Acidic Attack Resistance of Lightweight Concrete with SF


Present research includes studying the effect of hydrochloric acid, sulfuric acid, and hydrochloric + sulfuric acid solutions on the lightweight concrete. The lightweight concrete produced in two ways first by the use of lightweight aggregate and the second using foam. Also studied the effect of the use of silica fume with or without a supeplasticizer in the ultra-lightweight concrete on the resistance to acids solution. The author proposed to use a new method to measure the effect of acid on the concrete in addition to the traditional way, as has been proposed the introduction of hammer test to measure the resistance of hardened concrete. The study has produced important conclusions about the effect of acid on the light-weight concrete with or without additives. Although the use of silica fume increases the resistance of concrete, it's not working always to increase its resistance to acids, but on the contrary may reduce resistance to acids, especially when mixed with superplasticizer.The averages percentage decreasing in compressive strength are 43.6%, 27.74, and 49.8 for lightweight concrete, and 41.22, 42.15, and 41.09 for foam concrete and 50%, 40%, and 58.07% for normal concrete under the effect of HCL, H2SO4, and HCl+H2SO4 solutions respectively. The study proved the efficiency of hammer method to estimate the resistance of concrete to acidic solution.