Evaluation of light transmittance performance of light-transmitting concrete with optical fibre

Chiew, Shing Mei; Ibrahim, Izni Syahrizal; Ariffin, Mohd Azreen Mohd; Lee, Han-Seung; Singh, Jitendra Kumar

doi:10.1016/j.conbuildmat.2022.128949

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…The spectral transmittance of the material T (λ) is defined as the ratio of the radiation I T (λ) passed through the sample to the intensity of radiation I 0 (λ) incident on the sample, as shown in the Figure 23. The light-transmission performance of translucent concrete decreases as the angle of incidence of light increases; 30 • is the limit of the acceptance angle of an optical fiber, and at this point most of the light is outside the acceptance cone, meaning that it contains the entire area of internal reflection [61].…”

Section: Daylight Factor Assessmentmentioning

confidence: 99%

Illumination of Interior Spaces through Structures Made of Unified Slabs of High-Performance Light-Transmitting Concrete with Embedded Optical Fibers

2023

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Light-transmitting concrete as a building material already exists in many forms, but its light properties and the possibilities of using it to improve the lighting of interior spaces have not been investigated in detail yet. This paper focuses on the illumination of interior spaces using constructions made of light-transmitting concrete, which will allow light to pass between individual spaces. The experimental measurements carried out are divided into two typical situations using reduced room models. The first part of the paper focuses on the illumination of the room through the penetration of daylight through the ceiling made of light-transmitting concrete. The second part of the paper investigates the transmission of artificial light from one room to another through a non-load-bearing dividing structure composed of unified slabs of light-transmitting concrete. For the experiments, several models and samples were created for comparison. The first step of the experiment was to create slabs of light-transmitting concrete. While there are many options to produce such a slab, the best option is to use high-performance concrete with glass-fiber reinforcement, which improves the load transfer properties, and plastic optical fibers for light transmission. By adding optical fibers, we can achieve the transmission of light between any two spaces. For both of the experiments, we used reduced-scale models of rooms. Slabs with dimensions of 250 × 250 × 20 mm and 250 × 250 × 30 mm were used in three versions: concrete slabs with optical fibers, concrete slabs with air holes and solid slabs. The experiment measured and compared the level of illumination at several points in the model as it passed through each of the three different slabs. Based on the results of these experiments, it was concluded that the interior level of illumination of any space can be improved by using light-transmitting concrete, especially those without access to natural light. The experiment also assessed the strength properties of the slabs in relation to their intended use and compares them with the properties of stone slabs used as cladding.

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Section: Daylight Factor Assessmentmentioning

confidence: 99%

Illumination of Interior Spaces through Structures Made of Unified Slabs of High-Performance Light-Transmitting Concrete with Embedded Optical Fibers

2023

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“…The influence of the angle of incidence on transmittance of light transmitting concrete has been studied and the direct incidence of light is found to have the best transmittance. Artificial luminaries at angles of 30 • or higher seem to have low transmittance characteristics and the other factors, such as the number of fibers or their diameter, seem to be of low significance especially at higher incidence angles [11]. Translucent concrete walls exhibit a climate-responsive transmittance characteristic, effectively optimizing solar heat gain during winter through increased transmittance while minimizing heat gain during summer by reducing transmittance.…”

Section: Introductionmentioning

confidence: 99%

Annual Transmittance Behavior of Light-Transmitting Concrete with Optical Fiber Bundles

Shenoy,

Nayak,

Tantri

et al. 2023

Materials

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This study characterizes the transmittance behavior of structural light-transmitting concrete under natural sunlight. The experimentation involves the use of a novel test setup and a detailed analysis considering the variation and dependence on time of day, month of the year and seasonal variations. The test set consisted of 28 variations of fiber configurations, with two different diameters, spacing and bundling techniques used to increase the area of fibers while maintaining spacing to aid the placing of concrete without compromising on transmittance. The study provides a real-time observational understanding of the behavior of light-transmitting concrete, a result usually obtained by modelling and simulation. The statistical analysis helps in understanding the impact of various variables as well as their interrelationships, which can help in design optimization. Based on the behavior as well as the stipulations of standards, the applicability of the material to various structural applications has been identified.

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“…In order for the measurement to have a meaningful value, we performed a measurement close to the desired condition, that is, in a uniformly cloudy sky in winter [64] The spectral transmittance of the material T (λ) is defined as the ratio of the radiation IT (λ) passed through the sample to the intensity of radiation I0 (λ) incident on the sample, as shown in the Figure 61. The light transmission performance of translucent concrete decreases as the angle of incidence of light increases, 30° is the limit of the acceptance angle of an optical fiber, and at this point most of the light is outside the acceptance cone, meaning that it contains the entire area of internal reflection [69].…”

Section: Daylight Factor Assessmentmentioning

confidence: 99%

Translucent composite slabs from high-performance concrete with optical fibers - technical solution and analysis

Štochl

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Light transmitting concrete as a building material already exists in many forms, but its light properties and the possibilities of using it to improve the lighting of interior spaces, have not been investigated in detail yet. This work focused on the illumination of interior spaces using constructions made of light-transmitting concrete, which will allow light to pass between individual spaces. The experimental measurements carried out are divided into two typical situations using reduced room models. The first part of the work measured the light parameters of the room through the penetration of daylight through the ceiling from light-transmitting concrete. The second part of the work investigated the transmission of artificial light from one room to another through a non-load-bearing dividing structure composed of unified slabs of light-transmitting concrete. For the experiments, several models and samples were created for comparison. The first step of the experiment was to create slabs of light-transmitting concrete. While there are many options to produce such a slab, the best option is to use high-performance concrete with glass fibers reinforcement, which improve the load transfer properties, and plastic optical fibers for light transmission. By adding optical fibers, we can achieve the transmission of light between any two spaces. For both parts of the experiments, we used reduced scale models of rooms. Slabs with dimensions of 250x250x20 mm and 250x250x30 mm were used in three versions: concrete slabs with optical fibers, concrete slabs with air holes and solid slabs. The experiment measured and compared the level of illumination at several points in the model as it passed through each of the three different slabs. Based on the results of these experiments it was concluded that the interior level of illumination of any space can be improved by using light-transmitting concrete, especially those without access to natural light. The experiment also assessed the strength properties of the slabs in relation to their intended use and compared them with the properties of stone slabs used as cladding.

show abstract

Evaluation of light transmittance performance of light-transmitting concrete with optical fibre

Cited by 7 publications

References 21 publications

Illumination of Interior Spaces through Structures Made of Unified Slabs of High-Performance Light-Transmitting Concrete with Embedded Optical Fibers

Illumination of Interior Spaces through Structures Made of Unified Slabs of High-Performance Light-Transmitting Concrete with Embedded Optical Fibers

Annual Transmittance Behavior of Light-Transmitting Concrete with Optical Fiber Bundles

Translucent composite slabs from high-performance concrete with optical fibers - technical solution and analysis

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Evaluation of light transmittance performance of light-transmitting concrete with optical fibre

Cited by 7 publications

References 21 publications

Illumination of Interior Spaces through Structures Made of Unified Slabs of High-Performance Light-Transmitting Concrete with Embedded Optical Fibers

Illumination of Interior Spaces through Structures Made of Unified Slabs of High-Performance Light-Transmitting Concrete with Embedded Optical Fibers

Annual Transmittance Behavior of Light-Transmitting Concrete with Optical Fiber Bundles

Translucent composite slabs from high-performance concrete with optical fibers - technical solution and analysis ﻿

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Translucent composite slabs from high-performance concrete with optical fibers - technical solution and analysis