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  本文選題：建筑垃圾　切入點：再生細骨料　出處：《濟南大學》2015年碩士論文

【摘要】：據(jù)統(tǒng)計僅汶川地震產(chǎn)生的建筑垃圾近六億噸,不但占用大量土地資源,而且對當?shù)厮�、空氣、土壤造成嚴重污�?當前隨著我國國民經(jīng)濟建設(shè)步伐的不斷加快,如何科學合理的利用建筑垃圾成為亟需解決的問題。將建筑垃圾中的廢棄混凝土、廢棄砂漿經(jīng)破碎、清洗、分級等工藝制得再生骨料,用于替代天然骨料制備再生混凝土、再生膠砂,可有效利用建筑垃圾。然而再生骨料的壓碎指標和吸水率較高對再生混凝土性能影響較大,再生骨料—水泥石界面層是再生混凝土最薄弱區(qū)域,而再生骨料與水泥石的界面結(jié)合性能不如天然骨料,降低了再生混凝土的性能。本文研究內(nèi)容包括采用無機改性、有機改性改性以及有機-無機復(fù)合改性的方式對再生細骨料進行改性:首先分析了不同改性方式對再生細骨料物理性能的影響,包括表觀密度、吸水率、孔隙率以及壓碎指標;其次分析了再生細骨料的改性對建筑垃圾再生細骨料水泥砂漿(簡稱再生膠砂)性能的影響,主要包括力學性能、耐久性、界面層厚度以及微觀形貌分析;最后本文針對不同改性方式對再生細骨料的表面改性機理進行分析,并構(gòu)建了再生細骨料表面微觀結(jié)構(gòu)模型。經(jīng)試驗研究得出:1.與天然骨料相比,再生細骨料具有密度小,吸水率、孔隙率大以及壓碎指標值高的特點。再生細骨料10min吸水率為其24h吸水率的82.7%,制備再生膠砂其力學性能、耐久性較差。2.無機改性再生細骨料,通過15wt%的礦渣漿液與5wt%的水玻璃溶液復(fù)合改性時改性效果較好。結(jié)合SEM圖,未改性再生細骨料試樣其表面存在較大的微裂紋,孔隙較多,結(jié)構(gòu)疏松;而經(jīng)水玻璃溶液改性后,水玻璃固化生成的凝膠能夠在其表面形成一層粘結(jié)膜,表面結(jié)構(gòu)致密,同時促進了礦渣微粉,降低了吸水率。3.有機改性再生細骨料,采用10wt%的PVA溶液改性時,降低了其吸水率,改性效果較好,然而VAE乳液對骨料物理性能的作用不明顯。4.采用10wt%礦渣微粉漿液、5wt%水玻璃溶液以及10wt%的PVA溶液復(fù)合改性骨料試樣其吸水率為2.3%,壓碎指標值為8.7%。礦渣微粉漿液對再生細骨料的改性效果較明顯,與其較小的粒度且較高的活性指數(shù)息息相關(guān)。5.對傳統(tǒng)的再生膠砂制備工藝進行改進,采用預(yù)浸泡10min處理再生細骨料的“水泥裹砂”二次攪拌工藝,改善了再生膠砂的力學性能與耐久性。6.針對再生膠砂的ITZ界面層厚度,無機改性起到了一定效果,而粉煤灰改性效果較差,有機-無機復(fù)合改性再生膠砂試樣其界面過渡區(qū)厚度集中在20μm~30μm。7.針對再生膠砂的氣孔率,礦渣微粉與水玻璃復(fù)合改性試樣MA9其氣孔率為14.9%,與未改性再生膠砂試樣相比,降低了57.2%。有機-無機復(fù)合改性顯著改善了再生膠砂試樣的氣孔率。8.針對再生膠砂的力學性能,礦渣和水玻璃復(fù)合改性后顯著提高了再生膠砂的力學性能,而有機改性對再生膠砂的力學影響作用不明顯。有機-無機復(fù)合改性效果較好,其中改性再生膠砂試樣MC6其抗折強度提高了27.6%,抗壓強度提高了41.6%,抗壓強度與基準水泥砂漿試樣相差僅4.9%。9.針對再生膠砂的干燥收縮性能,粉煤灰改性效果較差,有機改性再生膠砂的干燥收縮值影響較小。這主要是由于粉煤灰顆粒較大且活性較低,難以在水化初期起到對再生膠砂的干燥收縮的抑制作用。針對再生膠砂的抗凍融性能,無機改性、有機改性、有機-無機復(fù)合改性對再生膠砂的抗凍性能作用效果較好。綜上所述,本文經(jīng)試驗研究得出再生細骨料的最佳改性方案為:10wt%礦渣微粉漿液、5wt%水玻璃溶液以及10wt%的PVA溶液。10.針對再生膠砂的微觀結(jié)構(gòu),未改性再生細骨料—水泥石界面過渡區(qū)ITZ存在較大尺寸的六方板狀CH晶體,且晶體間存在較大氣孔,而改性再生細骨料—水泥石界面過渡區(qū)僅可見小尺寸板狀CH晶體,水化產(chǎn)物C-S-H凝膠、鈣礬石等互相穿插,結(jié)構(gòu)致密,無明顯氣孔、孔隙�；趥鹘y(tǒng)的“水泥石”理論,提出了再生細骨料微觀結(jié)構(gòu)模型。
[Abstract]:According to statistics, only the Wenchuan earthquake construction waste generated nearly six hundred million tons, not only occupy a lot of land resources, and the air of local water, soil, causing serious pollution, with the current pace of national economic construction in China is accelerating, how to scientific and reasonable utilization of construction waste is needed to solve the problem. The waste concrete in the construction waste waste mortar, crushing, washing, grading process of recycled aggregate replacing natural aggregate, for the preparation of recycled concrete, recycled mortar, effective use of construction waste. However, crushed recycled aggregate index and high water absorption has great influence on the performance of recycled concrete, recycled aggregate cement stone interface layer is the most recycled concrete the weak area, with better performance of natural aggregate and aggregate and cement stone regeneration interface, reduces the performance of recycled concrete. The research contents of this paper include the use of inorganic Modification, organic modification and organic inorganic composite modification of recycled fine aggregate was modified: the first analysis of the influence of different modification methods of recycled fine aggregate physical properties, including apparent density, water absorption, porosity and crushing index; followed by analysis of the modified cement mortar of fine aggregate construction waste recycling of recycled fine aggregate (the recycled mortar) properties, including mechanical properties, durability, analysis of the interface layer thickness and microstructure; finally, according to the different modification methods on the mechanism of surface modification of recycled fine aggregate was analyzed, and the construction of the recycled fine aggregate surface microstructure model. It is concluded that: 1. compared with natural aggregate, recycled fine aggregate has small density, water absorption rate, high porosity and high crushing value. The characteristics of recycled fine aggregate water absorption rate of 10min for the 24h water absorption rate of 82.7%, Preparation of recycled mortar mechanical properties, durability of.2. inorganic modified recycled fine aggregate, the slag slurry and 5wt% 15wt% composite modified water glass solution modified better. Combined with the SEM diagram, the unmodified recycled fine aggregate on the surface of specimen are more micro cracks, pores more structure osteoporosis; through the water glass solution modified water glass curing the gel to form a layer of adhesive film on its surface, compact surface structure, and promote the slag, reduce the water absorption rate of.3. organic modification of recycled fine aggregate, using the 10wt% PVA solution is modified, the water absorption rate decreased however, the modification effect is better, the role of VAE on the properties of emulsion aggregate physical is not obvious by using 10wt%.4. 5wt% micro slag slurry, water glass solution and 10wt% solution of PVA composite modified aggregate samples and the water absorption rate was 2.3%, crushing index value of 8.7%. slag powder The slurry of recycled fine aggregate modification effect is obvious, granularity and high activity index and smaller is closely related to the traditional.5. recycled mortar preparation process was improved by pre soaking 10min processing of recycled fine aggregate cement wrapped sand two mixing process, the thickness of ITZ interface layer improved reclaimed sand the mechanical properties and durability of recycled mortar for.6., inorganic modification played a certain effect, but the modified fly ash effect is poor, the organic-inorganic composite modified recycled mortar specimens of the ITZ thickness in 20 m~30 m.7. for the rate of recycled mortar porosity, slag powder composite with water the modification of glass specimen MA9 the porosity was 14.9%, compared with the unmodified recycled mortar, reduces the 57.2%. organic-inorganic composite mechanical properties of modified significantly improve the porosity of recycled mortar specimens for.8. rate of recycled mortar, slag Glass and water after composite modification significantly improves the mechanical properties of recycled mortar, and organically modified mechanics of reclaimed rubber sand effect is not obvious. Organic inorganic compound modification effect, the modification of recycled mortar specimens MC6 the flexural strength increased 27.6%, compressive strength increased by 41.6%. The compressive strength of the cement mortar specimen was only 4.9%.9. benchmark for recycled mortar dry shrinkage performance of modified fly ash effect is poor, the dry shrinkage of organic modification of recycled mortar value has little effect. This is mainly because the fly ash particles were large and low activity, difficult in the inhibition of the early hydration to the dry shrinkage of recycled mortar. The mortar for regeneration of freeze-thaw resistance, inorganic modification, organic modification, organic inorganic compound modification effect on the frost resistance of recycled mortar is better. In summary, through the experimental investigation to regeneration The best modification scheme of fine aggregate is 10wt% micro slag slurry, the microstructure of recycled mortar for 5wt% and 10wt% PVA solution of water glass solution.10., unmodified six plate CH crystal of recycled fine aggregate and cement paste interfacial transition zone ITZ has larger size, and the crystal between the larger pores the modification of recycled fine aggregate and cement paste interfacial transition zone is visible only small size plate CH crystal, the hydration products of C-S-H gel, ettringite and interspersed with each other, compact structure, no obvious pores, pores. The traditional "cement" based on the theory, put forward the fine aggregate micro structure model of regeneration.

【學位授予單位】：濟南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU578.1

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