鋼渣—粉煤灰復合膠凝材料制備技術(shù)及其應(yīng)用
發(fā)布時間：2018-12-26 07:14
【摘要】：能源和資源問題是當今的熱點問題,建筑節(jié)能更是我國可持續(xù)發(fā)展中亟待解決的問題。水泥的生產(chǎn)過程,不僅消耗大量的礦物資源和能源,并且排放大量的C0：和其他有害氣體,造成嚴重的環(huán)境污染和資源的浪費。堿激發(fā)膠凝材料不僅能夠降低能源、資源消耗,而且有效利用工業(yè)廢渣,減少環(huán)境污染和碳的排放。隨著研究的深入,其原料則幾乎不用熟料而全部利用工業(yè)廢渣,且原料品種逐漸由礦渣和燒粘土不斷擴展到鋼渣、粉煤灰、磷渣、赤泥、尾礦等鋁硅酸鹽類工業(yè)廢渣。研究膠凝材料制備的新原理,加強工業(yè)廢渣的利用研究,是一項既具有科學價值,又具有實際意義的工作。�；郀t礦渣和粉煤灰是性能比較好的礦物摻合料,而且經(jīng)過幾十年的科學研究和工程實踐,這兩種礦物摻合料在混凝土中的應(yīng)用技術(shù)已比較成熟。而鋼渣活性低、穩(wěn)定性差,其利用率遠低于礦渣、粉煤灰,大多用作回填料。利用鋼渣價格低廉的優(yōu)勢,將鋼渣、粉煤灰復合制備膠凝材料,發(fā)揮兩者水化相互疊加、促進的優(yōu)勢,為堿激發(fā)膠凝材料的發(fā)展和應(yīng)用提供理論基礎(chǔ)。本文以活性相對較差的鋼渣、粉煤灰作為膠凝材料,用氫氧化鈉調(diào)整硅酸鈉溶液的模數(shù)(調(diào)整至1.2)作為堿激發(fā)劑,制備膠砂、砂漿、混凝土試件。通過膠砂流動性、砂漿稠度等試驗測定其工作性能,確定水灰比并進行配合比設(shè)計。通過立方體抗壓、抗折等強度試驗測定其基本力學性能。作為膠凝材料代替水泥,應(yīng)用于抗裂抹面砂漿的制備。主要研究結(jié)果具體如下：(1)膠砂流動度試驗表明,達到相同流動度值,鋼渣-粉煤灰膠砂比水泥(RC32.5R)膠砂用水少,最優(yōu)水膠比約為0.47。28d抗壓強度為23.3MPa,抗折強度4.2MPa。鋼渣水化速率慢,早期強度低,7d強度約為28d強度的25%。同時,養(yǎng)護條件對強度有影響,自然養(yǎng)護條件下的強度高于養(yǎng)護箱養(yǎng)護。(2)對鋼渣的密度、比表面積等性能進行測定,研究鋼渣細度對鋼渣活性的影響,將青島鋼廠排放的鋼渣經(jīng)過篩選、球磨,與日照鋼渣廠生產(chǎn)的Ⅱ級鋼渣粉作對比。砂漿7d立方體抗壓強度18.8MPa,28d強度41.2MPa,28d抗折強度為5.6MP。鋼渣比表面積對強度有一定影響,隨著比表面積增加,28d強度提高明顯。(3)鋼渣、粉煤灰作為膠凝材料,替代水泥,制備混凝土�；炷�7d立方體抗壓強度13.7MPa,28d強度為22.5MPa,7d與28d的強度比為0.61,28d劈裂抗拉強度為1.6MPa。通過其基本力學性能指標,為制作混凝土構(gòu)件提供理論依據(jù)。(4)鋼渣和粉煤灰作為膠凝材料,替代水泥應(yīng)用干制備抗裂抹面砂漿,研究膠砂比、用水量、聚羧酸減水劑、以及聚丙烯纖維和可再分散性乳膠粉的摻加對砂漿稠度等工作性能的影響：結(jié)果表明,最優(yōu)膠砂比1：1.5,水膠比0.46,摻入聚丙烯纖維、可再分散性乳膠粉(VAE)能夠降低壓折比,對砂漿抗裂性、柔韌性有一定提高：在經(jīng)濟成本方面,鋼渣-粉煤灰抗裂抹面砂漿比水泥抗裂砂漿降低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，
本文編號：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，
本文編號：2391718
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