الفهرس | Only 14 pages are availabe for public view |
Abstract Many of reinforced concrete structures especially underground or undersea are subjected to aggressive environmental conditions during their exploitation. These conditions are represented by the aggressive sodium sulfate attack from surrounding soil or underground water. When based materials of cement are exposed to sodium sulfate attack gypsum and ettringite are produced by chemical reactions of sulfate. Formation of gypsum plays an important role in the damage of materials. According to that the actual compressive strength of concrete elements decreases accompanied with large deformations of concrete. Consequently, a higher reduction of the construction durability occurs, so the need for using an effective and economic admixture for protect concrete elements against sulfate attack or any other environmental conditions is required. The main purpose of this research is to study experimentally the effect of the local admixture (BM2010) and its mechanism effect on the compressive strength of concrete specimens subjected to external sulfate attack. The suggested admixture which containing in their compositions wastes from industries (BM2010) generally has a good effect on increasing compressive strength and decrease the absorption of concrete cured in different Salt solution concentrations with two types of cement (S.R.C & O.P.C) and two types of concrete strength (C600 & C350) and helped the concrete specimens successfully to reach to high performance concrete. Also showed a better influence on durability of concrete (exposed to 50 cycle of durability). The suggested admixture (BM 2010) can be used successfully as an effective and economic admixture to protect different concrete elements against sulfate attack or any other decayed environmental conditions. |