In the ever-evolving landscape of construction materials, understanding the behavior of cementitious mortars under temperature fluctuations is crucial for ensuring structural integrity and longevity. A recent study led by Luan Reginato has introduced a new methodology for accurately measuring the coefficient of thermal expansion (CTE) of these materials, which could have significant ramifications for the construction sector.
Cementitious materials, known for their inherent porosity, often experience changes in their hygrothermal equilibrium due to temperature variations. These changes can lead to discrepancies in CTE measurements, which are vital for predicting how materials will expand or contract under different environmental conditions. Reginato’s research highlights that many existing methodologies fall short by not adequately controlling moisture levels or considering procedural intricacies, which can result in costly inaccuracies.
“Our findings reveal that the moisture content of cementitious mortars plays a pivotal role in their thermal expansion properties,” Reginato stated. “By refining the testing methodology, we can achieve a more precise understanding of how these materials behave in real-world conditions.”
The study evaluated two methodologies for determining CTE, ultimately recommending one that demonstrated superior precision. This approach involves heating the mortar sample to 80ºC at a fixed relative humidity until it reaches hygrothermal equilibrium. Measurements are then taken as the sample cools to 22 ± 2°C, allowing for a detailed analysis of length variations due to temperature changes. The results showed a repeatability standard deviation of 0.08×10−6/ºC, which is significantly more accurate than traditional methods such as ASTM C 531.
One of the most compelling findings of the research was the parabolic behavior of CTE in relation to moisture levels, peaking at around 75% relative humidity. This insight aligns with existing literature and underscores the importance of considering environmental factors when selecting materials for construction projects. “This methodology not only enhances precision but also emphasizes the need for compatibility between repair mortars and substrates across varying moisture levels,” Reginato added.
For construction professionals, the implications of this research are profound. With a more reliable method for assessing thermal expansion, engineers and architects can make better-informed decisions regarding material selection and design, ultimately leading to structures that are more resilient to temperature fluctuations and moisture-related issues. This could translate into reduced maintenance costs and enhanced safety for buildings and infrastructure.
As the construction industry continues to seek innovative solutions to improve material performance, Reginato’s research stands out as a significant advancement. The findings, published in the ‘Revista IBRACON de Estruturas e Materiais’ (IBRACON Journal of Structures and Materials), pave the way for future developments in the field, potentially influencing standards and practices across the industry.
For more information about Luan Reginato’s work, you can visit his profile at lead_author_affiliation.