本文選題：廢棄混凝土 + 廢砂漿粉��； 參考：《廣東工業(yè)大學(xué)》2015年碩士論文

【摘要】：中國(guó)已經(jīng)步入了城鎮(zhèn)化的加速階段,眾多舊有建筑物的拆除與改造必然產(chǎn)生大量廢棄混凝土。如果廢棄混凝土隨意占地堆放,既會(huì)造成嚴(yán)重的環(huán)境污染,又是巨大的資源浪費(fèi)。近年來(lái)人們對(duì)廢棄混凝土的再生利用局限于作為再生骨料使用,針對(duì)廢棄混凝土中廢砂漿組分的利用研究也較少。從原料成本上看,廢砂漿是廢棄混凝土中成本較高的“精華”,作為再生骨料利用并沒(méi)充分體現(xiàn)其價(jià)值；且附著廢砂漿的再生骨料性能較差,制造再生骨料過(guò)程中大量的微細(xì)顆粒被丟棄。但廢砂漿塊易磨性能好,特別是經(jīng)過(guò)煅燒熱處理后更容易粉磨,磨細(xì)耗能相對(duì)較低。根據(jù)用于水泥混合材的細(xì)度要求,廢砂漿的這種特點(diǎn)為其作為水泥混合材利用帶來(lái)很大的可能性。為了提高廢砂漿的回收利用價(jià)值和克服再生骨料的缺陷,本文對(duì)如何高效分離及球磨粉碎廢棄混凝土中的砂漿組分進(jìn)行機(jī)理分析。在實(shí)驗(yàn)基礎(chǔ)上,獲得廢砂漿粉的基本物理性能,以及化學(xué)激發(fā)劑改性及高溫煅燒方法兩種方法對(duì)廢砂漿粉混合水泥力學(xué)性能改善的影響,找到了充分激發(fā)廢砂漿粉活性獲取高活性廢砂漿粉的方法。本文主要研究?jī)?nèi)容及成果如下：(1)通過(guò)對(duì)廢棄混凝土中砂漿組分分離及球磨粉碎機(jī)理的分析,提出了界面過(guò)渡區(qū)原理,研究機(jī)械球磨粉碎和煅燒熱處理對(duì)廢砂漿組分物理化學(xué)結(jié)構(gòu)的改變,以及該改變對(duì)廢砂漿組分的回收效率和粉磨性能的影響。得出延長(zhǎng)球磨時(shí)間t、提高研磨介質(zhì)質(zhì)量m和高度h,以及高于500℃煅燒熱處理的方法都有利于廢砂漿的分離收集和磨細(xì)；且在500℃-600℃這一溫度區(qū)間煅燒后的粗骨料性能保持良好,可回收高品質(zhì)的再生骨料的結(jié)論。(2)研究了廢砂漿粉替代部分水泥對(duì)混合水泥標(biāo)準(zhǔn)稠度需水量、流動(dòng)度和強(qiáng)度等性能的影響。實(shí)驗(yàn)結(jié)果表明廢砂漿粉吸水率較大,細(xì)度和摻量都會(huì)影響強(qiáng)度,0.08mm篩余率為2.7%的廢砂漿粉活性指數(shù)可達(dá)77%。混合水泥折壓比有所增長(zhǎng),材料延性較好。(3)研究了利用化學(xué)激發(fā)劑對(duì)廢砂漿粉進(jìn)行改性。結(jié)果表明摻0.5%FDN-A減水劑對(duì)摻30%廢砂漿粉混合水泥膠砂流動(dòng)度的改性效果較好,FDN-A減水劑、二水石膏、硅酸鈉、硫酸鈉都有利于提高廢砂漿粉混合水泥的強(qiáng)度,改性效果較好,并得出各化學(xué)激發(fā)劑的最佳摻量及最優(yōu)化配方。(4)研究了不同煅燒溫度對(duì)廢砂漿塊易磨性、流動(dòng)度的影響以及廢砂漿粉的活性激發(fā)效果。實(shí)驗(yàn)表明,經(jīng)600℃熱處理,摻30%廢砂漿粉混合水泥的28天強(qiáng)度增長(zhǎng)了3.01MPa,結(jié)合分離廢棄混凝土中砂漿組分的最佳溫度在500℃～600℃這一結(jié)論,確定了600℃是分離和激發(fā)廢砂漿活性的最佳溫度。(5)基于化學(xué)激發(fā)劑最優(yōu)化配方,對(duì)經(jīng)過(guò)600℃熱處理的熱活化廢砂漿粉進(jìn)行化學(xué)激發(fā)劑改性。當(dāng)廢砂漿粉摻量為20%、30%時(shí),混合水泥的28天抗壓強(qiáng)度可達(dá)48.61MPa和45.03MPa,基本符合42.5水泥強(qiáng)度等級(jí)要求,當(dāng)摻量為40%、50%時(shí),也能配制出基本符合32.5強(qiáng)度等級(jí)要求的混合水泥,當(dāng)摻量更高時(shí)可作為低強(qiáng)度等級(jí)混合水泥使用。
[Abstract]:China has stepped into the accelerating stage of urbanization. The demolition and reconstruction of many old buildings will inevitably produce a large number of waste concrete. If the waste concrete is stacked at random, it will cause serious environmental pollution and huge waste of resources. In recent years, the regeneration and utilization of abandoned coagulant soil is limited to the regenerated aggregate in recent years. There is less research on the utilization of waste mortar components in waste concrete. From the cost of raw materials, waste mortar is the "essence" of high cost in waste concrete. As recycled aggregate, it does not fully reflect its value; and the recycled aggregate of waste mortar is poor, and a large number of fine particles are made in the process of producing recycled aggregate. Discarded. But the waste mortar blocks are easily grindable, especially after calcined heat treatment. The grinding energy is relatively low. According to the requirements for the fineness of the cement mixture, the characteristics of the waste mortar will bring a great possibility for its use as a cement mixture. In order to improve the recycling value of the waste mortar and overcome the regenerated bone On the basis of the experiment, the basic physical properties of the waste mortar powder, and the effect of the two methods of chemical activator modification and high temperature calcination on the mechanical properties of the mixed cement cement are found, and the full excitation is found. The main contents and results of this paper are as follows: (1) the principle of interface transition zone was put forward by analyzing the separation of mortar components and grinding mechanism in waste concrete, and the change of physical and chemical structure of waste mortar components was studied by mechanical milling and calcining heat treatment. And the effect of the change on the recovery efficiency and the grinding performance of the waste mortar components. It is concluded that the prolongation of the ball milling time t, the improvement of the quality of the grinding medium M and the height h, and the calcining heat treatment above 500 centigrade are beneficial to the separation and refinement of the waste mortar, and the coarse aggregate performance after the calcined at the temperature range of 500 degrees centigrade is good. Well, the conclusion of high quality recycled aggregate can be recovered. (2) the effect of waste mortar powder instead of part cement on the water requirement, fluidity and strength of the standard consistency of mixed cement is studied. The experimental results show that the water absorption rate of the waste mortar powder is larger, the fineness and admixture will affect the strength, and the activity index of the waste mortar powder with the residual rate of 2.7% 0.08mm is up to 7. The ratio of 7%. mixed cement increased and the material ductility was better. (3) the modification of waste mortar powder was studied using chemical activator. The results showed that the modified effect of 0.5%FDN-A admixture on the mixing of cement mortar mixed with 30% waste mortar powder was better, FDN-A water reducing agent, two water stone, sodium silicate and sodium sulphate were all beneficial to the improvement of waste mortar powder. The strength of mixed cement has good modification effect, and the optimum dosage and optimum formula of each chemical activator are obtained. (4) the effect of different calcination temperature on the grindability, the fluidity and the activation effect of the waste mortar powder are studied. The experiment shows that the strength of the mixed cement with 30% waste mortar powder increases at the temperature of 600 degrees centigrade. 3.01MPa, combining the conclusion that the optimum temperature of mortar components in separated concrete is 500 to 600 degrees C, the optimum temperature for separating and stimulating the activity of waste mortar is determined at 600. (5) based on the optimum formula of chemical activator, the chemical activator is modified by the heat activated waste sand pulp after 600 C heat treatment. When the amount is 20%, 30%, the 28 day compressive strength of the mixed cement can reach 48.61MPa and 45.03MPa, which basically meets the requirement of 42.5 cement strength grade. When the amount of mixing is 40% and 50%, it can also make up the mixed cement which basically meets the requirements of the 32.5 strength grade, and can be used as a low strength grade mixed cement when the amount is higher.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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相關(guān)期刊論文 前10條

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本文編號(hào)：2001797