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Cyclic triaxial tests: Evaluation of liquefaction resistance in chemically treated soils

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Cyclic triaxial tests: Evaluation of liquefaction resistance in chemically treated soils


Researchers explore the potential of stress-controlled and strain-controlled cyclic triaxial testing for liquefaction resistance evaluation of chemically treated soils. Credit: Professor Shinya Inazumi , Shibaura Institute of Technology, Japan. www.sciencedirect.com/science/article/pii/S259012302502938X?via%3Dihub

Soil liquefaction can be a major threat to the infrastructure and built environments in an earthquake-prone area. This happens due to substantial loss of soil stiffness and strength due to applied stress. Loose, moderately granulated, sandy soil is more prone to soil liquefaction.

Recognizing the urgent need to enhance urban resilience in seismic-prone regions, particularly in rapidly urbanizing areas vulnerable to such hazards, scientists are focusing on different mitigation techniques. Soil compaction technique is one of the effective methods developed to enhance the liquefaction resistance of the soil.

However, developing a proper evaluation method is also of the utmost importance. Traditionally, stress-controlled cyclic triaxial tests are done for the evaluation. However, the results are often inconsistent and this can lead to an overestimation of the resistance capacity.

Also, focusing on sustainable options is an inevitability in present times. So, the scientists are also trying to focus on formulating and testing environment-friendly grouting substances.

To bridge the methodological gaps and promote safer, eco-friendly ground improvement for the global infrastructure, Professor Shinya Inazumi from College of Engineering, Shibaura Institute of Technology (SIT), Japan, along with a small team of researchers, developed a strain-controlled testing method using cyclic triaxial.

“We pursued this research after recognizing the urgent need to improve urban resilience to earthquakes,” mentions Prof. Inazumi, talking about the motivation for the study. The findings were published in the journal Results in Engineering.

As a grouting solution, an environment-friendly formulation of colloidal silica (CS) and geothermal-recycled sodium silicate were used. Compared to conventional grouting solutions, this reduces carbon-dioxide emissions during production by approximately 60%. Three different concentrations of CS–6%, 8%, and 10% were tested.

The stress-controlled test was conducted following previously established protocol. For the strain-controlled cyclic triaxial test, double-amplitude axial strain was maintained constant at 5%, simulating large cyclic deformations from earthquakes. Cumulative dissipated energy was evaluated as an alternative indicator of liquefaction potential.

The phase transformation angle was evaluated. Cumulative dissipated energy as a unified evaluation index was also evaluated. Pore pressure-based criterion, strain-based criterion, and energy-based criterion were assessed to evaluate the resistance.

The test result revealed that a higher concentration of CS increases the resistance, with 10% concentration yielding the best result. Analysis of the cumulative dissipated energy confirmed that energy-based evaluation is a viable approach for assessing liquefaction resistance.

“This new method is superior to the present evaluation methods,” mentions Prof. Inazumi. “It reduces the need for multiple specimens, which makes it cost-effective and produces consistent, reproducible results.”

The team also observed a linear relationship between dissipated energy and liquefaction resistance ratio (RL20, 5%) which can be a potential calibration path for integrating strain-controlled results into existing stress-based design charts. This can save time and improve previous test results significantly.

The new method’s potential of being integrated into energy-based designs supports its use in performance-based seismic design frameworks, as proposed in recent studies.

“The research has profound real-world applications, especially in earthquake-prone regions,” says Prof. Inazumi.

“One key application is retrofitting existing structures, based on the updated test results. Chemical grouting with CS can be used to mitigate liquefaction hazards in waterfront projects, such as expanding school buildings, residential complexes, and medical facilities near seawalls.”

Furthermore, this method can stabilize loose sands against lateral spreading. The eco-friendly nature of the silica formulation can also ensure the safety of marine environments. Additionally, owing to the low-vibration nature of this method, it could be ideal for crowded urban areas, aiding in the development of bridges, ports, and dams in regions such as Japan and California.

Taken together, integrating this new method of testing into global standards could save lives, minimize economic losses by providing precise, cost-effective liquefaction mitigating strategies.

In the future, the testing method could be used to evaluate other types of soil, other grout types, and testing methods. The study hugely contributes to the development of performance-oriented ground improvement design under seismic loading conditions.

More information:
Khin Nyein Chan Kyaw et al, Evaluation of liquefaction resistance in chemically grouted sand using cyclic triaxial tests, Results in Engineering (2025). DOI: 10.1016/j.rineng.2025.106875

Citation:
Cyclic triaxial tests: Evaluation of liquefaction resistance in chemically treated soils (2025, September 12)
retrieved 12 September 2025
from https://techxplore.com/news/2025-09-cyclic-triaxial-liquefaction-resistance-chemically.html

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AMD CEO Lisa Su Isn’t Afraid of the Competition

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AMD CEO Lisa Su Isn’t Afraid of the Competition


Michael Calore: Recording works.

Lauren Goode: Recording. Yeah.

Michael Calore: Yeah. It’s like when people say, let me film that. You’re not actually filming anything. You’re shooting a digital video.

Lauren Goode: So then if you have a video podcast, are you shooting the podcast? What do you say? Do you say taping, then?

Michael Calore: I think you say recording because it just—

Lauren Goode: Recording the pod.

Michael Calore: Yeah.

Lauren Goode: We’re recording the pod.

Michael Calore: It covers all the bases.

Lauren Goode: We’re capturing it.

Michael Calore: That’s what we’re doing.

Lauren Goode: We’re sublimating it. All right. Well, should we record this pod?

Michael Calore: I would like to, yes.

Lauren Goode: Let’s do it.

Michael Calore: Honestly, I’m still recovering from last week’s Big Interview event. My throat is still feeling a little bit raw, even though it’s been like four or five days.

Lauren Goode: You sound delightful to me.

Michael Calore: Thank you.

Lauren Goode: But that really was an epic event.

Michael Calore: It was.

Lauren Goode: Yeah.

Michael Calore: You were on stage.

Lauren Goode: I was. I was first up in the morning. Katie, our boss, gave the intro to the conference and then it was me and Lisa Su, the CEO of AMD. And not only was it a really interesting conversation, but then I was done for the day. I didn’t have to do any more interviews after that. And I just got to listen and absorb, and there were some other really great talks.

Michael Calore: There were, yes. And we’re going to talk through some of them. We’re also going to listen to your conversation with Lisa Su, and then we’ll talk about it, and we’ll take listeners behind the scenes of The Big Interview.



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Why SpaceX Is Finally Gearing Up to Go Public

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Why SpaceX Is Finally Gearing Up to Go Public


SpaceX is planning to raise tens of billions of dollars through an initial public offering next year, multiple outlets have reported, and Ars can confirm. This represents a major change in thinking from the world’s leading space company and its founder, Elon Musk.

The Wall Street Journal and The Information first reported about a possible IPO last Friday, and Bloomberg followed that up on Tuesday evening with a report suggesting the company would target a $1.5 trillion valuation. This would allow SpaceX to raise in excess of $30 billion.

This is an enormous amount of funding. The largest IPO in history occurred in 2019, when the state-owned Saudi Arabian oil company began public trading as Aramco and raised $29 billion. In terms of revenue, Aramco is a top-five company in the world.

Now SpaceX is poised to potentially match or exceed this value. That SpaceX would be attractive to public investors is not a surprise—it’s the world’s dominant space company in launch, space-based communications, and much more. For investors seeking unlimited growth, space is the final frontier.

But why would Musk take SpaceX public now, at a time when the company’s revenues are surging thanks to the growth of the Starlink Internet constellation? The decision is surprising because Musk has, for so long, resisted going public with SpaceX. He has not enjoyed the public scrutiny of Tesla, and feared that shareholder desires for financial return were not consistent with his ultimate goal of settling Mars.

Data Centers

Ars spoke with multiple people familiar with Musk and his thinking to understand why he would want to take SpaceX public.

A significant shift in recent years has been the rise of artificial intelligence, which Musk has been involved in since 2015, when he cofounded OpenAI. He later had a falling out with his cofounders and started his own company, xAI, in 2023. At Tesla, he has been pushing smart-driving technology forward and more recently focused on robotics. Musk sees a convergence of these technologies in the near future, which he believes will profoundly change civilization.

Raising large amounts of money in the next 18 months would allow Musk to have significant capital to deploy at SpaceX as he influences and partakes in this convergence of technology.

How can SpaceX play in this space? In the near term, the company plans to develop a modified version of the Starlink satellite to serve as a foundation for building data centers in space. Musk said as much on the social media network he owns, X, in late October: “SpaceX will be doing this.”



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We Found the Permanent Outdoor Lights Worth Putting on Your Home

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We Found the Permanent Outdoor Lights Worth Putting on Your Home


Weatherproofing. Every model needs a weatherproof rating to survive outside, so if you don’t see one, don’t buy it. There’s usually a lower rating for the control box compared to the rest of the lights, so be sure you can put that somewhere that’s a little less exposed to the elements. (As mentioned above, make sure you have an outdoor outlet, and check if there’s only one on a certain side of your home in case it limits your installation options.)

A range of installation options. You’ll want a set that comes with plenty of options for your own installation, including adhesive and drilled mounting options. What you need will vary based on your home design and materials; e.g., you’ll want adhesive for homes you can’t drill into. WIRED reviewer Kat Merck, who tested a couple different permanent lights, especially liked sets that had holders you screw onto your home that the puck-style permanent lights can slide onto.

Controls for individual lights. This should be a no-brainer, but some cheaper lights won’t give you this ability or have more roadblocks for customized control. Make sure you’ll have easy individual controls, or you might find yourself frustrated with the design results of these lights. It’s similar to design controls that you’d see on smart bulbs and smart string lights.

A great app. This goes hand in hand with the need for individual light control—a good app determines whether that and other features are accessible. Govee and Eufy, two of our favorite permanent outdoor lights we’ve tried, both have good apps that are easy to use and come with preloaded designs. These tech companies make more than just outdoor lights and make other favorite gear of ours, so they’re a good brand to trust to make a usable product and app. We also like Lepro’s more affordable lights, though the app had some extra hoops to jump through to get to controls, while Lumary’s app was a brutal experience for our tester.


Our Favorite Permanent Outdoor Lights

We’ve tested a handful of permanent lights on different homes, and have a few clear favorites. These options are all ones we recommend, provided your home exterior meets the constraints mentioned above.

Govee

Permanent Outdoor Lights Pro

This model from Govee has been one of our top picks in our smart Christmas lights review for a reason, and it’s still one of our favorite models at this price point for everything you’ll get with it. WIRED reviewer Simon Hill tested the 100-foot string that came with six sections, plus an extension code. He used adhesive and screw clips to secure the light pucks and cables, and found installation easy. This is a set that you can cut and splice, but he says that isn’t a task for the faint of heart. It has an IP67 rating, and an IP65 rating for the control box. The busy companion app has everything you could want within it: color controls, tons of Scenes (Govee’s lighting effects), scheduling abilities, and even a music sync option (though that felt a little gimmicky). There’s Matter support, and Govee can connect to Alexa and Google’s ecosystems for voice control. Simon says he’d like these lights to be closer together and the design to be a little more subtle, as you can see the cords pretty easily.

Eufy

Permanent Outdoor Lights S4

WIRED reviewer Kat Merck has tested two different sets of permanent outdoor lights on her home, and Eufy’s S4, incorporating RGB with both warm and cool whites, is by far her favorite. She’s found the app incredibly easy to navigate and find the features she wants, from preset holiday scenes (120!) and colors to schedules and brightness adjustments. There’s even an AI feature that lets you create customized light shows based on moods and scenarios. They were relatively easy to install on her home, which has nonstandard architectural features, as this set has extensions and can be cut and spliced. She says the lights aren’t quite as bright as the Lumary Max set below, but the brightness is adjustable. There’s also a radar motion sensor included, which she’s still testing. The Eufy S4 set also works with the Matter protocol, so it will work with Apple, Google, and Alexa’s smart home ecosystems. It’s got a waterproof rating of IP67 like the Govee set above.

Cync

Dynamic Effects Outdoor Smart Eave Lights

Cync, which comes from appliance maker GE, makes affordable smart bulbs and other smart lights I like, so it’s not a huge surprise that I also liked the brand’s Smart Eave Lights. They were easy to install with 3M sticky strips already installed on the individual lights, and since my eaves are out of safe reach on my townhouse, I used the lights on my balcony railing with great success. One piece of the 100-foot set (it comes with four strings, plus an extension) was the perfect length to loop around my 9-foot-long railing. The set quickly connected to the Cync app, and the power cord is nice and long to make it easy to reach wherever your power outlet is. It has a waterproof rating of IP65.


If You Can’t Install Permanent Outdoor Lights

Not every home is a good fit for these types of lights. I haven’t yet found a permanent light set that works with my home, so here’s what I’ve used instead for a similar result.

Twinkly Strings Multicolor Lights on a Christmas tree

Twinkly

Strings Multicolor

These lights are photographed on a tree, but they have a weatherproof rating of IP44 (for both the lights and the power supply) to be used outside. I love how much you can customize these lights. You’ll use the app to take a photo of however you’ve set up your lights, whether that’s around the tree, around your balcony’s railing, or along the front of your house, and then you’ll be able to customize the lights and pattern based on how you arranged it. There are tons of fun light designs already in the app, and you can make your own. It’s a good option if you can only do string lights but want smart capabilities. These lights are also compatible with Amazon’s, Google’s, and Apple’s ecosystems. Twinkly also makes an icicle-style smart light string ($110), which I love using outside too; they’re currently hanging above my garage door.


More Outdoor Lights We’ve Tested

  • Cync Outdoor Light Strip for $154: I was really hoping this would be a good solution for outdoor lights for my balcony, but this light strip is heavy and tall, and better designed to use to line a yard versus sticking onto the side of a railing. It comes with grass stakes to line it.
  • Lepro’s E1 AI for $153 (50 ft): These permanent outdoor lights are completely sold out right now, but they are another more affordable option. However, they aren’t as cheap as Cync and you will have to get around the app’s AI to really get the most out of it.
  • Lumary Outdoor Permanent Lights Max ($260 for 105 ft.): Lumary’s lights were frustrating and limiting for our tester. The app wasn’t intuitive or easy to use, and our tester actually had to have the power box replaced after she tried to connect the lights to a different phone. She liked how bright the lights were, and the fact there’s a physical remote, but the app, power box shutdown, and installation limitations compared with other sets (no splicing ability, installation recommended from the left) make this one we’d skip. Lumary has since released an updated version of its outdoor permanent lights, the Permanent Outdoor Lights 2, which includes a completely redesigned app, including the addition of custom-scene saving, but we haven’t tested them yet.

FAQs

What Are the Cons of Permanent Christmas Lights?

The only real downside to permanent Christmas lights, or permanent outdoor lights of any kind, is the cost. These sets usually cost significantly more than a light string, even the smart ones. That’s because they’re designed to last longer on your home, and the more expensive sets allow you to cut and splice the cords to perfectly fit your home instead of dangling strings and extra lights. It’s an investment, but one you can enjoy year-round.

Are Permanent Outdoor Lights Worth It?

Yes, because you’ll install them once and be good to go with every holiday in your future: Christmas! Halloween! Your fave sports team headed to a big championship match! Your kid’s graduation (or your own)! Similar to how smart bulbs can give you so many options inside your home, the possibilities are endless and something you’ll be able to use and enjoy year-round.

How Does WIRED Test Permanent Outdoor Lights? What Happens When We’re Done Testing?

WIRED tests permanent outdoor lights on the homes of our reviewers. We’ve tested these lights on three different homes in separate areas with serious weather: Washington state, Missouri, and Scotland. We’ve also tested a set in the more mild climate of Southern California. We install these on the homes themselves and leave them up for at least a few weeks, if not months and years (depending on performance), to see how they hold up. Our picks remain on our homes for long-term testing, as these lights are supposed to be permanent, and used sets are safely disposed of.

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