Dr. Zujian Huang

South China University of Technology, China


Talk Title
Hygrothermal Properties Oriented Development of Bamboo for the Application in Building Envelope

Talk Abstract

The application promotion of bamboo in building envelope industry possesses multiple potentials such as high-value utilization of the bamboo forest resources and improvement of the building performance. In this study, 6 bamboo products, including 1 raw bamboo and 5 typical bamboo-based panels were selected as the research objects. Based on the material parameter requirements of the building envelope heat-air-moisture transfer model, 7 test items for hygric and thermal properties, and 2 test items for basic properties, including dry bulk density (ρ) and open porosity (Φ), were carried out. Correlation analysis between hygrothermal properties and basic properties showed that, macroscopically both moisture and heat transport properties showed stronger correlation with Φ than with ρ. Taking the correlation coefficient (r) and the statistical significance (sig) as indicators, the correlations between the hygrothermal properties and Φ were, respectively, 107.23%–140.00% and 1.44%–11.94% of those between the hygrothermal properties and ρ. In particular, the (r, sig) values of capillary saturated moisture content wcap, water vapor transfer coefficient δ, water absorption coefficient Acap, drying rate U and thermal conductivity λ, correlated with ρ were (−0.5361, 0.021829), (−0.6014, 0.000006), (−0.8249, 0.000025), (−0.7359, 3.1545E-7) and (0.4232, 0.080111), while the values correlated with Φ were (0.6740, 0.002159), (0.6745, 1.4681E-7), (0.9002, 3.5973E-7), (0.7891, 1.0776E-8) and (−0.5925, 0.009565). In the manufacturing process of industrial utilized bamboo, the bulk density was often used as an important product control index, as it had significant correlation with the mechanical properties. This was widely accepted in the studies on bamboo as load-bearing structure, which were mostly mechanical performance-oriented. However, the development of bamboo for building envelope was supposed to be hygrothermal performance-oriented, and the correlation analysis results in this study proved that the open porosity was a better choice to be the control index for the development of hygrothermal properties-oriented bamboo. At the end, a method including 6 operation steps to test the open porosity of bamboo was introduced, which was modified from the existing test standards. 

Bamboo; Building envelope; Hygrothermal properties; Correlation analysis; Open porosity
Short Biography

Zujian Huang is a postdoctoral fellow from School of Architecture, South China University of Technology, and also a verifier of the AHA (Active House Alliance), senior member of the HKCBEES (Hong Kong Chemical, Biological& Environmental Engineering Society), member of the ASC (Architectural Society of China), national certified planner of the MOHURD (Ministry of Housing and Urban-Rural Development of China), and reviewer of several academic journals, e.g. Construction and Building Materials. He focuses on the research of building materials and construction, especially the hygrothermal performance-oriented bamboos and their construction techniques. He has finished a monograph ‘Application of Bamboo in Building Envelope’ published by the Springer International Publishing, about 20 papers, and several patents in recent years

Target Audience
Students, Post doctoral, Industry, Doctors and professors
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