Sarawak State Stadium repair works

Hi there!!! Today i would like to write a little bit about my waterproofing/building solution experience. In my line of work with Perritech, I involved a lot of my time with waterproofing project around Sarawak. So today i would like to share my experience for every materials i have use and the projects i involved with.

I used many chemicals from SIKA and PLC. SIKA is a renown company specialize with building solution chemicals and materials. You can visit their site at www.sika.com. It is founded in Switzerland by Kaspar Winkler. PLC Laboratory on the other hand, is a Malaysian based company that was establish by a group of coating professional to carry out R&D and manufacturing of advance coating material here in Kuala Lumpur, Malaysia. It is established on 1995 and one of the leading chemical manufacturer in Malaysia.


Project : Sarawak State Stadium repair works
System used :

• Joint repair (Combiflex system)
• Sikadur 31CF Normal
• Sikdur Combiflex
• Monotop system
• Sikaflex sealant
  
  

This combiflex system consists of several layers of materials on top of each other. Surface preparation is needed for this system, a least a inch of depth needed to be hack off either vertically or horizontally depending on the leaked joint. After measuring and hacking, the first thing is to apply Sikadur 31 CF Normal on the hacked surface followed by the combiflex rolls cut into suitable size.

After laying the rolls, apply the epoxy sikadur 31 again with allowance of 2-3mm space in the middle. Lastly, after the epoxy dried up, monotop system is applied on top of the epoxy and wait until it dry then sealant is apply on the middle space.

This system is suitable for joints that are susceptible to movement over time as the combiflex rubbery rolls will move along with the structural movement.

Finish works for inspection

• Joint repair (Polyurea system)
• PLC 118ST (Epoxy)
• PLC 690 SPUA
• PLC 310 PU

I never see how specialist applied polyurea before nor i ever heard of it in my 8 years of studies. It is an act of mixing resin (hardener) with polymer (colored) in a high temperature mixing by a special sparying maching ( we just called is polyurea machine). The air for spraying is supplied by a diesel compressor.

 

This is the spraying machine

and the spray gun would look like this

and the compressor should look like this

So our job is to waterproof the leaked "T" pre-cast slab on every level of the stadium. We can achieve around 100 square meter per day if everything is okay. Polyurea can dry up pretty fast, in the region of 5 to 15 seconds so careful planning needed to be done in terms of polyurea joint lapping and the surface profile.

After

Before

Polyurea is a tough and durable system making it suitable for any possible areas. IT can be stretch up to 400% of its original length. You can even apply it inside a concrete water tank to make the tank waterproof and it is 100% safe for drinking water.

• Structural cracks repair
• Sikadur 31CF Normal
• Sikadur 52MY

Structural cracks is quite simple to repair and there is a lot of methods. Epoxy resin injection is one way to do it. It is a simple work where the epoxy resin is injected in the prepare cracks by a pump (hand or mechanical). We need to place a pecker (some sort of receiving plastic hard tube for the injection), covered the cracks and the pecker with an epoxy mortar (Sikadur 31CF Normal), wait for it to harden atleast a day and then we can inject it directly.