本文關(guān)鍵詞： 鋰渣 再生混凝土粗骨料 基本力學(xué)性能 梁的受剪性能　出處：《新疆大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著建筑行業(yè)工業(yè)化、生態(tài)化進(jìn)程的不斷深化,社會對于建筑廢棄物循環(huán)使用的呼聲越來越高。由于廢棄混凝土的再生利用能同時解決垃圾堆放和資源循環(huán)利用兩個問題,故對其研究已變成一個熱點(diǎn)問題。鋰鹽在生產(chǎn)的時候會伴隨有工業(yè)廢料鋰渣生成,不能得到有效利用,對環(huán)境造成污染。根據(jù)已有研究可知,將鋰渣作為摻合料加入混凝土中,在減少污染的同時,對混凝土部分性能有改善作用。建立在課題組前期對再生混凝土粗骨料及鋰渣利用現(xiàn)狀研究的基礎(chǔ)上,將廢棄混凝土及鋰渣兩者拌合使用后進(jìn)行分析,在減少污染的同時也能帶來一定的社會效益。同時在研究過程中得到的經(jīng)驗(yàn)教訓(xùn)給后來學(xué)者對于摻鋰渣再生混凝土開展深層次的分析及在實(shí)際工程中的推廣使用提供參考。本研究是將烏魯木齊周邊的廢棄混凝土分類破碎篩分為粒徑在4.75mm 31.5mm間且顆粒級配不間斷的骨料,并將摻合料鋰渣摻入再生混凝土中,對摻入不同鋰渣和取代不同再生粗骨料的受剪梁進(jìn)行試驗(yàn)分析,同時對伴隨梁的混凝土試塊的抗折、立方體抗壓、抗拉及棱柱體抗壓等強(qiáng)度問題進(jìn)行分析;對受剪試驗(yàn)梁的破壞形態(tài)特征及發(fā)展過程、跨中彎曲開裂荷載和斜向開裂荷載以及試驗(yàn)梁的受剪承載力和斜裂縫的產(chǎn)生及發(fā)展等問題做出相應(yīng)的分析。經(jīng)過分析可以發(fā)現(xiàn):鋰渣和再生粗骨料的混合使用在一定程度上可以改善混凝土的力學(xué)性能及梁的受剪性能。相對于基準(zhǔn)混凝土強(qiáng)度,當(dāng)再生粗骨料替代率為30%、鋰渣摻量為20%時,試件立方體抗壓、軸心抗壓強(qiáng)度可分別提高39.9%、48.22%,當(dāng)再生粗骨料替代率為50%、鋰渣摻量為20%,試件劈裂抗拉和抗折強(qiáng)度可分別提高48.41%、15.77%,且經(jīng)過分析可知當(dāng)再生粗骨料替代率為30%、鋰渣摻量為20%時整體配比最好。試驗(yàn)梁的破壞過程及破壞形態(tài)與普通混凝土梁相似,且符合平截面假定;跨中開裂荷載和受剪承載力在再生粗骨料取代50%鋰渣摻入20%時達(dá)到最大,相對于普通受剪梁分別提高46.91%、20.48%,并提出適用于試驗(yàn)梁的跨中開裂荷載、斜向開裂荷載及受剪承載力的經(jīng)驗(yàn)計算式;試驗(yàn)梁裂縫產(chǎn)生及發(fā)展與普通混凝土相似,斜裂縫寬度隨鋰渣摻量不斷增大而逐步減小,隨再生粗骨料替代率的增加而不斷降低,并提出適用于試驗(yàn)梁的斜裂縫寬度計算公式。
[Abstract]:With the industrialization of the construction industry and the deepening of the ecological process, the society is calling for the recycling of construction waste more and more. Because the recycling of waste concrete can simultaneously solve the two problems of garbage stacking and resource recycling, Therefore, the study of lithium salt has become a hot issue. Lithium salt will be accompanied by the production of industrial waste lithium slag, which can not be used effectively and cause pollution to the environment. According to the existing research, lithium slag is added to concrete as admixture. At the same time of reducing pollution, some properties of concrete are improved. On the basis of the research on the utilization of recycled concrete coarse aggregate and lithium slag, the waste concrete and lithium slag are mixed and used. At the same time, the experience and lessons gained in the course of research will give scholars a deep analysis of the recycled concrete with lithium slag and its application in practical engineering. In this study, the waste concrete around Urumqi was classified and sifted into aggregates with a particle size of 4.75 mm or 31.5 mm and uninterrupted gradation. Adding lithium slag into recycled concrete, the shear beam with different lithium slag and replacing different recycled coarse aggregate is tested and analyzed. At the same time, the flexural and cubic compression resistance of concrete test block with beam is analyzed. The tensile strength and the compressive strength of the prism are analyzed, and the failure characteristics and development process of the shear test beam are analyzed. The problems such as bending cracking load and oblique cracking load in span, shear bearing capacity of test beam and the generation and development of inclined crack are analyzed. It can be found that the mixed use of lithium slag and recycled coarse aggregate can be obtained from the analysis of the composite of lithium slag and recycled coarse aggregate. To some extent, the mechanical properties of concrete and the shear behavior of beams can be improved. When the replacement ratio of recycled coarse aggregate is 30 and the amount of lithium slag is 20, the cube of the specimen is compressed. The axial compressive strength can be increased by 39.9% and 48.22%, respectively. When the replacement rate of regenerated coarse aggregate is 50 and the amount of lithium slag is 20, the tensile and flexural strength of the specimens can be increased by 48.41 and 15.77 respectively, and the analysis shows that when the replacement ratio of regenerated coarse aggregate is 30 and the amount of lithium slag is 20%, The failure process and failure pattern of the test beam are similar to that of the ordinary concrete beam. And it accords with the assumption of plane section that the crack load and shear capacity in span reach the maximum when regenerated coarse aggregate replaces 50% lithium slag and 20%, and increases 46.91 and 20.48 respectively compared with ordinary shear beam, and puts forward the crack load in the span suitable for test beam. The empirical formula for calculating the oblique cracking load and shear capacity, the crack generation and development of the test beam are similar to that of the ordinary concrete, the width of the oblique crack decreases gradually with the increase of lithium slag content, and decreases with the increase of the replacement ratio of recycled coarse aggregate. A formula for calculating the width of slant crack is presented.
【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528

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