公路混凝土增韧及其水化机理研究

发布时间：2018-10-09 21:22

【摘要】：本论文针对公路混凝土，围绕钢渣粉，研究了将钢渣粉和矿渣粉用于混凝土来增强公路混凝土的韧性。本文在对钢渣、矿渣原料的细度、化学组成、矿物组成、微观结构等基本指标进行测定基础上，从公路混凝土路面对材料韧性、耐磨性的性能的要求出发，，通过混凝土的基本组成材料的优化组合，合理选择水泥熟料、混合材、掺合料、配合比等，研究了钢渣粉单掺、矿渣粉单掺、复掺对水泥水化性能及水化产物微观结构、孔隙率的影响；研究钢渣粉、矿渣粉单掺、复掺对水泥及混凝土的物理性能、力学性能的影响，探寻提高混凝土韧性的优化组合方案。本论文研究了钢渣粉、矿渣粉的单掺、复掺对水泥胶砂强度的影响，研究表明：在本文条件下，钢渣粉和矿渣粉等量取代40%水泥熟料且两者的质量比为3：7时，钢渣粉和矿渣粉的复合掺加能够很好的提高水泥胶砂的强度，增强水泥胶砂的耐磨性。本文研究了钢渣粉、矿渣粉的单掺、复掺对水泥混凝土力学性能的影响，研究表明：钢渣粉和矿渣粉的双掺提高了水泥混凝土的抗压强度、抗弯拉强度和劈裂强度，在利用废料的同时增强了公路水泥混凝土所要求的物理力学指标，尤其是抗弯拉强度的增加。同时对双掺钢渣粉矿渣粉的水泥混凝土进行了弯曲韧性试验，并与钢纤维混凝土做了比较，研究表明：钢渣粉矿渣粉的双掺能够有效提高混凝土的韧性，虽然其增韧效果不如钢纤维，但与空白组相比效果显著。本文对钢渣粉、矿渣粉单掺或复掺的胶凝材料水化产物进行了微观结构研究。研究表明：钢渣粉矿渣粉的不同掺加均能够改善水化物的水化和孔径分布。其中，矿渣粉单掺的效果最为明显，它能够明显降低水化物中的微孔数量；钢渣粉矿渣粉的复掺也能够改善水化物的孔径分布，但效果没有单掺矿渣粉明显；当单掺钢渣粉时水化物孔径分布改变最为不明显。特别强调的是，虽然不同钢渣粉矿渣粉的掺入对水化物孔径分布改变有所差异，但总体来看都有所改善，而且钢渣粉矿渣粉的掺入都能有效降低水化物中的不良孔径（50nm）。
[Abstract]:In this paper, steel slag powder and slag powder are used to strengthen the toughness of highway concrete. On the basis of measuring the fineness, chemical composition, mineral composition and microstructure of steel slag and slag raw materials, this paper starts from the requirements of material toughness and wear resistance of highway concrete pavement. Through the optimization and combination of the basic components of concrete and the reasonable selection of cement clinker, mixture, admixture and mix ratio, the hydration properties and microstructure of hydration products of steel slag powder, slag powder and slag powder were studied. The influence of steel slag powder and slag powder on the physical and mechanical properties of cement and concrete was studied. In this paper, the influence of steel slag powder and slag powder on the strength of cement mortar is studied. The results show that the steel slag powder and slag powder replace 40% cement clinker in equal quantity under the condition of this paper, and the mass ratio of the two is 3:7. The addition of steel slag powder and slag powder can improve the strength of cement sand and enhance the wear resistance of cement sand. In this paper, the influence of steel slag powder and slag powder on the mechanical properties of cement concrete is studied. The results show that the compressive strength, flexural tensile strength and splitting strength of cement concrete are improved by the addition of steel slag powder and slag powder. At the same time, the physical and mechanical indexes of highway cement concrete are strengthened, especially the flexural tensile strength. At the same time, the flexural toughness test of cement concrete mixed with steel slag powder is carried out and compared with steel fiber concrete. The results show that the double mixing of steel slag powder can effectively improve the toughness of concrete. Although its toughening effect is not as good as steel fiber, it is more effective than blank group. The microstructures of hydration products of steel slag powder and slag powder were studied. The results show that the hydration and pore size distribution of hydrates can be improved by different addition of slag powder. Among them, the effect of single addition of slag powder is the most obvious, it can obviously reduce the number of micropores in hydrates, the co-mixing of slag powder of steel slag powder can also improve the pore size distribution of hydrates, but the effect is not as obvious as that of slag powder alone. When steel slag powder is added, the pore size distribution of hydrates is the least obvious. It is especially emphasized that although the addition of different steel slag powder has different influence on the pore size distribution of hydrates, it has been improved in general, and the addition of steel slag powder can effectively reduce the bad pore size (50nm) in hydrates.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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