| Building energy consumption has remained high for a long time..It is particularly important to study new building envelope materials and components which are energy-saving technology,good development performance,low energy consumption,functional and industrialized for alleviating resource pressure and improving environmental quality.As a new type of functional building material,translucent concrete emerges at the historic moment.Translucent concrete is composed of resin,optical fiber,plexiglass and other light-conducting materials coupled with concrete matrix.The light-guided material is used to introduce outdoor natural light into the room,which improves the lighting level of the building,improves the indoor lighting quality,alleviate the"light pressure"caused by artificial lighting,reduce lighting energy consumption and reduce the energy consumption of the lighting while reducing the window-to-wall ratio of the building to a certain extent,avoiding the phenomenon of cold and hot bridge and cold wind penetration caused by the increase of lighting window area.In this paper,by testing the translucency of three different light guide materials,combined with the economic cost and preparation process of the light guide material,the"pure and inexpensive"plexiglass is determined as the light guide material of the translucent concrete building.The freeze-thaw cycle and compressive strength test of this type of translucent concrete were carried out.The mechanical properties parameters were quantified and the interface contact area between the composite matrix and the light guide was verified to be an important factor leading to the decrease of mechanics and durability.Based on the theoretical method,combined with the construction method of the reinforced masonry,the optimal size of the block was finally determined.Subsequently,the minimum transformation area and the best transformation position of the translucent concrete component were further determined by ECOTECCT simulation,and the construction of the translucent concrete laboratory was completed.On this basis,the heat transfer coefficients of translucent concrete component were dynamically measured on site by using double-sided heat flow meter to understand the thermal performance of transparent concrete component.According to the climatic conditions in Dalian area,the indoor light and heat environment created by translucent concrete buildings was studied experimentally from the perspective of building system.The results showed that the average thermal resistance of the translucent concrete component with a light-guide doping ratio of 12.56%and a modified area of 0.56 m~2 was 0.59(m~2?K)/W,and the heat transfer coefficient was 1.69 W/(m~2?K).It is close to the insulation performance of high-efficiency Low-e insulating glass containing 12mm of argon gas,and the outdoor temperature peak was delayed from the outdoor to the interior through the transparent concrete wall for about one hour.Under winter and summer,cloudy and sunny weather conditions,the overall indoor illumination level was increased by 22.4lx,28.5lx,62.1lx and86.6lx respectively;the illumination uniformity was increased by 1.32%,3.13%,2.38%and4.25%respectively;the lighting time was reduced by 2.95%,7.21%,3.48%and 14.46%respectively;the daytime radiation heating effectΔtg-a was increased by 0.1℃,0.37℃,0.28℃,0.56℃at night,respectively.They were reduced by 0.05℃,0.06℃,0.03℃and 0.07℃respectively.The increase in light-transmissive concrete members effectively improves indoor thermal comfort during summer nights and winter days. |
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