uhpc mac n cheese reference to mixing concrete

Proprietary Ultra High Performance Concrete (UHPC): What is It?

Guest blog post written by JP Binard, owner and manager of Precast Systems Engineering, LLC

At the Capital Grille restaurant, there is a side dish on the menu called Lobster Mac ‘N’ Cheese. For $20, you can get an order to your table delivered in a small cast-iron skillet. It is made with a variety of cheeses: one soft, one hard and robust, one flavorful like Havarti, and a sharp one like a cheddar. A special open-ended pasta is used to absorb the sauce better—and unlike other pastas, it isn’t rinsed or chilled beforehand. Add heavy cream, North Atlantic Lobster, and the fourth cheese (not to the sauce but after the items are combined) and the result is a dish with a unique complexity.  

This proprietary recipe is more or less shared online—but could you simply mimic a dish like this at home in a repeatable manner? It requires considerable planning to obtain a variety of ingredients from a typical grocery store, and I haven’t made it to the seafood place yet.

The less-elaborate versions of macaroni and cheese without the lobster are available in a box and proprietary by means of trademarking or a trade secret ingredient. “Proprietary” means the mix is owned, and the owner has added value because they have developed and tested a product to assure that even a novice will get the same results each and every time. 

These are easy to use and highly repeatable versions of a classic that anyone can make if they read the instructions. No special training is required, as all the steps have been designed for consistency. If you were to go camping with your family, even a serious lover of food is still likely to throw one of these pre-packaged boxes in the bag for the kids in lieu of carting around all of the specialty ingredients.   

In many ways UHPC is like macaroni and cheese—perhaps a Lobster Mac ‘N’ Cheese. Construction, in all forms, is all too often like camping with minimal resources in open air castings and with challenging environmental swings. 

For UHPC to be cast effectively and consistently, the mix must be advanced and straightforward.  

When done right, the proprietary constituents come pre-packaged, with the components measured precisely and the quality of each component monitored for repeatability. The value added is in the management of the raw materials: receipt, processing, packing, shipment, mixing technology, and onsite technical assistance. This can scale to reduce the cost of each management aspect, but they must exist in order to maintain quality and repetition, regardless of whether a UHPC is proprietary or non-proprietary.

In construction, a good example of a proprietary product we use all the time is an epoxy, in critical connections or repairs. Similarly, UHPC may also have an A, B, and perhaps a C, D, and E part that have to be mixed by instructions. The components (A through E) are precise, and the quality of each component monitored for repeatability. If the recipe is followed, the same result occurs, just like it does with epoxy.  

When implementing UHPC on a project, ask yourself if the casting environment will be like camping in the wilderness—or, will it be performed in a commercial kitchen, with all of the resources and expertise to execute the task.  

Either way, the word “proprietary” isn’t the problem; especially when it meets the end goal of a  consistent result.   

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CTL Group Material Testing Results*


Concrete Performance
Test MethodCuring Conditions at CTL Group AgeTest Results
Compressive StrengthASTM C 3973°F/100% RHat 1 day9,050 psi
Compressive StrengthASTM C 3973°F/100% RHat 3 days11,140 psi
Compressive StrengthASTM C 3973°F/100% RHat 14 days16,000 psi
Compressive StrengthASTM C 3973°F/100% RHat 28 days21,000 psi
Compressive StrengthASTM C 3973°F/100% RHat 56 days23,000 psi
Compressive StrengthASTM C 1856Controlled Curingat 28 days25,500 psi
Length Change of HHCASTM C 15773°F/50% RH28 days
(26 days Dry)
-0.033%
Chloride PenetrabilityASTM C 1202
AASHTO T277
73°F Limewater
190°F water 5 days;
190°F air 2 days;
73°F water until testing
28 days
28 days
≤100 (Negligible)
≤100 (Negligible)
** Flexural StrengthASTM C 160973°F Limewater28 daysL/600 = 2800 psi or better
** Flexural StrengthASTM C 160973°F Limewater28 daysL/150 = 1500 psi or better
Direct Tensile StrengthAASHTO T39773°F Limewater28 days1000 psi or better
Modulus of ElasticityASTM C 46973°F Limewater28 days6800 ksi
Abrasion Resistance, Ave LossASTM C94473°F Limewater58 days0.016 oz
Freeze Thaw Resistance RDMASTM A 66673°F Limewater28 days600 cycles, 96%

Notes:
*Testing results confirmed by independent laboratory CTL
Group. Results are based on laboratory mixes.
**Data per UCF Material Study 5/10/2022
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Client: Cor-Tuf UHPC CTL Project No: 059330
Date: 1/20/2020

What Makes UHPC Ultra-High Performance

UHPC achieves its superior performance through a dense nano-scale matrix that is far less permeable than conventional concrete. This matrix is combined with steel fiber reinforcement, which provides exceptional ductility and crack resistance.

Though exact formulations and results vary by producer, UHPC generally incorporates a blend of Portland cement, sand, supplementary cementitious materials, chemical admixtures, and fibers – resulting in a material dramatically stronger, tougher, and longer lasting than traditional concrete.

Cor-Tuf Outperforms Conventional Concrete and Other UHPCs

Feature Cor-Tuf UHPC Conventional Concrete Other UHPCs
Compressive Strength 25,000+ psi 4,000–6,000 psi 18,000–22,000 psi
Ease of Placement ✅ Standard Equipment ✅ Standard Equipment ❌ Specialized Tools
Bonding & Ductility Extreme Low Moderate
Freeze-Thaw Resistance 1000+ Cycles 20–80 Cycles 300 Cycles
Chloride Permeability Near Zero High Low
Lifespan 100+ Years 25–30 Years 50–60 Years

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