{"id":159,"date":"2024-01-21T18:04:05","date_gmt":"2024-01-22T02:04:05","guid":{"rendered":"https:\/\/www.fwhb.ca\/?page_id=159"},"modified":"2026-03-20T19:59:29","modified_gmt":"2026-03-21T02:59:29","slug":"concrete-pressure","status":"publish","type":"page","link":"https:\/\/www.fwhb.ca\/?page_id=159","title":{"rendered":"Calculator &#8211; Concrete Pressure &#8211; CSA"},"content":{"rendered":"\n<p class=\"has-text-align-center has-text-color has-link-color has-medium-font-size wp-elements-51ae527aeab69671af183970a24ea15b wp-block-paragraph\" style=\"color:#ff0d00\"><a href=\"https:\/\/www.fwhb.ca\/?page_id=45\" data-type=\"page\" data-id=\"45\">Please read our disclaimer before using this calculator<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-left has-small-font-size\">This calculator is based on the Canadian standard<br>CSA-S269.1: Falsework and formwork<\/h4>\n\n\n\n<form name=\"cp_calculatedfieldsf_pform_1\" id=\"cp_calculatedfieldsf_pform_1\" action=\"?\" method=\"post\" enctype=\"multipart\/form-data\" class=\"cff-form \"  dir=\"ltr\">\n<input type=\"hidden\" name=\"cp_calculatedfieldsf_pform_psequence\" value=\"_1\" \/>\n<input type=\"hidden\" name=\"cp_calculatedfieldsf_id\" value=\"1\" \/><pre style=\"display:none !important;\"><script type=\"text\/javascript\">form_structure_1=[[{\"form_identifier\":\"\",\"name\":\"fieldname24\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":0,\"ftype\":\"fSectionBreak\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname26\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":1,\"ftype\":\"fCommentArea\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Step 1: What is the concrete pressure if concrete is fully liquid?\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname18\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":2,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\\\\(C_w\\\\) - Concrete density coefficient - \\\\(C_w\\\\) = 1 unless using light weigh concrete\",\"predefined\":\"1\",\"predefinedClick\":false,\"required\":false,\"exclude\":false,\"readonly\":true,\"numberpad\":false,\"spinner\":false,\"size\":\"medium\",\"prefix\":\"\",\"postfix\":\"\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"\",\"max\":\"\",\"step\":\"\",\"formatDynamically\":false,\"dformat\":\"number\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname14\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":3,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\\\\(\\\\rho_c\\\\) - Concrete density \\\\((\\\\frac{kN}{m^3})\\\\)\",\"predefined\":\"24\",\"predefinedClick\":false,\"required\":false,\"exclude\":false,\"readonly\":true,\"numberpad\":false,\"spinner\":false,\"size\":\"medium\",\"prefix\":\"\",\"postfix\":\"\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"\",\"max\":\"\",\"step\":\"\",\"formatDynamically\":false,\"dformat\":\"number\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname15\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":4,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\\\\(h\\\\) - Wall height \\\\((m)\\\\)\",\"predefined\":\"5\",\"predefinedClick\":false,\"required\":false,\"exclude\":false,\"readonly\":false,\"numberpad\":false,\"spinner\":false,\"size\":\"medium\",\"prefix\":\"\",\"postfix\":\"\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"0\",\"max\":\"100\",\"step\":\"0.25\",\"formatDynamically\":false,\"dformat\":\"number\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"dependencies\":[{\"rule\":\"\",\"complex\":false,\"fields\":[\"\"]}],\"form_identifier\":\"\",\"name\":\"fieldname17\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":5,\"ftype\":\"fCalculated\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Full liquid head pressure - \\\\(CP_{fl}=\\\\rho_c\\\\times C_w\\\\times h\\\\)\",\"predefined\":\"\",\"required\":false,\"exclude\":false,\"size\":\"medium\",\"eq\":\"ROUND(fieldname18*fieldname14*fieldname15*10)\\\/10\",\"min\":\"\",\"max\":\"\",\"suffix\":\" kPa\",\"prefix\":\"\",\"decimalsymbol\":\".\",\"groupingsymbol\":\"\",\"readonly\":true,\"currency\":false,\"noEvalIfManual\":true,\"formatDynamically\":false,\"dynamicEval\":true,\"hidefield\":false,\"validate\":false,\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname21\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":6,\"ftype\":\"fSectionBreak\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname27\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":7,\"ftype\":\"fCommentArea\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Step 2: If the concrete is place slowly, what is the anticipated wall pressure?\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname8\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":8,\"ftype\":\"fdropdown\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\\\\(C_c\\\\) - Concrete chemistry coefficient:\",\"size\":\"medium\",\"required\":false,\"exclude\":false,\"toSubmit\":\"value\",\"merge\":0,\"choiceSelected\":\"1.2 standard value for mixes with flyash or slag - 1.2 standard value for mixes with flyash or slag\",\"select2\":false,\"multiple\":false,\"first_choice\":false,\"first_choice_text\":\"\",\"vChoices\":1,\"showDep\":false,\"choices\":[\"1.2 standard value for mixes with flyash or slag\",\"1.0 for cement Type 10 (I), 20 (II), and 30 (III) without retarders\",\"1.2 for cement Type I, II, and III with retarders\",\"1.2 blends with less than 70% slag or 40% flyash without retarders\",\"1.2 blends with both slag and flyash, if (%F\\\/2 + %S) \\u003C 35% without retarders\",\"1.4 blends with both slag and flyash, if (%F\\\/2 + %S) \\u003C 35% with retarders\",\"1.4 blends with more than 70% slag or 40% flyash without retarders\",\"1.4 blends with less than 70% slag or 40% flyash with retarders\",\"1.5 blends with more than 70% slag or 40% flyash with retarders\"],\"optgroup\":[false,false,false,false,false,false,false,false,false],\"choicesVal\":[\"1.2\",\"1.0\",\"1.2\",\"1.2\",\"1.2\",\"1.4\",\"1.4\",\"1.4\",\"1.5\"],\"choicesDep\":[[],[],[],[],[],[],[],[],[]],\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname6\",\"fieldlayout\":\"top_aligned\",\"shortlabel\":\"\",\"index\":9,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"T - Concrete discharge temperature \\u003Cmo\\u003E(\\u003C\\\/mo\\u003E\\u003Cmo\\u003E\\u00b0\\u003C\\\/mo\\u003E\\u003Cmi\\u003EC\\u003C\\\/mi\\u003E\\u003Cmo\\u003E)\\u003C\\\/mo\\u003E\\u003C\\\/math\\u003E\",\"predefined\":\"10\",\"predefinedClick\":false,\"required\":false,\"exclude\":false,\"readonly\":false,\"numberpad\":false,\"spinner\":false,\"size\":\"medium\",\"prefix\":\"\",\"postfix\":\"\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"0\",\"max\":\"100\",\"step\":\"\",\"formatDynamically\":false,\"dformat\":\"number\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname16\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":10,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"R - Concrete placing rate \\\\((\\\\frac{m}{hr})\\\\)\",\"predefined\":\"0.5\",\"predefinedClick\":false,\"required\":false,\"exclude\":false,\"readonly\":false,\"numberpad\":false,\"spinner\":false,\"size\":\"medium\",\"prefix\":\"\",\"postfix\":\"\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"\",\"max\":\"\",\"step\":\"0.1\",\"formatDynamically\":false,\"dformat\":\"number\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"dependencies\":[{\"rule\":\"\",\"complex\":false,\"fields\":[\"\"]}],\"form_identifier\":\"\",\"name\":\"fieldname19\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":11,\"ftype\":\"fCalculated\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Wall pressure - \\\\(CP_w=C_cC_w(7.2+\\\\frac{1156}{T+17.8}+\\\\frac{244R}{T+17.8})\\\\)\",\"predefined\":\"\",\"required\":false,\"exclude\":false,\"size\":\"medium\",\"eq\":\"ROUND(fieldname8*fieldname18*(7.2+1156\\\/(fieldname6+17.8)+(244*fieldname16)\\\/(fieldname6+17.8))*10)\\\/10\",\"min\":\"\",\"max\":\"\",\"suffix\":\"\",\"prefix\":\"\",\"decimalsymbol\":\".\",\"groupingsymbol\":\"\",\"readonly\":true,\"currency\":false,\"noEvalIfManual\":true,\"formatDynamically\":false,\"dynamicEval\":true,\"hidefield\":false,\"validate\":false,\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname22\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":12,\"ftype\":\"fSectionBreak\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname28\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":13,\"ftype\":\"fCommentArea\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Step 3: What is the minimum allowable wall pressure?\",\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname12\",\"fieldlayout\":\"default\",\"shortlabel\":\"Minimum lateral pressure\",\"index\":14,\"ftype\":\"fradio\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Min lateral pressure\",\"layout\":\"one_column\",\"required\":false,\"exclude\":false,\"readonly\":false,\"toSubmit\":\"value\",\"choiceSelected\":\"28.8 kPa - Clause 5.5.3.3.1.3.2 - 28.8\",\"showDep\":false,\"untickAccepted\":true,\"onoff\":0,\"choices\":[\"28.8 kPa - Clause 5.5.3.3.1.3.2\",\"48 kPa - Formwork high above ground, within 3m from edge - Clause 5.5.3.3.1.3.3\"],\"choicesVal\":[\"28.8\",\"48\"],\"choicesDep\":[[],[]],\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname23\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":15,\"ftype\":\"fSectionBreak\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"\",\"fBuild\":{},\"parent\":\"\"},{\"dependencies\":[{\"rule\":\"\",\"complex\":false,\"fields\":[\"\"]}],\"form_identifier\":\"\",\"name\":\"fieldname20\",\"fieldlayout\":\"default\",\"shortlabel\":\"Design pressure\",\"index\":16,\"ftype\":\"fCalculated\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Design pressure - Metric\",\"predefined\":\"\",\"required\":false,\"exclude\":false,\"size\":\"medium\",\"eq\":\"MIN(MAX(fieldname19,fieldname12),fieldname17)\",\"min\":\"\",\"max\":\"\",\"suffix\":\" kPa\",\"prefix\":\"\",\"decimalsymbol\":\".\",\"groupingsymbol\":\"\",\"readonly\":true,\"currency\":false,\"noEvalIfManual\":true,\"formatDynamically\":false,\"dynamicEval\":true,\"hidefield\":false,\"validate\":false,\"fBuild\":{},\"parent\":\"\"},{\"dependencies\":[{\"rule\":\"\",\"complex\":false,\"fields\":[\"\"]}],\"form_identifier\":\"\",\"name\":\"fieldname25\",\"fieldlayout\":\"default\",\"shortlabel\":\"\",\"index\":17,\"ftype\":\"fCalculated\",\"userhelp\":\"\",\"audiotutorial\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Design pressure - Imperial\",\"predefined\":\"\",\"required\":false,\"exclude\":false,\"size\":\"medium\",\"eq\":\"ROUND(fieldname20*20.8854342331501)\",\"min\":\"\",\"max\":\"\",\"suffix\":\" psf\",\"prefix\":\"\",\"decimalsymbol\":\".\",\"groupingsymbol\":\"\",\"readonly\":true,\"currency\":false,\"noEvalIfManual\":true,\"formatDynamically\":false,\"dynamicEval\":true,\"hidefield\":false,\"validate\":false,\"fBuild\":{},\"parent\":\"\"}],{\"0\":{\"title\":\"For concrete with slump less than 175mm and vibrator immersion less than 1.2m\",\"description\":\"\",\"formlayout\":\"top_aligned\",\"formtemplate\":\"cp_cff_elegant\",\"titletag\":\"H5\",\"textalign\":\"left\",\"headertextcolor\":\"\",\"evalequations\":1,\"evalequations_delay\":0,\"evalequationsevent\":\"2\",\"direction\":\"ltr\",\"loading_animation\":0,\"autocomplete\":1,\"persistence\":0,\"animate_form\":0,\"animation_effect\":\"fade\",\"customstyles\":\"\",\"request_cost\":\"\"},\"formid\":\"cp_calculatedfieldsf_pform_1\"}];<\/script><\/pre>\n<div id=\"fbuilder\">\n\t\t<div id=\"fbuilder_1\">\n\t\t<div id=\"formheader_1\"><\/div>\n\t\t<div id=\"fieldlist_1\"><\/div>\n\t\t<div class=\"clearer\"><\/div>\n\t<\/div>\n<\/div>\n<div class=\"clearer\"><\/div>\n<\/form>\n\t\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"961\" height=\"802\" src=\"https:\/\/www.fwhb.ca\/wp-content\/uploads\/2024\/08\/concrete-pressure.jpg\" alt=\"\" class=\"wp-image-813\" style=\"object-fit:cover\" srcset=\"https:\/\/www.fwhb.ca\/wp-content\/uploads\/2024\/08\/concrete-pressure.jpg 961w, https:\/\/www.fwhb.ca\/wp-content\/uploads\/2024\/08\/concrete-pressure-300x250.jpg 300w, https:\/\/www.fwhb.ca\/wp-content\/uploads\/2024\/08\/concrete-pressure-768x641.jpg 768w\" sizes=\"auto, (max-width: 961px) 100vw, 961px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center has-small-font-size wp-block-paragraph\"><br>Image from ACI-347: Guide to Formwork for Concrete <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Please read our disclaimer before using this calculator This calculator is based on the Canadian standardCSA-S269.1: Falsework and formwork Image from ACI-347: Guide to Formwork for Concrete<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-page-builder-no-sidebar.php","meta":{"footnotes":""},"class_list":["post-159","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.fwhb.ca\/index.php?rest_route=\/wp\/v2\/pages\/159","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fwhb.ca\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.fwhb.ca\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.fwhb.ca\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fwhb.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=159"}],"version-history":[{"count":10,"href":"https:\/\/www.fwhb.ca\/index.php?rest_route=\/wp\/v2\/pages\/159\/revisions"}],"predecessor-version":[{"id":1114,"href":"https:\/\/www.fwhb.ca\/index.php?rest_route=\/wp\/v2\/pages\/159\/revisions\/1114"}],"wp:attachment":[{"href":"https:\/\/www.fwhb.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}