【摘要】：使用再生混凝土粗骨料代替天然骨料制備混凝土,可以節(jié)約資源,降低污染,形成可循環(huán)利用的資源,對(duì)社會(huì)發(fā)展帶來(lái)積極影響。但是再生混凝土因再生骨料的天然缺陷導(dǎo)致再生混凝土內(nèi)部微裂紋、空隙較多,使混凝土抗壓強(qiáng)度、抗拉強(qiáng)度等性能降低,制約了再生混凝土的廣泛應(yīng)用。在再生混凝土中加入聚丙烯纖維以研究聚丙烯纖維對(duì)再生混凝土梁受彎性能的影響。 首先制備尺寸、配合比、再生骨料取代率及纖維摻量相同的普通混凝土、聚丙烯纖維混凝土、再生混凝土和聚丙烯纖維再生混凝土四個(gè)組別的標(biāo)準(zhǔn)立方體試塊測(cè)試其28天抗壓強(qiáng)度,結(jié)果表明聚丙烯纖維混凝土立方體試塊抗壓強(qiáng)度較普通混凝土增大3%,再生混凝土立方體試塊抗壓強(qiáng)度較普通混凝土降低9.7%,聚丙烯纖維再生混凝土立方體試塊抗壓強(qiáng)度較再生混凝土提高5.2%。對(duì)聚丙烯纖維再生混凝土破壞界面進(jìn)行電鏡掃描微觀觀測(cè),可以看出聚丙烯纖維再生混凝土中再生骨料與砂漿粘結(jié)界面裂縫寬度與再生混凝土相比較小,砂漿中微裂紋與空隙數(shù)量較少,纖維與砂漿破壞狀態(tài)為纖維拔出型破壞,纖維阻裂作用十分明顯。 制備參數(shù)與混凝土立方體標(biāo)準(zhǔn)試塊相同的四個(gè)組別混凝土梁,對(duì)其受彎性能進(jìn)行試驗(yàn),對(duì)比分析它們開(kāi)裂荷載、承載能力極限狀態(tài)荷載、撓度變化、裂縫擴(kuò)展?fàn)顟B(tài),以檢測(cè)聚丙烯纖維對(duì)再生混凝土梁受彎性能的影響。對(duì)四組別混凝土梁開(kāi)裂荷載和極限荷載進(jìn)行理論計(jì)算,探討現(xiàn)行計(jì)算公式對(duì)聚丙烯纖維再生混凝土梁計(jì)算的可靠度。經(jīng)試驗(yàn)結(jié)果分析得出再生混凝土梁開(kāi)裂彎矩較普通混凝土梁降低8.2%,聚丙烯纖維混凝土梁開(kāi)裂彎矩大于普通混凝土梁9.1%,聚丙烯纖維再生混凝土梁開(kāi)裂彎矩較再生混凝土梁提高14.1%；達(dá)到承載能力極限狀態(tài)時(shí),再生混凝土梁最大裂縫寬度高于普通混凝土梁16.1%,高于聚丙烯纖維再生混凝土梁23.2%,纖維阻裂效用明顯；彈塑性階段相同荷載作用下?lián)饺刖郾├w維混凝土梁撓度值較普通混凝土梁與再生混凝土梁整體剛度較好,最終破壞完全失去承載能力時(shí),普通混凝土梁撓度值高于再生混凝土梁15%,聚丙烯纖維混凝土梁撓度值高于普通混凝土梁15.5%,聚丙烯纖維再生混凝土梁撓度值高于再生混凝土梁16%,摻入聚丙烯纖維后混凝土梁整體剛度與延性明顯提高；四組試件達(dá)到承載能力極限狀態(tài)時(shí),再生混凝土承載力測(cè)量值小于普通混凝土梁6.9%,聚丙烯纖維混凝土梁承載力試驗(yàn)值高于普通混凝土梁4.5%,聚丙烯纖維混凝土梁承載力測(cè)量值高于再生混凝土梁4.5%,摻入聚丙烯纖維可以提高混凝土梁的承載能力極限狀態(tài)承載力。 最后應(yīng)用ANSYS軟件對(duì)混凝土梁受彎進(jìn)行非線性數(shù)值模擬分析,進(jìn)一步比對(duì)分析聚丙烯纖維對(duì)再生混凝土梁受彎性能的影響,模擬試驗(yàn)結(jié)果與實(shí)際試驗(yàn)結(jié)果較為接近,承載能力極限狀態(tài)下,再生混凝土梁撓度值為6.351mm,,聚丙烯纖維再生混凝土梁撓度值為6.09mm；聚丙烯纖維再生混凝土梁模擬承載能力極限狀態(tài)荷載值為144.53kN,較再生混凝土梁荷載模擬值增大3.2%。
[Abstract]:The recycled concrete coarse aggregate is used to replace natural aggregate to prepare concrete, which can save resources, reduce pollution, and form recyclable resources and have positive influence on social development. However, the natural defects of the recycled concrete lead to the micro-cracks in the recycled concrete, the void is more, the compressive strength and the tensile strength of the concrete are reduced, and the wide application of the recycled concrete is restricted. Polypropylene fiber was added to the recycled concrete to study the effect of the polypropylene fiber on the flexural properties of the regenerated concrete beam. The normal concrete, the polypropylene fiber concrete, the recycled concrete and the polypropylene fiber regenerated concrete are prepared by first preparing the normal concrete, the polypropylene fiber concrete, the recycled concrete and the polypropylene fiber regenerated concrete, The results show that the compressive strength of the test block of the polypropylene fiber concrete cube is 3% higher than that of the common concrete, the compressive strength of the recycled concrete cube is less than that of the ordinary concrete by 9. 7%, and the compressive strength of the test block of the polypropylene fiber is higher than that of the recycled concrete. It can be seen that the crack width of the recycled aggregate and the mortar bonding interface in the recycled concrete of the polypropylene fiber is less than that of the recycled concrete, and the micro-cracks and the number of voids in the mortar can be seen. the damage state of the fiber and the mortar is less, the fiber resistance cracking effect is very good, It is obvious that the preparation parameters are the same as that of the concrete cube standard test block, and the bending performance of the concrete beams is tested, and the cracking load, the bearing capacity limit state load, the deflection change and the crack are compared and analyzed. Joint expansion state to detect the bending of the recycled concrete beam by the polypropylene fiber The effect of the performance on the cracking load and ultimate load of the four-group concrete beam is calculated, and the current calculation formula is discussed in this paper. The results of the test show that the crack bending moment of the regenerated concrete beam is lower than that of the ordinary concrete beam by 8.2%, the cracking moment of the polypropylene fiber concrete beam is larger than that of the ordinary concrete beam, and the cracking moment of the polypropylene fiber reinforced concrete beam is higher than that of the regenerated concrete beam. 14. 1%; when the limit state of the bearing capacity is reached, the maximum crack width of the recycled concrete beam is higher than that of the ordinary concrete beam (16.1%), which is higher than that of the polypropylene fiber regenerated concrete beam (22.3%), and the fiber resistance The crack effect is obvious; the deflection value of the concrete beam of the polypropylene fiber is better than that of the ordinary concrete beam and the regenerated concrete beam under the same loading action in the elastic-plastic phase, and the deflection value of the common concrete beam is higher than that of the regenerative concrete beam when the ultimate failure completely loses the bearing capacity. The deflection value of the concrete beam of the polypropylene fiber is higher than that of the ordinary concrete beam by 15%, the deflection value of the polypropylene fiber reinforced concrete beam is higher than that of the recycled concrete beam, and the overall rigidity and the ductility of the concrete beam after the incorporation of the polypropylene fiber are obviously improved; and the four groups of test pieces reach the bearing capacity. In the limit state, the measured value of the bearing capacity of the recycled concrete is less than 60.9% of the common concrete beam, the test value of the bearing capacity of the polypropylene fiber concrete beam is higher than that of the common concrete beam, and the measured value of the bearing capacity of the polypropylene fiber concrete beam is higher than that of the recycled concrete. The load capacity limit of the concrete beam can be improved by the incorporation of the polypropylene fiber in 4.5% of the beam The state-carrying capacity of the concrete beam is simulated by using the ANSYS software, and the influence of the polypropylene fiber on the bending performance of the regenerated concrete beam is further compared, and the simulation test result is close to the actual test result, and the bearing capacity In the capacity limit state, the deflection value of the regenerated concrete beam is 6.351mm, and the deflection value of the regenerated concrete beam of the polypropylene fiber is 6.09mm; the ultimate state load value of the simulated bearing capacity of the polypropylene fiber regenerated concrete beam is 144.53kN, and the load die of the regenerated concrete beam
【學(xué)位授予單位】：延邊大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU377

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