钢渣—粉煤灰复合胶凝材料制备技术及其应用
发布时间：2018-12-26 07:14
【摘要】：能源和资源问题是当今的热点问题,建筑节能更是我国可持续发展中亟待解决的问题。水泥的生产过程,不仅消耗大量的矿物资源和能源,并且排放大量的C0：和其他有害气体,造成严重的环境污染和资源的浪费。碱激发胶凝材料不仅能够降低能源、资源消耗,而且有效利用工业废渣,减少环境污染和碳的排放。随着研究的深入,其原料则几乎不用熟料而全部利用工业废渣,且原料品种逐渐由矿渣和烧粘土不断扩展到钢渣、粉煤灰、磷渣、赤泥、尾矿等铝硅酸盐类工业废渣。研究胶凝材料制备的新原理,加强工业废渣的利用研究,是一项既具有科学价值,又具有实际意义的工作。粒化高炉矿渣和粉煤灰是性能比较好的矿物掺合料,而且经过几十年的科学研究和工程实践,这两种矿物掺合料在混凝土中的应用技术已比较成熟。而钢渣活性低、稳定性差,其利用率远低于矿渣、粉煤灰,大多用作回填料。利用钢渣价格低廉的优势,将钢渣、粉煤灰复合制备胶凝材料,发挥两者水化相互叠加、促进的优势,为碱激发胶凝材料的发展和应用提供理论基础。本文以活性相对较差的钢渣、粉煤灰作为胶凝材料,用氢氧化钠调整硅酸钠溶液的模数(调整至1.2)作为碱激发剂,制备胶砂、砂浆、混凝土试件。通过胶砂流动性、砂浆稠度等试验测定其工作性能,确定水灰比并进行配合比设计。通过立方体抗压、抗折等强度试验测定其基本力学性能。作为胶凝材料代替水泥,应用于抗裂抹面砂浆的制备。主要研究结果具体如下：(1)胶砂流动度试验表明,达到相同流动度值,钢渣-粉煤灰胶砂比水泥(RC32.5R)胶砂用水少,最优水胶比约为0.47。28d抗压强度为23.3MPa,抗折强度4.2MPa。钢渣水化速率慢,早期强度低,7d强度约为28d强度的25%。同时,养护条件对强度有影响,自然养护条件下的强度高于养护箱养护。(2)对钢渣的密度、比表面积等性能进行测定,研究钢渣细度对钢渣活性的影响,将青岛钢厂排放的钢渣经过筛选、球磨,与日照钢渣厂生产的Ⅱ级钢渣粉作对比。砂浆7d立方体抗压强度18.8MPa,28d强度41.2MPa,28d抗折强度为5.6MP。钢渣比表面积对强度有一定影响,随着比表面积增加,28d强度提高明显。(3)钢渣、粉煤灰作为胶凝材料,替代水泥,制备混凝土。混凝土7d立方体抗压强度13.7MPa,28d强度为22.5MPa,7d与28d的强度比为0.61,28d劈裂抗拉强度为1.6MPa。通过其基本力学性能指标,为制作混凝土构件提供理论依据。(4)钢渣和粉煤灰作为胶凝材料,替代水泥应用干制备抗裂抹面砂浆,研究胶砂比、用水量、聚羧酸减水剂、以及聚丙烯纤维和可再分散性乳胶粉的掺加对砂浆稠度等工作性能的影响：结果表明,最优胶砂比1：1.5,水胶比0.46,掺入聚丙烯纤维、可再分散性乳胶粉(VAE)能够降低压折比,对砂浆抗裂性、柔韧性有一定提高：在经济成本方面,钢渣-粉煤灰抗裂抹面砂浆比水泥抗裂砂浆降低11.7%。
[Abstract]:Energy and resources are hot issues nowadays, and building energy conservation is an urgent problem in sustainable development of our country. Cement production process not only consumes a lot of mineral resources and energy, but also emits a lot of C0: and other harmful gases, resulting in serious environmental pollution and waste of resources. Alkali-activated cementitious materials can not only reduce energy and resource consumption, but also effectively utilize industrial waste residue to reduce environmental pollution and carbon emissions. With the development of research, the raw materials almost use industrial waste slag without clinker, and the variety of raw material is gradually extended from slag and clay to aluminosilicate industrial waste slag, such as steel slag, fly ash, phosphorus slag, red mud, tailings and so on. It is of scientific value and practical significance to study the new principle of preparation of cementitious materials and to strengthen the utilization of industrial waste residue. Granulated blast furnace slag and fly ash are mineral admixtures with good properties. After decades of scientific research and engineering practice, the application technology of these two mineral admixtures in concrete has been relatively mature. Steel slag has low activity and poor stability, and its utilization ratio is much lower than that of slag and fly ash, which is mostly used as backfill. Based on the advantage of low price of steel slag, the cementing material is prepared by combining steel slag and fly ash to give play to the advantages of superposition and promotion of hydration between the two materials, which provides a theoretical basis for the development and application of alkali-activated cementitious materials. In this paper, steel slag with relatively poor activity, fly ash as cementitious material, sodium hydroxide adjusted the modulus of sodium silicate solution (adjusted to 1.2) as alkali activator to prepare mortar, mortar and concrete specimen. The performance of cement mortar was determined by testing the fluidity and consistency of mortar, and the water-cement ratio was determined and the mix ratio was designed. The basic mechanical properties of the cube were measured by compressive and flexural strength tests. As a cementing material instead of cement, it is used in the preparation of anti-crack surface mortar. The main results are as follows: (1) the flowability test of cement sand shows that the steel slag / fly ash cement sand has less water than cement (RC32.5R) cement sand, and the optimum water-binder ratio is about 0.47.28 days compressive strength is 23.3MPa. Flexural strength 4.2 MPA. The hydration rate of steel slag is slow, the early strength is low, and the 7 d strength is about 25% of 28 d strength. At the same time, the curing condition has influence on the strength, and the strength under natural curing condition is higher than that of curing box. (2) the density, specific surface area and other properties of steel slag are measured, and the influence of steel slag fineness on slag activity is studied. The steel slag discharged from Qingdao Steel Plant was screened, milled and compared with the grade 鈪，
本文编号：2391718
[Abstract]:Energy and resources are hot issues nowadays, and building energy conservation is an urgent problem in sustainable development of our country. Cement production process not only consumes a lot of mineral resources and energy, but also emits a lot of C0: and other harmful gases, resulting in serious environmental pollution and waste of resources. Alkali-activated cementitious materials can not only reduce energy and resource consumption, but also effectively utilize industrial waste residue to reduce environmental pollution and carbon emissions. With the development of research, the raw materials almost use industrial waste slag without clinker, and the variety of raw material is gradually extended from slag and clay to aluminosilicate industrial waste slag, such as steel slag, fly ash, phosphorus slag, red mud, tailings and so on. It is of scientific value and practical significance to study the new principle of preparation of cementitious materials and to strengthen the utilization of industrial waste residue. Granulated blast furnace slag and fly ash are mineral admixtures with good properties. After decades of scientific research and engineering practice, the application technology of these two mineral admixtures in concrete has been relatively mature. Steel slag has low activity and poor stability, and its utilization ratio is much lower than that of slag and fly ash, which is mostly used as backfill. Based on the advantage of low price of steel slag, the cementing material is prepared by combining steel slag and fly ash to give play to the advantages of superposition and promotion of hydration between the two materials, which provides a theoretical basis for the development and application of alkali-activated cementitious materials. In this paper, steel slag with relatively poor activity, fly ash as cementitious material, sodium hydroxide adjusted the modulus of sodium silicate solution (adjusted to 1.2) as alkali activator to prepare mortar, mortar and concrete specimen. The performance of cement mortar was determined by testing the fluidity and consistency of mortar, and the water-cement ratio was determined and the mix ratio was designed. The basic mechanical properties of the cube were measured by compressive and flexural strength tests. As a cementing material instead of cement, it is used in the preparation of anti-crack surface mortar. The main results are as follows: (1) the flowability test of cement sand shows that the steel slag / fly ash cement sand has less water than cement (RC32.5R) cement sand, and the optimum water-binder ratio is about 0.47.28 days compressive strength is 23.3MPa. Flexural strength 4.2 MPA. The hydration rate of steel slag is slow, the early strength is low, and the 7 d strength is about 25% of 28 d strength. At the same time, the curing condition has influence on the strength, and the strength under natural curing condition is higher than that of curing box. (2) the density, specific surface area and other properties of steel slag are measured, and the influence of steel slag fineness on slag activity is studied. The steel slag discharged from Qingdao Steel Plant was screened, milled and compared with the grade 鈪，
本文编号：2391718
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