钛矿渣—固硫灰辅助性胶凝材料的性能研究
发布时间：2018-07-27 15:29
【摘要】：随着成渝经济区一体化的规划发展,两地大力推进各种基础设施建设,对于水泥和混凝土等建筑材料的需求量增长较大,但四川地区优质的水泥与混凝土用的优质辅助性胶凝材料比较缺乏,处于一种供不应求的局面。另一方面,四川地区拥有大量排放、堆弃而未得到有效利用的工业固体废弃物钛矿渣、固硫灰,其不仅占用了大量的耕地,并且造成当地生态环境的破坏,也成为了相应行业可持续发展的“瓶颈”。因此,本文拟应用钛矿渣、固硫灰作为水泥和混凝土的辅助性胶凝材料,一方面来缓解环境压力,弥补辅助性胶凝材料市场缺口;另一方面打破企业可持续发展的“瓶颈”。通过对钛矿渣、固硫灰两种工业废渣的基本物理化学特性研究,发现固硫灰中活性矿物含量高,且自身含有少量起激发作用的游离氧化钙和硫酸盐,但其需水量高,且掺量过高可能引起建材制品安定性不良;钛矿渣表面光滑密实,具有较好的减水作用,并且含有少量的可被激发的活性矿物,但其总体活性较低。由此可见,这两者的特性恰好呈现出互补状态,有可能产生协同改性效应。因此本文提出采用钛矿渣和固硫灰复合的方法,制备钛矿渣-固硫灰辅助性胶凝材料,并将其应用于水泥和混凝土中。为此,本文研究了钛矿渣与固硫灰单掺及不同比例复合时,对水泥和混凝土的宏观及微观性能的影响,并与粉煤灰和S75级矿渣粉做了对比。结果表明:钛矿渣与固硫灰复合时,两者的性能能够优势互补,且在质量比为2:1时组成的钛矿渣-固硫灰辅助性胶凝材料的工作性能和力学性能处于较佳的水平,其活性与二级粉煤灰的基本相同。钛矿渣-固硫灰辅助性胶凝材料作为水泥混合材,在代替30%的熟料时,能够制备出满足国家标准的P.C 42.5R水泥,代替50%的熟料能够制备出P.C 32.5R水泥。通过微观分析,可以发现钛矿渣能够提高水化凝胶结构的致密性;固硫灰可以促进钛矿渣后期的火山灰反应;使得掺入钛矿渣-固硫灰辅助性胶凝材料的混凝土的工作性和抗压强度与S75级矿渣粉相近。复合体系能够改善单独掺入固硫灰而导致混凝土抗冻融和抗碳化能力差的问题。偏高岭土掺入到复合体系中组成的钛矿渣-固硫灰-偏高岭土辅助性胶凝材料,能够增加水泥体系的水化产物,提高胶砂活性指数,且后期强度有较大幅度增加;作为矿物掺合料代替30%水泥时,混凝土60d的抗压强度高于纯水泥对照组。
[Abstract]:With the planning and development of the integration of Chengdu-Chongqing Economic Zone, the two places have vigorously promoted the construction of various infrastructure facilities, and the demand for building materials such as cement and concrete has increased greatly. But high quality cement and high quality auxiliary cementing materials used in concrete in Sichuan area are in short supply. On the other hand, Sichuan has a large amount of industrial solid waste titanium slag, sulfur fixation ash, which is discharged, dumped but not effectively utilized, which not only occupies a large amount of cultivated land, but also causes damage to the local ecological environment. Has also become the corresponding industry sustainable development "bottleneck". Therefore, this paper intends to use titanium slag and sulfur fixing ash as auxiliary cementing materials for cement and concrete, on the one hand, to relieve environmental pressure and make up for the gap in the market of auxiliary cementing materials; on the other hand, to break the "bottleneck" of sustainable development of enterprises. The basic physical and chemical properties of titanium slag and sulfur fixing ash industrial waste slag were studied. It was found that the active minerals in the sulfur fixation ash contained a small amount of free calcium oxide and sulfate, but the water demand was high. Too high content of titanium slag may lead to poor stability of building materials, smooth and dense surface of titanium slag, good water-reducing effect, and a small amount of activated minerals, but its overall activity is low. It can be seen that the characteristics of these two exactly show complementary state, which may produce synergistic modification effect. In this paper, titanium slag and sulfur fixing ash are used to prepare the auxiliary cementing material of titanium slag and sulfur fixing ash, and it is applied to cement and concrete. In this paper, the effects of titanium slag and sulfur fixation fly ash on the macroscopic and microscopic properties of cement and concrete were studied, and the results were compared with those of fly ash and S75 grade slag powder. The results show that the properties of titanium slag and sulfur fixation fly ash are complementary, and the performance and mechanical properties of the auxiliary cementing material composed of titanium slag and sulfur fixing ash are at a better level when the mass ratio is 2:1. Its activity is basically the same as that of secondary fly ash. As a cement mixture of titanium slag and sulfur fixing ash, when 30% clinker is replaced, P.C42.5R cement which meets the national standard can be prepared, and P.C32.5R cement can be prepared instead of 50% clinker. Through microscopic analysis, it can be found that titanium slag can improve the density of hydrated gel structure, and sulfur fixation ash can promote the volcanic ash reaction in the later stage of titanium slag. The workability and compressive strength of the concrete mixed with titanium slag and sulfur fixing ash auxiliary cementing material are close to that of S75 grade slag powder. The composite system can improve the problem that the concrete has poor anti-freezing and anti-carbonation ability due to the addition of sulfur-fixing ash alone. The addition of metakaolin into the composite system can increase the hydration product of cement system, increase the activity index of cement sand, and increase the strength of the cement system in the later stage, which is composed of titanium slag, sulfur fixing ash and metakaolin auxiliary cementing material. When used as mineral admixture instead of 30% cement, the compressive strength of concrete for 60 days is higher than that of pure cement control group.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177
本文编号：2148274
[Abstract]:With the planning and development of the integration of Chengdu-Chongqing Economic Zone, the two places have vigorously promoted the construction of various infrastructure facilities, and the demand for building materials such as cement and concrete has increased greatly. But high quality cement and high quality auxiliary cementing materials used in concrete in Sichuan area are in short supply. On the other hand, Sichuan has a large amount of industrial solid waste titanium slag, sulfur fixation ash, which is discharged, dumped but not effectively utilized, which not only occupies a large amount of cultivated land, but also causes damage to the local ecological environment. Has also become the corresponding industry sustainable development "bottleneck". Therefore, this paper intends to use titanium slag and sulfur fixing ash as auxiliary cementing materials for cement and concrete, on the one hand, to relieve environmental pressure and make up for the gap in the market of auxiliary cementing materials; on the other hand, to break the "bottleneck" of sustainable development of enterprises. The basic physical and chemical properties of titanium slag and sulfur fixing ash industrial waste slag were studied. It was found that the active minerals in the sulfur fixation ash contained a small amount of free calcium oxide and sulfate, but the water demand was high. Too high content of titanium slag may lead to poor stability of building materials, smooth and dense surface of titanium slag, good water-reducing effect, and a small amount of activated minerals, but its overall activity is low. It can be seen that the characteristics of these two exactly show complementary state, which may produce synergistic modification effect. In this paper, titanium slag and sulfur fixing ash are used to prepare the auxiliary cementing material of titanium slag and sulfur fixing ash, and it is applied to cement and concrete. In this paper, the effects of titanium slag and sulfur fixation fly ash on the macroscopic and microscopic properties of cement and concrete were studied, and the results were compared with those of fly ash and S75 grade slag powder. The results show that the properties of titanium slag and sulfur fixation fly ash are complementary, and the performance and mechanical properties of the auxiliary cementing material composed of titanium slag and sulfur fixing ash are at a better level when the mass ratio is 2:1. Its activity is basically the same as that of secondary fly ash. As a cement mixture of titanium slag and sulfur fixing ash, when 30% clinker is replaced, P.C42.5R cement which meets the national standard can be prepared, and P.C32.5R cement can be prepared instead of 50% clinker. Through microscopic analysis, it can be found that titanium slag can improve the density of hydrated gel structure, and sulfur fixation ash can promote the volcanic ash reaction in the later stage of titanium slag. The workability and compressive strength of the concrete mixed with titanium slag and sulfur fixing ash auxiliary cementing material are close to that of S75 grade slag powder. The composite system can improve the problem that the concrete has poor anti-freezing and anti-carbonation ability due to the addition of sulfur-fixing ash alone. The addition of metakaolin into the composite system can increase the hydration product of cement system, increase the activity index of cement sand, and increase the strength of the cement system in the later stage, which is composed of titanium slag, sulfur fixing ash and metakaolin auxiliary cementing material. When used as mineral admixture instead of 30% cement, the compressive strength of concrete for 60 days is higher than that of pure cement control group.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177
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