{"id":7533,"date":"2020-05-22T15:05:39","date_gmt":"2020-05-22T09:35:39","guid":{"rendered":"https:\/\/www.onlinecivilforum.com\/site\/?p=7533"},"modified":"2022-12-13T11:28:20","modified_gmt":"2022-12-13T05:58:20","slug":"sprayed-concrete-admixtures-and-the-process","status":"publish","type":"post","link":"https:\/\/onlinecivilforum.com\/site\/sprayed-concrete-admixtures-and-the-process\/","title":{"rendered":"Sprayed Concrete Admixtures and the Process"},"content":{"rendered":"<p><strong>Sprayed Concrete Admixtures and the Process<\/strong><\/p>\n<p>Sprayed concrete or Shotcrete is pumped to the point of application projected in high velocity used for rabid construction.The applications are frequently vertical or overhead and this requires rapid stiffening if slumping or loss by concrete detaching from the substrate under its own weight is to be avoided. In tunneling applications, sprayed concrete is often used to provide early structural support and this requires early strength development as well as very rapid stiffening. While spraying the concrete maintained the distance between at least 1 to 2 meters from the nozzle.<\/p>\n<p>Admixtures can be used in fresh concrete to give stability and hydration control prior to spraying. Then by addition of an accelerating admixture at the spray nozzle, the rheology and setting of the concrete are controlled to ensure a satisfactory build-up on the substrate with a minimum of unbonded material causing rebound.<\/p>\n<p><strong>There are two spraying processes:<\/strong><\/p>\n<ul>\n<li>The dry process where the mix water and an accelerator are added to a dry mortar mix at the spray nozzle.<\/li>\n<li>The wet process where the mortar or concrete is pre-mixed with a stabilizer\/retarder prior to pumping to the nozzle where a liquid accelerator is added.<\/li>\n<\/ul>\n<p>The wet process has become the method of choice in recent times as it minimizes dust emissions and gives more controlled and consistent concrete.<\/p>\n<p><strong>Accelerators are of two types:<\/strong><\/p>\n<ul>\n<li>Alkaline, which gives the quickest set, often less than 1 minute, and very early strength development but presents a safety hazard to the applicators and tends to give low later age strengths.<\/li>\n<li>Alkali-free, which can take tens of minutes to set but is safer for the applicator and has little effect on later age strength.<\/li>\n<\/ul>\n<p>Sprayed concrete admixtures are often affected by the cement chemistry and their use requires technical and practical expertise. For these reasons, their use should be left to specialist applicators.<\/p>\n<p><strong>More Interesting Articles&nbsp;<\/strong><\/p>\n<p><strong><a href=\"https:\/\/onlinecivilforum.com\/site\/important-of-concrete-curing-and-methods\/\">Important of Concrete Curing and Methods<\/a><\/strong><\/p>\n<p><strong><a href=\"https:\/\/www.onlinecivil.net\/2020\/05\/important-tips-for-good-construction.html\">Important Tips for Good Construction Practices at Site<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sprayed Concrete Admixtures and the Process Sprayed concrete or Shotcrete is pumped to the point of application projected in high velocity used for rabid construction.The applications are frequently vertical or overhead and this requires rapid stiffening if slumping or loss by concrete detaching from the substrate under its own weight is to be avoided. In &hellip;<\/p>\n","protected":false},"author":2264,"featured_media":7535,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"two_page_speed":[],"footnotes":""},"categories":[22],"tags":[69,185],"class_list":["post-7533","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-concrete-technology","tag-concrete","tag-concrete-admixtures"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sprayed Concrete Admixtures and the Process - Online CivilForum<\/title>\n<meta name=\"description\" content=\"Sprayed Concrete Admixtures and the Process Sprayed concrete or Shotcrete is pumped to the point of application projected in high velocity\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/onlinecivilforum.com\/site\/sprayed-concrete-admixtures-and-the-process\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sprayed Concrete Admixtures and the Process\" \/>\n<meta property=\"og:description\" content=\"Sprayed Concrete Admixtures and the Process Sprayed concrete or Shotcrete is pumped to the point of application projected in high velocity\" \/>\n<meta property=\"og:url\" content=\"https:\/\/onlinecivilforum.com\/site\/sprayed-concrete-admixtures-and-the-process\/\" \/>\n<meta property=\"og:site_name\" content=\"Online CivilForum\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/civilwork\" \/>\n<meta property=\"article:published_time\" content=\"2020-05-22T09:35:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-12-13T05:58:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2020\/05\/Sprayed-Concrete-Admixtures-and-the-Process-jpg.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Sprayed Concrete Admixtures and the Process\" \/>\n<meta name=\"twitter:description\" content=\"Sprayed Concrete Admixtures and the Process Sprayed concrete or Shotcrete is pumped to the point of application projected in high velocity\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2020\/05\/Sprayed-Concrete-Admixtures-and-the-Process-jpg.webp\" \/>\n<meta name=\"twitter:creator\" content=\"@thomasjbritto\" \/>\n<meta name=\"twitter:site\" content=\"@thomasjbritto\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/sprayed-concrete-admixtures-and-the-process\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/sprayed-concrete-admixtures-and-the-process\\\/\"},\"author\":{\"name\":\"Admin\",\"@id\":\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/#\\\/schema\\\/person\\\/ccbccea3895033bfa0aa3bc0683d83ef\"},\"headline\":\"Sprayed Concrete Admixtures and the Process\",\"datePublished\":\"2020-05-22T09:35:39+00:00\",\"dateModified\":\"2022-12-13T05:58:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/sprayed-concrete-admixtures-and-the-process\\\/\"},\"wordCount\":335,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/sprayed-concrete-admixtures-and-the-process\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/wp-content\\\/uploads\\\/2020\\\/05\\\/Sprayed-Concrete-Admixtures-and-the-Process-jpg.webp\",\"keywords\":[\"Concrete\",\"Concrete Admixtures\"],\"articleSection\":[\"Concrete Technology\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/sprayed-concrete-admixtures-and-the-process\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/sprayed-concrete-admixtures-and-the-process\\\/\",\"url\":\"https:\\\/\\\/onlinecivilforum.com\\\/site\\\/sprayed-concrete-admixtures-and-the-process\\\/\",\"name\":\"Sprayed Concrete Admixtures and the Process - 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