【摘要】：隨著經(jīng)濟(jì)和社會(huì)的飛速發(fā)展,能源消耗量急劇增多,煤炭、天然氣等不可再生資源日益短缺,因此國(guó)家對(duì)建筑提出了節(jié)能、低碳、環(huán)保的要求。在建筑行業(yè)中,建筑能耗大,高耗能建筑比例大,建筑節(jié)能狀況落后,加快建筑節(jié)能建設(shè)勢(shì)在必行。改進(jìn)墻體的保溫隔熱性能是建筑節(jié)能的重要組成部分,墻體保溫隔熱材料將是建筑材料發(fā)展的新趨勢(shì)。本文針對(duì)小麥秸稈-鎂水泥復(fù)合保溫砂漿在潮濕環(huán)境下使用時(shí)存在的吸潮返鹵、強(qiáng)度損失大等耐水性能方面的缺陷,通過使用四種不同外加劑組成的復(fù)合外加劑對(duì)小麥秸稈-鎂水泥復(fù)合保溫砂漿進(jìn)行了耐水性能改性研究,從宏觀性能、水化產(chǎn)物穩(wěn)定性和微觀孔結(jié)構(gòu)等角度探討了復(fù)合外加劑對(duì)復(fù)合保溫砂漿強(qiáng)度及耐水性能的影響規(guī)律,為其進(jìn)一步研究提供了理論依據(jù)和數(shù)據(jù)支持。首先,通過閱讀相關(guān)文獻(xiàn),確定合適的外加劑及其摻量范圍,選取小麥秸稈-鎂水泥復(fù)合保溫砂漿的耐水性能評(píng)價(jià)指標(biāo),了解砂漿內(nèi)部水化硬化機(jī)理,學(xué)習(xí)水泥基材料孔隙結(jié)構(gòu)的相關(guān)知識(shí)及孔徑測(cè)試分析方法。其次,選取焦磷酸鈉、硫酸亞鐵、有機(jī)酸、硅灰等四種外加劑組成復(fù)合外加劑,并根據(jù)四種外加劑的摻量設(shè)計(jì)正交試驗(yàn),通過正交試驗(yàn)測(cè)試四種外加劑對(duì)復(fù)合保溫砂漿耐水性能的影響順序并確定四種外加劑的最優(yōu)摻量。然后,對(duì)比分析基準(zhǔn)組和最優(yōu)組試件的宏觀性能,通過XRD衍射圖譜分析基準(zhǔn)組和最優(yōu)組試件粉末樣本的內(nèi)部水化產(chǎn)物的物相組成,探討外加劑對(duì)復(fù)合保溫砂漿內(nèi)部水化產(chǎn)物的影響,通過壓汞試驗(yàn)對(duì)試樣內(nèi)部微觀孔結(jié)構(gòu)進(jìn)行分析,探討外加劑對(duì)其內(nèi)部微觀孔結(jié)構(gòu)的影響。最后,文中對(duì)試驗(yàn)過程中小麥秸稈-鎂水泥復(fù)合保溫砂漿試件表面出現(xiàn)吸潮返鹵現(xiàn)象的原因進(jìn)行了分析,并結(jié)合原因提出了改善其抗吸潮返鹵性能的措施,以便于減弱其吸潮返鹵的弊端,提高其在實(shí)際工程應(yīng)用時(shí)的性能表現(xiàn),有利于其進(jìn)一步推廣應(yīng)用。經(jīng)過試驗(yàn)研究得出,復(fù)合外加劑的加入,能夠顯著提高小麥秸稈-鎂水泥復(fù)合保溫砂漿在各齡期的強(qiáng)度,并能有效改善復(fù)合保溫砂漿的耐水性能,其XRD衍射圖譜和壓汞試驗(yàn)結(jié)果表明,摻入復(fù)合外加劑可以提高砂漿5·1·8相的穩(wěn)定性,可以降低砂漿的總孔隙率,提高密實(shí)度,同時(shí)可以改變孔徑分布,使內(nèi)部孔結(jié)構(gòu)更加合理,從而提高砂漿的強(qiáng)度和耐水性能。
[Abstract]:With the rapid development of economy and society, the energy consumption is increasing rapidly, and the non-renewable resources such as coal and natural gas are in short supply. Therefore, the country has put forward the requirements of energy saving, low carbon and environmental protection to the construction. In the construction industry, the construction energy consumption is large, the high energy consumption construction proportion is large, the building energy saving condition is backward, it is imperative to speed up the building energy saving construction. Improving the thermal insulation performance of wall is an important part of building energy saving, and wall insulation material will be a new trend in the development of building materials. In this paper, the water resistance defects of wheat straw and magnesium cement composite thermal insulation mortar used in wet environment, such as moisture absorption and halogenation, high strength loss and so on, are pointed out. The water resistance of wheat straw and magnesium cement composite thermal insulation mortar was studied by using four kinds of composite admixtures. The effects of composite admixtures on the strength and water resistance of composite insulating mortar were discussed from the point of view of the stability of hydration products and micropore structure, which provided theoretical basis and data support for its further study. First of all, through reading the relevant literature to determine the appropriate admixture and its range of content, select wheat straw and magnesium cement composite insulation mortar water resistance evaluation index, understand the internal hydration hardening mechanism of mortar. Learn about the pore structure of cement-based materials and pore size measurement and analysis methods. Secondly, four admixtures, sodium pyrophosphate, ferrous sulfate, organic acid and silica fume, are selected to form the composite admixture, and the orthogonal test is designed according to the content of the four admixtures. The influence sequence of four admixtures on the water resistance of composite insulating mortar was tested by orthogonal test and the optimum addition of the four admixtures was determined. Then, the macroscopical properties of the base group and the optimal sample were compared and the phase composition of the internal hydration products of the base group and the optimal group were analyzed by XRD diffraction pattern. The effect of admixture on the internal hydration products of composite insulating mortar was discussed. The micropore structure of the sample was analyzed by mercury injection test, and the influence of admixture on the internal micropore structure was discussed. Finally, the causes of moisture absorption and halogenation on the surface of wheat straw and magnesium cement composite insulation mortar during the test are analyzed, and the measures to improve the resistance to moisture absorption and halogen recovery are put forward. In order to reduce its drawback of moisture absorption and return halogen, improve its performance in practical engineering application, it is beneficial to its further popularization and application. The experimental results show that the strength of wheat straw and magnesium cement composite thermal insulation mortar can be significantly improved with the addition of composite admixture, and the water resistance of composite insulation mortar can be improved effectively. The XRD diffraction pattern and mercury injection test results show that adding compound admixture can improve the stability of 518 phase of mortar, reduce the total porosity of mortar, increase the compactness, change the pore size distribution, and make the internal pore structure more reasonable. Thus, the strength and water resistance of mortar are improved.
【學(xué)位授予單位】：山東農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU578.1

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