本文選題：玄武巖纖維 + 混凝土�。� 參考：《重慶交通大學》2015年碩士論文

【摘要】：玄武巖纖維有著優(yōu)越的力學性能,并具有耐高溫、耐酸堿、價格低廉、取材便利以及生產過程環(huán)保等優(yōu)點,逐漸成為混凝土增強領域的新興材料,玄武巖纖維增強混凝土的研究也受到越來越多的關注。本文主要針對玄武巖纖維增強混凝土的力學性能和耐久性能進行了試驗研究和微觀檢測分析,并得出下列結論:①研究了不同體積分數的(0.05%、0.10%、0.15%、0.20%、0.25%、0.30%、0.35%)玄武巖纖維對混凝土的工作性能和力學性能的影響,并結合微觀結構檢測分析了玄武巖纖維對混凝土增強、阻裂和增韌的作用機理。結果表明,適量的玄武巖纖維摻入混凝土后,混凝土的工作性能有一定的降低,但抗壓強度、劈裂抗拉強度和抗彎強度均有不同程度的提高,并且混凝土的韌性得到顯著增強。②研究了不同質量分數的(5%、10%、15%、20%、25%、30%)粉煤灰、礦粉分別與玄武巖纖維復合對混凝土的工作性能和力學性能的影響。結果表明,礦物摻合料的摻入對玄武巖纖維增強混凝土的工作性能以及28d抗壓強度均有顯著的改善與增強效果,但降低了玄武巖纖維增強混凝土的劈裂抗拉強度、抗彎強度以及韌性。③通過相對滲透法和孔結構檢測從宏觀和微觀兩方面研究了玄武巖纖維摻量對混凝土抗?jié)B性能的影響,并探討了玄武巖纖維改善混凝土抗?jié)B性能的作用機理。研究結果表明:當玄武巖纖維體積分數從0.05%增加到0.10%時,混凝土的抗?jié)B性能得到改善;而當玄武巖纖維體積分數大于0.20%時,混凝土中的黏結界面迅速增加,且混凝土中累計孔體積也迅速增大,過多的薄弱界面極易形成裂縫源,從而降低了混凝土的抗?jié)B性能。④當玄武巖纖維體積分數為0.05%~0.15%時,經5%的Na2SO4溶液侵蝕60d后,混凝土抗壓強度侵蝕系數基本保持在1左右。但隨著纖維摻量的進一步增加,混凝土抗壓強度侵蝕系數呈現出下滑態(tài)勢。當混凝土中摻入0.05%~0.25%體積分數的玄武巖纖維時,雖然混凝土劈裂抗拉強度侵蝕系數小于1,但玄武巖纖維的摻入延緩了混凝土劈裂抗拉強度的損失速度,混凝土抗硫酸鹽侵蝕作用得到加強。
[Abstract]:Basalt fiber, with its excellent mechanical properties, high temperature resistance, acid and alkali resistance, low price, convenient material selection and environmental protection in the production process, has gradually become a new material in the field of concrete reinforcement. More and more attention has been paid to the study of basalt fiber reinforced concrete. In this paper, the mechanical properties and durability of basalt fiber reinforced concrete are studied experimentally and microscopically. And the following conclusions are drawn: 1 the influence of basalt fibers on the working and mechanical properties of concrete is studied in different volume fractions of 0.05 and 0.100.10 and 0.15 and 0.20, 0.25, 0.30 and 0.35, respectively, and the reinforcement of concrete by basalt fibers is analyzed by means of microstructural testing. The mechanism of crack resistance and toughening. The results show that when basalt fiber is mixed with concrete, the working performance of concrete decreases, but the compressive strength, splitting tensile strength and flexural strength are improved to some extent. Moreover, the toughness of concrete has been significantly enhanced .2 the effects of different mass fraction of 101010 and 101010 and 20% of different mass fraction on the working and mechanical properties of concrete are studied. The effects of fly ash, mineral powder and basalt fiber on the working performance and mechanical properties of concrete are studied respectively, and the effect of fly ash, mineral powder and basalt fiber on the performance and mechanical properties of concrete is studied. The results show that the addition of mineral admixtures can significantly improve the working performance and 28d compressive strength of basalt fiber reinforced concrete, but decrease the splitting tensile strength of basalt fiber reinforced concrete. The influence of the content of basalt fiber on the impermeability of concrete was studied from macroscopic and microcosmic aspects by relative permeation method and pore structure measurement of flexural strength and toughness. The mechanism of improving the impermeability of concrete by basalt fiber is discussed. The results show that when the volume fraction of basalt fiber is increased from 0.05% to 0.10%, the impermeability of concrete is improved, but when the volume fraction of basalt fiber is greater than 0.20, the bonding interface in concrete increases rapidly. And the accumulative pore volume in concrete also increases rapidly, too much weak interface easily forms the crack source, thus reduces the impermeability of concrete. 4. When the volume fraction of basalt fiber is 0.05-0.15, the concrete is corroded by 5% Na2SO4 solution for 60 days. The compressive strength erosion coefficient of concrete is about 1. However, with the further increase of fiber content, the compressive strength erosion coefficient of concrete shows a downward trend. When 0. 05% basalt fiber is added into concrete, although the concrete splitting tensile strength erosion coefficient is less than 1, the loss rate of concrete splitting tensile strength is delayed by the addition of basalt fiber. The resistance of concrete to sulfate erosion is strengthened.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：1945311