Posts Tagged: coffee
Scientists strengthen concrete by 30 percent with used coffee grounds
Humans produce around 4.4 billion tons of concrete every year. That process consumes around 8 billion tons of sand (out of the 40-50 billion tons in total used annually) which has, in part, led to acute shortages of the building commodity in recent years. At the same time, we generate about 10 billion kilograms of used coffee grounds over the same span — coffee grounds which a team of researchers from RMIT University in Australia have discovered can be used as a silica substitute in the concrete production process that, in the proper proportions, yields a significantly stronger chemical bond than sand alone.
“The disposal of organic waste poses an environmental challenge as it emits large amounts of greenhouse gases including methane and carbon dioxide, which contribute to climate change,” lead author of the study, Dr Rajeev Roychand of RMIT’s School of Engineering, said in a recent release. He notes that Australia alone produces 75 million kilograms of used coffee grounds each year, most of which ends up in landfills.
Coffee grounds can’t simply be mixed in raw with standard concrete as they won’t bind with the other materials due to their organic content, Dr. Roychand explained. In order to make the grounds more compatible, the team experimented with pyrolyzing the materials at 350 and 500 degrees C, then substituting them in for sand in 5, 10, 15 and 20 percentages (by volume) for standard concrete mixtures.
The team found that at 350 degrees is perfect temperature, producing a “29.3 percent enhancement in the compressive strength of the composite concrete blended with coffee biochar,” per the team’s study, published in the September issue of Journal of Cleaner Production. “In addition to reducing emissions and making a stronger concrete, we’re reducing the impact of continuous mining of natural resources like sand,” Dr. Roychand said.
“The concrete industry has the potential to contribute significantly to increasing the recycling of organic waste such as used coffee,” added study co-author Dr Shannon Kilmartin-Lynch, a Vice-Chancellor’s Indigenous Postdoctoral Research Fellow at RMIT. “Our research is in the early stages, but these exciting findings offer an innovative way to greatly reduce the amount of organic waste that goes to landfill,” where it’s decomposition would generate large amounts of methane, a greenhouse gas 21 times more potent than carbon dioxide.
This article originally appeared on Engadget at https://www.engadget.com/scientists-strengthen-concrete-by-30-percent-with-used-coffee-grounds-221643441.html?src=rss
Engadget is a web magazine with obsessive daily coverage of everything new in gadgets and consumer electronics
Fellow Opus review: A coffee grinder that doubles as a showpiece
When it comes to making coffee at home, there are people who do it and there are people who are obsessed with it. For many of us, we can’t just grab a bag of pre-ground swill from the grocery store and slap it in an auto-drip machine each morning. We need an arsenal of gear capable of extracting the nuanced flavors out of your locally roasted beans. And, if you’re like me, you like having the option of at least seven brewing methods because you really never know what you’ll be in the mood for. For true coffee lovers, a versatile grinder is a crucial piece of the at-home setup.
Fellow has a proven track record for well-designed, sturdy coffee gear. The company makes everything from travel mugs to kettles, including a grinder primarily designed to prepare beans for pour-over. That first model, the Ode, houses flat burrs capable of 31 grind settings that can cover AeroPress, French press, cold brew and other brewing methods too. However, it’s not capable of producing the fine grounds you need for espresso, and it was a pricey $ 299 at launch (the company now sells it for $ 255).
Enter the Opus. Fellow’s second grinder is more versatile than the Ode and can be used to prep beans for 9-bar espresso in addition to pour-over, French press, cold brew and much more. It also has ten more grind settings than the previous model and employs conical burrs to achieve consistent results. Like the Ode, the Opus has a magnetically-aligned catch cup outfitted with a spouted ring that helps keep your counter clean, doing so with the assistance of Fellow’s anti-static technology. Also like its predecessor, the Opus doesn’t have a massive hopper to store beans on top: it’s meant to be a single-dose machine where you can grind up to 110 grams at a time. This saves space since the Opus is considerably shorter than a lot of the competition. Plus, that design choice gives the device a much more refined appearance than the typical coffee grinder.
I have been using the Baratza Encore since I compiled the first coffee buyer’s guide for Engadget in 2019. If you take a poll among professional baristas, I’d wager the majority of them would tell you that’s the gold standard for at-home coffee grinders. And it’s for good reason: the Encore is very versatile and has been producing consistent quality for years. It does have the big hopper up top, whether you want to store your beans there or not. It’s loud, and because it pushes ground coffee into the catch from the side, there’s a lot of mess that ends up on your counter.
The Opus quickly solved two of the issues I have with the Encore. First, it’s remarkably quiet. I can actually run the Opus at night or early in the morning while my two-year-old is still asleep in a room near the kitchen free from worry I’ll wake him. That’s not always the case with the Encore. Second, the Opus drops grounds straight down into the catch cup, leaving less room for debris to escape. Fellow’s new grinder doesn’t have a knocker to reduce grind retention like the Ode, but it doesn’t need one. When I put in 70 grams of whole beans, I get 70 grams of ground coffee every time. It’s been so consistent I no longer feel the need to reweigh grounds to make sure I have enough – an added step I undertook with the Encore. And when you’re grinding for espresso, Fellow has included an insert for the catch cup to make transferring small loads to a portafilter a much less messy affair.
Fellow has also made the Opus very easy to use. A rotating ring near the top spins to adjust to your desired coarseness. If you’re like me and forget which setting to use for French press or pour-over, Fellow has printed a guide inside the lid of the bean chamber. No more reaching for a notebook or your phone to Google, the details you need will be right there when you go to load whole beans.
Ease of use extends to the controls. There’s only a single button you press to operate the Opus: one press for 30 seconds, two for a minute and three for 90 seconds. You can also long press the button for the grinder to run a full two minutes. Unlike the Ode, the Opus doesn’t turn off when it senses all the beans are ground. Instead, it runs until the selected time runs out or you mosey back to and press the button one final time. The lack of auto-shutoff doesn’t bother me though, since the Encore runs until you turn it off with no set time options.
The Opus improves three things for my daily coffee routine. It runs quietly and it keeps my kitchen cleaner while producing consistently ground beans no matter which setting I put it on. It also looks a lot better than the two coffee grinders I’ve used for any length of time, mostly due to the fact that the lack of a large hopper makes it as much of a showpiece as a piece of brewing equipment. At $ 195, it’s significantly cheaper than the Ode but slightly more than the Encore. Those few extra dollars I’d gladly part with for clean counters, a toddler that sleeps a few more minutes and a dash of modern flair.
Fellow’s Opus is a coffee grinder you’ll want to show off
Fellow is well-known among coffee geeks for its well-designed range of brewing accessories. The company makes everything from kettles and mugs to brewers and grinders. And while Fellow’s first grinder, the Ode, is mostly designed for pour overs, the company will debut a more versatile model next month. The Opus is a conical burr grinder than can sort everything from fine espresso to coarse cold brew.
Inside, a six-blade 40mm burr set offers consistent grinds across 41 different settings. So whether you’re brewing AeroPress or French press, the Opus will cover a lot more styles than the flat burr Ode. Fellow did bring its anti-static tech back for the new model, which the company says will help keep the mess to a minimum. Plus, there’s an automatic timed stop, single dose loading, 110-gram capacity hopper and no-tool calibration. The Opus will be available on February 21st for $ 195, significantly cheaper than the second-gen Ode.
Weekend Workshop: How to build a coffee table that’s also a universal TV remote
Universal remotes are great but what if you could control your living room media hub via your coffee table? Do just that by the end of the weekend with this innovative Instructables walkthrough.
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Ford’s genius co-bots can build cars, make coffee, and even give massages
At a production facility in Cologne, Germany, Ford is using machines called co-bots to help fit shock absorbers onto Fiestas. The co-bots work alongside humans and can even be programmed to make coffee.
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