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Heading: 1.1.2.1.1.1.1.1high temperature resistant concrete
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How can we make concrete resistant to very high temperatures (hundreds of degrees) ? Can addition of nano particles help in this case?


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deepika goparaju


Certainly you could use high aluminous cement concrete with a variety of different aggregate types. With respect to increasing the working temperatures and extending the service life of portland cement concrete, there has been some work published on the positive results of vacumn dewatering the freshly placed concrete. I would suspect that the addition of nano particles would also help in this case, but have no specific knowledge of their application here.
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James Mross


sir,

can the use of thermal barrier coatings(yttria-stabilized zirconia ) on aggregates be useful to make the concrete resistant to high temperatures? Can these coatings bond with cement properly?
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deepika goparaju


Clever idea Deepika! It might well be worth the trials. While I don’t have any expereience with yttria-stabilized zirconia or any other coating on the aggregate for that matter, it might have potential and could offer very interesting results. Obviously there would not be any chemical bond between paste and the coated aggregate, but in refactory applications, that wouldn’t be an issue anyway. Your interest would be in the ceramic and mechanical bond. Acting as a thermal barrier for the aggregate could help. Have you considered using crushed and sized high-alumina ingots as the aggregate? That would preclude or reduce much of the differential thermal movement between aggregate and paste.
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James Mross


What temperatures exactly? And how much repetition of thermal shock? Our admixture has been proven to make concrete highly heat resistant/survivable. One test I've participated in took identical mix design cubes into a high temp oven. The untreated concrete destructed at just over 200 degrees celsius and the treated concrete cube survived at the oven's maximum of 460 degrees celsius. Is that sufficient?
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George Clark


George Clark Sir,

Temperatures vary around 200 degrees.So the admixture is absolutely sufficient. May i have the details of the admixture?

Thank You.
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deepika goparaju


There is a cement technology called FireRok. Within 72 hours of placement, concrete made from FireRok can be exposed to intermittent high temperature environments up to 1,800ºF. It can be mixed using conventional drum mixers and is placed and finished like traditional portland cement concrete. It has been designed for areas which are exposed to high temperatures either from an intermittent or a continuous heat source. This would include runway areas exposed to jet blast, HPUs, oven and metal casting areas. Plus, the cement is 100% recycled.
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Rich Gardner


Hi Gentlemen,

Research is ongoing and final reports will be issued in the coming weeks, but we have recently taken a concrete to 1250 degrees Centigrade, which is above the standard Hydrocarbon Fire curve to the best of my knowledge, without catastrophic failure. This will be published in numerous locations in the near future.

Unfortunately, this research will not be published until then, but track this thread for information.

Steven O´Callaghan
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Steven O'Callaghan
 
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