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玻化微珠保溫砂漿的改性研究

發(fā)布時(shí)間:2018-02-05 23:49

  本文關(guān)鍵詞: ;⒅ 保溫砂漿 人工碳化 碳酸鈣 出處:《重慶大學(xué)》2014年碩士論文 論文類(lèi)型:學(xué)位論文


【摘要】:玻化微珠保溫砂漿的體積吸水率遠(yuǎn)低于珍珠巖保溫砂漿,耐火性遠(yuǎn)高于聚苯乙烯顆粒保溫砂漿,其產(chǎn)品的抗壓強(qiáng)度相對(duì)較高,導(dǎo)熱率也相對(duì)較低,因而迅速占領(lǐng)了市場(chǎng)。普通的;⒅楸厣皾{在外墻外保溫的施工過(guò)程中,由于產(chǎn)品質(zhì)量的參差不齊,操作的不規(guī)范,現(xiàn)場(chǎng)難以監(jiān)管,導(dǎo)致新建建筑的節(jié)能效果不夠理想,因而在重慶、北京等城市已被禁止使用。鑒于此,我們?cè)谄胀ú;⒅楸厣皾{的基礎(chǔ)上摻入18~20%的石灰對(duì)其進(jìn)行改性研究,并為制成水泥鈣基玻化微珠保溫砂漿復(fù)合板制品提供參考。 通過(guò)成型養(yǎng)護(hù)試驗(yàn),確定了攪拌時(shí)間、用水量、養(yǎng)護(hù)條件對(duì)水泥鈣基玻化微珠保溫砂漿性能的影響;通過(guò)正交試驗(yàn),確定初步的配合比,進(jìn)一步通過(guò)單因素試驗(yàn)優(yōu)化分析,確定120kg/m3;⒅榈挠昧吭44.8%,使用120kg/m3;⒅榇_定水泥的最佳用量(不包括粉煤灰的用量)為30%~34%,,粉煤灰或漂珠等量取代水泥的最優(yōu)摻量為10%,憎水劑摻量可選用0.1%,乳膠粉的摻量為1.8~2.0%,羥丙基甲基纖維素醚的最佳摻量為0.2%,聚丙烯纖維的最佳用量為0.4%,聚苯顆粒取代;⒅榈淖罴延昧繛3%;最后以此優(yōu)化后的配合比成型水泥鈣基玻化微珠保溫砂漿試塊,并對(duì)其進(jìn)行干密度、抗壓強(qiáng)度、保溫隔熱性、收縮性、抗裂性、耐火性的試驗(yàn)分析。 本文采用人工碳化試驗(yàn),分析摻入18~20%的石灰對(duì)水泥鈣基;⒅楸厣皾{的特殊影響與作用。經(jīng)過(guò)初步碳化試驗(yàn)后,采用掃描電子顯微鏡對(duì)試塊進(jìn)行微觀形貌掃描,發(fā)現(xiàn)要利用氫氧化鈣的碳化生成碳酸鈣晶體來(lái)提高水泥鈣基;⒅楸厣皾{的致密度和強(qiáng)度,必須控制二氧化碳的濃度;通過(guò)不斷改變?cè)噳K碳化時(shí)二氧化碳的濃度,發(fā)現(xiàn)低二氧化碳濃度有利于生長(zhǎng)的碳酸鈣晶體被水泥水化產(chǎn)物包裹從而促使水泥鈣基玻化微珠保溫砂漿結(jié)構(gòu)致密化,最終確定有利的二氧化碳濃度為20000PPM;再通過(guò)XRD、EDS能譜分析,確定水泥鈣基;⒅楸厣皾{碳化后生成了大量的碳酸鈣晶體,這些碳酸鈣晶體在水泥鈣基玻化微珠保溫砂漿的毛細(xì)孔中沉積,使得毛細(xì)孔細(xì)化,有利于后期強(qiáng)度的顯著增長(zhǎng)。
[Abstract]:The volume water absorption rate of glass microbead insulation mortar is far lower than that of perlite insulation mortar, and the fire resistance is much higher than that of polystyrene particle insulation mortar. The compressive strength of the product is relatively high and the thermal conductivity is relatively low. As a result, it quickly occupied the market. Ordinary glass microbead insulation mortar in the construction process of external insulation, because the product quality is uneven, the operation is not standard, the site is difficult to supervise. As a result, the energy efficiency of new buildings is not ideal, so cities such as Chongqing and Beijing have been banned from use. On the basis of ordinary vitrified microbead insulation mortar, 1820% lime was added to modify the mortar, and a reference was provided for the preparation of cement calcium based glass microbead thermal insulation mortar composite board. The effects of mixing time, water consumption and curing conditions on the properties of cement calcium based vitrified microbeads thermal insulation mortar were determined by forming and curing test. Through the orthogonal test, the initial mix ratio was determined, and the amount of vitrified beads of 120kg / m3 was determined to be 44.8% by further optimization analysis of single factor test. The optimum dosage of cement (excluding fly ash) was determined by using 120 kg / m ~ 3 glass microbeads. The optimum amount of cement replaced by fly ash or drifter was 10%. The dosage of hydrophobic agent is 0.1, the content of latex powder is 1.80.The optimum dosage of hydroxypropyl methyl cellulose ether is 0.2, and the optimum dosage of polypropylene fiber is 0.4%. The optimum dosage of polystyrene particles to replace glass beads is 3. Finally, the optimized mix ratio is used to form the cement calcium based vitrified microbead insulation mortar, and the dry density, compressive strength, thermal insulation, shrinkage, crack resistance and fire resistance of the mortar are analyzed. In this paper, artificial carbonization test was used to analyze the special effect and effect of 18 ~ 20% lime on cement calcium based vitrified microbead thermal insulation mortar. Scanning electron microscope (SEM) was used to scan the microstructure of the samples, and it was found that calcium carbonate crystals should be formed by carbonation of calcium hydroxide to improve the density and strength of cement calcium based vitrified microbeads thermal insulation mortar. The concentration of carbon dioxide must be controlled; By changing the concentration of carbon dioxide during carbonization, it was found that the calcium carbonate crystals with low carbon dioxide concentration were encapsulated by the hydration products of cement, thus promoting the structure densification of cement calcium based glass microbeads thermal insulation mortar. The beneficial carbon dioxide concentration was determined to be 20 000 PPMs; Through the energy spectrum analysis of XRDX EDS, it was determined that a large number of calcium carbonate crystals were formed after carbonization of cement calcium based glass bead heat preservation mortar. These calcium carbonate crystals are deposited in the capillary pores of the cement calcium based vitrified microbeads, which make the capillary pores fine, which is conducive to the significant increase of the later strength.
【學(xué)位授予單位】:重慶大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:TU551;TU578.1

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