Paralkar Vismaya, Damle Rashmin
CEPT University, Ahmedabad, India.
UCL Open Environ. 2024 Sep 10;6:e1988. doi: 10.14324/111.444/ucloe.1988. eCollection 2024.
Lime plaster is a sustainable building material that can be an effective passive cooling strategy. The moisture buffering quality of lime causes adsorption and desorption of moisture which moderates the indoor relative humidity. Its vapour permeability is also influential in moisture transfer across the building envelope. Lime plaster also has a self-healing quality which prevents the formation of inner cracks. Moreover, its strength increases with time leading to a longer life span. In old structures, an important function is the breathability of ceilings and walls. Hence, it is often used in conservation projects where it improves the appearance and durability of old buildings. Often organic additives employed to impart certain qualities to the lime mortar/plaster led to mould growth. Mould growth degrades indoor air quality, and the occupant health is compromised. To avoid mould-related problems, it is necessary to understand the behaviour of lime plaster with respect to the indoor relative humidity and surface moisture content. This paper focuses on the hygrothermal performance of lime plaster in naturally ventilated residential spaces. Surveys were carried out in 45 traditional buildings in Ahmedabad in India with measurements of ambient variables, such as temperature, relative humidity, wall moisture content, etc. The mould growth patterns of these spaces are related to the measured variables and wall characteristics. Hygrothermal simulations of some spaces were also carried out to observe the moisture buffering of lime plaster. Experimental observations were then compared to simulation results to see if the predictions of the hygrothermal models were realistic.
石灰石膏是一种可持续的建筑材料，可作为一种有效的被动冷却策略。石灰的吸湿缓冲特性会导致水分的吸附和解吸，从而调节室内相对湿度。其蒸汽渗透性对穿过建筑围护结构的水分传输也有影响。石灰石膏还具有自我修复特性，可防止内部裂缝的形成。此外，其强度会随时间增加，从而延长使用寿命。在旧建筑结构中，天花板和墙壁的透气性是一项重要功能。因此，它经常用于保护项目，可改善旧建筑的外观和耐久性。通常用于赋予石灰砂浆/石膏某些特性的有机添加剂会导致霉菌生长。霉菌生长会降低室内空气质量，并损害居住者的健康。为避免与霉菌相关的问题，有必要了解石灰石膏在室内相对湿度和表面含水量方面的表现。本文重点研究自然通风住宅空间中石灰石膏的湿热性能。在印度艾哈迈达巴德的45栋传统建筑中进行了调查，测量了环境变量，如温度、相对湿度、墙体含水量等。这些空间的霉菌生长模式与测量变量和墙体特性有关。还对一些空间进行了湿热模拟，以观察石灰石膏的吸湿缓冲情况。然后将实验观察结果与模拟结果进行比较，以查看湿热模型的预测是否现实。
