湿度对污泥烧结页岩多孔砖及其墙体热工性能影响的试验研究

发布时间：2018-07-31 13:32

【摘要】：在全面建设小康社会进程中,能源无疑是重要保障。在政府大力推进节能政策及相关标准,结合广西地区气候特点,根据目前相关规范对非饱和湿度多孔材料的导热系数认识不足,缺少大量实验研究数据基础和合适的理论分析模型。因此,本文针对污泥烧结页岩多孔砖、保温砂浆和普通砂浆开展了含水率与等效导热系数关系的理论分析和试验研究,并进一步研究了含水率、抹面砂浆的类型及厚度对墙体热工参数的影响。本文通过研究含水率与等效导热系数的理论关系,将串联模型与并联模型进行综合考虑,并结合了固、液、气三相状态的理论推导,得到非饱和湿度墙体材料等效导热系数与干态下导热系数的推导计算式。将试验值与对应的理论计算值进行对比分析,当含水率低于15%时,理论推导公式具有一定的适用性,但对于普通砂浆不具有适用性。含水率对墙体材料的等效导热系数影响显著,对于不同种类材料,其影响程度不同,而初期含水率对墙体材料导热系数的影响具有主要作用。根据试验结果,拟合出污泥烧结页岩多孔砖、保温砂浆、普通砂浆的等效导热系数计算式,反映出含水率对墙体材料等效导热系数的影响规律。本文进行含水率对墙体传热系数影响的理论分析和试验研究,将不同含水率情况下的等效导热系数代入到墙体传热系数理论计算式,可得试验检测值比理论计算值偏大,其修正系数为1.34。墙体的含水率、抹面砂浆类型及厚度对墙体的传热系数有显著影响,当含水率平均每升高1%时,则10mm厚、20mm厚普通抹面砂浆墙体PQT-1及PQT-2、10mm厚、20mm厚保温抹面砂浆墙体BQT-1及BQT-2传热系数分别增加1.26%、1.33%、1.65%和1.88%,抹面砂浆厚度每增加10mm,普通抹面砂浆与保温砂浆的传热系数分别约减少4.2%和12.7%。对普通抹面砂浆墙体内部进行冷凝现象检验,其理论计算与试验检验结果一致,墙体内部无冷凝现象。本文研究结果表明:通过含水率对材料导热系数影响的理论分析和试验研究,对含水率与导热系数的关系有一定认识。对于墙材,首先选择保温隔热性能优良的材料,同时考虑环境湿度对材料含水率的影响,则应选择具有密闭多孔性材料,以使材料中的水分含量较低。通过制作工艺、原料使墙材表面形成自密性,从而防止水分进入墙材影响热工参数,或通过其它措施以保证保温隔热材料中水分维持在较低水平。由于湿度环境同样影响墙体的含水率,因而注意墙体防潮。为减小湿度对墙体影响,可在墙体水分含量较低时,增设墙体表面隔水层等措施,同时应结合墙体内部冷凝防护措施,综合考虑。通过含水率对墙材与墙体的热工性能影响研究,了解到含水率对其影响原理,对墙材的选用及建筑施工提供可靠的技术支撑和参考依据,指导施工技术人员掌握墙体施工要点,注意做好防潮措施,促进建筑节能工作的进展。
[Abstract]:In the process of building a well-off society in an all-round way, energy is undoubtedly an important guarantee. In the government's efforts to promote energy conservation policies and related standards, combined with the climate characteristics of Guangxi region, according to the current relevant norms of unsaturated humidity porous material thermal conductivity is not well understood. Lack of a large number of experimental research data base and appropriate theoretical analysis model. Therefore, the relationship between moisture content and equivalent thermal conductivity of sludge sintered shale porous brick, insulating mortar and ordinary mortar has been studied theoretically and experimentally, and the moisture content has been further studied. The influence of the type and thickness of the mortar on the thermal parameters of the wall. By studying the theoretical relationship between moisture content and equivalent thermal conductivity, the series model and the parallel model are considered comprehensively, and the theoretical derivation of the three-phase state of solid, liquid and gas is combined. The formulas for calculating the equivalent thermal conductivity of unsaturated humidity wall material and the thermal conductivity under dry state are obtained. When the moisture content is lower than 15, the theoretical formula is applicable to a certain extent, but it is not applicable to ordinary mortar. The effect of moisture content on the effective thermal conductivity of wall materials is significant, and the influence degree is different for different kinds of materials, but the effect of initial moisture content on the thermal conductivity of wall materials is mainly affected. According to the experimental results, the formula of equivalent thermal conductivity of sintered shale porous brick, insulating mortar and ordinary mortar is fitted, which reflects the influence of moisture content on the equivalent thermal conductivity of wall materials. In this paper, the influence of water content on the heat transfer coefficient of the wall is studied theoretically and experimentally. The equivalent heat conductivity under different moisture content is added to the theoretical formula of the heat transfer coefficient of the wall, and the measured value of the test is larger than the calculated value of the theory. The correction coefficient is 1.34. The moisture content of the wall, the type and thickness of the mortar on the surface have a significant effect on the heat transfer coefficient of the wall. The heat transfer coefficients of PQT-1 and PQT-210mm thick PQT-1 and PQT-210mm thick thermal insulation mortar wall increased by 1.26and 1.331.65% and 1.88mm, respectively, and the heat transfer coefficient of ordinary plaster mortar and thermal insulation mortar decreased by 4.2% and 12.7%, respectively. The theoretical calculation and test results are consistent with the test results, and there is no condensation phenomenon in the wall. The results show that the relationship between moisture content and thermal conductivity is well understood through the theoretical analysis and experimental study of the effect of water content on the thermal conductivity of materials. For the wall materials, the materials with excellent thermal insulation performance and the effect of environmental humidity on the moisture content of the materials should be selected first, so that the moisture content in the materials can be lower. Through the manufacturing process, the raw material makes the wall surface self-dense, thus preventing the moisture from entering the wall material to affect the thermal parameters, or by other measures to ensure that the moisture in the insulation material is maintained at a lower level. Because the humidity environment also affects the moisture content of the wall, so pay attention to the wall moisture-proof. In order to reduce the influence of humidity on the wall, some measures, such as water isolation layer on the wall surface, should be added when the moisture content of the wall is low, and should be considered synthetically in combination with the condensation protection measures inside the wall. Through the research on the influence of moisture content on the thermal performance of wall material and wall, the principle of water content influence on wall material is understood, and the reliable technical support and reference basis are provided for the selection of wall material and construction, and the construction technicians are guided to master the main points of wall construction. Pay attention to moisture-proof measures to promote the progress of building energy conservation.
【学位授予单位】：广西科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU522.1

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