抗硫酸盐侵蚀混凝土配比方案的比较研究【优秀毕业论文】.doc

- PAGE I - 本科毕业设计 （20 届） 抗硫酸盐侵蚀混凝土配比方案的比较研究 所在学院 专业班级 工程力学 学生姓名 学号 指导教师 职称 完成日期 年 月 PAGE II PAGE I 摘要 摘要：混凝土是以砂、石为主要骨料，以水泥为主要胶结原料形成的固体混合物。虽然混凝土是一种人造石材，但它通常具有和天然石材像类似的耐久性。因此在人们的传统观念里，总是认为混凝土的耐久性是完美的，从而在19世纪之前，对其耐久性没有进行仔细的研究。实际上，混凝土和钢筋混凝土的强度和刚度在使用过程中，都会受到环境中有害介质的侵蚀，例如存在于土壤、空气以及水中的有害介质。 在海洋环境中，硫酸盐侵蚀是导致混凝土耐久性降低的主要原因。现在，我国提出了以交通、建筑等等方向的节能工程，人们已经意识到提高基建工程的耐久性，就是最大的节能减排。故研究抗硫酸盐侵蚀的混凝土新配方是非常必要的和重要的。 本文主要研究不同的混凝土配方抗硫酸盐侵蚀能力的大小。按照不同配方，制作出实验试样，然后采用干湿循环的实验方案来加速实验进程，采用这种方法，我们能够获得哪种配方的抗硫酸盐侵蚀侵蚀能力更强。采用超声波检测技术，测试实验试样首波波幅沿试样长度变化的衰减规律以及试样波速变化规律。根据实验结果，可以确定哪种配方抗硫酸侵蚀能力较强。 关键字：混凝土；实验研究；抗硫酸盐侵蚀；超声波检测；配合比设计。  Abstract: Concrete can be considered as a composite, in which sand and gravel are used as the main aggregates, and cement is adopted as the cementation material. Although concrete is not a natural but an artificial stone, its durability is usually similar to that of the former. Therefore, in peoples traditional view, the durability of concrete is always considered as perfect so that the durability has not been carefully studied before the 19th century. In fact, the strength and stiffness of concrete and reinforced concrete will be reduced due to the effect of environment, such as the erosion of harmful medium existing in soil, air and water. In marine environment, the durability of concrete will be significantly affected by sulfate attack. Now, our country puts forward a series of energy conservation projects in transportation, construction and so on. It has been realized that improving the durability of engineering constructions is the greatest energy saving. Therefore, the study of concrete mix design for sulphate resistance is important and necessary. The properties of sulfate resistance for different concrete mix design are studied in this paper. According to various concrete mix design, specimens of concrete are formed. Experimental process is accelerated