{"id":7599,"date":"2015-03-30T12:17:41","date_gmt":"2015-03-30T16:17:41","guid":{"rendered":"http:\/\/www.constructionspecifier.com\/?p=7599"},"modified":"2017-01-10T10:28:52","modified_gmt":"2017-01-10T15:28:52","slug":"concrete-surfaces","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/concrete-surfaces\/","title":{"rendered":"Tips for specifying exterior concrete surfaces"},"content":{"rendered":"
\"IMG_7463\"
Brooming large-area placements is a much more difficult task than brooming sidewalks or driveways. Controlling the depth of broom marks is just one of the problems faced by finishers. <\/span>Photo courtesy CECO Concrete Construction<\/em><\/figcaption><\/figure>\n

by Ward R. Malisch, PE, PhD, Bruce A. Suprenant, PE, \u2028and Frank Salzano, PE, PhD<\/strong><\/p>\n

Based on the information presented in the article, \u201cSpecifying Broomed Exterior Concrete Surfaces\u201d<\/a> by Ward R. Malisch, PE, PhD, Bruce A. Suprenant, PE, and Frank Salzano, PE, PhD in the April issue of <\/em>The Construction Specifier, the following are recommendations for specifying exterior concrete surfaces.<\/em><\/p>\n

Appearance (broom finish)<\/strong>
\nThe broom finish should be specified to match the appearance in an existing slab or pavement of comparable size. For instance, one should not specify a sidewalk appearance for a parking structure. Also, a mockup or reference sample should be specified for appearance consistent with the placement size. The limitations of a mockup should be understood; when one is used, there should always be a repair portion so the contractor\u2019s means and methods using the specified repair materials and procedures can be evaluated when repair is necessary.<\/p>\n

Texture<\/strong>
\nA limited-range broom finish\u2014such as light, medium, or heavy\u2014should be avoided because it is hard to distinguish between textures to that degree. One should specify a broom finish as light-to-medium or medium-to-heavy. Further, texture depth should not be specified unless a procedure for measuring depth is included in the specifications.<\/p>\n

Flatness<\/strong>
\nFor parking lots and other site paving, a 13-mm (\u00bd-in.) gap under a 3-m (10-ft) straightedge can be specified. Use ACI 117-10, Standard Specifications for Tolerances for Concrete Materials and Construction<\/em>, methodology for measuring with a straightedge. For parking structures, one should specify an overall floor flatness (FF) of 17 and a minimum local floor levelness (FL) of 11. (ASTM E1155, Standard Test Method for Determining FF<\/sub> Floor Flatness and FL<\/sub> Floor Levelness Numbers<\/em>, can be used for its methodology for measuring F-numbers.)<\/p>\n

Drainage<\/strong>
\nWhenever possible, a top-surface one-way slope or a one-way top and bottom surface slope should be specified, with two-way slopes and warps avoided. A two percent slope for water drainage of suspended slabs should be specified. The structural engineer should check short-term and long-term deflections to determine their effect on drainage.<\/p>\n","protected":false},"excerpt":{"rendered":"

Based on the information presented in the article, \u201cSpecifying Broomed Exterior Concrete Surfaces\u201d<\/a> by Ward R. Malisch, PE, PhD, Bruce A. Suprenant, PE, and Frank Salzano, PE, PhD in the April issue of The Construction Specifier<\/em>, this article includes recommendations for specifying exterior concrete surfaces.<\/p>\n","protected":false},"author":2,"featured_media":8027,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[520,12,179,449,183,189,284,202,459,509,463],"tags":[1670,752,3253,3252,3254],"class_list":["post-7599","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-features","category-web-exclusive","category-masterformat","category-uniformat","category-03-00-00-concrete","category-09-00-00-finishes","category-09-60-00-flooring","category-32-00-00-exterior-improvements","category-b10superstructure","category-c2030flooring","category-c20interior-finishes","tag-broom","tag-concrete","tag-parking","tag-paving","tag-sidewalk","entry"],"acf":[],"yoast_head":"\nTips for specifying exterior concrete surfaces - The Construction Specifier<\/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:\/\/www.constructionspecifier.com\/concrete-surfaces\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tips for specifying exterior concrete surfaces - The Construction Specifier\" \/>\n<meta property=\"og:description\" content=\"Based on the information presented in the article, \u201cSpecifying Broomed Exterior Concrete Surfaces\u201d by Ward R. 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