestimmung dient. 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