本文選題：混雜纖維　切入點：高強混凝土　出處：《遼寧工業(yè)大學(xué)》2014年碩士論文

【摘要】：混凝土至今仍是全世界用量最大、應(yīng)用最廣泛的建筑材料，但其存在抗拉強度低、脆性大和易開裂的缺點。在混凝土中摻加纖維有助于克服混凝土材料的先天缺陷。同研究相對成熟的單摻纖維混凝土相比，采用不同品質(zhì)、不同幾何形態(tài)纖維混摻而成的混雜纖維混凝土，可以從不同層次上改善纖維三維分布的均衡性以及集料與纖維的協(xié)調(diào)作用，提高增強效率。 本文通過正交試驗設(shè)計對C60高強混凝土的配合比進行優(yōu)化研究，檢驗拌合物的工作性能和28d強度，得出最優(yōu)配合比；運用極差和方差分析量化了各因素對力學(xué)性能的影響水平。在最佳配合比下?lián)饺氩煌瑩搅康木郾├w維和鋼纖維，配制出混雜纖維高強混凝土，并對基本力學(xué)性能和耐久性能進行試驗研究，分析了混雜纖維對C60高強混凝土的增強增韌效果和對抗凍性、抗海水侵蝕性的影響。主要的研究如下： （1）研究了不摻纖維、單摻纖維、混雜纖維以及不同纖維摻入量對C60高強混凝土基本力學(xué)性能（立方體抗壓性能、軸心抗壓性能、劈拉性能和抗折性能）和耐久性（抗凍性能和抗海水侵蝕性能）的影響。 （2）定義了評價混雜纖維混凝土混雜效應(yīng)的指標—混雜系數(shù)的計算公式，利用混雜系數(shù)系統(tǒng)地分析和對比了不同情況下纖維對C60高強混凝土基本力學(xué)性能和耐久性能的影響。 研究分析的結(jié)果顯示： （1）單摻鋼纖維時高強混凝土的抗壓強度、軸心抗壓強度、劈拉強度和抗折強度都有一定程度的提高。單摻聚丙烯纖維使抗壓強度和軸心抗壓強度略有下降的影響，而對劈拉強度和抗折強度都有很好的提高作用。當二者混摻時，高強混凝土的抗壓強度、軸心抗壓強度、劈拉強度和抗折強度都要比不摻纖維的混凝土高，但混雜效果取決于纖維摻量及比例； （2）對纖維混凝土和不摻纖維混凝土進行凍融循環(huán)試驗和海水侵蝕試驗，發(fā)現(xiàn)纖維混凝土的抗凍性能和耐腐蝕性能都明顯優(yōu)于不摻纖維混凝土。同時也發(fā)現(xiàn)，，混雜纖維的摻量和比例對高強混凝土抗凍性能和耐腐蝕性能有很大影響。
[Abstract]:The maximum amount of concrete is still the world, the most widely used building materials, but it has low tensile strength, brittle and easy to crack. The shortcomings of the fibers in the concrete mixing helps to overcome the defects of concrete materials. With the research on single doped fiber concrete is relatively mature compared with different quality, hybrid fiber reinforced concrete fiber mixed with different geometric shapes and coordination function can improve the balance of the three-dimensional distribution of fiber aggregates and fibers from different levels, and improve efficiency.
This paper through the orthogonal experimental design of C60 high strength concrete mix proportion optimization, test of mixture working performance and strength of 28d, the optimal mixing ratio; the use of range analysis and variance analysis to quantify the effect of each factor level. On the mechanical properties of polypropylene fiber and steel fiber in different dosage ratio of mixed in with the best. Preparation of hybrid fiber reinforced high-strength concrete, and the experimental study on basic mechanical properties and durability, the method of strengthening toughening effect and frost resistance of hybrid fibers on C60 high strength concrete, the influence of seawater erosion resistance. The main research are as follows:
(1) the effects of fiber content, single fiber, hybrid fiber and different fiber contents on the basic mechanical properties (cube compressive strength, axial compressive strength, splitting tensile and flexural properties) and durability (frost resistance and seawater erosion resistance) of C60 high strength concrete were studied.
(2) defined the index of hybrid fiber reinforced concrete, the calculation formula of the hybrid coefficient. The influence of fiber on the basic mechanical properties and durability of C60 high strength concrete under different conditions is systematically analyzed and compared by using the hybrid coefficient.
The results of the research and analysis show that:
(1) single steel fiber high strength concrete compressive strength, axial compressive strength, splitting tensile strength and flexural strength were improved. Influence of PP fiber on the compressive strength and compressive strength decreased slightly, and has a very good role in improving the splitting tensile strength and flexural strength two. When mixing, concrete compressive strength, axial compressive strength, splitting tensile strength and flexural strength are lower than those without fiber concrete is high, but the confounding effect depends on the fiber content and proportion;
(2) of fiber concrete and fiber reinforced concrete subjected to freeze-thaw cycle test and erosion test, found that the frost resistance of fiber reinforced concrete and corrosion resistance are better than no fiber concrete. It is also found that the content and proportion of hybrid fiber on the frost resistance of high strength concrete and corrosion resistance are greatly affected.

【學(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

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