###### Abstract  
Concrete is an essential material in the construction industry due to its strength and versatility. However, its quality can be compromised by environmental factors during its fresh and early-age states. To address this vulnerability, various sensors have been implemented to monitor critical parameters. While high-precision sensors (e.g., piezoelectric and fiber optic) offer accurate measurements, their cost and fragility limit their widespread use in construction environments. In response, this study proposes a cost-effective, Arduino-based wireless monitoring system to track temperature and humidity in fresh and early-age concrete elements. The system was validated through laboratory tests on cylindrical specimens and industrial applications on self-compacting concrete New Jersey barriers. The sensors recorded temperature variations between 15 \({}^{\circ}\)C and 35 \({}^{\circ}\)C and relative humidity from 100% down to 45%, depending on environmental exposure. In situ monitoring confirmed the system's ability to detect thermal gradients and evaporation dynamics during curing. Additionally, the presence of embedded sensors caused a tensile strength reduction of up to 37.5% in small specimens, highlighting the importance of sensor placement. The proposed solution demonstrates potential for improving quality control and curing management in precast concrete production with low-cost devices. 2020 IEEE/RSJ International Conference on Intelligent Systems (IEEE)  
frameworks to describe key early-age [3], and emphasized the importance of early mechanical response in advanced construction technologies such as 3D printing [4]. Therefore, real-time monitoring of fresh concrete properties is essential to ensure quality control and prevent potential structural defects. Key properties in the fresh state include consistency, workability, aggregate stability, and compactability, all of which determine the material's performance [5]. Previous studies have investigated various mix designs to optimize these characteristics. [PERSON] and [PERSON] (2010) [6] experimentally explored optimum mix designs for enhanced permeable concrete, focusing on balancing strength with permeability. [PERSON] and [PERSON] (2008) [7] proposed a theoretical and experimental methodology for earth-moist concrete to improve compaction and surface finish, while [PERSON] (2009) [8] provided an extensive compilation of mix design strategies and test methods for engineered concretes. Together, these studies emphasize the relevance of tailoring fresh concrete properties through controlled mixture proportions to meet specific performance demands in both conventional and specialized construction contexts. To assess these properties, different sensor technologies have been implemented, enabling real-time measurement of critical parameters [9].These sensors provide accurate data that facilitate decision-making during construction and enhance the overall quality of the final product [10]. Over the past decades, sensor technology for concrete monitoring has undergone significant advancements. Early systems relied on electrical resistance sensors [11; 12], which laid the foundation for more sophisticated techniques, such as ultrasonic and electromagnetic sensors [13; 14; 15]. More recently, high-precision sensor systems, including fiber optic [16], piezoelectric [17], and magnetostrictive sensors [18], have been developed to enhance structural health monitoring. These technologies allow for the accurate measurement of key parameters such as stress, strain, cracking, and temperature. High-precision fiber optic sensors, such as the SOFO system used by [PERSON] and [PERSON] (2000) [19], have proven effective for monitoring early-age concrete, although their cost and installation complexity limit their use in large-scale or industrial applications. Several studies have demonstrated the potential of piezoelectric-based monitoring systems for characterizing early-age behavior of concrete. For instance, [PERSON] et al. (2006) [20] and [PERSON] et al.