INFLUENCE OF THE CEMENT TYPE ON THE RESISTANCE OF CONCRETE TO FEED ACIDS

Concrete in animal houses is subject to aggressive substances from fee d and manure. Chemical attack by the most important feed acids, lactic and acetic acid and abrasion caused by animals and cleaning, were sim ulated and studied using accelerated corrosion tests. The resistance o f concrete prisms with different cement types and approximately consta nt water-to-cement ratio, to simulation liquids with different pi-I-va lues, was investigated. The decrease of volume in terms of percentage and the mass loss per unit area were measured, as well as the pa-chang e and calcium content of the liquids. It appeared that the cement type had an important influence on concrete resistance in the highly to ve ry highly aggressive simulation liquids. Four groups with decreasing v ulnerability to the attack were distinguished: portland cement without C(3)A, ordinary portland cement, cement containing fly ashes, blastfu rnace slag cement. The percentage of slag in the slag cement and the c ement content of the pozzolanic cement had no significant influence. C opyright (C) 1996 Elsevier Science Ltd