人工合成发泡剂的制备及其对泡沫混凝土的影响评价
发布时间：2018-08-07 14:25
【摘要】：本文的目的是设计一种含有有机溶剂及合成表面活性剂的发泡剂,并研究其在砂浆中的性能。此种发泡剂和减水剂、不同掺量的偏高岭土、纳米二氧化钛一起被用于制备高密度泡沫混凝土(密度大于1600kg/m3),同时在不同养护条件下研究了该泡沫混凝土的性能如吸水率、抗压强度等。发泡剂基于一种含有疏水及亲水性基团的两亲性有机化合物的合成表面活性剂合成,表面活性剂的主要目的是降低水的表面张力,从而使得高速压缩空气和起泡剂溶液在高密度区域混合情况下更容易产生这种发泡剂由月桂醇硫酸酯钠盐、乙醇、十二醇和水合成,在水和空气稀释下其会产生稳定的泡沫,本文研究了泡沫的一些性能如稀释比例、密度、工作能力和排水能力。用机械方法将泡沫引入到砂浆中制备泡沫混凝土,研究了混凝土的密度稳定性、抗压强度和吸水性。测试结果表明,在最佳稀释比例1:40的条件下泡沫的初密度为104 kg/m3,混凝土的密度从450kg/m3至1950kg/m3不等,其抗压强度在0.5-23Mpa间变化。同Eabassoc发泡剂相比,此种发泡剂制备泡沫的加入使得泡沫混凝土的28d强度更高。根据ASTM 869-91,该化学成分比例可用于制备合格的发泡剂。在证实了发泡剂的合格性后,用该发泡剂制备的泡沫和不同掺量的偏高岭土及纳米二氧化钛来制备高密度泡沫混凝土(密度大于1600kg/m3),并研究了养护条件对其抗压强度和吸水性的影响。试样分别在室温25±2oC下空气中养护、25±2oC下浸水养护、80±2oC的烘箱中养护及80±2oC下蒸养,偏高岭土掺量分别%,10%和15%,纳米二氧化钛掺量分别1,2,3,4,5%。通过实验来探究养护条件、偏高岭土、纳米二氧化钛及偏高岭土和纳米二氧化钛复合对混凝土吸水性和抗压强度的影响。比较只掺纳米二氧化钛(C2)和未掺纳米二氧化钛和偏高岭土(C1)的试样,试验结果表明相比于其它养护条件如高温养护、蒸养、空气中养护、浸水养护,水养条件下C1及C2的3d强度最高。相较于C1,只掺有纳米二氧化钛的试样C2的吸水性及强度最低。未掺纳米二氧化钛及偏高岭土的试样C1的28d强度高于掺有3%纳米二氧化钛的试样C2。C3,C4,C5分别只掺有5%,10%,15%的偏高岭土。比较C3,C4,C5试样的试验结果,试样28d强度最高的偏高岭土最佳掺量为10%,特别是水中养护的试样。水养3d试样的吸水性随着偏高岭土掺量的增加而增加。试样C6,C7,C8,C9,C10复掺有偏高岭土和纳米二氧化钛,其中偏高岭土的掺量固定为10%,纳米二氧化钛的掺量分别为1%,2%,3%,4%,5%。试验结果显示,能使得试样28d强度最高的最佳掺量为10%偏高岭土和3%纳米二氧化钛。所有的试样水养条件下的强度最高,蒸养条件下的强度次之,高温养护条件下的强度最低。试验结果也指出,随着强度的增加试样的吸水率也随之增加,其中高温养护条件下试样的吸水率最低,蒸养条件下试样的吸水率次之,水养条件下试样的吸水率最大。
[Abstract]:The purpose of this paper is to design a foaming agent containing organic solvents and synthetic surfactants and to study its properties in mortar. This kind of foaming agent, water reducing agent, different amount of metakaolin, nanometer titanium dioxide are used to prepare high density foam concrete (density greater than 1600kg/m3) together. At the same time, the properties of the foam concrete such as water absorption are studied under different curing conditions. Compressive strength, etc. The foaming agent is based on the synthesis of an amphiphilic organic compound containing hydrophobic and hydrophilic groups, the main purpose of which is to reduce the surface tension of water. This makes it easier to produce this foaming agent from sodium lauryl sulfate, ethanol, dodecanol and water when the high speed compressed air and foaming agent solution is mixed in a high density region, and when diluted with water and air, it produces a stable foam. Some properties of foam, such as dilution ratio, density, working capacity and drainage capacity, are studied in this paper. Foam concrete was prepared by mechanical method. The density stability, compressive strength and water absorption of concrete were studied. The results show that the initial density of foam is 104kg / m ~ (3) and the density of concrete varies from 450kg/m3 to 1950kg/m3 under the optimum dilution ratio of 1:40, and the compressive strength of concrete varies between 0.5-23Mpa. Compared with Eabassoc foaming agent, the addition of foaming agent makes the strength of foamed concrete for 28 days higher. According to ASTM 869-91, the chemical composition ratio can be used to prepare qualified foaming agent. After confirming the eligibility of the foaming agent, High density foam concrete (density > 1600kg/m3) was prepared by using foaming agent, metakaolin and nano-TiO _ 2. The influence of curing conditions on its compressive strength and water absorption was studied. The samples were cured at room temperature 25 卤2oC in air and 80 卤2oC in the oven immersed in water under 25 卤2oC and steamed under 80 卤2oC respectively. The content of metakaolin was 10% and 15%, respectively, and the content of nanometer titanium dioxide was 1 ~ 2 ~ 3 ~ 3 ~ 4 ~ 5 ~ 5, respectively. The effects of the curing conditions of metakaolin, nano titanium dioxide and the composite of metakaolin and nano titanium dioxide on the water absorption and compressive strength of concrete were investigated. The test results show that compared to other curing conditions such as high temperature curing, steam curing, air curing and soaking curing, the samples with only nano-TiO _ 2 (C2) and undoped nano-TiO _ 2 and metakaolin (C1) are compared. The 3D strength of C _ 1 and C _ 2 was the highest under hydrotrophic conditions. Compared with C _ 1, C _ 2 with nano TIO _ 2 only had the lowest water absorption and strength. The 28d strength of C _ 1 without nano-TiO _ 2 and metakaolin is higher than that of C _ 2. C _ 3 / C _ (4) C _ (5) with 3% nanometer TIO _ 2. Only 510% of metakaolin is mixed with C _ (2) C _ (3) C _ (3) C _ (4) C _ (5). Compared with the test results of C3C4C5 specimen, the best content of metakaolin, which has the highest strength in 28 days, is 10%, especially the sample cured in water. The water absorption increased with the increase of the content of metakaolin. Sample C _ 6C _ (7) C _ (7) C _ (8) C _ (9) C _ (9) C _ (10) was mixed with metakaolin and nanometer titanium dioxide. The experimental results show that the optimum content of 10% metakaolin and 3% nano-TiO _ 2 can make the maximum 28d strength of the sample. The strength of all the samples was the highest under the condition of water culture, followed by the strength under the condition of steaming, and the lowest under the condition of high temperature curing. The experimental results also show that the water absorption rate of the sample increases with the increase of strength. The water absorption rate of the sample under high temperature curing condition is the lowest, the water absorption rate of the sample under the condition of evapotranspiration is the second, and the water absorption rate of the sample under the condition of water conservation is the largest.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.2;TQ423.9
本文编号：2170311
[Abstract]:The purpose of this paper is to design a foaming agent containing organic solvents and synthetic surfactants and to study its properties in mortar. This kind of foaming agent, water reducing agent, different amount of metakaolin, nanometer titanium dioxide are used to prepare high density foam concrete (density greater than 1600kg/m3) together. At the same time, the properties of the foam concrete such as water absorption are studied under different curing conditions. Compressive strength, etc. The foaming agent is based on the synthesis of an amphiphilic organic compound containing hydrophobic and hydrophilic groups, the main purpose of which is to reduce the surface tension of water. This makes it easier to produce this foaming agent from sodium lauryl sulfate, ethanol, dodecanol and water when the high speed compressed air and foaming agent solution is mixed in a high density region, and when diluted with water and air, it produces a stable foam. Some properties of foam, such as dilution ratio, density, working capacity and drainage capacity, are studied in this paper. Foam concrete was prepared by mechanical method. The density stability, compressive strength and water absorption of concrete were studied. The results show that the initial density of foam is 104kg / m ~ (3) and the density of concrete varies from 450kg/m3 to 1950kg/m3 under the optimum dilution ratio of 1:40, and the compressive strength of concrete varies between 0.5-23Mpa. Compared with Eabassoc foaming agent, the addition of foaming agent makes the strength of foamed concrete for 28 days higher. According to ASTM 869-91, the chemical composition ratio can be used to prepare qualified foaming agent. After confirming the eligibility of the foaming agent, High density foam concrete (density > 1600kg/m3) was prepared by using foaming agent, metakaolin and nano-TiO _ 2. The influence of curing conditions on its compressive strength and water absorption was studied. The samples were cured at room temperature 25 卤2oC in air and 80 卤2oC in the oven immersed in water under 25 卤2oC and steamed under 80 卤2oC respectively. The content of metakaolin was 10% and 15%, respectively, and the content of nanometer titanium dioxide was 1 ~ 2 ~ 3 ~ 3 ~ 4 ~ 5 ~ 5, respectively. The effects of the curing conditions of metakaolin, nano titanium dioxide and the composite of metakaolin and nano titanium dioxide on the water absorption and compressive strength of concrete were investigated. The test results show that compared to other curing conditions such as high temperature curing, steam curing, air curing and soaking curing, the samples with only nano-TiO _ 2 (C2) and undoped nano-TiO _ 2 and metakaolin (C1) are compared. The 3D strength of C _ 1 and C _ 2 was the highest under hydrotrophic conditions. Compared with C _ 1, C _ 2 with nano TIO _ 2 only had the lowest water absorption and strength. The 28d strength of C _ 1 without nano-TiO _ 2 and metakaolin is higher than that of C _ 2. C _ 3 / C _ (4) C _ (5) with 3% nanometer TIO _ 2. Only 510% of metakaolin is mixed with C _ (2) C _ (3) C _ (3) C _ (4) C _ (5). Compared with the test results of C3C4C5 specimen, the best content of metakaolin, which has the highest strength in 28 days, is 10%, especially the sample cured in water. The water absorption increased with the increase of the content of metakaolin. Sample C _ 6C _ (7) C _ (7) C _ (8) C _ (9) C _ (9) C _ (10) was mixed with metakaolin and nanometer titanium dioxide. The experimental results show that the optimum content of 10% metakaolin and 3% nano-TiO _ 2 can make the maximum 28d strength of the sample. The strength of all the samples was the highest under the condition of water culture, followed by the strength under the condition of steaming, and the lowest under the condition of high temperature curing. The experimental results also show that the water absorption rate of the sample increases with the increase of strength. The water absorption rate of the sample under high temperature curing condition is the lowest, the water absorption rate of the sample under the condition of evapotranspiration is the second, and the water absorption rate of the sample under the condition of water conservation is the largest.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.2;TQ423.9
【参考文献】
相关期刊论文 前1条
1 Harun TANYILDIZI;;温度、炭纤维和硅土粉对轻量混凝土力学性能的影响(英文)[J];新型炭材料;2008年04期
，本文编号：2170311
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