【作者】 刘建忠；

【导师】 丛钢； 钱觉时；

【作者基本信息】 重庆大学 ， 材料学， 2001， 硕士

【摘要】 活性粉末混凝土是一种超高强、低脆性、耐久性优异并具有广阔应用前景的新型水泥基材料。由于活性粉末混凝土的配制成本太高，限制了其应用的推广。本文作者针对我国的原材料情况，在国内外的研究成果的基础上，立足于降低活性粉末混凝土的配制成本和提高钢渣的利用水平，使用风淬钢渣代替石英砂作集料来配制活性粉末混凝土进行了试验研究。 本文首先讲述了风淬钢渣的性质及其体积稳定性，指出风淬钢渣具有良好的物理和化学性能，适合于作集料来配制混凝土；同时从理论上分析并通过试验验证表明，由于风淬钢渣中游离CaO含量很低，而MgO主要以RO相形式存在，不存在体积安定性不良的问题。 其次，作者主要对钢渣活性粉末混凝土配制及其性能进行了试验研究，结果表明：（1）胶砂比为1:1，硅灰掺量为15％，钢纤维掺量为4％时所配制的活性粉末混凝土的综合性能比较理想。（2）钢渣的物理性能对钢渣活性粉末混凝土的性能影响较大，非球状钢渣有利于强度的提高，球状钢渣有利于提高流动性，而化学性能的影响不大。（3）水胶比是影响其性能最为关键因素之一，随着水胶比的降低，流动性下降和强度的提高都很明显；掺入4％的钢纤维对流动性的影响比较明显，同时也不同程度地提高了强度；热养护有利于强度的提高，经热水养护后放置水中至28天龄期，其强度有较大提升，并没有出现强度倒缩现象。（4）水胶比为0.18时所配制的钢渣活性粉末混凝土，28天抗折和抗压强度分别达21.61MPa和141.2MPa，弹性模量为51.1GPa，56天所测的干缩为430×10^-6，其中自收缩达400×10^-6，具有优越的抗渗性能和耐磨性能，但脆性较大：而掺入4％的钢纤维，不仅提高了强度和弹性模量，还减少了干缩和自收缩，也大大改善了脆性。 最后，作者探讨了钢渣活性粉末混凝土在工程和生产制品中的应用，指出钢渣活性粉末混凝土是有非常广阔应用前景的新型的超高强水泥其复合材料。更多还原

【Abstract】 With ultra-high strength, low brittleness and excellent durability, reactive powder concrete is an emerging new family of concretes. But too high unit cost Limits the extensive applications of reactive powder concrete. In order to decrease the unit cost of reactive powder concrete and increase the utilization of steel slag, the author, considering the raw materials in our contry and basing on the domestic and international research results, studies on preparation of reactive powder concrete using air quench steel slag replacing the quartz sand as aggregate through experiment.The characters and the stability of volume of air quench steel slag have been summarized first in this paper. The air quench steel slag has good physical and chemistrial properties, and can be used to prepare concretes as aggregate. At the same time, theoretical analyzation and experiment results also show that f-CaO content is very low, and MgO exists in the RO phase, so the volume of air quench steel slag is stabile.Secondly, preparation of reactive powder concrete with air quench steel slag and its performance are mainly studied through experiment. The results show that: (1) when binder-to-sand ratio is 1, silica fume percentage of binder is 15, and steel fiber percentage in volume is 4, reactive powder concrete prepared can get best overall performances. (2) the physical properties of steel slag, such as size and grain distribution, make a great impact on the performance of reactive powder concrete with steel slag. But the chemical properties have no remarkable influence on it (3) as the water-to-binder reduces wich is one of key factors in the perpormance of reactive powder concrete with steel slag, the fluidity decreases but the strength increases; incorporation of 4 percent steel fiber in volume can decrease fluility and increase strength; heat-curing benefits the increase of strength which can still develop in 28 day water curing after heat-curing. (4) the reactive powder concrete with steel slag which is prepared in water-to-binder ratio of 0.18 can get the flexural strength of 21.6 MPa, the compressive strength of 141 MPa, and elastic modulus of 51.1 GPa. Its dry shrinkage in 56 day reach 430X10"6, in which autogenous shrinkage is 400xlO~6. And it has excellent impermeability, but fatal brittleness. Incorporation of 4 percent steel fiber in volume can not only increase strength and elastic modulus, and also reduce dry shrinkage and autogenous shrinkage and enhance greatly ductility.Finally, the author briefly discusses the application of reactive powder concrete with steel slag in engineering and produce, and points out that it is also a new emerging family ultra-high cement-based material.更多还原