【摘要】：輕骨料混凝土具有質(zhì)量輕、耐火性能好、抗震性能佳、保溫隔熱效果好等優(yōu)點(diǎn),廣泛應(yīng)用于工民建及其他工程中。但是輕骨料混凝土的脆性比較大,容易發(fā)生開裂與脆性破壞,已經(jīng)限制其在現(xiàn)實(shí)工程中的應(yīng)用。研究發(fā)現(xiàn),在輕骨料混凝土中摻加適量的纖維可以改善其力學(xué)性能,能夠明顯提高輕骨料混凝土的抗拉和抗折性能,阻止裂縫的擴(kuò)展,改變其破壞形態(tài)。通過單摻玄武巖纖維、聚丙烯纖維對各種不同摻量下的纖維輕骨料混凝土試塊進(jìn)行相關(guān)力學(xué)性能試驗(yàn)、表觀密度和保溫隔熱性能試驗(yàn)研究,最終確定出最佳摻量,并進(jìn)行節(jié)能設(shè)計(jì)。將玄武巖纖維和聚丙烯纖維兩個(gè)因素作為參數(shù)進(jìn)行了試驗(yàn)設(shè)計(jì),玄武巖纖維摻量為 Okg/m3、1kg/m3、2kg/m3、3kg/m3,聚丙烯纖維摻量為 Okg/m3、0.3kg/m3、0.6kg/m3、0.9kg/m3。其中基本力學(xué)性能試驗(yàn)總共設(shè)計(jì)7組試驗(yàn),對不同纖維摻量下的輕骨料混凝土進(jìn)行抗壓強(qiáng)度、劈裂抗拉強(qiáng)度、抗折強(qiáng)度對比,在確定最佳摻量為玄武巖纖維摻量3kg/m3后,還進(jìn)行了輕骨料混凝土的干表觀密度試驗(yàn)和保溫隔熱性能試驗(yàn)�？箟簭�(qiáng)度試驗(yàn)表明,在單摻玄武巖纖維情況下,玄武巖纖維在摻量為3kg/m3時(shí)對輕骨料混凝土的抗壓強(qiáng)度增長幅度最大;在單摻聚丙烯纖維時(shí),除了摻量為0.3kg/m3的聚丙烯纖維使得輕骨料混凝土抗壓強(qiáng)度增長了 3.3%,其他兩種摻量都對輕骨料混凝土的抗壓強(qiáng)度有不同程度的降低。在破壞形態(tài)方面聚丙烯纖維和玄武巖纖維能夠較好的減少試塊的裂縫數(shù),使其破壞呈現(xiàn)出塑性破壞狀態(tài)。劈裂抗拉強(qiáng)度試驗(yàn)表明,無論是摻加玄武巖纖維還是聚丙烯纖維,對于輕骨料混凝土的劈裂抗拉強(qiáng)度都起到了較好的增強(qiáng)作用。單摻玄武巖纖維時(shí),對于輕骨料混凝土的劈裂抗拉強(qiáng)度增強(qiáng)效果均達(dá)到了 30%以上,其中在玄武巖纖維摻量為1kg/m3時(shí),輕骨料混凝土劈裂抗拉強(qiáng)度增長率最高為35%,而在摻量為3kg/m3時(shí)劈裂抗拉強(qiáng)度也增強(qiáng)了 33.9%。摻加聚丙烯纖維后,對于提高輕骨料混凝土的劈裂抗拉強(qiáng)度有明顯的效果,在摻量為0.3kg/m3時(shí)對輕骨料混凝土的劈裂抗拉強(qiáng)度增強(qiáng)效果最高,增長率為27%。抗折強(qiáng)度試驗(yàn)表明,玄武巖纖維和聚丙烯纖維的摻入,均能夠提高輕骨料混凝土的抗折強(qiáng)度。隨著聚丙烯纖維或玄武巖纖維摻量的增加,抗折強(qiáng)度也逐漸增加。比較兩種纖維對輕骨料混凝土力學(xué)性能的增強(qiáng)效果,發(fā)現(xiàn)聚丙烯纖維對其抗壓強(qiáng)度、抗折強(qiáng)度提高效果不明顯,而玄武巖纖維不僅能夠稍微改善輕骨料混凝土的抗壓強(qiáng)度,而且能夠明顯改善其劈裂抗拉性能和抗折性能,最終確定玄武巖纖維在摻量為3kg/m3時(shí)為最佳纖維摻量。在節(jié)能設(shè)計(jì)中,纖維輕骨料混凝土墻板的節(jié)能效果能夠滿足規(guī)范要求。
[Abstract]:Lightweight aggregate concrete is widely used in civil engineering and other projects because of its advantages of light weight, good fire resistance, good seismic performance and good thermal insulation effect. However, lightweight aggregate concrete is more brittle and prone to cracking and brittle failure, which has restricted its application in practical engineering. It is found that adding appropriate amount of fiber to lightweight aggregate concrete can improve its mechanical properties, improve the tensile and flexural properties of lightweight aggregate concrete, prevent the crack from spreading and change its failure pattern. Through the experiments of mechanical properties, apparent density and heat insulation properties of fiber lightweight aggregate concrete samples with different contents of single doped basalt fiber and polypropylene fiber, the optimum content was finally determined. And carry on the energy saving design. Two factors, basalt fiber and polypropylene fiber, were used as parameters in the experiment design. The content of basalt fiber was Okg/m3,1kg/m3,2kg/m3,3kg/m3, polypropylene fiber and the content of polypropylene fiber was Okg/m3,0.3kg/m3,0.6kg/m3,0.9kg/m3.. Among them, 7 groups of basic mechanical property tests were designed. The compressive strength, splitting tensile strength and flexural strength of lightweight aggregate concrete with different fiber content were compared. After determining the optimum addition amount of basalt fiber 3kg/m3, The dry apparent density test and thermal insulation test of lightweight aggregate concrete were also carried out. The results of compressive strength test show that the compressive strength of lightweight aggregate concrete increases greatly when basalt fiber is doped with 3kg/m3, and when polypropylene fiber is added alone, the compressive strength of lightweight aggregate concrete increases greatly when the content of basalt fiber is 3kg/m3. The compressive strength of lightweight aggregate concrete is increased by 3.3% due to the addition of polypropylene fiber (0.3kg/m3), and the other two kinds of fiber have different degree of decrease on the compressive strength of lightweight aggregate concrete. Polypropylene fiber and basalt fiber can reduce the number of cracks in the specimen and show plastic failure state. The splitting tensile strength tests show that both basalt fiber and polypropylene fiber can enhance the splitting tensile strength of lightweight aggregate concrete. When basalt fiber is added alone, the splitting tensile strength of lightweight aggregate concrete can be enhanced by more than 30%, especially when the content of basalt fiber is 1kg/m3, The maximum growth rate of splitting tensile strength of lightweight aggregate concrete is 35%, while the splitting tensile strength of lightweight aggregate concrete increases by 33.9 when the content of 3kg/m3 is added. The effect of adding polypropylene fiber on the splitting tensile strength of lightweight aggregate concrete is obvious. When the content of 0.3kg/m3 is added, the effect of strengthening the splitting tensile strength of lightweight aggregate concrete is the highest, and the growth rate is 27%. The flexural strength tests show that the addition of basalt fiber and polypropylene fiber can improve the flexural strength of lightweight aggregate concrete. With the increase of polypropylene fiber or basalt fiber content, the flexural strength increases gradually. Comparing the mechanical properties of lightweight aggregate concrete with two kinds of fibers, it is found that polypropylene fiber can not improve the compressive strength and flexural strength of lightweight aggregate concrete, but basalt fiber can not only improve the compressive strength of lightweight aggregate concrete, but also improve the compressive strength of lightweight aggregate concrete. Moreover, the splitting tensile and flexural properties of basalt fiber can be improved obviously. Finally, the optimum content of basalt fiber is determined when the content of basalt fiber is 3kg/m3. In the energy-saving design, the energy-saving effect of fiber-light aggregate concrete wallboard can meet the requirements of specifications.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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