![]() ![]() Lightweight pumice aggregate for formed construction concrete. LIGHTWEIGHT CONCRETE AGGREGATE (CONSTRUCTION STANDARD) Contact us at and we’ll take care of you.Ĥ | The shopping cart system is set up to auto-calculate domestic (U.S.) shipping-for those ordering from elsewhere, please email us at and we’ll see what we can do. boxes.Ģ | For large orders (over 3 full-sized production bags), please contact us at for a freight rate.ģ | The shopping cart system occasionally glitches on an address and throws up an “order can’t be shipped to your address/location” (or similar) error message. PLEASE READ THE SHIPPING NOTES BELOW BEFORE PLACING AN ORDER.ġ | For weight-quantities over 20 lbs, shipping cost savings are typically realized by ordering a full-sized production bag (boxed) instead of multiple 20 lb. » Whitepaper: Flatline Alkali-Silica Reaction with Pumice-Blended Cement » Tip Sheet for Mixing and Placing Pumice Concrete (PDF) » Properties of Hess Pumice Aggregate (PDF) » Base Mix Designs for Pumice Concrete (PDF) » Technical Data Info: the physical and chemical properties of our pumice Learn more about mitigating ASR by downloading this whitepaper: Flatline Alkali-Silica Reaction with Pumice-Blended Cement.ĪDDITIONAL INFORMATION and SUPPORT DOCUMENTS: Without that CH, there’s no fuel to trigger ASR. 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. 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. It’s one of concrete science’s ironic truths: if lightweight aggregates (or any high-silica aggregate types) are used with Portland cement without the mitigating effects of a reactive pozzolan, the concrete inevitably develops a nasty ASR problem-a reaction between the silica content in the aggregate and the alkali in the hydrated cement paste. It’s important to know and understand that lightweight aggregates are reactive (high silica content) and need a pozzolan to mitigate ASR. Pumice is also an inert material and therefore will not react with the reinforcing steel or any other concrete component.įor additional information on pumice-based lightweight insulative concrete, visit our Pumice and Concrete website. It is this amorphous, cell-filled nature of each stone that give pumice it’s lightweight and insulative characteristics. Pumice is a porous, naturally-occuring volcanic glass, riven with air-filled vesicles formed by the expansion of trapped gasses when the molten lava is expelled into the air and flash-cools. Pumice concrete is also sound absorptive, more elastic than conventional concrete, and will not spall under direct contact with flame. Pumice concrete has superior resistance to harsh weather conditions like freezing and thawing and an R-value some four-times that of ordinary sand and gravel concrete-making pumice concrete ideal for colder climates and locations that experience dramatic fluctuations in the weather and temperature. But for limited flatwork projects and all applications where pumice concrete is vibrated into forms, (like precast applications) it presents no placement challenges beyond standard concrete and actually presents several advantages. That exception: due to the grippy nature of pumice aggregate and sand, pumice concrete takes more effort and patience to work to a standard surface finish, and for that reason is rarely used for extensive flatwork. (Download our Mixing and Placing Pumice Concrete Tip Sheet) Pumice concrete is placed and finished with typical concrete equipment and tools and is used, with one exception, for the same applications as sand and gravel concrete. Proportioning, mixing and placing are done in a similar manner to that of standard concrete. Compared to standard concrete, pumice concrete offers roughly a one-third reduction in weight and four times the r-value. PUMICE CONCRETE is composed of Portland cement, pumice stones, pumice sand, pumice powder (pozzolan), and water. Lightweight Pumice Aggregate for Craft Concrete applications. Lightweight manufactured concrete products, like stone veneer and concrete blocks, are formulated to use lightweight aggregates and sand. ![]()
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