【作者】 孙金坤；

【导师】 李英民；

【作者基本信息】 重庆大学 ， 结构工程， 2006， 硕士

【摘要】 以往利用攀钢高钛重矿渣作粗骨料或磨细掺合料配制混凝土(称“高钛重矿渣混凝土”),经实践证明是可行的。但将其作粗、细骨料及磨细掺合料一并使用配制混凝土(称“全高钛重矿渣混凝土”),尚缺乏进一步的研究,对于该种混凝土构件乃至结构,还没有试验验证。为此,本文结合所参与的攀枝花市科技局立项课题《高钛重矿渣混凝土及墙体材料的研究》,从材料和构件两个层次对该种混凝土进行应用基础研究。在材料层次研究方面,本文首先验证分析了高钛重矿渣的结构稳定性和物理力学性能。通过试配C10-C55的普通型全高钛重矿渣混凝土,与同设计条件下的普通混凝土、河砂与重矿渣碎石配制的混凝土进行对比试验。结果表明:全高钛重矿渣混凝土的抗压强度、轴心抗压强度、劈裂强度较后两种混凝土高。在全高钛重矿渣混凝土中复合微粉取代水泥掺量以15%～20%为宜。其次,分析论证了全高钛重矿渣作粗、细骨料能够满足道路用JT-2003的技术标准。以道路型全高钛重矿渣混凝土抗弯拉强度为中心,通过正交配合比试验,得出最优配合比,分析了各因素对该种混凝土力学性能的影响。在构件层次研究方面,首先进行了全高钛重矿渣钢筋混凝土梁正截面抗弯性能试验研究。以混凝土强度和纵筋率为变量参数,与同设计条件的普通钢筋混凝土梁进行对比。内容集中在强度、刚度和破坏形态等宏观力学性能上。结果表明:相近条件下,全高钛重矿渣钢筋混凝土梁在承载能力、刚度、裂缝等方面均优于普通钢筋混凝土梁;符合平截面假定,呈典型的正截面破坏;试验实测抗弯承载力值比按规范计算值高。其次,进行了全高钛重矿渣混凝土与钢筋的粘结强度性能试验研究。以钢筋直径、混凝土强度为主要影响因素,采用直接拔出试验,与普通钢筋混凝土进行对比分析。结果表明:相同条件下全高钛重矿渣混凝土与钢筋的极限粘结强度比普通混凝土高出约30%;锚固钢筋直径越大,粘结强度越低。相同的粘结力作用下,全高钛重矿渣混凝土中钢筋滑移量明显小于普通混凝土。全高钛重矿渣混凝土中钢筋开始发生自由端滑移的荷载值普遍高于普通混凝土。本文最后对全高钛重矿渣混凝土各项耐久性指标进行了试验与分析,并对以前的工程实例进行了混凝土钻芯取样试验。结果表明:高钛重矿渣混凝土各项耐久性指标满足相应标准,钻芯混凝土抗压强度均高于原设计强度。更多还原

【Abstract】 In the past, high titanium heavy slag of Panzhihua steel was used as the coarse aggregate or ground fine addition to make concrete, which is called“high titanium heavy slag concrete (HTHSC)”, and practice shows that this is feasible. However, further study is needed for making concrete which is called“complex high titanium heavy slag concrete (CHTHSC)”, using high titanium heavy slag as the coarse aggregate, fine aggregate and ground fine addition in it. So far, there has been no test confirming the components and structure of concrete of this kind. Therefore, this paper, combining with the theme of the project established by Panzhihua Science and Technology Bureau–“Study on High Titanium Heavy Slag Concrete and Wall Material”, in which the author participates, conducts application study on this kind of concrete from the level of material and the level of component.In the aspect of the study on the level of material, this paper first testifies and analyzes the stability of the structure and the physical mechanics performance of high titanium heavy slag. C10-C55 CHTHSC are made and experiments are conducted to compare them with common concrete and concrete composed of fluvial sand, heavy slag and macadam. Results show that the compression resistance, axial compression resistance and cleavage strength of CHTHSC are higher than those of the other two kinds of concrete. For CHTHSC, it is appropriate to have 15%-20% of compound powder take the place of cement content.More over, the paper analyzes and demonstrates that complex high titanium heavy slag used as the coarse aggregate and fine aggregate can meet the road-use JT-2003 technical standards. With the anti-flexural-tensile strength of road-type CHTHSC as the center, through orthogonal experiment of mix proportion, the most optimized mix proportion was obtained. Also, the influence of all kinds of factors on the mechanics performance of this kind of concrete is analyzed.As for the study on the level of component, experimental study on the anti-bending performance of the normal section of complex high titanium heavy slag reinforced concrete beam is firstly conducted. With concrete strength and longitudinal reinforcement ratio as the variable parameters, it is compared with common reinforced concrete beams with the same designed conditions. The content is focused on macro mechanics performances such as the strength, rigidity and destroying form. Results更多还原