Tremix, as is popularly known in India, is actually Vacuum Dewatering process of concrete. It was originally invented by Tremix AB, Sweden many years ago. This process was introduced in India by Aquarius Technologies in 1987. It became so popular in India that almost everybody related to concrete flooring industry, may be manufacturers / contractors / consultants started calling this process by the name of its inventor.
The process essentially comprises of concrete levelling by Surface Vibrators, removal of excess water with the help of Vacuum Pump and Suction Mats, and finishing the hardened concrete by Skimfloater / Power Trowel. If applied correctly, this process gives definite advantages i.e. higher compressive strength, even finish, better joints, increased wear resistance, less curing time etc. (please refer the Product catalogue for more information). The key part in this process is the Vacuum Pump, Top Cover and Filter Pads as the performance of these determines the effectiveness of the process. Bubble shaped Filter pads gives the best results as there is always free space for water to flow. The substitutes which are commonly found on sites are made of Nylon nets and do not dewater the concrete correctly as there is no passage for water to flow. The effectiveness of dewatering can be easily seen after the dewatering is stopped. For correct dewatering, the filter pads remain clean without any slurry sticking to them and concrete surface completely dry. Another test is the dewatering time; it should be done for 1 – 1.5 minutes per centimetre thickness of concrete. Dewatering time depends on thickness and not on area being dewatered.
The reason for the popularity of this process in India is that it is semi automatic. It came when water was the only material available for adjusting slump. Concrete was required to be produced at site by 7/10 mixers in relatively small quantity. It gave the freedom from 4 x 4 metres panels and allowed stripped construction as long as 40 mtrs thereby increasing daily production.
(For more information, see Section Concrete Flooring Equipments catalogue)