What is Mivan technology
Introduction
-It was developed by MIVAN Company Ltd. from Malaysia in the 1990s for constructing mass housing projects in developing countries.
-MIVAN Company Ltd. began manufacturing these formworks, hence giving the name “MIVAN Technology”
-MIVAN formwork technology uses aluminium alloy formwork into which concrete is poured into making a mould.
-The system of aluminium forms (MIVAN) has been used widely in the construction of residential units and mass housing projects. It is fast, simple, adaptable and cost – effective.
-This system is most suitable for Indian condition as a tailor–made aluminium formwork for cast–in–situ fully concrete structure.
Features of Mivan technology
1. Sheet thickness and size of panel
-The concrete wall panel is 5mm thick.
2000*600, 2000*300, 1200*300, 850*300 are the standard sizes of panels.
-Any other required size as per the requirement can be manufactured and delivered to the site.
-Panels reusable upto 250 times
2. Load carrying capacity
-It has 7-8 tonnes per square meter capacity.
-Due to use of aluminium as a material, it is light in weight.
-It weigh around 18-20kg per square meter.
3. Striking time
Vertical formwork - 12hours after concreting or when concrete attends a strength of 2N/mm2
Horizontal formwork – 36hours after concreting or when concrete attends a strength of 10N/mm2
4. Cycle Time
-High speed of construction can be achieved by this system that means faster completion of project.
-5 Days per floor.
Fig. Shows Mivan shuttering
Mivan floor cycle (5 days )
The formwork assembling at the site is a quick & easy process. All formwork begins from corners and proceeds from there.
The system usually follows a 5 day slab cycle: -
Day 1: The first activity consists of erection of vertical reinforcement bars
Day 2: one side of the vertical formwork for the entire floor or a part of one floor.
Day 3: The second activity involves erection of the second side of the vertical formwork and formwork for the floor
Day 4: Fixing reinforcement bars for floor slabs
Day 5: After completion of all checking, Casting of walls and slabs.
Removal of vertical form work panels after 24hours, leaving the props in place for 7 days and floor slab formwork in place for 2.5 days.
Advantages of Mivan technology
-Uniformity in all components of structures.
-There is no need of block work
-Wall and slabs have smooth surface, which eliminates internal Plastering work
-This technology makes the structures more seismic resistant and durable as well
-Casting of all structural member is done at a single pour of concrete.
-Scrap value is high.
-Can be erected using unskilled labours and without the removing of props, deck panel can be removed
Disadvantages of Mivan technology
-Due to casting of all members, any modification is not possible to carry out.
-Due to presence of shear wall, heat of hydration is high.
-Initial cost is high
-Not suitable for small scale projects.
-Wall and slab may show cracks due to shrinkage
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