本文選題：再生骨料　切入點：再生混凝土　出處：《浙江大學》2017年碩士論文　論文類型：學位論文

【摘要】：建筑垃圾資源化,它既滿足了我國快速的工業(yè)化、城鎮(zhèn)化進程,又兼顧到了環(huán)境問題,是建筑垃圾處理的正確出路。再生骨料是將廢棄混凝土塊經過破碎、清洗、篩選,形成的可以再次作為混凝土粗骨料使用的材料。再生骨料根據(jù)不同的粒徑范圍分為再生細骨料與再生粗骨料。而再生骨料與天然骨料的不同物理性能指標,使其配制的再生混凝土與普通混凝土性能有很大的區(qū)別。其中,再生細骨料對混凝土的性能影響極大,在工程應用中并不具有經濟性,而再生粗骨料對混凝土的影響一般可以通過某些方式進行改善,具有應用的價值。本文的研究對象是再生粗骨料,通過對其物理性能、力學性能的測試,結合數(shù)理統(tǒng)計,針對再生粗骨料的幾項物理性能指標之間的關系,以及再生混凝土的強度離散性問題進行討論。并在細微觀的層面對再生混凝土的破壞現(xiàn)象進行描述。首先,使用再生骨料取代部分天然骨料,取代的比例分別為0%、3 0%、5 0%、80%、100%,由此形成混合骨料,測試了骨料的吸水率、壓碎指標、表觀密度。結果表明:再生骨料與天然骨料形成的混合骨料是符合混合定律的。結合一些文獻中不同來源的再生骨料的45個測試數(shù)據(jù)來分析三個物理性能指標的相關關系,發(fā)現(xiàn):吸水率與表觀密度存在一定的線性關系。利用線性擬合的辦法來描述兩者的關系是比較合理的。若想提高擬合的精度,可以采用二項式表達。線性表達與二項式表達的適用范圍為吸水率值大于5%的骨料。不同來源再生粗骨料的吸水率與壓碎指標的數(shù)值關系離散性大,無法得到具有普適性的公式。其次,配制再生粗骨料取代率為0%,30%,50%,80%,100%的再生混凝土,每組測試21個試件的28d抗壓強度。結果表明:隨著再生粗骨料的取代率增加,再生混凝土強度降低;再生粗骨料的加入使再生混凝土的抗壓強度標準偏差隨取代率呈現(xiàn)出“中間大兩邊小”的現(xiàn)象;通過假設檢驗的方法,驗證了在顯著水平α = 0.5時,再生混凝土的強度概率分布是符合正態(tài)分布的。最后,為了觀察再生混凝土的破壞情況,采用3種不同配合比的再生混凝土,再生混凝土的破化形態(tài)與普通混凝土相同,高水灰比時是砂漿的破壞,低水灰比時是再生粗骨料的劈裂。納米壓痕觀察低水灰比下再生混凝土的界面過渡區(qū)情況,發(fā)現(xiàn):再生粗骨料巖石部分-新砂漿界面(新界面)的界面過渡區(qū)長度為55μm左右,而再生粗骨料巖石部分-舊砂漿界面(舊界面)的界面過渡區(qū)并不明顯。新砂漿的硬度高于舊砂漿,新界面的硬度與舊界面的硬度相近,再生粗骨料成為體系的薄弱環(huán)節(jié)。
[Abstract]:The recycling of construction waste not only satisfies the rapid industrialization and urbanization of our country, but also takes into account the environmental problems, and is the correct way out for the disposal of construction waste. The recycled aggregate can be used as concrete coarse aggregate again. The recycled aggregate can be divided into recycled fine aggregate and regenerated coarse aggregate according to different particle size ranges. The properties of recycled concrete are different from that of ordinary concrete. The recycled fine aggregate has great influence on the performance of concrete, and is not economical in engineering application. However, the influence of recycled coarse aggregate on concrete can be improved in some ways, which has the value of application. The research object of this paper is recycled coarse aggregate, through the test of its physical and mechanical properties, combined with mathematical statistics, The relationship between several physical properties of recycled coarse aggregate and the strength dispersion of recycled concrete are discussed. The failure phenomenon of recycled concrete is described in detail. Some natural aggregates were replaced by recycled aggregates, with a ratio of 0 / 30 / 50 / 50 / 100, which formed a mixture of aggregates. The water absorption and crushing indexes of aggregates were tested. The results show that the mixed aggregate formed by recycled aggregate and natural aggregate obeys the law of mixing. Combining 45 test data of recycled aggregate from different sources in some literature, the correlation of three physical performance indexes is analyzed. It is found that there is a linear relationship between water absorption and apparent density. It is reasonable to use linear fitting to describe the relationship. The binomial expression can be used. The applicable range of linear expression and binomial expression is aggregate with water absorption ratio greater than 5%. The relationship between water absorption rate of regenerated coarse aggregate from different sources and crushing index is discrete. The formula with universal applicability can not be obtained. Secondly, the recycled concrete with a replacement ratio of 0% and 30% and 50% and 80% / 100% of recycled coarse aggregate is prepared. The 28d compressive strength of 21 specimens is tested in each group. The results show that the replacement rate of recycled coarse aggregate increases with the increase of the replacement rate of recycled coarse aggregate. The strength of recycled concrete is decreased, the standard deviation of compressive strength of recycled concrete is "large and small" with the substitution rate, and it is verified by hypothesis test that at the significant level 偽 = 0.5, The strength probability distribution of recycled concrete is in accordance with the normal distribution. Finally, in order to observe the failure of recycled concrete, three kinds of recycled concrete with different mix ratio are adopted, and the broken form of recycled concrete is the same as that of ordinary concrete. High water-cement ratio is the destruction of mortar, and low water-cement ratio is the splitting of recycled coarse aggregate. Nanometer indentation is used to observe the interfacial transition zone of recycled concrete under low water-cement ratio. It is found that the length of the interfacial transition zone between the rock part of recycled coarse aggregate and the new mortar interface (new interface) is about 55 渭 m. The hardness of the new mortar is higher than that of the old mortar, and the hardness of the new interface is close to that of the old interface, and the recycled coarse aggregate becomes the weak link of the system.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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