New drymix plant offers hi-tech product - Builder & Renovator


With a concern that New Zealand is “twenty-five years behind Europe in the availability of drymix cement-based products,” Kiwi businessman Geoffrey Clark has invested in a new company, Cemix Drimix. The company is building a fully automated plant in Onehunga/Penrose, Auckland, to provide the New Zealand market with a wide range of drymix products that are precisely formulated.
Project manager Bhav Dhillon says that until now, there has been very little control over what happens on a New Zealand building site.

“Concrete blocks are made to fairly rigid specifications, yet builders use shovels to mix concrete and mortar dumped on site. Further legislation will tighten up on these unsafe procedures, however.”

He says Cemix’s new plant will offer consistent and low-cost products, with enhanced product performance.

“Other suppliers say sand is sand, but we split sand into three fractions and recombine them into whichever proportion is appropriate.”

With a fully functional on-site lab that will be open to its customers, Cemix will test all raw materials prior to mix, and test again after mixing.

“The lab will be one of the best in New Zealand for testing concrete and mortars, and will have a degree of sophistication that is not yet available in Australia or the United States,” he says.

Fully automated and computer-controlled for accuracy and consistency, the plant will require only four people to operate it. It is very compact, with a footprint of 8m x 8m, and a height of 33m, yet it till have the unparalleled capability to produce products with up to 17 different ingredients.

One of its salient features is that instead of using screw conveyors or air slides, the plant will use patented fluidisation technology from Raute Precision Oy in Finland – technology that makes sand and cement powders flow like liquid, enabling the use of double flap butterfly valves for accurate and high speed dosing.

Fabricated and erected in New Zealand from Raute drawings, the plant also uses a low-emission fluidised bed drier from Holland, a bucket elevator designed and built in New Zealand, compressors from the US, material lifting technology from Sweden, and a high-tech Norwegian mixer.

Bhav says the mixer is able to mix colours consistently, and also has a lightweight material dosing valve to produce lightweight concrete and Perlite plaster.

“We will initially supply dry concrete, quick-setting concrete, mortar mix, mason mix and polypropylene fibre reinforced concrete, but in time we will also be supplying oxides for colouring and white cement, as well as a wide range of sands, concretes, mortars, grouts, self-levelling flooring products and plasters.”

The plant will have the capacity to produce 15-20 tonnes of finished, bagged products per hour, or 48,000 tonnes per annum on one shift. With a fully automated bagging line, finished product will be packed and palletised into 40, 25 or 10kg bags, or into bulk bags palletised and stretch-wrapped to keep the product waterproof and fresh.

Bhav says Cemix products will be distributed throughout New Zealand by selected hardware stores.

“We aim to provide the end user with active demonstrations and point-of-sale support,” he says.

For more information, contact Bhav Dhillon at Cemix Limited (Drimix Division), 15 Alfred Street, Onehunga, Auckland. Phone (09) 634-9365, Fax (09) 636-3281, Email

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