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Peak Sand?

Re: Peak Sand?

Unread postby Tanada » Fri 29 May 2020, 12:05:14

vtsnowedin wrote:Quality concrete mixed from the right materials is such a durable product that it is worth the extra cost to ship in the aggregates rather then use lessor materials and have a product prone to failure at first stress. Look at the earthquake resistance of reinforced concrete structures vs. brick and block construction.


True for purely masonry structures, however when I was observing the construction of the new dorm at BGSU as I drove past for an appointment I noticed the masons were including mesh reinforcing between at least some courses and tying the reinforcing mesh into the wood frame structural members. Funny what you can see when stuck at a stop light waiting for university students to get out of the crosswalk already instead of dawdling along.

I imagine if you were using manufactured sandstone blocks putting layers of wire mesh between courses would go some way toward earthquake survivability though I have no idea how far an improvement it actually is. Code: Reinforced Masonry

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Re: Peak Sand?

Unread postby Newfie » Fri 29 May 2020, 20:38:25

One of the very few exports left to SOME Caribbean islands is sand and some rock. The Montserrat earthquake removed all economic activity, but gave the island an excess of sand, which they are exporting.

Maria’s torrential rains washed lots of ash down some rivers, which is being excavated and exported. So I guess some volcanic ash works as a good concrete mix.
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Re: Peak Sand?

Unread postby vtsnowedin » Sat 30 May 2020, 07:12:00

Newfie wrote:One of the very few exports left to SOME Caribbean islands is sand and some rock. The Montserrat earthquake removed all economic activity, but gave the island an excess of sand, which they are exporting.

Maria’s torrential rains washed lots of ash down some rivers, which is being excavated and exported. So I guess some volcanic ash works as a good concrete mix.

Fly ash and I presume the volcanic ash works in place of it is now a standard admixture in concrete replacing a portion of the Portland cement and improving both work-ability while placing it and early and ultimate strength.
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Re: Peak Sand?

Unread postby Tanada » Sat 30 May 2020, 08:01:22

Newfie wrote:One of the very few exports left to SOME Caribbean islands is sand and some rock. The Montserrat earthquake removed all economic activity, but gave the island an excess of sand, which they are exporting.

Maria’s torrential rains washed lots of ash down some rivers, which is being excavated and exported. So I guess some volcanic ash works as a good concrete mix.


Roman Empire concrete was a mixture of mortar aggregate and volcanic ash. It is a hydraulic cement that will harden even under water and incredibly tough with many examples still here 2000+/- years later.

The Portland cement invented in England in the 19th century is inferior in some ways but if you add volcanic ask you can get an improved modern product.
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