废弃玻璃在水泥砂浆中的应用研究

发布时间：2018-06-16 11:20

本文选题：废弃玻璃粉 + 废弃玻璃砂　；参考：《青岛理工大学》2016年硕士论文

【摘要】：随着世界工业化的进程,固体废弃物的消耗量呈现逐年递增的趋势,其中废弃玻璃的消耗量占全球固体废弃物消耗量的7%。把废弃玻璃作为矿物掺合料参与生产水泥砂浆,其力学性能、高温下的体积稳定性以及废弃玻璃中SiO_2的活性含量都直接影响废弃玻璃水泥砂浆的预期工作性能。为此,本文通过试验系统研究了废弃玻璃粉、玻璃砂水泥砂浆的配合比设计、基本物理力学性能、高温下的体积稳定性能、废弃玻璃粉中活性SiO_2的含量,为废弃玻璃在混凝土中的循环使用和进一步优化提供试验与理论依据。研究的主要结论如下:1.废弃玻璃粉取代部分水泥制成水泥砂浆,随着废弃玻璃粉掺量的增加,水泥砂浆试件的抗压强度先增大后降低。正交试验结果显示:玻璃粉掺量为10%、水胶比为0.4、胶凝总量为450kg/m~3时废弃玻璃粉水泥砂浆试件的抗压强度达到最大值。对废弃玻璃粉水泥砂浆试件进行极差、方差分析显示:影响抗压强度最显著的为玻璃粉掺量,其次为水胶比,而胶凝总量和玻璃粉的颜色对强度的影响很小。2.随着养护龄期的延长,废弃玻璃粉水泥砂浆试件的抗压强度增大,前28d抗压强度增长较快,28d后抗压强度增长逐渐变缓,说明废弃玻璃粉具有一定的活性、具有提高试件早期强度的特点。3.由热重实验结果可见:随着温度上升,在120-150摄氏度区间分解废弃玻璃粉水泥砂浆试件样品中的水分、在440-460摄氏度区间分解Ca(OH)_2、在700-730摄氏度区间分解CaCO_3;随着养护龄期的延长,掺加废弃玻璃粉的试件样品中Ca(OH)_2分解量有降低的趋势,说明玻璃粉中的活性SiO_2会消耗掉一部分水泥水化产物Ca(OH)_2形成水化硅酸钙,从而热重图示中的Ca(OH)_2分解量降低。4.废弃玻璃粉取代部分水泥、废弃玻璃砂取代部分标准砂分别制成水泥砂浆试块件,80度水浴条件下研究玻璃组分中的活性SiO_2与砂浆中的碱是否存在潜在的碱-硅酸反应破坏。结果表明:在14d的标准养护条件下所有试件膨胀率均低于0.1%,所有试样均无开裂、变形、表面无胶状物渗出,证明不存在潜在的碱-硅酸膨胀破坏,;当80度水浴养护到56d后掺加30%的玻璃砂砂浆试块的膨胀率大于0.2%,可能存在潜在的碱-硅酸反应膨胀破坏的危害;通过SEM电镜扫描显示绿色玻璃表面平滑,白色玻璃表面空隙较多,证明白色玻璃试件相较于绿色玻璃试件更容易发生碱-硅酸反应膨胀破坏。5.废弃玻璃粉中活性SiO_2的活性率Ka随着玻璃颗粒在球磨机中的研磨时间发生变化:研磨时间越长,粒度越细,玻璃粉中SiO_2活性率Ka也越高,研磨2h后玻璃粉中SiO_2活性率Ka增长缓慢,并逐渐趋于稳定;通过活性指数法研究绿色、白色、棕色三种玻璃粉水泥胶砂试件对砂浆强度的影响,养护7d后的三种颜色玻璃粉水泥胶砂的活性指数大小为分别为45.3%,28.9%,57.1%,养护28d后的三种颜色玻璃粉水泥胶砂的活性指数大小为分别为60.2%,43.6%,60.95%,证明三种颜色玻璃粉的活性大小为:棕色绿色白色。
[Abstract]:With the process of industrialization in the world, the consumption of solid waste is increasing year by year, in which waste glass is consumed by 7%. in the global solid waste consumption. Waste glass is used as mineral admixture to produce cement mortar. The mechanical properties, bulk stability at high temperature and the active content of SiO_2 in waste glass In this paper, the mixing ratio design of waste glass powder and glass sand cement mortar, the basic physical and mechanical properties, the volume stability at high temperature, the content of the active SiO_2 in the waste glass powder and the circulation of the waste glass in the concrete are studied by the test system. The main conclusions are as follows: 1. the main conclusions are as follows: the cement mortar is replaced by some waste glass powder. With the increase of the amount of waste glass powder, the compressive strength of the cement mortar increases first and then decreases. The orthogonal test results show that the content of glass powder is 10%, the ratio of water to glue is 0.4, and the aggregate amount is 4. The compressive strength of the abandoned glass cement mortar specimens reached the maximum at 50kg/m~3. The variance analysis showed that the most significant influence of the compressive strength was the amount of glass powder, followed by the water glue ratio, while the effect of the gross gelation amount and the color of glass powder on the strength was very small.2. along with the maintenance age. The compressive strength of the abandoned glass cement mortar specimens increases, the compressive strength of the former 28d increases rapidly, and the compressive strength increases gradually after 28d, which indicates that the waste glass powder has a certain activity and has the characteristic of improving the early strength of the specimen..3. is seen from the thermogravimetric experimental results: with the temperature rising, the discarded glassy is decomposed in the range of 120-150 degrees Celsius. The moisture content in the sample of glazing cement mortar is Ca (OH) _2 in the interval of 440-460 degrees Celsius, and CaCO_3 is decomposed at 700-730 degrees Celsius. With the prolongation of the curing age, the decomposition of Ca (OH) _2 in the samples with waste glass powder is reduced, indicating that the active SiO_2 in the glass powder will consume a part of the cement hydration product Ca (O). H) _2 formed a hydrated calcium silicate, thus the decomposition of Ca (OH) _2 in the thermogravimetric diagram was reduced by.4. waste glass powder instead of partial cement. The waste glass sand was replaced by some standard sand instead of a part of the cement mortar. The potential alkali silica reaction damage in the active SiO_2 in the glass component and the alkali in the slurry was studied under the condition of 80 degree water bath. The results show that the expansion rate of all the specimens under the standard curing condition of 14d is less than 0.1%. All the samples have no cracking, deformation, and no glue oozing on the surface. It proves that there is no potential alkali silicic acid expansion damage. When the 80 degree water bath curing to 56d, the expansion ratio of 30% glass sand mortar is more than 0.2%, and there may be potential alkali silica acid. The damage caused by expansion and destruction, the SEM scanning electron microscope shows that the surface of green glass is smooth and the white glass surface is more void. It is proved that the white glass specimen is more prone to alkali silicic acid reaction expansion to destroy the active SiO_2 in the.5. waste glass powder than the green glass specimen, and with the grinding time of the glass particles in the ball mill. Change: the longer the grinding time, the finer the granularity, the higher the SiO_2 activity in the glass powder, the higher the Ka activity of the glass powder, the SiO_2 activity rate Ka in the glass powder after 2H grinding is slow, and gradually tends to be stable. The effect of green, white and brown three kinds of glass powder cement mortar on the strength of the mortar is studied by the active index method, and the three kinds of glass powder after 7d are cured. The active index of cement mortar is 45.3%, 28.9%, 57.1%. The activity index of three kinds of glass powder cement mortar after curing 28d is 60.2%, 43.6%, 60.95% respectively. It is proved that the activity size of the three kinds of color glass powder is: brown green white.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ177.62

【参考文献】