高炉渣纤维制备纤维增强混凝土掺合机理的研究

发布时间：2018-05-13 08:42

本文选题：高炉渣纤维 + 耐碱性能　；参考：《华北理工大学》2017年硕士论文

【摘要】：高炉渣纤维是一种新型棉花状无机纤维材料,是以高炉矿渣为主要原料,经重熔、调质、离心喷吹制备而来。高炉渣纤维具有质量轻、耐高温性能好等优点,被广泛应用于很多领域。但其作为水泥混凝土增强材料的相关性研究却很少。文章结合了其它纤维混凝土的性能和要求,研究了高炉渣纤维耐碱性能及其对水泥砂浆与混凝土材料性能的影响。其研究内容和结论如下:1)探索了高炉渣纤维的耐碱性能。研究表明:纤维的腐蚀程度随着碱液浓度、浸泡时间、温度的增加而加重,其耐碱性能较差。2)研究了高炉渣纤维对水泥砂浆性能的影响。添加高炉渣纤维可以增加砂浆试件的强度,改善材料的干缩性能。纤维掺量为0.60%时较为适宜,试件在养护28d后抗折强度增加了12.5%,抗压强度增加了7.66%;纤维质量分数为0.5%~1%时,纤维对水泥砂浆干缩性能的改善比较显著。3)研究了相同掺量时,纤维酸度系数及纤维种类对水泥砂浆力学性能的影响。试验结果显示:酸度系数越大,纤维内部的网络结构间相互作用力越强,纤维耐碱性能越强,其对水泥基复合材料性能的改善效果越好。酸度系数为1.4的高炉渣纤维对水泥砂浆的增强效果优于Mk=1.1、1.2、1.3的纤维。此外,高炉渣纤维对砂浆早期的增强效果要优于玄武岩纤维及聚丙烯纤维。后期,由于高炉渣纤维的耐碱性能较差,其增强效果要弱于另外两种纤维。4)研究了在混凝土基体中添加0.25%~2%的高炉渣纤维时,混凝土基体材料力学性能的变化情况。结果显示:在添加质量分数为2%的纤维、养护28d后,试件抗压强度增加7.27%,抗折强度增加17.42%,劈裂抗拉强度改善不明显。
[Abstract]:Blast furnace slag fiber is a new kind of cotton inorganic fiber material, which is prepared from blast furnace slag by remelting, tempering and centrifugal injection. Blast furnace slag fiber has been widely used in many fields because of its advantages of light weight and high temperature resistance. However, there is little research on its relevance as cement concrete reinforcement material. Combined with the properties and requirements of other fiber reinforced concrete, the alkali resistance of blast furnace slag fiber and its influence on the properties of cement mortar and concrete material are studied in this paper. The research contents and conclusions are as follows: 1) the alkali resistance of blast furnace slag fiber is explored. The results showed that the corrosion degree of the fiber increased with the increase of alkali concentration, soaking time and temperature, and the alkali-resistance of the fiber was poor. 2) the effect of slag fiber on the properties of cement mortar was studied. The addition of blast furnace slag fiber can increase the strength of mortar specimen and improve the dry shrinkage property of the material. When the fiber content is 0.60, the flexural strength and compressive strength of the specimens increased 12.5 and 7.66 respectively after 28 days of maintenance. When the fiber mass fraction was 0.5 ~ 1, the improvement of the dry shrinkage property of the cement mortar was significant when the fiber mass fraction was 0.5 ~ 1). Effects of fiber acidity coefficient and fiber type on mechanical properties of cement mortar. The experimental results show that the greater the acidity coefficient, the stronger the interaction between the network structure and the alkali resistance of the fibers, and the better the performance of the cement matrix composites is. The reinforcement effect of blast furnace slag fiber with acidity coefficient 1.4 is better than that of Mkn 1.1and 1.21.3.The reinforcement effect of slag fiber on cement mortar is better than that on cement mortar with acid coefficient of 1.4. In addition, blast furnace slag fiber is superior to basalt fiber and polypropylene fiber in strengthening mortar at early stage. In the later stage, because of the poor alkali resistance of blast furnace slag fiber, its reinforcing effect is weaker than that of other two kinds of fiber. The change of mechanical properties of concrete matrix material is studied when adding 0.25% slag fiber to concrete matrix. The results showed that the compressive strength and flexural strength of the specimens increased by 7.27, 17.42 and 17.42 respectively, and the splitting tensile strength was not improved obviously after 28 days of curing with the addition of 2% fiber.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528.572

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