An old industrial city on the river
Narayanganj is one of Bangladesh's oldest industrial centres. Along the Shitalakshya, around Fatullah, Siddhirganj, Kanchpur and Rupganj, knitwear units sit beside dyeing and finishing plants, warehouses and older jute-era structures. The age and use of these buildings shape what we find.
What we see most often
- Corrosion. Steam, moisture and chemicals from dyeing and washing plants accelerate reinforcement corrosion, causing cracking and spalling.
- Vibration and heavy machinery in knitting and dyeing floors.
- Riverside ground: soft, saturated soils near the Shitalakshya and Buriganga where settlement and foundation capacity need checking.
- Older buildings with no surviving drawings.
Our approach here
Assessments in Narayanganj usually include carbonation and half-cell testing alongside cores, so corrosion is measured before repairs are designed. Repair schemes combine removal of contaminated concrete, treatment of reinforcement and protective coatings with strengthening where section loss is significant.
Questions from Narayanganj
Why do dyeing factory buildings corrode faster?
Constant moisture, steam and chemicals let carbonation and chlorides reach the reinforcement sooner, so the steel rusts and expands, cracking the concrete cover.
Can corroded columns be repaired?
Yes. Contaminated concrete is removed, the steel is cleaned or supplemented, and the section is rebuilt and protected. Where steel has lost significant section, the member is strengthened.