Sometimes The Side Of Concrete Bridges Is Observed To Turn Black In Colour. What Is The Reason For This Phenomenon?
Posted by Sudheer Kumar Raaju
13 Jun, 2012
Question :Sometimes the side of concrete bridges is observed to turn black in colour. What is the reason for this phenomenon?
Answer In some cases, it may be due to the accumulation of dust and dirt. However, for the majority of such phenomenon, it is due to fungus or algae growth on concrete bridges. After rainfall, the bridge surface absorbs water and retains it for a certain period of time.Hence, this provides a good habitat for fungus or algae to grow. Moreover, atmospheric pollution and proximity of plants provide nutrients for their growth. Improvement in drainage details and application of painting and coating to bridges help to solve this problem. Reference is made to Sandberg Consulting Engineers Report 18380/X/01.
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Question :Sometimes the side of concrete bridges is observed to turn black in colour. What is the reason for this phenomenon?
Answer
In some cases, it may be due to the accumulation of dust and dirt. However, for the
majority of such phenomenon, it is due to fungus or algae growth on concrete bridges. After rainfall, the bridge surface absorbs water and retains it for a certain period of time.Hence, this provides a good habitat for fungus or algae to grow. Moreover, atmospheric pollution and proximity of plants provide nutrients for their growth. Improvement in drainage details and application of painting and coating to bridges help to solve this problem. Reference is made to Sandberg Consulting Engineers Report 18380/X/01.