{"id":126077,"date":"2020-12-21T14:38:21","date_gmt":"2020-12-21T19:38:21","guid":{"rendered":"https:\/\/www.constructionspecifier.com\/?p=126077"},"modified":"2020-12-21T14:59:18","modified_gmt":"2020-12-21T19:59:18","slug":"researchers-develop-sensors-to-test-concrete-strength-in-real-time","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/researchers-develop-sensors-to-test-concrete-strength-in-real-time\/","title":{"rendered":"Researchers develop sensors to test concrete strength in real time"},"content":{"rendered":"<p><iframe loading=\"lazy\" title=\"Testing New  Concrete Sensors at Purdue&#039;s Gateway Project\" width=\"750\" height=\"422\" src=\"https:\/\/www.youtube.com\/embed\/QowhBdJuXK0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>How long it takes to construct a building depends, in large part, on when the concrete of each floor is strong enough to take on loads. Engineers at <a href=\"https:\/\/purdue.edu\/\" target=\"_blank\" rel=\"noopener noreferrer\">Purdue University<\/a>, a public research institution in West Lafayette, Indiana, have developed sensors that could safely speed up a construction timeline by determining concrete strength onsite in real time.<\/p>\n<p>Typically, concrete mix designs require testing before implementation in a construction project. Once those mixes have been vetted for use, the mix design cannot be altered without additional offsite testing. The technology designed by Purdue engineers would remove the need for extensive offsite testing by allowing construction contractors to verify the concrete\u2019s maturity onsite.<\/p>\n<p>\u201cOur sensors could help make better data-driven decisions to determine the construction schedule and improve the quality of concrete construction,\u201d said\u00a0Luna Lu, Purdue\u2019s American Concrete Pavement Association (ACPA) professor of\u00a0Civil Engineering.<\/p>\n<p>The Purdue team is working with\u00a0<a href=\"https:\/\/www.fawilhelm.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">F.A. Wilhelm Construction Co. Inc.<\/a>\u00a0to test and compare the technology with traditional commercial sensors installed into a floor of what will be Purdue\u2019s five-story\u00a0Engineering and Polytechnic Gateway Complex.<\/p>\n<figure id=\"attachment_126080\" aria-describedby=\"caption-attachment-126080\" style=\"width: 300px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2020\/12\/Opener-20.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-126080\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2020\/12\/Opener-20-300x200.jpg\" alt=\"Purdue University (West Lafayette, Indiana) engineers have developed sensors that can instantly measure concrete strength, thereby speeding up a construction timeline. Photo courtesy Purdue University photo\/Rebecca McElhoe\" width=\"300\" height=\"200\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2020\/12\/Opener-20-300x200.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2020\/12\/Opener-20-500x333.jpg 500w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2020\/12\/Opener-20.jpg 650w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-126080\" class=\"wp-caption-text\"><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Purdue University (West Lafayette, Indiana) engineers have developed sensors that can instantly measure concrete strength, thereby speeding up a construction timeline.<\/span><br \/><em><span style=\"font-size: 10pt; font-family: arial, helvetica, sans-serif;\">Photo courtesy Purdue University photo\/Rebecca McElhoe<\/span><\/em><\/figcaption><\/figure>\n<p>Lu and her research team also are testing the sensors in\u00a0<a href=\"https:\/\/www.purdue.edu\/newsroom\/releases\/2019\/Q3\/science-to-reveal-how-long-highway-construction-should-actually-take.html\" target=\"_blank\" rel=\"noopener noreferrer\">highways across Indiana<\/a>\u00a0as part of an effort to better determine when concrete is ready to take on heavy truck traffic.<\/p>\n<p>\u201cWe are trying to work with contractors to find out how much saving we can do for them in terms of time, cost, and the number of people needed at a site, which reduces risk and improves construction safety,\u201d Lu said. \u201cThat starts with industry collaborations to evaluate how well the sensors work.\u201d<\/p>\n<p>Over the last decade, general contractors have used traditional sensors to make reliable and accurate estimates of concrete strength and maturity. But before even pouring the concrete, the method requires a month-long process of testing the concrete mix design in the lab. A line graph is generated to note the strength of the mix design based on specific temperatures over time.<\/p>\n<p>This line graph is then used to match up temperature measurements from sensors in the field. Strength values on the graph, called a \u201cmaturity curve,\u201d help workers estimate when the concrete is strong enough to continue construction.<\/p>\n<p>If unexpected weather or anything else calls for changing the mix\u2019s main ingredients, a contractor has to generate a maturity curve all over again for the new mix.<\/p>\n<p>The sensors developed by Lu\u2019s lab would measure concrete strength directly from the floor deck in real time, eliminating the need for generating a maturity curve beforehand.<\/p>\n<p>\u201cThese new sensors are more of a \u2018plug and play.\u2019 We could make judgment calls on the fly,\u201d said Ryan Decker, Wilhelm\u2019s corporate quality assurance manager.<\/p>\n<p>Like commercial types, Lu\u2019s sensors would remain in the concrete. The sensors provide a more direct measurement of strength by using electricity to send an acoustic wave through the concrete. How concrete responds to particular wave speeds indicates its strength and stiffness.<\/p>\n<p>\u201cA wave propagating through concrete can tell us a lot of information. We can find out not only how strong the concrete is, but also detailed information about the concrete\u2019s microstructure,\u201d Lu said.<\/p>\n<p>Twelve of Lu\u2019s sensors have been installed into various sections of the Gateway Complex\u2019s third floor so that the teams can best understand how well they work compared with commercial sensors in use on the site.<\/p>\n<p>Lu\u2019s lab has validated the technology and is now developing a system that contractors could use to remotely receive the concrete\u2019s strength information.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Purdue University (West Lafayette, Indiana) engineers have developed sensors that can instantly measure concrete strength, thereby speeding up a construction timeline.<\/p>\n","protected":false},"author":13542,"featured_media":126079,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1029,6095],"tags":[6196,752,6195,1337,5939,6194],"class_list":["post-126077","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-videos","tag-acoustic-wave","tag-concrete","tag-concrete-maturity","tag-construction","tag-purdue-university","tag-sensor","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Researchers develop sensors to test concrete strength in real time - The Construction Specifier<\/title>\n<meta name=\"description\" content=\"Purdue University engineers have developed sensors that can instantly measure concrete strength, thereby speeding up a construction timeline.\" \/>\n<meta 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