Landscape Architect & Specifier News

JUL 2018

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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18 Landscape Architect and Specifier News Finding Better Materials for 3D Printing Looking to resolve the problems posed by using concrete- based materials in 3D printing, specifically that it can clog machines, the U.S. Army Corps of Engineers has developed and patented a material made from a form of silica, and sand, clay and fly ash, along with a liquid admixture that improves its ability to flow, and a binding agent that does the same as well as lessens the set-time. This new material is reported to potentially speed up construction of items such as walls and bridges. Greener Concrete with More Benefits With CarbonCure's new system for mixing concrete, the wet material is injected with a factory's captured CO2 waste product, which reacts with the mix and converts to a different mineral. This cannot only reduce the earth's carbon footprint, it is reported to improve the compressive strength of concrete, allowing manufacturers to use less cement in the mix: another way for carbon reduction and a means of evening out the cost for the CO2 capture. The concrete is currently being use in a development in Atlanta scheduled to be completed in 2019. Concrete Strength from Vegetables Following the lead of adding graphene - the basic structural element of graphite, diamonds and charcoal - to concrete to make it more durable, researchers in England discovered that adding 'nano platelets' developed from the fibers of root vegetables such as carrots and beets, produced better results at less expense. The study showed that when these materials were combined with a traditional concrete mix of Portland cement, aggregate and water, they increased the amount in that mix of calcium silicate hydrate, a key to concrete's strength. And nano platelet–infused concrete was more dense than its traditional counterpart, thereby weathering deterioration better. ACI to Participate in Virtual Event on Science The Engineering and Science Career Network links association job boards, bringing the best candidates and recruiters together in an expanded employment network. The American Concrete Institute will take part in the Engineering & Science Career Network Virtual Career Fair event, September 20, 2018. The free virtual event will help early career as well as experienced concrete industry professionals advance their job-seeking skills and gain access to leading employers from throughout the U.S. and abroad. Job seekers will have the opportunity to connect, network and interview in a virtual environment designed for confidentiality, efficiency and professionalism - bringing the best candidates and recruiters together in an expanded employment network. Employers will have the advantage of ready access to registered candidates' information. Additionally, ACI has developed a sponsorship program that will provide additional employer visibility to job seekers. ACI's first virtual career fair on February 27, 2018 attracted nearly 400 participants. The ability to network with potential employers and receive resume consultations without having to travel to a physical location was cited as one of the prime reasons for being part of the event. Another Method for Autonomous Repair of Masonry As reported earlier, U.S. researchers are developing a self-healing concrete by mixing dormant spores of a fungus into it. Now, U.K. engineers have started to explore using bacteria paired with trigger chemicals that will produce minerals such as calcium carbonate to automatically repair damage to materials like brickwork, building stone, marble and granite. The overall goal is to create a product that can be applied as a liquid. h a r d s c a p e n e w s

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