發(fā)布時(shí)間：2018-04-18 16:29

  本文選題：再生混合混凝土 + 廢棄混凝土塊體�。� 參考：《廣州大學(xué)》2017年碩士論文

【摘要】：隨著社會(huì)經(jīng)濟(jì)的飛速發(fā)展,大量房屋建筑不斷興建耗費(fèi)了巨量的新混凝土,同時(shí)大量舊有建筑物的拆除也產(chǎn)生了巨量的廢棄混凝土。為了保護(hù)自然環(huán)境,實(shí)現(xiàn)建筑業(yè)的可持續(xù)發(fā)展,回收廢棄混凝土以減少新混凝土的生產(chǎn)勢(shì)在必行。再生混合混凝土是一種新的廢棄混凝土回收利用形式,其由大尺度廢棄混凝土塊體和新混凝土混合澆筑而成,將廢棄混凝土的回收利用從骨料層次上升為塊體層次,更加簡(jiǎn)化、高效、節(jié)能。本文在已有研究的基礎(chǔ)上,開(kāi)展了齡期和廢棄混凝土塊體取代率對(duì)再生混合混凝土抗壓性能的影響研究,利用掃描電鏡對(duì)再生混合混凝土的微觀結(jié)構(gòu)進(jìn)行了觀察分析,主要包括以下工作:分別對(duì)60個(gè)再生混合混凝土立方體試件和60個(gè)再生混合混凝土圓柱體試件進(jìn)行了單軸抗壓試驗(yàn),研究了廢棄混凝土塊體取代率(0、10%、20%、30%)和齡期(1d、3d、7d、14d、28d)等因素對(duì)再生混合混凝土抗壓性能(抗壓強(qiáng)度、彈性模量、峰值應(yīng)變)的影響。對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行了擬合分析,建立了齡期與再生混合混凝土抗壓強(qiáng)度、彈性模量等因素的關(guān)系式,得到了再生混合混凝土圓柱體試件抗壓強(qiáng)度與立方體試件抗壓強(qiáng)度之間的轉(zhuǎn)換系數(shù)。研究結(jié)果表明:(1)在廢棄混凝土塊體抗壓強(qiáng)度高于新混凝土抗壓強(qiáng)度情況下,隨著廢棄混凝土塊體取代率的增大,再生混合混凝土的抗壓強(qiáng)度不斷增大,彈性模量先增大后減小,峰值應(yīng)變先減小后增大;(2)當(dāng)廢棄混凝土塊體取代率保持不變時(shí),隨著齡期的不斷增加,再生混合混凝土的抗壓強(qiáng)度和彈性模量不斷增大,而峰值應(yīng)變不斷減小;(3)廢棄混凝土塊體的取代率對(duì)再生混合混凝土圓柱體試件抗壓性能的影響小于立方體試件,再生混合混凝土圓柱體試件抗壓強(qiáng)度與立方體試件抗壓強(qiáng)度之間的轉(zhuǎn)換系數(shù)較普通混凝土小;(4)基于擬合公式的計(jì)算結(jié)果與試驗(yàn)數(shù)據(jù)吻合較好。利用掃描電鏡等儀器設(shè)備,對(duì)再生混合混凝土的微觀形貌進(jìn)行了觀察,研究了再生混合混凝土微觀結(jié)構(gòu)隨齡期的變化,揭示了齡期對(duì)抗壓性能影響的微觀本質(zhì)。對(duì)比分析了新、舊水泥石基體的形貌特征及其水化產(chǎn)物,觀察了新—舊水泥石界面過(guò)渡區(qū)、新水泥石—新骨料界面過(guò)渡區(qū)與舊水泥石—舊骨料界面過(guò)渡區(qū)等的微觀結(jié)構(gòu),對(duì)新、舊水泥石基體以及新—舊水泥石界面過(guò)渡區(qū)進(jìn)行了定量分析。與抗壓試驗(yàn)結(jié)果相聯(lián)系,初步分析研究了齡期影響再生混合混凝土宏觀抗壓性能的微觀機(jī)理。試驗(yàn)結(jié)果表明:(1)新混凝土與廢棄混凝土塊體能夠良好結(jié)合,新—舊水泥石基體界面過(guò)渡區(qū)較為致密,而廢棄混凝土塊體內(nèi)部在使用前已存在部分缺陷,舊水泥石—舊骨料為再生混合混凝土最薄弱的環(huán)節(jié);(2)隨著齡期的不斷增長(zhǎng),水化產(chǎn)物C-S-H凝膠、Ca(OH)2和AFt晶體等不斷生長(zhǎng)及相互搭接使得基體結(jié)構(gòu)不斷致密,填充了部分裂紋,宏觀上表現(xiàn)為再生混合混凝土抗壓性能的增強(qiáng)。
[Abstract]:With the rapid development of social economy, a large number of housing buildings continue to build a huge amount of new concrete, at the same time, a large number of old buildings demolition also produced a huge amount of abandoned concrete.In order to protect the natural environment and realize the sustainable development of the construction industry, it is imperative to recycle the waste concrete to reduce the production of new concrete.Recycled mixed concrete is a new form of recycling waste concrete, which is made of large scale waste concrete block and new concrete mixed pouring. The recycling and utilization of recycled concrete is increased from aggregate level to block level, which is more simplified.High efficiency and energy saving.On the basis of the existing research, the influence of age and the replacement ratio of abandoned concrete blocks on the compressive performance of recycled mixed concrete is studied, and the microstructure of recycled mixed concrete is observed and analyzed by scanning electron microscope (SEM).The main contents are as follows: 60 recycled concrete cube specimens and 60 recycled mixed concrete cylindrical specimens are tested under uniaxial compression.The influence of the replacement rate of abandoned concrete blocks (0 / 10) and the age of 1 day / 3 d / 7 d / 14 d / 28d on the compressive strength, elastic modulus and peak strain of recycled concrete are studied.The fitting analysis of test data was carried out, and the relationship between age and compressive strength and elastic modulus of recycled mixed concrete was established.The conversion coefficient between the compressive strength of recycled concrete cylindrical specimens and the compressive strength of cubic specimens is obtained.The results show that when the compressive strength of abandoned concrete blocks is higher than that of new concrete blocks, the compressive strength of recycled mixed concrete increases with the increase of the replacement ratio of abandoned concrete blocks, and the elastic modulus increases first and then decreases.When the replacement rate of abandoned concrete blocks remains constant, the compressive strength and elastic modulus of recycled mixed concrete increase with the increase of age.The effect of replacement rate of abandoned concrete blocks on the compressive performance of recycled concrete cylindrical specimens is smaller than that of cubic specimens.The conversion coefficient between the compressive strength of recycled concrete cylindrical specimens and the compressive strength of cubic specimens is better than that of ordinary concrete. The calculated results based on the fitting formula are in good agreement with the experimental data.The microscopic morphology of recycled mixed concrete was observed by means of scanning electron microscope and other instruments. The change of microstructure of recycled mixed concrete with age was studied, and the microscopic essence of the influence of age on compressive resistance of recycled mixed concrete was revealed.The morphology and hydration products of the new and old cement-stone matrix were compared and analyzed. The microstructure of the new and old cement-stone interface transition zone, the new cement-new aggregate interface transition zone and the old cement-old aggregate interface transition zone were observed.The interfacial transition zone of old cement matrix and new-old cement stone was quantitatively analyzed.In connection with the results of compressive tests, the microscopic mechanism of age affecting the macroscopic compressive properties of recycled mixed concrete was analyzed and studied.The experimental results show that the new concrete and the abandoned concrete block can be well combined, the interface transition zone between the new and the old cement stone matrix is relatively compact, but there are some defects in the waste concrete block before the use of the new concrete block.Old cement stone and old aggregate are the weakest link of recycled mixed concrete. With the increasing of age, the hydration products, such as C-S-H gel, CaOHH2 and AFt crystals, grow and overlap with each other so that the matrix structure becomes compact and some cracks are filled.Macroscopically, the compressive performance of recycled mixed concrete is enhanced.
【學(xué)位授予單位】：廣州大學(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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