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MSHA warns against risks of damaged welds on aerial lifts

The Mine Safety and Health Administration (MSHA) has announced damaged or defective welds on aerial

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The Mine Safety and Health Administration (MSHA) has announced damaged or defective welds on aerial lifts have caused several fatalities in the mining industry.

The MSHA says a mechanic died while being lowered in an electro-hydraulic aerial lift. A weld splice fractured on a recently repaired arm of the lift, causing the arm to strike the victim in the head. The weld failed because of poor weld quality from an improper repair, the administration adds.

Additionally, a welder died while being lowered in an electro-hydraulic aerial lift when the lift arm catastrophically fractured at a critical weld connecting the arm support to its lift cylinder. Undetected cracks existed in the weld and the surrounding metal prior to failure, the MSHA reveals.

Best Practices to Prevent the Mechanical Failure of Welded Connections

Prevent accidents by following proper welding procedures and performing regular inspections for damages or defects.

  • Only qualified welders should perform all welding.

  • Determine the service/fatigue life of mechanical systems or parts by consulting with the manufacturer.

  • Inspect welds following installation and repairs, and periodically during service life.

  • Train users in the proper operation of lifts – including not exceeding their design capacity.

  • Routinely examine metal components for signs of weakness, corrosion, fatigue cracks, bends, buckling, deflection, missing connectors, etc.

  • Use nondestructive test methods to detect cracks that may be indistinguishable to the eye.

  • Take cracked mechanical components out of service immediately. Small cracks can quickly grow and lead to catastrophic fracture.

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Source: https://www.aggregateresearch.com/news/msha-warns-against-risks-of-damaged-welds-on-aerial-lifts/

Concrete

Nov 21, Fast Setting Concrete Mix (Recipe-Ingredients-Mix Design)

I use this fast setting concrete mix for pouring all types of concrete. When you need your concrete to set up fast, this mix design will get the job done.

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A fast setting concrete mix has the following ingredients included to speed up the set time:

  1. Extra Portland Cement
  2. Water-reducing admixture
  3. Warm water (for mixing)
  4. An accelerator admixture (calcium chloride)

If you need a concrete mix that will set up fast, plan to use at least a 4000 psi mix. This type of mix has more cement than most of the regular concrete mix designs.

More cement in the mix means more heat of hydration as the concrete sets up, speeding up the curing process.

Using warm water will also help speed up the set times, especially if you’re pouring concrete in cold temperatures.

A water reducing admixture will help lower the water – cement ratio in the mix and still give you a workable mix to place your concrete. This helps with set times and improves the strength versus just using water.

Adding an accelerating admixture to the concrete will decrease set times by 10 – 30% in a lot of cases. 

cold weather fast setting mix for floors and patios






In the video above I’m using a 4000 psi concrete mix to pour this concrete floor. The concrete had 115 degree F water, 20oz of water reducer per yard of concrete, and we used two 50lb bags of calcium chloride in each truck load.

The outside temps were 32 degrees when we started pouring the floor. You can see the steam coming off the concrete as we get it spread out.

We started pouring at approximately 7 AM and we finished power troweling at 2 PM. The outside temperature never got above 41 degrees.

The most important ingredients for fast setting concrete are warm/hot water in the mix and using an accelerator like calcium chloride.

These two ingredients will speed up the set times of any concrete mix, whether it’s ready-mix or a bag mix like Quikrete or Sakrete.

does hot water make concrete set faster?

Using hot water to mix concrete will help speed up the set time by speeding up heat of hydration.

Heat of hydration is a chemical reaction that takes place when cement and water get mixed together. 

If the water is COLD, there is less heat that develops and the concrete sets up slower.

If the mix water is HOT, there is more heat that develops, which makes the concrete set up much faster.

Outside, ambient air temperatures as well as mix water temperatures HOT or COLD play a very important role in how FAST of SLOW concrete sets up. Hot = Fast and Cold = Slow (in most cases)

how do you make concrete set faster? (2 easiest methods)

The best and easiest way to make concrete set up faster is to use hot water to mix it with. If you use warm or really hot water, you’ll see an increase in the set time.

The 2nd best way is to use an accelerator like flake calcium chloride. You can use this instead of hot water if hot water isn’t available.

Most local hardware stores carry calcium chloride flakes/pellets in either 25lb or 50lb bags.

If you’re using an 80lb bag mix, only start using about 2 Cups of calcium chloride flakes to see just how fast it starts setting up and adjust up or down from there.

What is the fastest drying cement and concrete mix?

The fastest drying cement mix and concrete mix is the brand called RAPID SET from CTS CEMENT.

They have a rapid setting cement mix called CEMENT ALL. This cement mix sets up in only a few minutes and cures hard enough to walk on in 20 – 30 minutes. It comes in a blue bag or blue box at HD.

CTS also has a rapid setting concrete mix called, you guessed it, RAPID SET CONCRETE MIX. This also sets up in only minutes and has 3/8″ stone aggregate in it. It comes in a green bag and you can get it at HD.

I personally use both the Rapid Set Concrete Mix and Cement All for doing a lot of repairs and small concrete projects. Just beware, they both set up very fast. 

They actually have a “set slowing admixture pack” to slow the set and give you more working time if you think you’ll need it.

what is quikrete’s fastest setting concrete mix?

Quikrete has a RED bag called “Fast Setting Concrete MIx”. They claim is hardens in 20 – 40 minutes and can be walked on in 2 hours.

You can use this 50lb quick drying bag mix for steps, sidewalks, slabs, and for setting fence posts or a mailbox post.

This concrete mix can be used to set posts without mixing. Just dump the dry ingredients around the post and sprinkle with water for it to harden.

This mix will reach 4000 psi in 28 days.

Quikrete also has a “High Early Strength” concrete mix called Quikrete 5000. It’s not a rapid setting mix but does set up faster than their regular bag mixes. (I’ve used it for countertops)

This can be used for most anything; footings, slabs, walkways and floors. Just add some accelerator if you need it to cure faster. It’ll reach 5000 psi in 28 days. 

You can purchase either of these concrete mixes at Home Depot.

What is sakrete’s fastest setting concrete mix?

You guessed it, Sakrete has a 50lb bag called “Fast Setting Concrete MIx”. (I see a trend here)

It’ll harden in 30 minutes and you can walk on it in 6 hours & drive on it in 48 hours.

This can be used for setting posts, slabs, walkways, patios, curbs, and ramps.

It’ll reach 4000 psi in 28 days. You can get this at Lowe’s and most local hardware stores.

fast setting concrete additives – what to use

A fast setting additive for concrete mixes will greatly increase the set time and curing times of your concrete. 

Quikrete has a 1.5 lb Concrete mix accelerator that comes in a green and black box. You can add 1 or 2 of these to a 60 or 80 lb bag mix to speed up the set time. Purchase this right at Home Depot.

Sakrete has a 1 gallon bottle of “Cement Mix Accelerator” you can add to their concrete mix to speed up set time. 

How much you add and how fast they increase set times will also depend on how cold it is outside and how cold or warm the water is you use to mix with.

Another additive that’ll increase set times is flake calcium chloride. Just mix about a cup or two in the mixing water before adding your bag mix concrete. Then mix the concrete and use at as you normally would. Just move a little faster:)

We use a 50 lb bag of calcium per 5 yards of concrete when we pour concrete floors. This increases set times a lot in colder weather. Add hot water to the mix and you have a rapid setting concrete mix.

how much water do you need per bag?

Depending on which fast setting bag mix you choose, you’ll have to add the correct amount of water to achieve the best results.

Each brand is very similar when it comes to adding mix water, here is the breakdown:

  • Sakrete Fast setting concrete mix is 2.5 – 3 quarts of water per bag
  • Quikrete Fast setting concrete mix is 2.5 quarts of water per bag
  • Rapid Set Concrete Mix (green bag) is 3.5 to 4 quarts of water per bag

All these bag mixes have the mixing instructions right on the back of the bag. 

is fast setting concrete weaker than regular concrete?

The answer to that question is no, all these bag mixes are designed to reach 4000 psi at 28 days.

If you add more mixing water than the bags suggest then you could weaken the concrete. But just because it sets up faster doesn’t mean it’ll be a weaker mix.

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Source: https://www.everything-about-concrete.com/fast-setting-concrete-mix.html

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Concrete

Kryton Welcomes New Head of Sales in India

Recently, Kryton had the pleasure of welcoming Ashish Singh as the new head of sales at Kryton Buildmat Co. Pvt. Ltd. in India. Bringing over 25 years of experience in the construction chemicals industry with him, Mr. Singh comes with a good understanding of waterproofing products and technologies. He also has the knowledge necessary to […]

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Recently, Kryton had the pleasure of welcoming Ashish Singh as the new head of sales at Kryton Buildmat Co. Pvt. Ltd. in India.

Bringing over 25 years of experience in the construction chemicals industry with him, Mr. Singh comes with a good understanding of waterproofing products and technologies. He also has the knowledge necessary to work directly with large contractors as well as with distributors and applicators. With those qualities at his disposal, he is a welcome addition to the Kryton family.

Mr. Singh has worked for a variety of different companies throughout India. As a result, he has learned to manage business in the northern, eastern, western, southern, and central parts of India. He also has experience managing similar work for Sri Lanka, Maldives, Bangladesh, and Bhutan.

Throughout all that time, Mr. Singh has proven himself to be an energetic leader with a consistent record of delivering results in growth, revenue, operational performance, and profitability. Kryton is excited to see him join the team, and we look forward to working together to meet the needs of our customers.

Source: https://www.kryton.com/in-the-news/2020/11/17/10056/

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Concrete

How Concrete Can Help You Reduce In-Home Winter Allergies

Unfortunately for some, allergies aren’t just a springtime occurrence.  If you struggle year-round with pesky allergies, you may want to consider switching up your floors this winter.  Here’s why. Winter allergies and causes  Contrary to popular belief, winter allergies are definitely real even though pollen isn’t much of a concern in the colder months. Indoor
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The post How Concrete Can Help You Reduce In-Home Winter Allergies appeared first on Port Aggregates.

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Unfortunately for some, allergies aren’t just a springtime occurrence. 

If you struggle year-round with pesky allergies, you may want to consider switching up your floors this winter. 

Here’s why.

Winter allergies and causes 

Contrary to popular belief, winter allergies are definitely real even though pollen isn’t much of a concern in the colder months. Indoor allergens are the biggest culprit during this time of year, and can be caused by:

Pet dander

With temperatures dropping and pets spending more time indoors, it’s only natural that more pet dander is lingering around on your furniture and carpet these days. You may not feel allergic to your pets, but this dander can turn into dust over time and really irritate your allergies.

Mold

When picking out that Christmas tree this year, make sure you take a closer look. Sometimes, these beautiful trees can bring mold into your home. Along with this, tracking in outdoor dampness onto your carpet creates the perfect breeding ground for mold and bacteria.  

Dust mites

Dust mites are probably one of the biggest offenders when it comes to allergies. They just keep coming back and are a part of every element of your home. 

If you have a fireplace, heavy curtains or drapes can absorb the smoke odors and collect dust. Furnaces also push out mold spores and dust as they excrete warm air, and when you seal your house up to trap the heat, you trap these allergens in. Taking out those old Christmas decorations can also add dust to the air you’re breathing.

Because your floors are the largest surface inside your home, they tend to hold the most allergens–especially carpet. 

Decorative concrete floors, on the other hand, are hypoallergenic. They don’t trap in allergens and allow for easy cleanup, all the while adding a beautiful, elegant look to your home. 

In rooms where moisture is a problem (i.e., your bathroom, kitchen, or laundry room), decorative concrete can inhibit the growth of mold and mildew. Because it is non-porous and sealed, it’s also stain-resistant and easy to wipe up spills.

Mimic the look of real hardwood or stone floors and breathe easier by making the switch to concrete flooring today. At Port Aggregates, our concrete professionals pour over 40 years’ worth of experience into every project. Contact us to request a quote!

Source: https://www.portaggregates.com/concrete-can-reduce-allergies/

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