Behavior of Self Compacting Concrete Subjected to Sulphuric Acid

Abstract

Self-Compacting Concrete mixes (SCC) is increasingly being used in many application some of which are susceptible to an Aggressive Environment such as sulfuric acid solution. In this study SCC incorporating silica fume, chalk powder and hybrid fibers were used in casting twelve specimens with a dimensions of (1000× 200× 100) mm , in three groups. The specimens in the first group were cured in normal environment for 28 days, while those in the second and third groups were subjected to sulfuric acid solution of 0.5% for six and ten months, respectively. The flexural tests of the specimens were evaluated by testing the specimens under two-concentrated point loading until failure. The experimental results show that after chemical exposure for ten months, using of chalk powder or hybrid fibers enhances the resistance to sulfuric solution

Ultimate Load of Different Types of Reinforced Self-Compacting Concrete Columns Attacked by Sulphate

“…Other researchers have referred to the effect of using mineral admixtures on sulphate resistance with different acid concentrations [19,23]. They supported the fact that an increase in sulphate concentration increases the deterioration of SCC properties [22] and that the mineral admixtures used reduce these deteriorations, as shown in this study.…”

“…Meanwhile, the columns subjected to 4% acid solution (R1 -4%) have deteriorated in and in ultimate load. This finding proved that an increase in the concentration of sulphate acid increases the speed of acid penetration in concrete, which evidently decreases the bond between concrete and steel reinforcement [22] and weakens the load capacity of the columns, as shown in Figure 10.…”

“…In addition, when we compared the other columns using the same loads, we determined that the behavior becomes flat and soft, and the acid effect is clear for ultimate load capability, as expected. The deterioration of columns depends on the type of concrete additions used in the admixtures, the improvement of the admixtures on the concrete sulphate resistance [7,22], and, in this case, the combination of steel fibres and silica fume, which increases the compressive strength of concrete. In this study, we showed the important effect of combining silica fume with steel fibres to deal with the impermeability effect on sulphate resistance, which is reduced and improved by the combination of silica fume and steel fibres, as shown in Figure 8.…”

“…All of the above ratios were compared with the control specimen cast from SCC only, as shown in Table 7. The effect of sulphate attack has been discussed by several researchers, and all of them agree that permeability reduction using mineral admixtures or other methods enhances sulphate resistance [19,22,23].…”