Light-transmitting concrete: Performance and novel casting methods

Today, with the increase in population, the amount of energy consumption has increased; as well, high-level construction in urban areas has increased. In this regard, the shading of tall buildings has further increased energy consumption. The present research provides a solution to reduce energy consumption associated with buildings lighting by introducing new techniques associated with casting light transmitting concrete. For this purpose, 4 mixing designs are presented as, 1- reference concrete (Ref), 2- light-transmitting concrete based on plastic optical fibers (B1), 3- light-transmitting concrete based on ribbed resin rods (B2), 4- composite based on tempered glass waste and epoxy resin (B3). Since the samples are used as external walls, first the mechanical characteristics were investigated and then with the aim of assessing the effect of using the materials on energy consumption, a building was modeled with Design Builder software. Considering the results, samples B1 and B2 provided acceptable compressive strength in terms of structural performance. However, regarding tensile strength, only sample B1 can be used in the structure. In sample B2, the cost of consumables has decreased by 86.5 % compared to sample B1, which can be more suitable for non-structural applications. Compared to other samples, sample B3 has been associated with a 26 % decrease in volumetric mass and a 10-fold increase in light transmission; in addition, it has better efficiency than glass, which can replace glass windows. In general, all samples are more suitable for cold climates and are not recommended for hot climates. The north and south walls are more suitable for the use of samples.