Xypex crystalline waterproofing admix protects priceless art in new Helsinki museum

Figure 10: The new Lasipalatsi Plaza, now the roof of the new Amos Rex Art Museum, features five domes of various sizes, each equipped with a large circular skylight.
Figure 10: The new Lasipalatsi Plaza, now the roof of the new Amos Rex Art Museum, features five domes of various sizes, each equipped with a large circular skylight.

Xypex Admix C-1000 NF was selected to provide a normal to mildly delayed set. Admix C-1000 NF is added to concrete at the time of batching and consists of Portland cement and various active, proprietary chemicals that react with the moisture and the by-products of cement hydration to cause a catalytic reaction, resulting in the formation of non-soluble crystals filling the natural pores and capillary tracts in concrete. This crystalline formation prevents the penetration of water and other liquids from any direction.

Admix C-1000 NF becomes a permanent and integral part of the concrete structure and continues to work to prevent the ingress of water and other liquids for the life of the structure. Admix C-1000 not only permanently seals the concrete and can heal hairline cracks up to 0.4 mm (16 mils), but also provides chemical-resistance properties mitigating the attack of chlorides, sulfates, and the effects of carbonation and alkali-aggregate reaction.

Figure 9: The lowest and most hydraulically susceptible structures—footings, slabs, and elevator pit—received the highest dose of Xypex Admix C-1000, which was 5 kg(11 lb)/m3. The lower level (storage area) concrete walls were dosed at 4 kg(9 lb)/m3, and the gallery level walls (just below ground level) were dosed at 3 kg(7 lb)/m3.
Figure 9: The lowest and most hydraulically susceptible structures—footings, slabs, and elevator pit—received the highest dose of Xypex Admix C-1000, which was 5 kg(11 lb)/m3. The lower level (storage area) concrete walls were dosed at 4 kg(9 lb)/m3, and the gallery level walls (just below ground level) were dosed at 3 kg(7 lb)/m3.

Project engineers consulted Xypex’s technical services team to determine the optimal dosing for Admix C-1000 NF for the concrete used at varying depths in the foundation (Figure 9). For instance, the lowest and most hydraulically susceptible structures—footings, slabs, and elevator pit—received the highest dose of Admix C-1000, which was 5 kg (11 lb)/m3. The lower level (storage area) concrete walls were dosed at 4 kg (9 lb)/m3, and the gallery level walls (just below ground level) were dosed at 3 kg (7 lb)/m3.

“The project saved money by varying the dosage based on the projected hydraulic pressure at different depths,” Ronald Sulin explains. “The water table in that area is quite high. Pumps were used during construction, before concrete was poured, to continually keep water out.”

An estimated 1500 m3 (52972 cf) of concrete was treated with Xypex. The addition of Xypex admix to the concrete used for the walls of the new museum did not impact the production, delivery, and placement of concrete in any way. By including primary waterproofing as an integral part of the foundation, the project saved the time that would have been required by other waterproofing systems such as membranes or coatings.

Figure 11: Open galleries below ground are protected from moisture intrusion for the life of the structure, thanks to the addition of Xypex crystalline waterproofing admixture.
Figure 11: Open galleries below ground are protected from moisture intrusion for the life of the structure, thanks to the addition of Xypex crystalline waterproofing admixture.

An added benefit in using Xypex is that it typically increases the compressive strength of concrete and allows the crack tolerance for walls and other structures to be increased. In many cases, less reinforcing steel can be used, thereby enabling easier and more effective concrete placement and vibration.

According to Sulin, the addition of Xypex Admix C-1000 NF allowed the museum project to move ahead without the delays other waterproofing products would have introduced, thereby saving time and money.

“Not only does Xypex meet the immediate need for a concrete waterproofing solution, but also delivers long-term benefits by providing a one-time application that never needs to be repeated or renewed. It provides active protection throughout the service life of the concrete.”

The Amos Rex art museum—named by combining the name of the Bio Rex movie theatre with first name of museum founder—opened on August 30, 2018, and handled more than 10,000 visitors in its first week of operation (Figure 10 and 11). The five-year, $64-million project has been a huge success that has revitalized an historic area by fusing the old and new to create an emersive and inclusive experience above and below the Lasipalatsi Plaza.

All information listed in this section was submitted by Xypex Chemical Corp.
Kenilworth Media Inc. and Construction Specifications Canada (CSC) cannot assume responsibility for errors of relevance,
fact or omission. The publisher nor CSC does not endorse any products featured in this article.

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