{"id":27766,"date":"1997-05-01T04:00:00","date_gmt":"1997-05-01T04:00:00","guid":{"rendered":"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/article\/cause-for-slow-setting_o"},"modified":"1997-05-01T04:00:00","modified_gmt":"1997-05-01T04:00:00","slug":"cause-for-slow-setting_o","status":"publish","type":"post","link":"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/how-to\/cause-for-slow-setting_o\/","title":{"rendered":"Cause for Slow Setting"},"content":{"rendered":"<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\"> <p class=\"wp-block-paragraph\"><strong>Q.:<\/strong> I&#8217;m a pattern-stamping contractor in Louisiana and last winter I had a problem with slow setting and excessive bleeding of a concrete slab. The weather was unusually cold here, with air temperatures around 45\u00b0 F. The cementitious material was 20% fly ash, and the concrete also contained a water reducer. The concrete didn&#8217;t set for six hours, and there was so much bleedwater that dry color-shake application and stamping were delayed. What caused this to happen?<\/p> <p class=\"wp-block-paragraph\"><strong>A.:<\/strong> The three factors that you mentioned low temperatures, replacing cement with fly ash, and use of a water reducer may all have contributed to slow setting of the concrete.<\/p> <p class=\"wp-block-paragraph\">When concrete sets slowly, the bleeding period is prolonged. That&#8217;s why you had more bleedwater than usual. To avoid this problem during cool weather, you can order concrete that doesn&#8217;t contain a water reducer, or have the producer add an additional 100 pounds of cement per cubic yard of concrete. Don&#8217;t use calcium chloride accelerators because they can cause discoloration of decorative concrete flatwork.<\/p><\/div> ","protected":false},"excerpt":{"rendered":"<p>Q.: I&#8217;m a pattern-stamping contractor in Louisiana and last winter I had a problem with slow setting and excessive bleeding of a concrete slab. The weather was unusually cold here, with air temperatures around 45\u00b0 F. The cementitious material was 20% fly ash, and the concrete also contained a water reducer. The concrete didn&#8217;t set [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"scheduledNewsletterDates":[],"_scheduled_newsletter_id":0,"footnotes":"","jetpack_post_was_ever_published":false,"zonda_content_type_url_append":"_o","zonda_dfp_zone":"","zonda_exclude_recommended_contents":false,"zonda_exclude_most_popular":true,"zonda_exclude_tagged_results":false,"zonda_eyebrow":"Problem Clinic","zonda_last_newsletter_date":"2099-12-31T23:59:59.999-05:00","zonda_original_url":"","zonda_pdf_version":0,"zonda_print_headline":"Cause for Slow Setting","zonda_promo_abstract":"I'm a pattern-stamping contractor in Louisiana and last winter I had a problem with slow setting and excessive bleeding of a concrete slab. The weather was unusually cold here, with air temperatures around 45 F. The cementitious material was 20% fly ash,","zonda_promo_headline":"","zonda_promo_image":0,"zonda_subheadline":""},"tags":[],"news_item_type":[1160],"section_10":[72605],"subject":[1961,16533,7296,671,52013,102],"organization":[],"award":[],"person":[],"product_type_10":[],"content-group":[],"event":[],"location":[],"state":[],"brand":[],"jlc-category":[],"year_tax":[],"sponsor":[],"coauthors":[17696],"class_list":["post-27766","post","type-post","status-publish","format-standard","hentry","news_item_type-instruction","section_10-how-to","subject-bleeding","subject-cementitious-materials-and-pozzolans","subject-concrete-materials-and-admixtures","subject-concrete-setting","subject-fly-ash-concrete","subject-mergers-and-acquisitions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Cause for Slow Setting<\/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:\/\/zonda-develop.go-vip.net\/concrete-construction\/how-to\/cause-for-slow-setting_o\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cause for Slow Setting\" \/>\n<meta property=\"og:description\" content=\"Q.: I&#8217;m a pattern-stamping contractor in Louisiana and last winter I had a problem with slow setting and excessive bleeding of a concrete slab. 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