{"id":13774,"date":"2022-11-16T14:25:39","date_gmt":"2022-11-16T20:25:39","guid":{"rendered":"https:\/\/www.arch.tamu.edu\/?p=13774"},"modified":"2023-04-13T09:26:49","modified_gmt":"2023-04-13T14:26:49","slug":"demolition-woman","status":"publish","type":"post","link":"https:\/\/www.arch.tamu.edu\/news\/2022\/11\/16\/demolition-woman\/","title":{"rendered":"Demolition Woman"},"content":{"rendered":"\n
Buildings that face demolition could soon be transformed into a new type of concrete that would be used to create new structures, an approach that reduces landfill waste and creates jobs. <\/p>\n\n\n\n
It\u2019s the revolutionary vision of Julie Hartell, an assistant professor of construction science, who is poised to give old building materials a new lease on life with her work in the Center for Infrastructure Renewal Lab at Texas A&M. <\/p>\n\n\n\n
Inspired by her experience as a structural engineer working on urban structures with durability issues in her hometown of Montreal, Hartell pursued a master\u2019s degree in infrastructure rehabilitation and then a Ph.D. focusing on concrete material durability and sustainability.<\/p>\n\n\n\n
Her research and newfound passion led her to teach at American universities, where she realized that a massive solution was necessary to reduce waste in the industry. <\/p>\n\n\n\n
\u201cAs much as I love concrete, it is a wasteful material, because we don\u2019t have adequate recycling technologies yet,\u201d she said. <\/p>\n\n\n\n
\u201cConstruction and demolition waste is the number one waste producer in the United States,\u201d said Hartell. \u201cOur industry, I hate to say it, is a massive polluter and it\u2019s a big problem. Every municipality with a landfill is adversely affected by the accumulation of construction and demolition waste.\u201d<\/p>\n\n\n\n
The creation of concrete materials is also terrible for the environment, as it\u2019s one of the largest contributors in terms of carbon emissions and carbon footprint. <\/p>\n\n\n\n
\u201cWe’re looking at over 150 million tons of material that’s being disposed in landfills per year,\u201d she said. \u201cThis represents a viable source for aggregates that we could incorporate into new concrete mixtures.\u201d<\/p>\n\n\n\n
Destruction from natural hazards such as hurricanes and tornados adds more building debris to landfills. <\/p>\n\n\n\n
While teaching at Oklahoma State University, Hartell saw the devastation caused by hurricanes in Texas and nearby coastal regions. \u201cI could not believe that the only solution we had was to landfill everything and do it all again from scratch,\u201d she said. <\/p>\n\n\n\n
Current processes for reusing materials from existing structures aren\u2019t viable for most construction projects due to extensive time, effort and costs associated with salvaging usable pieces. <\/p>\n\n\n\n
To reuse elements of a structure, workers either salvage usable pieces like doors, windows and material before demolition, or sort through the debris afterwards to recover elements like steel and concrete for recycling. But getting materials to the point where they can be re-utilized can be more effort than it\u2019s worth. <\/p>\n\n\n\n
\u201cSteel is a high-dollar value recycling material, so you want to remove as much steel as possible, but you also have to separate it from the concrete,\u201d Hartell said. \u201cIt takes time, effort, different types of equipment, and there is cost associated with that and in sorting the debris.\u201d<\/p>\n\n\n\n
This cost ends up making products from recycling materials about 40 percent higher than just using new products, said Hartell. If buying new is the cheaper option, there\u2019s no incentive for consumers or the industry to deal with the waste. <\/p>\n\n\n\n
Hartell thinks she has a solution to reuse without the extensive sorting or legwork \u2014 just pulverize the whole thing. <\/p>\n\n\n\n
\u201cWe\u2019d smash it,\u201d Hartell said with a grin. <\/p>\n\n\n\n
\u201cEverything. The building, the doors, the carpets, the lighting, the ceramic, the toilet \u2014 we\u2019d take it all, crush it and nothing goes to landfill. We\u2019d smash and smash and smash until we have a very, very, very small particle the same size as sand.\u201d<\/p>\n\n\n\n
Like a granular circle of life, everything has a purpose and goes on to become renewed. The sand-size particles, in Hartell\u2019s scenario, would have water, cement and chemicals added to them to create a new concrete material. <\/p>\n\n\n\n
Some of the crushing technology already exists, but it hasn\u2019t been used in this way due to the varying components in existing concrete mixes. Also, advances in chemistry would be needed to create an effective, stable concrete or other material with the aggregate. <\/p>\n\n\n\n
To pin down the processing, Hartell and her research team are using a $25,000 grant from the Texas A&M Construction Industry Advisory Council to explore large-scale equipment that could process different parts of a structure down to a desirable shape and size. <\/p>\n\n\n\n
\u201cWe may come up with brand new equipment or use something already on the market,\u201d she said. \u201cIt\u2019s really fun to explore the scholarly side of how to go about this and make the desired end product low cost.\u201d <\/p>\n\n\n\n