تأثير هجوم الاملاح الكبريتية الخارجية على الخرسانة

Abstract

This research is deliberate the effect external sulfate attack on Compressive strength concrete with 1 : 1.5 :3 mix ratio and cement content 380 kg / m3 with curing age 28 days in ordinary water then complete immersed in three different sulfate solutions of magnesium, sodium and calcium at four levels 0%, 2%, 4% and 6% each for three exposure periods of 60, 90 and 120 days. This four levels sulfate solutions is used because same natural sulfate subsistent in groundwater , soils which surrounding concrete . Results tests of Compressive strength for all specimens immersed in different sulfate solutions show that Magnesium sulfate had the most deleterious effect on the concrete compressive strength especially when exposed in 6% for 120 days which record 24.44 MPa compare with referential 30.87 MPa with strength loss20.82- % . Calcium sulfate had the least effect with strength reduction most 9.43- % for specimens which immersed in it , and 16.74- % strength loss with in sodium sulfate in 6% for 90 days for each of them compare with referential .