鈦礦渣—固硫灰輔助性膠凝材料的性能研究
發(fā)布時(shí)間：2018-07-27 15:29
【摘要】：隨著成渝經(jīng)濟(jì)區(qū)一體化的規(guī)劃發(fā)展,兩地大力推進(jìn)各種基礎(chǔ)設(shè)施建設(shè),對(duì)于水泥和混凝土等建筑材料的需求量增長(zhǎng)較大,但四川地區(qū)優(yōu)質(zhì)的水泥與混凝土用的優(yōu)質(zhì)輔助性膠凝材料比較缺乏,處于一種供不應(yīng)求的局面。另一方面,四川地區(qū)擁有大量排放、堆棄而未得到有效利用的工業(yè)固體廢棄物鈦礦渣、固硫灰,其不僅占用了大量的耕地,并且造成當(dāng)?shù)厣鷳B(tài)環(huán)境的破壞,也成為了相應(yīng)行業(yè)可持續(xù)發(fā)展的“瓶頸”。因此,本文擬應(yīng)用鈦礦渣、固硫灰作為水泥和混凝土的輔助性膠凝材料,一方面來(lái)緩解環(huán)境壓力,彌補(bǔ)輔助性膠凝材料市場(chǎng)缺口;另一方面打破企業(yè)可持續(xù)發(fā)展的“瓶頸”。通過(guò)對(duì)鈦礦渣、固硫灰兩種工業(yè)廢渣的基本物理化學(xué)特性研究,發(fā)現(xiàn)固硫灰中活性礦物含量高,且自身含有少量起激發(fā)作用的游離氧化鈣和硫酸鹽,但其需水量高,且摻量過(guò)高可能引起建材制品安定性不良;鈦礦渣表面光滑密實(shí),具有較好的減水作用,并且含有少量的可被激發(fā)的活性礦物,但其總體活性較低。由此可見(jiàn),這兩者的特性恰好呈現(xiàn)出互補(bǔ)狀態(tài),有可能產(chǎn)生協(xié)同改性效應(yīng)。因此本文提出采用鈦礦渣和固硫灰復(fù)合的方法,制備鈦礦渣-固硫灰輔助性膠凝材料,并將其應(yīng)用于水泥和混凝土中。為此,本文研究了鈦礦渣與固硫灰單摻及不同比例復(fù)合時(shí),對(duì)水泥和混凝土的宏觀及微觀性能的影響,并與粉煤灰和S75級(jí)礦渣粉做了對(duì)比。結(jié)果表明:鈦礦渣與固硫灰復(fù)合時(shí),兩者的性能能夠優(yōu)勢(shì)互補(bǔ),且在質(zhì)量比為2:1時(shí)組成的鈦礦渣-固硫灰輔助性膠凝材料的工作性能和力學(xué)性能處于較佳的水平,其活性與二級(jí)粉煤灰的基本相同。鈦礦渣-固硫灰輔助性膠凝材料作為水泥混合材,在代替30%的熟料時(shí),能夠制備出滿足國(guó)家標(biāo)準(zhǔn)的P.C 42.5R水泥,代替50%的熟料能夠制備出P.C 32.5R水泥。通過(guò)微觀分析,可以發(fā)現(xiàn)鈦礦渣能夠提高水化凝膠結(jié)構(gòu)的致密性;固硫灰可以促進(jìn)鈦礦渣后期的火山灰反應(yīng);使得摻入鈦礦渣-固硫灰輔助性膠凝材料的混凝土的工作性和抗壓強(qiáng)度與S75級(jí)礦渣粉相近。復(fù)合體系能夠改善單獨(dú)摻入固硫灰而導(dǎo)致混凝土抗凍融和抗碳化能力差的問(wèn)題。偏高嶺土摻入到復(fù)合體系中組成的鈦礦渣-固硫灰-偏高嶺土輔助性膠凝材料,能夠增加水泥體系的水化產(chǎn)物,提高膠砂活性指數(shù),且后期強(qiáng)度有較大幅度增加;作為礦物摻合料代替30%水泥時(shí),混凝土60d的抗壓強(qiáng)度高于純水泥對(duì)照組。
[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.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ177
本文編號(hào)：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.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ177
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