Karakteristik Sifat Mekanik dan Efisiensi Cahaya pada Light Transmission Concrete (LTC) sebagai Penerapan Konsep Green Building

Abstract

The building sector is the sector that consumes the most energy with 19% of global energy consumption being used for lighting. This encourages the application of the concept of green building as an effort to reduce negative impacts on the environment. One of the efforts made is through energy efficiency in buildings, especially in lighting energy. Utilization of sunlight in buildings is an alternative source of lighting to achieve energy efficiency. Therefore, the innovation of Light Transmission Concrete (LTC) arose, which is a concrete technology that is able to transmit sunlight into buildings. The purpose of this study was to determine the ability of concrete to transmit light to various variations of Plastic Optical Fiber (POF) arrangements. In addition, this study also aims to determine the mechanical properties of LTC such as compressive strength and flexural strength. The research method used is to conduct experiments in the laboratory. The test object used was concrete with a design quality of 20 MPa with a variation of the 7x7 POF arrangement and the 8x8 POF arrangement. The number of POF used in each hole is 2, 3 and 4 POF. The tests carried out in this study were in the form of light intensity testing, compressive strength tests and flexural strength tests. The results of the light intensity test showed an increase with increasing variations of the POF arrangement. The maximum light intensity obtained for the cube test object is 46.26 lux in the variation of the 8×8 POF arrangement with a total of 4 POF. The maximum light intensity obtained for the beam test object was 56.34 lux in the variation of the 8×8 POF arrangement with a total of 4 POF. The results of the compressive strength test showed a decrease in compressive strength where the maximum compressive strength occurred in LTC with a 7×7 POF arrangement with a total of 2 POF of 21.55 MPa. While the flexural strength increased with the maximum flexural strength occurring in LTC with an 8×8 POF arrangement with a total of 4 POF of 4.38 MPa. From the results of theoretical light saving calculations, it is found that the use of LTC can save room lighting up to 27.81%.