Aloha! Rockster Impactor Contributes to Sustainability of the Hawaiian Paradise 

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Crushing coral with the Rockster R700S impactor on a 3-acre processing yard from Alakona Corp in Honolulu. with the Pacific Ocean in the background. Final fractions 1 ½-3” and 1 ½ “minus.
Alakona Corp from Honolulu relies on a high-quality Austrian crusher brand to process RAP and coral with their new R700S Rockster portable crushing plant.

After a long cruise over the Atlantic Ocean through the Panama Canal, and across the Pacific, Rockster’s mobile Impact Crusher R700S reached the paradisiac Hawaii - more precisely the island of Oahu. Arist de Wolff and his team of 25 motivated employees were very excited about the arrival of their brandnew Austrian crushing plant. Alakona Corp, founded in 1982 by Arist’s father Mervyn de Wolff, is an asphalt paving and paving maintenance contracting firm, situated in the Hawaiian capital, Honolulu. Alakona Corp serves Oahu and the neighbor islands, with a wide list of clients that includes Federal, State, City and County governments, commercial enterprises, developers, property managers, condominium associations and individual owners. At the very beginning, Alakona Corp focused on pavement maintenance with emphasis on slurry seal, seal coating and minor asphalt repairs. During the recent years the company has moved toward its present service/product mix, deriving its income from asphalt repair, asphalt overlay, new asphalt lay, pavement maintenance, as well as slurry seal, seal coat and crack fill.

A very successful family business. FLTR – Operator Jon Keck, Owners Mervyn de Wolff, Betsy Wilson, Max de Wolff and Arist de Wolff with his wife and their two girls.

Alakona’s Perfect Crusher is Designed & Produced in Austria

Alakona owns several machines they need for their core business like pavers, rollers, loaders, excavators, slurry and seal coat applicators. When they searched for a crusher to expand their business, they put their focus on compact machinery below 25 tons, which exactly fits their fleet. ”We feel that Austrian engineers are really honest. Wolfgang Kormann explained in detail how the machine could be beneficial to us and it is true. We are so flexible in terms of processing different aggregates and the material we produce with our crusher is of high value. We do also like the fact that the return belt can be turned aside, and we can make another fraction, as well as the fine side belt that can be pulled off. The screen box is also very beneficial as it allows us to produce different material sizes by just switching some screens. There are some options that others don’t have, and we are very enthusiastic about the hydrostatic drive”, says Arist de Wolff. Thanks to this drive system, the performance of the R700S is constantly high, as the hydrostatic pressure always adjusts to the power requirements of the crusher. This leads to a lower diesel consumption per tonne of production because the diesel engine always stays within the optimum speed range.

Currently, Alakona crushes about 5,000 tonnes a month with the R700S impactor.

The New Line of Business: Processing of RAP

Für Alakona war es ein logischer Schritt, den Fokus der künftigen Expansion auf Recycling und Natursteinaufbereitung zu legen. “Naturstein wird besonders auf einer kleinen Inselgruppe wie Hawaii nicht ewig verfügbar sein, in absehbarer Zukunft müssten wir ihn vom Festland einführen. Nachhaltigkeit ist der Schlüsselfaktor. Wir benötigen viel Material für Straßenunterbau oder Füllungen. Die Verwendung von aufbereitetem Asphalt anstelle von natürlichen Zuschlagstoffen spart Ressourcen und Geld. Darüber hinaus enthält recycelter Asphaltbruch etwas Bitumen, es verhält sich wie Klebstoff, der zu mehr Verdichtung führt und somit zu einer stabileren Tragschicht beiträgt“, erklärt Arist de Wolff. Mit Hilfe des Rockster Siebsystems bricht Alakona seinen Altasphalt mit einer Aufgabegröße von 0/600 auf 0/32mm Endkorn. “Wir führen eine Reihe von Tests wie zB den ‘CBR‘ durch, um sicherzustellen, dass das recycelte Material für die Wiederverwendung in unseren Bauprojekten geeignet ist”, fügt er hinzu. Der CBR-Test (Californian Bearing Ratio) ist ein Penetrationstest zur Bewertung der Untergrundfestigkeit von Straßen und Gehwegen.

Ever Heard of Coral Crushing?

It was a logical step for Alakona to put emphasis on a recycling business. “Obviously, natural rock isn’t gonna be there forever, in future we would have to ship it in from the mainland. Sustainability is the key factor. We need a lot of material for subbases, base coarse or backfills. Using Reclaimed Asphalt Pavement instead of natural aggregate saves resources and money. Moreover, RAP contains a bit of bitumen, it is like a glue, holding everything together and giving more compaction”, says Arist de Wolff. Using the attached screening system, Alakona crushes asphalt from 1 ½ ‘ – 2 ‘ to 1 ½” minus of a final size material. “We’re doing a bunch of tests like the CBR, to make sure the final material is suitable for reuse in our construction projects,” he adds. The Californian Bearing Ratio (CBR) test is a penetration test used to evaluate the subgrade strength of roads and pavements.

The R700S weighs 52,900 lbs with screen box and return belt, which can be easily transported with Alakona’s own truck.

Easy Transport Facilitates Entry in Contracting Business

With a screen box and return belt, the Rockster R700S weighs only 52,900 lbs (24 tons) and can be easily transported with Alakona’s own flatbed truck without the need of transport permits. This gives them great flexibility in terms of their future plans, to get a foot in the door of contracting business. It also saves them a lot of time and money. “We are able to crush so many kinds of material. Within 4 days of training this summer, we crushed RAP, coral, concrete and basalt. There are so many possibilities for a lot of different customers like construction companies, privates and of course municipalities. You would think that people on an island would be more aggressive into researching, testing and using recycled material, but they are hesitant in trying new things. It needs to be pushed more and people need to understand that this is the future. There needs to be recycled material especially in construction fields where we could save so much natural resources,” Arist says.

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