本文關(guān)鍵詞：蒸壓加氣混凝土砌塊的抗凍性研究　出處：《長(zhǎng)沙理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 毛細(xì)吸水系數(shù) 孔結(jié)構(gòu) 抗凍性指標(biāo) 耐久性 抗凍性 蒸壓加氣混凝土 強(qiáng)度

【摘要】：隨著國(guó)家可持續(xù)發(fā)展戰(zhàn)略的實(shí)施,滿足“節(jié)能、節(jié)土、節(jié)水、利廢”要求的綠色墻體材料將取代傳統(tǒng)墻體材料。蒸壓加氣混凝土具有質(zhì)量輕、保溫隔熱性能好的特點(diǎn),并能消耗大量的廢棄粉煤灰,目前已成為我國(guó)主要的填充墻墻體材料之一。耐久性是填充墻非常重要的性能指標(biāo)。目前,對(duì)蒸壓加氣混凝土耐久性尤其是抗凍性方面的研究還非常少。為了進(jìn)一步完善蒸壓加氣混凝土抗凍性方面的研究,本文進(jìn)行了一系列試驗(yàn)與理論分析,對(duì)綠色節(jié)能材料的應(yīng)用與推廣具有重大意義。研究和分析表明,材料的孔結(jié)構(gòu)和其本身的物理力學(xué)性能是影響抗凍性的主要因素,而毛細(xì)吸水系數(shù)能夠較好的反映孔結(jié)構(gòu)的基本情況。本文在研究加氣混凝土材料吸水特性與孔結(jié)構(gòu)的關(guān)系時(shí)引用了吸水動(dòng)力學(xué)的基本原理,并通過4組24塊試件的吸水試驗(yàn)后,得到了吸水曲線圖,建立了孔結(jié)構(gòu)與毛細(xì)吸水系數(shù)之間的關(guān)系。研究表明,加氣混凝土的孔徑大小對(duì)抗凍性有很大影響,孔徑很大以及孔徑很小的孔對(duì)加氣混凝土抗凍性影響很小。通過吸水動(dòng)力學(xué)理論研究和試驗(yàn)分析,計(jì)算出不同吸水時(shí)間段內(nèi)毛細(xì)孔的平均孔徑,得到了對(duì)加氣混凝土抗凍性的影響起主要作用的毛細(xì)吸水系數(shù)。通過對(duì)4組80塊不同材料進(jìn)行凍融循環(huán)試驗(yàn),提出了以毛細(xì)吸水系數(shù)、無孔隙強(qiáng)度為主要參數(shù)來表征其抗凍性的方法。同時(shí),基于這一方法提出了加氣混凝土抗凍性指標(biāo),并根據(jù)不同地區(qū)抗凍等級(jí)的要求,得到不同地區(qū)的抗凍性指標(biāo)和最低強(qiáng)度等級(jí)的限值。
[Abstract]:With the implementation of the national sustainable development strategy, green wall materials which meet the requirements of "energy saving, soil saving, water saving and waste benefit" will replace the traditional wall materials. The autoclaved aerated concrete has light quality. Heat preservation and heat insulation, and can consume a large number of waste fly ash, has become one of the main wall materials in China. Durability is a very important performance index of filled wall. The research on the durability of autoclaved aerated concrete, especially on its frost resistance, is very few. In order to further improve the research on the frost resistance of autoclaved aerated concrete, a series of experiments and theoretical analysis have been carried out in this paper. The research and analysis show that the pore structure of the material and its physical and mechanical properties are the main factors affecting the frost resistance. The capillary water absorption coefficient can better reflect the basic situation of the pore structure. In this paper, the basic principle of water absorption dynamics is cited in the study of the relationship between the water absorption characteristics of aerated concrete materials and the pore structure. The relationship between pore structure and capillary water absorption coefficient was established through the water absorption tests of 24 specimens in 4 groups. The results show that the pore size of aerated concrete has a great influence on the frost resistance. The effect of large pore size and small pore size on the freezing resistance of aerated concrete is very small. Through the theoretical research and experimental analysis of water absorption dynamics, the average pore size of capillary in different water absorption periods is calculated. The capillary water absorption coefficient which plays an important role in the frost resistance of aerated concrete is obtained. Through freeze-thaw cycle test of 80 different materials in 4 groups, the capillary water absorption coefficient is put forward. At the same time, based on this method, the frost resistance index of aerated concrete is put forward, and according to the requirements of different regions, the frost resistance of aerated concrete is studied. The freezing resistance index and the limit value of the lowest strength grade were obtained in different regions.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU522.3

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本文編號(hào)：1398420