本文選題：泡沫混凝土 + 復(fù)合板　； 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：為了適應(yīng)現(xiàn)代建筑中節(jié)能、防火、環(huán)保等的要求,具有相關(guān)優(yōu)點(diǎn)的無(wú)機(jī)保溫材料日益成為現(xiàn)代建筑節(jié)能材料發(fā)展的重要方向。其中,泡沫混凝土具有輕質(zhì)、保溫隔熱、隔音、不燃和抗震等優(yōu)良特性,可較好地滿足建筑節(jié)能和提高建筑安全性的要求,成為現(xiàn)代建筑節(jié)能研究的熱點(diǎn)。但由于其強(qiáng)度低、易粉化、干燥收縮大等缺點(diǎn),制約了其在墻體材料領(lǐng)域的應(yīng)用。為了解決這些問(wèn)題,本研究采用泡沫混凝土和硅鈣板進(jìn)行復(fù)合,開(kāi)發(fā)具有保溫、防火等功能的泡沫混凝土復(fù)合墻板,圍繞泡沫混凝土復(fù)合墻板在制備過(guò)程的泡沫混凝土粉化問(wèn)題,泡沫混凝土與硅鈣板的粘結(jié)問(wèn)題,泡沫混凝土及硅鈣板的不一致干燥收縮導(dǎo)致開(kāi)裂問(wèn)題等關(guān)鍵問(wèn)題展開(kāi)研究,主要的內(nèi)容包括:首先,采用外觀比較和鉛筆硬度法測(cè)試了不同泡沫混凝土的粉化程度,通過(guò)研究不同容重泡沫混凝土水化產(chǎn)物的組成,探討超輕泡沫混凝土粉化的機(jī)理,進(jìn)而提出改善泡沫混凝土的粉化現(xiàn)象的措施。結(jié)果表明:泡沫混凝土早期快速失水是導(dǎo)致其粉化的主要原因,水分快速蒸發(fā)延緩下一步水化,使水化產(chǎn)物含量降低,難以形成良好的凝膠結(jié)構(gòu),致使部分粉體顆粒容易脫落,形成粉化。泡沫混凝土容重越低,早期失水率越高,粉化越嚴(yán)重,300kg/m3的泡沫混凝土成型初始1d失水率超過(guò)40%;加強(qiáng)早期養(yǎng)護(hù)、提高水灰比或摻入保水劑,可降低泡沫混凝土的粉化程度。其次,探索了泡沫混凝土的容重、水灰比、乳膠粉摻量及硅鈣板的不同處理方式等因素對(duì)復(fù)合板粘結(jié)強(qiáng)度的影響。結(jié)果表明:乳膠粉可以明顯提高泡沫混凝土對(duì)硅鈣板的粘結(jié)強(qiáng)度,以500kg/m3泡沫混凝土為例,相對(duì)于不摻乳膠粉的泡沫混凝土,當(dāng)乳膠粉摻量為1%時(shí),其壓剪粘結(jié)強(qiáng)度從178k Pa增加到280k Pa;硅鈣板吸收泡沫混凝土漿體中的水,可以提高復(fù)合板的粘結(jié)強(qiáng)度,但是硅鈣板吸水會(huì)造成泡沫混凝土消泡塌模。當(dāng)用相對(duì)含水率為50%的硅鈣板制備復(fù)合板時(shí),可以保證復(fù)合板具有較高的粘結(jié)強(qiáng)度,同時(shí)復(fù)合板具有較低的塌模程度。增稠劑可以提高復(fù)合板中泡沫混凝土的澆注穩(wěn)定性,同時(shí)保證復(fù)合板具有較高的粘結(jié)強(qiáng)度。最后,對(duì)復(fù)合板干燥收縮行為進(jìn)行了有限元模擬分析,獲得復(fù)合板內(nèi)部應(yīng)力分布情況。對(duì)比了乳膠粉、細(xì)河砂和聚丙烯纖維對(duì)泡沫混凝土的力學(xué)性能、干燥收縮和開(kāi)裂性能的影響。結(jié)果表明:聚丙烯纖維的摻入顯著地提高了泡沫混凝土的韌性,同時(shí)也降低了泡沫混凝土的干燥收縮,摻入細(xì)河砂和聚丙烯纖維可將500kg/m3泡沫混凝土干縮值降低至3750×10-6,減輕了泡沫混凝土的開(kāi)裂程度,纖維是抑制泡沫混凝土開(kāi)裂的關(guān)鍵因素。以容重為500kg/m3的泡沫混凝土制備復(fù)合板,采用聚丙烯纖維對(duì)泡沫混凝土進(jìn)行增韌阻裂,可以提高復(fù)合板的抗裂能力,保證復(fù)合板結(jié)構(gòu)的完整性。
[Abstract]:In order to meet the requirements of energy saving, fire prevention and environmental protection in modern buildings, inorganic thermal insulation materials with relative advantages have become an important direction in the development of energy saving materials of modern buildings. Among them, foam concrete has the advantages of light weight, heat insulation, sound insulation, non-combustion and seismic resistance, which can meet the requirements of building energy conservation and improve building safety. It has become a hot spot in the research of modern building energy conservation. However, its low strength, easy pulverization and large drying shrinkage restrict its application in the field of wall materials. In order to solve these problems, the foam concrete composite wall board with thermal insulation and fire resistance was developed. The key problems such as the powdering of foamed concrete, the bonding between foamed concrete and calcium silicate slab, and the cracking caused by inconsistent drying shrinkage of foamed concrete and calcium silicate slab are studied. The main contents are as follows: firstly, the powdering degree of different foam concrete is tested by using appearance comparison and pencil hardness method, and the mechanism of ultralight foam concrete powdering is discussed by studying the composition of hydration products of foam concrete with different bulk density. Furthermore, the measures to improve the powdering phenomenon of foamed concrete are put forward. The results show that the rapid water loss in the early stage of foamed concrete is the main cause of its pulverization. The rapid evaporation of water slows down the hydration in the next step, reduces the content of hydration products, and makes it difficult to form a good gel structure, which causes some powder particles to fall off easily. Form a powder. The lower the bulk density of foamed concrete is, the higher the rate of water loss in the early stage is, and the more serious the pulverization of foamed concrete is, the more serious the water loss rate of foamed concrete is 300 kg / m ~ 3 in the first day, the water loss rate of foamed concrete is more than 40% at the beginning of forming. Secondly, the effects of bulk density, water / cement ratio, latex powder content and different treatment methods of calcium silicate plate on the bond strength of composite concrete were explored. The results show that the adhesive strength of foam concrete to calcium silicate slab can be improved obviously by latex powder. Taking 500kg/m3 foam concrete as an example, compared with foam concrete without latex powder, when the amount of latex powder is 1%, The compressive shear bond strength is increased from 178kPa to 280kPa.The silica calcium plate absorbs water from the foam concrete paste, which can improve the bond strength of the composite slab. When the composite plate with 50% relative moisture content is used to prepare the composite plate, it can ensure that the composite plate has higher bond strength and lower collapsing degree. The thickening agent can improve the pouring stability of foam concrete in the composite slab and ensure the high bond strength of the composite slab. Finally, the drying shrinkage behavior of composite plate is simulated by finite element method, and the stress distribution inside the composite plate is obtained. The effects of latex powder, fine river sand and polypropylene fiber on the mechanical properties, drying shrinkage and cracking properties of foamed concrete were compared. The results showed that the toughness of foamed concrete was significantly improved by adding polypropylene fiber, and the drying shrinkage of foamed concrete was also reduced. The dry shrinkage value of 500kg/m3 foam concrete can be reduced to 3750 脳 10 ~ (-6) by adding fine river sand and polypropylene fiber, and the crack degree of foam concrete can be alleviated. Fiber is the key factor to restrain the crack of foam concrete. The composite slab made of 500kg/m3 foam concrete and toughened and cracked by polypropylene fiber can improve the crack resistance of the composite slab and ensure the integrity of the composite slab structure.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528.7

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 喬歡歡;盧忠遠(yuǎn);嚴(yán)云;舒朗;;摻合料粉體種類對(duì)泡沫混凝土性能的影響[J];中國(guó)粉體技術(shù);2008年06期

2 歐陽(yáng)東;易超;;硅鈣板-聚苯乙烯輕質(zhì)混凝土實(shí)心復(fù)合墻板的發(fā)展[J];廣東建材;2013年01期

3 胡曙光;關(guān)凌岳;王發(fā)洲;楊露;齊廣華;張旭龍;;泡間水對(duì)泡沫混凝土抗壓強(qiáng)度影響規(guī)律研究[J];功能材料;2013年S2期

4 陳兵;劉睫;;纖維增強(qiáng)泡沫混凝土性能試驗(yàn)研究[J];建筑材料學(xué)報(bào);2010年03期

5 李翔宇;趙霄龍;郭向勇;曹力強(qiáng);;泡沫混凝土導(dǎo)熱系數(shù)模型研究[J];建筑科學(xué);2010年09期

6 鐘榕;王中平;;泡沫混凝土含氣量-力學(xué)性能的數(shù)學(xué)關(guān)系分析[J];混凝土;2012年10期

7 李應(yīng)權(quán);朱立德;李菊麗;扈士凱;段策;王笑帆;;泡沫混凝土配合比的設(shè)計(jì)[J];徐州工程學(xué)院學(xué)報(bào)(自然科學(xué)版);2011年02期

8 扈士凱;李應(yīng)權(quán);段策;羅寧;;礦物摻和料對(duì)泡沫混凝土基本性能的影響[J];墻材革新與建筑節(jié)能;2009年11期

9 楊康;王德玲;喻成成;李書(shū)磊;王賢根;;摻入稻殼灰的泡沫混凝土及其發(fā)展分析[J];四川建材;2014年03期

10 鄭念念;何真;孫海燕;王寬;童明德;;大摻量粉煤灰泡沫混凝土的性能研究[J];武漢理工大學(xué)學(xué)報(bào);2009年07期

相關(guān)博士學(xué)位論文 前1條

1 李從波;承重保溫夾芯無(wú)拉接件的復(fù)合墻體的研究[D];華南理工大學(xué);2013年

相關(guān)碩士學(xué)位論文 前5條

1 申繪芳;復(fù)合自保溫混凝土砌塊砌體的試驗(yàn)研究[D];浙江工業(yè)大學(xué);2010年

2 丁曼;防水性泡沫混凝土研究[D];湖南大學(xué);2011年

3 楊奉源;泡沫混凝土性能的影響因素研究[D];西南科技大學(xué);2012年

4 伊?xí)x宏;鐵尾礦粉泡沫混凝土的制備及其性能的研究[D];吉林建筑工程學(xué)院;2011年

5 石川;泡沫混凝土及其復(fù)合墻板的研究[D];華南理工大學(xué);2013年

，

本文編號(hào)：1970486