本文選題：高爐渣纖維 + 耐堿性能�。� 參考：《華北理工大學》2017年碩士論文

【摘要】：高爐渣纖維是一種新型棉花狀無機纖維材料,是以高爐礦渣為主要原料,經(jīng)重熔、調(diào)質、離心噴吹制備而來。高爐渣纖維具有質量輕、耐高溫性能好等優(yōu)點,被廣泛應用于很多領域。但其作為水泥混凝土增強材料的相關性研究卻很少。文章結合了其它纖維混凝土的性能和要求,研究了高爐渣纖維耐堿性能及其對水泥砂漿與混凝土材料性能的影響。其研究內(nèi)容和結論如下:1)探索了高爐渣纖維的耐堿性能。研究表明:纖維的腐蝕程度隨著堿液濃度、浸泡時間、溫度的增加而加重,其耐堿性能較差。2)研究了高爐渣纖維對水泥砂漿性能的影響。添加高爐渣纖維可以增加砂漿試件的強度,改善材料的干縮性能。纖維摻量為0.60%時較為適宜,試件在養(yǎng)護28d后抗折強度增加了12.5%,抗壓強度增加了7.66%;纖維質量分數(shù)為0.5%~1%時,纖維對水泥砂漿干縮性能的改善比較顯著。3)研究了相同摻量時,纖維酸度系數(shù)及纖維種類對水泥砂漿力學性能的影響。試驗結果顯示:酸度系數(shù)越大,纖維內(nèi)部的網(wǎng)絡結構間相互作用力越強,纖維耐堿性能越強,其對水泥基復合材料性能的改善效果越好。酸度系數(shù)為1.4的高爐渣纖維對水泥砂漿的增強效果優(yōu)于Mk=1.1、1.2、1.3的纖維。此外,高爐渣纖維對砂漿早期的增強效果要優(yōu)于玄武巖纖維及聚丙烯纖維。后期,由于高爐渣纖維的耐堿性能較差,其增強效果要弱于另外兩種纖維。4)研究了在混凝土基體中添加0.25%~2%的高爐渣纖維時,混凝土基體材料力學性能的變化情況。結果顯示:在添加質量分數(shù)為2%的纖維、養(yǎng)護28d后,試件抗壓強度增加7.27%,抗折強度增加17.42%,劈裂抗拉強度改善不明顯。
[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.
【學位授予單位】：華北理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528.572

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本文編號：1882457