Abstract

Concrete stability has become one of the most important considerations in construction industries in recent years. Concrete is vulnerable to acid and salt attack because of its alkaline nature. The financial losses associated with infrastructure deterioration due to acid and salt attack exceed trillions of naira all around the world. An experimental investigation into the behaviour of sustainable concrete in 10% sodium chloride environment by replacing cement with combination of cassava peel ash and egg shell powder. Mix proportions 1:2:4 with water/cement ratio of 0.45 was used. The partial replacement of cement in concrete with CPA and ESP of 0, 5, 10, 20, 30 and 40% respectively by weight of cement were investigated in accordance with standard procedures. CPA and ESP were mixed in a proportion of 10:90, 20:80, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80 and 10:90 respectively for the partial replacement of 0, 5, 10, 20, 30 and 40% by weight of cement and cured for a periods of 3, 7, 28, 60, and 90 days on the compressive strength tests of concrete were investigated and also the effect of sodium chloride (NaCl) concentrations 10%, exposure periods of 7, 14, 21 and 28 days on the compressive strength of concrete were investigated. It was found that the compressive strength loss of concrete in these acid environments was severed, when cement was replaced by CPA/ESP. This mix also showed high mass loss when exposed to these salt.