A STUDY ON DURABILITY OF FLY ASH-CEMENT MORTARS | |
| Conference | 30th Our World in Concrete and Structures (OWICs) - 2005 |
| Authors | M. Akram Tahir*, UET, Lahore, Pakistan M. Sabir, Pakistan Railways, Lahore, Pakistan |
| Handle | 100030019 |
| Key Words | Chemical attack, fly ash-cement mortars, resistance to sulfate attack, permeability. |
| Abstract | The inclusion of fly ash as a component of concrete either as an admixture to the cement or as partial replacement of cement imparts significant enhancement to the basic characteristics of the resulting concrete, both in its fresh and hardened state. The objective of this study was to investigate the effects on the selected aspects of durability of mortars incorporating locally produced fly ash. The resistance of fly ashmortars to the acid and sulfate attack is covered in this paper. Two series of mortars were prepared by replacing 20% to 60% of cement with fly ashes obtained from two different sources. Three water-binder ratios of 0.4, 0.475, and 0.55 were used. The specimens prepared in accordance with ASTM C-267 and cured for 56 days were separately exposed to 0.5% Sulfuric acid solution and 0.5% Hydrochloric acid solution. The results of this study indicated that the resistance to acid attack of mortars containing fly ash up to 30% was better than or similar to that of the control mortars. The increase in water/binder ratio however has shown adverse effect on the chemical resistance of the mortars. It was concluded from this study that both the fly ashes improved the resistance of mortars to sulfate attack and this resistance was increased with fly ash inclusion up to about 40%. However an increase in waterbinder ratio impaired the resistance to sulfate attack. |
| Full Text |  100030019 |
| Link to this page | www.cipremier.com/100030019 |
