Symptoms for aggressive water attack?
(a) It will show disintegration of the concrete evidenced by loss of the cement paste
(b) It will show concrete surfaces that are very rough in areas where the paste is leached
(c) Affected concrete does not exhibit telltale features too distinctly
(d) Expansion does not occur without reaction products
The question was asked by my school principal while I was bunking the class.
This intriguing question comes from Symptoms and Diagnosis of Distress topic in chapter Repair Technology for Concrete Structures of Concrete Technology