阿利特—硫铝酸钡钙水泥混凝土力学性能和耐久性研究

发布时间：2018-10-17 13:46

【摘要】：本研究采用阿利特-硫铝酸钡钙水泥,通过配合比设计和试验室试配,配制出了工作性良好的阿利特-硫铝酸钡钙水泥混凝土,并开展了一系列相关的研究。主要研究内容有:随水胶比的不同,其抗压强度、抗折强度等力学性能以及抗渗性能、抗氯离子渗透性能、耐火性能和抗冻性等耐久性能的变化规律;并与相同配比的普通混凝土的相应性能进行对比研究。取得的主要研究结果和结论如下:(1)与普通硅酸盐水泥混凝土一样,阿利特-硫铝酸钡钙水泥混凝土的抗压强度也随水胶比的增大而减小。在相同配合比和养护龄期条件下,阿利特-硫铝酸钡钙水泥混凝土的抗压强度,尤其是早期抗压强度明显高于普通硅酸盐水泥混凝土,后期强度稳定发展。(2)阿利特-硫铝酸钡钙水泥混凝土的抗渗性能较普通硅酸盐水泥混凝土更好一些,普通硅酸盐水泥混凝土的相对渗透系数最大可达阿利特-硫铝酸钡钙水泥混凝土的40倍。(3)掺粉煤灰的阿利特-硫铝酸钡钙水泥混凝土的早期强度降低,但后期强度增长较快,其增长率高于未加掺合料的同类混凝土;掺合料的加入明显改善混凝土的抗渗性能,且随掺合料的增加逐渐增大;抗冻性能随粉煤灰掺量的增加而降低。(4)通过对混凝土各龄期的水化样进行XRD分析、SEM-EDS分析、孔结构分析等测试技术,研究发现阿利特-硫铝酸钡钙水泥混凝土结构中的水泥,骨料界面结合较普通水泥混凝土更好,水化产物的粒径分布更为均匀,熟料颗粒基本上被水化硅酸凝胶包裹,使其结构变得更为致密。粉煤灰的掺入,使胶凝材料颗粒的填充性和凝胶体的孔结构得以改善,孔径减小了,同时有害孔的数量也减少了,使混凝土的抗渗性能提高了。
[Abstract]:In this study, alite-barium aluminate calcium cement was used in this study, and a series of related research was carried out through mix ratio design and laboratory test to prepare alit-barium aluminate calcium cement concrete with good workability. The main research contents are as follows: with the change of water-binder ratio, the variation of mechanical properties, such as compressive strength, flexural strength, impermeability, chloride ion permeability, fire resistance and freezing resistance, etc. And the corresponding performance of common concrete with the same ratio is compared and studied. The main results and conclusions obtained are as follows: (1) the compressive strength of alit-barium aluminate cement concrete decreases with the increase of water-binder ratio. Under the same mix ratio and curing age, the compressive strength of alit-barium aluminate cement concrete, especially the early compressive strength, is obviously higher than that of ordinary Portland cement concrete. (2) the impermeability of alite-barium aluminate cement concrete is better than that of ordinary Portland cement concrete. The relative permeability coefficient of ordinary Portland cement concrete is 40 times of that of Dalit barium aluminate cement concrete. (3) the early strength of alite-barium aluminate cement concrete with fly ash decreases, but the later strength increases rapidly. Its growth rate is higher than that of the same kind of concrete without admixture, and the addition of admixture obviously improves the impermeability of concrete, and increases gradually with the increase of admixture. The frost resistance decreases with the increase of fly ash content. (4) through the XRD analysis, SEM-EDS analysis, pore structure analysis and other testing techniques, it is found that the cement in the concrete structure of alit-barium aluminate cement concrete, The interface of aggregate is better than that of ordinary cement concrete, the particle size distribution of hydration product is more uniform, and the clinker particle is basically encapsulated by hydrated silicic acid gel, which makes its structure more compact. With the addition of fly ash, the filling property of cement particles and the pore structure of gels are improved, the pore size is reduced, and the number of harmful pores is reduced, so that the impermeability of concrete is improved.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528;TQ172.1

【相似文献】