矿物掺合料对玻化微珠保温材料性能的影响

发布时间：2018-06-27 10:43

本文选题：玻化微珠 + 矿物掺合料　；参考：《重庆大学》2015年硕士论文

【摘要】：膨胀玻化微珠通常为表面玻化封闭,内部为空腔结构的无机轻质材料。由于其具有良好的保温隔热性能,目前在建筑节能领域有了较大范围的市场应用。在应用过程中,通常将其作为骨料来制备保温砂浆。但玻化微珠保温砂浆常存在强度值较低及导热系数偏大等不足之处。除此之外,受施工环境及工艺影响,保温砂浆涂抹厚度及材料均匀性难以保证,也在一定程度上降低了其节能效果。因此,有针对性的对玻化微珠保温砂浆进行改性研究,在提高其强度的同时,改善导热性能,以期制备性能良好的玻化微珠保温板材来拓展其应用范围。这里主要探索了在保温砂浆中加入石灰及矿物掺合料后,对玻化微珠保温材料的一些性能影响。通过试验研究,对比了不同掺量水泥、石灰及矿物掺合料对玻化微珠保温砂浆性能的影响。当水泥用量为原材料总量的45%时,此时砂浆表观密度为320kg/m3,抗压强度为0.95MPa。用20%掺量的石灰取代水泥,调整熟石灰与生石灰的质量比为3:1,此时砂浆表观密度为295kg/m3,抗压强度为0.74MPa。在玻化微珠保温砂浆中,加入矿物掺合料后,砂浆表观密度及导热系数均有所降低。其中,加入粉煤灰后,随着掺量的增加,砂浆表观密度及抗压强度随之逐渐降低。当粉煤灰掺量为20%时,其表观密度为285 kg/m3,对应抗压强度为0.65MPa。加入矿粉后,当矿粉掺量为15%时,其表观密度为290 kg/m3,28d抗压强度值为0.80 MPa。增大矿粉掺量,砂浆稠度降低,表观密度反而有所增大。加入硅灰后,保温砂浆的早期及后期强度均有较大提高。当硅灰掺量为水泥用量的10%时,其表观密度为280 kg/m3,抗压强度值达到0.95 MPa,导热系数在所有试样中最低为0.063 W/m·K。将矿物掺合料进行复掺,同样有较好的性能表现。将15%掺量的矿粉与5%掺量的硅灰混合掺加后,其表观密度最低为280 kg/m3,抗压强度值达到0.93MPa,对应导热系数为0.065 W/m·K。加入20%掺量的石灰后,其体积吸水率较大为38.6%。加入矿物掺合料,并用0.3%掺量的憎水剂进行处理后,体积吸水率最低为26.3%。在玻化微珠保温材料表面进行增强防护,可以提高其抗折强度。
[Abstract]:The expanded vitrified beads are usually inorganic lightweight materials with surface glass closure and cavity structure. Because of its good thermal insulation performance, it has a wide range of market applications in the field of building energy conservation. In the process of application, it is usually used as aggregate to prepare insulating mortar. However, glass microbead insulation mortar often has some shortcomings, such as low strength and large thermal conductivity. In addition, due to the influence of construction environment and technology, it is difficult to ensure the thickness and uniformity of the coating of insulating mortar, and to some extent reduce its energy-saving effect. Therefore, the modification of vitrified microbead thermal insulation mortar is aimed at improving its strength and improving its thermal conductivity, in order to prepare the glass microbead thermal insulation board with good performance to expand its application scope. The influence of lime and mineral admixture on the properties of glass microbead insulation material is studied in this paper. The effects of cement, lime and mineral admixtures on the properties of vitrified microbead insulating mortar were studied. When the cement content is 45% of the total raw material, the apparent density of mortar is 320kg / m ~ (3) and the compressive strength is 0.95MPa. The cement was replaced by 20% lime and the mass ratio of hydrated lime to quicklime was adjusted to 3: 1. The apparent density of mortar was 295kg / m ~ 3 and the compressive strength was 0.74 MPA. The apparent density and thermal conductivity of the mortar decreased with the addition of mineral admixture in the vitrified microbead thermal insulation mortar. The apparent density and compressive strength of mortar decrease with the increase of fly ash content. When the content of fly ash is 20, the apparent density is 285 kg / m ~ (3) and the corresponding compressive strength is 0.65 MPA. When the mineral powder is added to it, the apparent density is 290 kg / m ~ (328d) and the compressive strength is 0.80 MPA. With the increase of mineral powder content, the consistency of mortar decreases and the apparent density increases. After the addition of silica fume, the early and late strength of the thermal insulation mortar is greatly improved. The apparent density is 280 kg / m ~ (3), the compressive strength is 0.95 MPA, and the thermal conductivity is 0.063 W / m ~ (K). Mineral admixtures also have good performance. When mixed with 15% mineral powder and 5% silica fume, the apparent density is the lowest 280kg / m ~ (3), the compressive strength is 0.93MPa, and the corresponding thermal conductivity is 0.065 W / m ~ (K). When 20% lime was added, the volume water absorption was 38.6%. When mineral admixture was added and treated with 0.3% hydrophobic agent, the lowest volume water absorption rate was 26.3. The surface of glass microbead insulation material can be strengthened and protected, and its flexural strength can be improved.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34

【相似文献】