This paper presents a detailed study of parameters that makes concrete resistant to ammonium nitrate (NH₄NO₃) fertilizer attack. The major goal of this research work is to study the effect of ammonium nitrate on the strength and microstructure of silica fume (SF) composite concrete by performing microscopic testing techniques. X-ray diffraction (XRD) & Scanning Electron Microscopy (SEM) were used to study the mineral & chemical compositions of deteriorated samples. Cylindrical specimens were prepared by using silica fume as a partial replacement of cement i.e. 0%, 5%, 8%, and 10% in order to fulfill the requirement of impermeability of concrete specimens towards NH₄NO_3. The results show that compressive strength varies with the variation in SF content. Composite Concrete specimens for all percentages of SF were subjected to a 5% solution of NH₄NO₃ and its deleterious effect on concrete was accelerated using alternate wetting and oven drying cycles. SEM and XRD results showed the production of calcium nitrate as a product of deterioration. It is concluded that concrete samples with SF content of 8% have shown significant improvement in strength and more resistant to the NH₄NO₃ attack as compared to the other samples.

本文详细介绍了使混凝土抵抗硝酸铵（NH ₄ NO ₃）肥料侵蚀的参数的研究。这项研究工作的主要目的是通过执行微观测试技术来研究硝酸铵对硅粉（SF）复合混凝土的强度和微观结构的影响。X射线衍射（XRD）和扫描电子显微镜（SEM）用于研究劣化样品的矿物和化学成分。通过使用硅粉作为水泥的部分替代品（即0％，5％，8％和10％）来制备圆柱试样，以满足混凝土试样对NH ₄ NO ₃的不渗透性的要求_。结果表明，抗压强度随SF含量的变化而变化。将所有百分比SF的复合混凝土样品置于5％的NH ₄ NO ₃溶液中，并通过交替的润湿和烘箱干燥循环来加速其对混凝土的有害作用。SEM和XRD结果表明，硝酸钙的产生是变质的产物。结论是，与其他样品相比，SF含量为8％的混凝土样品在强度上有显着提高，并且对NH ₄ NO _3的侵蚀更具抵抗力。