發(fā)布時(shí)間：2018-03-21 23:19

  本文選題：路基工程　切入點(diǎn)：建筑垃圾　出處：《長(zhǎng)安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著城市化進(jìn)程的加快,建筑垃圾的產(chǎn)量與日俱增,造成嚴(yán)重的環(huán)境污染。合理的利用建筑垃圾,將其用于公路路基中,不僅可以解決對(duì)環(huán)境的污染,還可以緩解路用材料匱乏的問題。我國(guó)對(duì)建筑垃圾的研究起步較晚,很多技術(shù)都不成熟,對(duì)建筑垃圾作為路基填料的研究較少,本文參考了已有的研究結(jié)果,初步摸索出一套室內(nèi)試驗(yàn)研究方法,旨在通過室內(nèi)試驗(yàn)了解建筑垃圾的抗干濕及抗凍融性能。本文依托西咸北環(huán)線高速公路工程,通過基本物理試驗(yàn),研究了建筑垃圾的基本物理力學(xué)指標(biāo)。同時(shí)對(duì)不同配合比的建筑垃圾試件進(jìn)行抗凍、抗干濕試驗(yàn),并分析了塑性應(yīng)變、彈性模量在凍融及干濕條件下的變化規(guī)律。另外,通過自主發(fā)明的CT掃描模具專利,實(shí)現(xiàn)了對(duì)建筑垃圾試件的CT掃描,分析了在分層擊實(shí)條件下微觀孔隙率隨高度的變化規(guī)律;材料配合比與孔隙率之間的關(guān)系以及不同層位處孔隙率隨凍融次數(shù)的變化規(guī)律。并嘗試通過微觀孔隙率變化對(duì)建筑垃圾宏觀力學(xué)現(xiàn)象進(jìn)行解釋。研究表明,干濕循環(huán)和凍融循環(huán)均會(huì)導(dǎo)致建筑垃圾試樣累積塑性應(yīng)變?cè)龃�、彈性模量減小。10次凍融為建筑垃圾塑性應(yīng)變及彈性模量變化的拐點(diǎn),超過該值以后塑性應(yīng)變及彈性模量變化速度明顯加快;60次干濕循環(huán)亦為兩指標(biāo)變化的拐點(diǎn),大于該值后,兩指標(biāo)變化速度顯著減緩。凍融條件下,建筑垃圾彈性模量及累計(jì)塑性應(yīng)變變化與微觀孔隙變化具有相關(guān)性�？紫堵势骄黾�7%時(shí),彈性模量減小約13%,累計(jì)塑性應(yīng)變?cè)龃蠹s20%;當(dāng)孔隙率平均增加20%時(shí),彈性模量減小約40%,累計(jì)塑性應(yīng)變?cè)龃蠹s50%。
[Abstract]:Along with the city to speed up the process, construction waste production grow with each passing day, causing serious environmental pollution. The utilization of construction waste, be used in highway roadbed, not only can solve the environmental pollution, can also relieve the road material shortage. The research of construction waste in China started late, many technologies are not mature, construction waste as roadbed research less, this reference to the existing research results, initially worked out a laboratory test method to anti wet understanding of construction waste through the indoor test and anti freeze thaw performance. This paper relies on the West Ham Nol expressway project, through the basic physical test, the basic physical and mechanical indexes study on construction waste. At the same time of different proportion of construction waste specimens of antifreeze, anti dry test, and plastic strain analysis, elastic modulus in freeze-thaw and dry Changes of wet conditions. In addition, the CT scan mold patent invented, the CT scan specimens of the construction waste, analyzes the compaction conditions in layered micro porosity with height variation; the relationship between material mix ratio and porosity and porosity in different layers varies with the number of freeze-thaw. And try to explain the changes of the construction waste through the micro porosity macro mechanical phenomenon. The research results show that the wet dry cycles and freeze-thaw cycles may result in construction waste sample cumulative plastic strain increases, the elastic modulus decreases.10 freeze-thaw for construction waste inflection point plastic strain and elastic modulus change, more than the value of plastic strain and elastic modulus change significantly faster; the 60 dry wet cycle is also two inflection point index changes, larger than the value after the change rate of two indicators significantly slow. Under the condition of freezing and thawing, construction The construction waste elastic modulus and accumulated plastic strain change and micro pore changes associated with porosity. An average increase of 7%, the elastic modulus decreases about 13%, the cumulative plastic strain increased by about 20%; when the porosity increased by 20% on average, the elastic modulus decreases about 40%, the cumulative plastic strain increased by about 50%.

【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414;X799.1

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本文編號(hào)：1646019