ENGINEERING COMPETITIONS are all kinds of practical fun. And the American Society of Civil Engineers’ National Concrete Canoe Competition (NCCC) ranks as one of the most anticipated and successful.
At Hess Pumice, we field scores of inquiries each NCCC season about sourcing our lightweight pumice aggregate and natural pozzolans. We added this page on the Pumice Store to expedite and streamline the process. We’re happy to sponsor teams designing and building pumice concrete canoes by providing our lightweight pumice aggregate at no cost: we ask only that the NCCC teams cover the cost of shipping.
Please use the following link to download a vector-based PDF Hess Pumice logo file to use on your team’s “our awesome sponsors” materials. We would also appreciate a few photos of your team and your boat when complete. (email ’em to: firstname.lastname@example.org). Thanks!
Sourcing our pumice aggregate and pozzolans for your competition boat is a two-step process:
1) MIX DESIGN / LAB SAMPLES: Teams typically start with small testing samples to use to zero in on the right concrete mix design. The BUY NOW buttons below allow you to immediately order the testing samples you want to work with and get them on the way. The grades you see available to order are the typical grades requested over the years. (see Lightweight Aggregates Need a Pozzolan paragraph, below)
2) CANOE CONSTRUCTION AGGREGATE AND SAND: When you're ready to order the pumice aggregate and pumice sand, send an email to Joel at email@example.com and tell him which grade(s) and how much you need. Joel is a logistics expert: he'll find you a sweet freight rate. Be sure and include all of the information below in your email.
|INFO TO INCLUDE IN AGGREGATE REQUEST E-MAIL:|
|Your Name and the Team Name|
|Your Contact Information (cell and email)|
|Pumice Grade(s) wanted and Quantity Needed of each|
|Physical Shipping Address (accessible by LTL truck)|
LIGHTWEIGHT AGGREGATES NEED A POZZOLAN:
It’s one of concrete science’s ironic truths: lightweight aggregates are reactive, and if used with ordinary Portland cement without the mitigating effects of a reactive pozzolan, the concrete inevitably develops a nasty ASR problem—a reaction between the high silica content in the aggregate and the alkali in the hydrated cement paste. The alkali-silica reaction forms expansive gels that generate a sort of slow-motion explosion, map-cracking and eventually destroying concrete structures from the inside out. Adding a high-quality pozzolan—and here’s where the irony lies—made from the same pumice as the aggregate, but milled to a fine powder, ignites an immediate (secondary) reaction within the hydrated lime paste, consuming the deleterious calcium hydroxide (CH) generated by the primary cementitious reaction. Without that CH, there’s no fuel to trigger ASR.
Pozzolan is defined in ACI 116R as: “…a siliceous or siliceous and aluminous material, which in itself possesses little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to form compounds possessing cementitious properties.”
Learn more about natural pozzolans at the National Pozzolan Association and Hess Pozz websites. Also download the whitepapers: Flatline Alkali-Silica Reaction with Pumice-Blended Cement and How Pumice Pozzolans Super-Charge Concrete Performance.
ADDITIONAL INFORMATION and SUPPORT DOCUMENTS:
Chemical Data: Physical and chemical properties of our pumice.
Technical Data Sheets: TDS sheets (PDFs) for each grade are linked in the grade product tables below.
ASTM C330 Declaration (PDF)
Other pumice-centric Declarations & Certifications
Pumice Safety Data Sheet (SDS) (PDF)
Logo: Hess Pumice Logo (Vectorized PDF)
Whitepaper: Flatline Alkali-Silica Reaction with Pumice-Blended Cement
Whitepaper: How Pumice Pozzolans Super-Charge Concrete Performance
Website: Pumice and Concrete
Website: Hess Pozz (Pumice: the Original Pozzolan)
Website: National Concrete Canoe Competition (Official site)
|HESS POZZ (DS325)|
|Used in general construction concrete mix designs as well as downhole slurries. Super-charges concrete performance: reduces heat of hydration cracking, mitigates alkali silica reaction, innoculates against chemical attack, densifies and esclates strength overall. Used as a percentage of cement replacement (10% to 40%).
» Size/Grade: DS325 (90% to 100% passes a 325 mesh)
|Technical Data Sheet (PDF) for DS325|
|BUY HESS POZZ (DS325)|
|HESS ULTRAPOZZ (NCS-5)|
|An ultrafine (5 micron) pumice pozzolan for speciality concretes. Typically used for glass fiber reinforced concrete (GFRC) panels and products, crafted stone veneer products, statuary, lime plasters and so on.
» Size/Grade: Hess UltraPozz (NCS-5 | 3 to 6 microns)
|Technical Data Sheet (PDF) Hess UltraPozz|
|BUY HESS ULTRAPOZZ (NCS-5)|
|PUMICE SAND (FINE)|
|Fine pumice sand.
» Size/Grade: Hess Grade #2 (3% to 15% passes through a 50 mesh)
|Technical Data Sheet (PDF) for Hess Grade #2|
|BUY PUMICE SAND (FINE)|
|PUMICE SAND (COARSE)|
|Coarse pumice sand.
» Size/Grade: Hess Grade #5 (0 to 12% passes through a 30 mesh)
|Technical Data Sheet (PDF) for Hess Grade #5|
|BUY PUMICE SAND (COARSE)|
|PUMICE AGGREGATE (XSMALL)|
|Extra-small pumice stones.
» Size/Grade: Hess Grade #7 (55% to 75% passes through a 14 mesh)
|Technical Data Sheet (PDF) for Hess Grade #7|
|BUY PUMICE AGGREGATE (XSMALL)|
|PUMICE AGGREGATE (SMALL)|
|Small pumice stones.
» Size/Grade: Hess Grade #10 (0 to 15% passes through a 14 mesh)
|Technical Data Sheet (PDF) for Hess Grade #10|
|BUY PUMICE AGGREGATE (SMALL)|
|PUMICE AGGREGATE (1/8+FINES MN)|
|A wide-spectrum grade with a top end of 1/8-inch stones (8 mesh) and a bottom end passing (0 to 15%) a 200 mesh.
» Size/Grade: 1/8 Fines MN (up to 1/8-inch stones; extensive fines/sand)
|Technical Data Sheet (PDF) 1/8 fines MN|
|BUY PUMICE AGGREGATE (1/8+FINES MN)|
|PUMICE AGGREGATE (3/8 x #8 MN)|
|A low-fines grade with a top end of 3/8-inch stones (3/8 mesh) and a bottom end (0 to 20%) passing an 8 mesh.
» Size/Grade: 3/8 x #8 MN (primarily 3/8 to 1/8-inch stones; few fines/sand)
|Technical Data Sheet (PDF) for 3/8 x #8 MN|
|BUY PUMICE AGGREGATE (3/8 X #8 MN)|
CONTACT US: firstname.lastname@example.org
CATALOG: COMMON PUMICE GRADES