废旧塑料骨料对砂浆性能影响
发布时间：2018-12-17 21:18
【摘要】：由于塑料制品的制备工艺越来越成熟,使得塑料的应用领域越来越广泛。与此同时产生的废旧塑料也与日俱增,且对环境造成的污染十分严重,甚至对人类的健康生活产生了不可忽视的威胁。因此越来越多的人们开始关注废旧塑料的处理。塑料有很强的韧性,理论上塑料加入脆性的混凝土中可以改善混凝土的韧性,增加其抗震性,同时塑料质轻,塑料的加入可以有效地降低混凝土的表观密度等。因此研究塑料骨料对混凝土性能的影响是一项很有前景的项目,它有助于改善混凝土本身存在的不足,同时还可以为处理大量废旧塑料寻找出一条新的途径。本文以废旧PVC电缆皮为塑料骨料原材料,经破碎后部分与水泥粉混合再经双螺旋挤出机重新造粒,制得新骨料(在以后论文中没有特殊说明时骨料专指制备的新骨料),采用内掺等体积取代法用骨料取代砂浆中的砂制备塑料砂浆。以下几个方面为本文研究的重点:1.用制备出的塑料骨料作为对象研究其属性(表观密度,接触角,弹性模量等)与水泥含量的关系,实验发现随着水泥含量的增加,骨料的接触角变小,表观密度,弹性模量增加;2.将制得的骨料添加到砂浆中,研究不同含量的骨料对砂浆流动性、表观密度、抗折抗压强度、极限挠度、骨料分布的影响。实验发现:当骨料含量相等时,随着骨料中水泥含量的增加,砂浆的抗折抗压强度、极限挠度与骨料在砂浆中分布的均匀度变大;3.研究不同骨料含量对砂浆导热性能的影响,并建立并联串联模型,假设并联因子与串联因子,导出理论导热系数与骨料含量的关系。实验发现砂浆试样的导热系数随着骨料的增加而减小,理论并联导热系数大于串联导热系数;4.以孔径均匀性指标α与孔径均值r为参数研究不同温度下不同骨料含量对砂浆孔结构的影响及其对砂浆抗硫酸盐性能的影响,在200℃条件下随着骨料含量的增加,α变大,r减小,经热处理后砂浆抗硫酸盐的侵蚀能力得到增强。
[Abstract]:As the preparation technology of plastic products becomes more and more mature, the application field of plastics becomes more and more extensive. At the same time, the waste plastics are increasingly produced, and the pollution to the environment is very serious, even to the health of human life has produced a threat that can not be ignored. Therefore, more and more people begin to pay attention to the treatment of waste plastics. Plastic has a strong toughness. In theory, adding plastic to brittle concrete can improve the toughness of concrete and increase its seismic resistance. At the same time, the plastic is light, and the addition of plastic can effectively reduce the apparent density of concrete. Therefore, it is a promising project to study the influence of plastic aggregate on concrete performance, which is helpful to improve the shortcomings of concrete itself, and to find a new way to deal with a large number of waste plastics at the same time. In this paper, the waste PVC cable skin is used as the raw material of plastic aggregate, after crushing part is mixed with cement powder and then granulated by double helix extruder, the new aggregate is prepared (when there is no special explanation in the later paper, the new aggregate is specially prepared). The plastic mortar was prepared by replacing the sand in the mortar with aggregate by the method of equal volume substitution. The following aspects are the focus of this study: 1. The relationship between the properties (apparent density, contact angle, elastic modulus, etc.) and the cement content was studied by using the prepared plastic aggregate as the object. It was found that the contact angle and apparent density of the aggregate decreased with the increase of cement content. The elastic modulus increases; 2. The effects of different contents of aggregate on the flowability, apparent density, flexural strength, ultimate deflection and aggregate distribution of the mortar were studied. It is found that when the aggregate content is equal, with the increase of cement content in aggregate, the flexural strength, ultimate deflection and uniformity of aggregate distribution in mortar become larger; 3. The influence of different aggregate content on the thermal conductivity of mortar was studied, and a parallel series model was established. The relationship between theoretical thermal conductivity and aggregate content was deduced by assuming the parallel factor and series factor. It is found that the thermal conductivity of mortar samples decreases with the increase of aggregate, and the theoretical parallel thermal conductivity is larger than that of series. 4. The effect of different aggregate content on the pore structure of mortar at different temperatures and its effect on the sulphate resistance of mortar were studied by using the pore size uniformity index 伪 and the mean pore diameter r as parameters. At 200 鈩，
本文编号：2384810
[Abstract]:As the preparation technology of plastic products becomes more and more mature, the application field of plastics becomes more and more extensive. At the same time, the waste plastics are increasingly produced, and the pollution to the environment is very serious, even to the health of human life has produced a threat that can not be ignored. Therefore, more and more people begin to pay attention to the treatment of waste plastics. Plastic has a strong toughness. In theory, adding plastic to brittle concrete can improve the toughness of concrete and increase its seismic resistance. At the same time, the plastic is light, and the addition of plastic can effectively reduce the apparent density of concrete. Therefore, it is a promising project to study the influence of plastic aggregate on concrete performance, which is helpful to improve the shortcomings of concrete itself, and to find a new way to deal with a large number of waste plastics at the same time. In this paper, the waste PVC cable skin is used as the raw material of plastic aggregate, after crushing part is mixed with cement powder and then granulated by double helix extruder, the new aggregate is prepared (when there is no special explanation in the later paper, the new aggregate is specially prepared). The plastic mortar was prepared by replacing the sand in the mortar with aggregate by the method of equal volume substitution. The following aspects are the focus of this study: 1. The relationship between the properties (apparent density, contact angle, elastic modulus, etc.) and the cement content was studied by using the prepared plastic aggregate as the object. It was found that the contact angle and apparent density of the aggregate decreased with the increase of cement content. The elastic modulus increases; 2. The effects of different contents of aggregate on the flowability, apparent density, flexural strength, ultimate deflection and aggregate distribution of the mortar were studied. It is found that when the aggregate content is equal, with the increase of cement content in aggregate, the flexural strength, ultimate deflection and uniformity of aggregate distribution in mortar become larger; 3. The influence of different aggregate content on the thermal conductivity of mortar was studied, and a parallel series model was established. The relationship between theoretical thermal conductivity and aggregate content was deduced by assuming the parallel factor and series factor. It is found that the thermal conductivity of mortar samples decreases with the increase of aggregate, and the theoretical parallel thermal conductivity is larger than that of series. 4. The effect of different aggregate content on the pore structure of mortar at different temperatures and its effect on the sulphate resistance of mortar were studied by using the pore size uniformity index 伪 and the mean pore diameter r as parameters. At 200 鈩，
本文编号：2384810
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