{"id":153768,"date":"2023-07-31T15:40:46","date_gmt":"2023-07-31T10:10:46","guid":{"rendered":"https:\/\/www.gkseries.com\/blog\/?p=153768"},"modified":"2023-07-31T15:40:48","modified_gmt":"2023-07-31T10:10:48","slug":"the-characteristic-compressive-strength-of-concrete-required-in-a-project-is-25-mpa-and-the-standard-deviation-in-the-observed-compressive-strength-expected-at-site-is-4-mpa","status":"publish","type":"post","link":"https:\/\/www.gkseries.com\/blog\/the-characteristic-compressive-strength-of-concrete-required-in-a-project-is-25-mpa-and-the-standard-deviation-in-the-observed-compressive-strength-expected-at-site-is-4-mpa\/","title":{"rendered":"The characteristic compressive strength of concrete required in a project is 25 MPa and the standard deviation in the observed compressive strength expected at site is 4 MPa"},"content":{"rendered":"\n<p>Q. The characteristic compressive strength of concrete required in a project is 25 <em>MPa <\/em>and the standard deviation in the observed compressive strength expected at site is 4 <em>MPa<\/em>. The average compressive strength of cubes tested at different water-cement (<em>w\/c<\/em>) ratios using the same material as is used for the project is given in the table.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><em>w\/c <\/em>(%)<\/td><td>45<\/td><td>50<\/td><td>55<\/td><td>60<\/td><\/tr><tr><td>Average compressive strength of cubes (<em>MPa<\/em>)<\/td><td>35<\/td><td>25<\/td><td>20<\/td><td>15<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">The water-cement ratio (in <em>percent, round off to the <strong>lower integer<\/strong><\/em>) to be used in the mix is<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Solution:<\/p>\n\n\n\n<p>fck=25;\u03c3=4MPa<br>fm=fck+1.65\u03c3=31.6\u00a0MPa<br>Using interpolation<br>w\/c req=50\u2212(50\u221245)\/(35\u221225)\u00d7(31.6\u221225)<br>= 46.7 (Rounded off to the lowest integer).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Q. The characteristic compressive strength of concrete required in a project is 25 MPa and the standard deviation in the observed compressive strength expected at site is 4 MPa. The average compressive strength of cubes tested at different water-cement (w\/c) ratios using the same material as is used for the project is given in the [&hellip;]<\/p>\n","protected":false},"author":419,"featured_media":153769,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[5141],"tags":[5140],"class_list":["post-153768","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gate","tag-gate-questions"],"_links":{"self":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/153768","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/users\/419"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/comments?post=153768"}],"version-history":[{"count":1,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/153768\/revisions"}],"predecessor-version":[{"id":153770,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/153768\/revisions\/153770"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/media\/153769"}],"wp:attachment":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/media?parent=153768"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/categories?post=153768"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/tags?post=153768"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}