Thermal insulation material produced from recycled materials for building applications: cellulose and rice husk-based material

Abstract

Construction materials derived from agro-industrial waste are increasingly attractive in the building sector, due to their sustainability and lower environmental impact. Hence, in recent years worldwide the amount of research and publications tending to the development of materials that take advantage of residues from agro-industrial activities has increased. The role of thermal insultation materials in the building envelope is significant, especially in hot-humid region. This study presents the manufacturing and evaluation of a cellulose and rice husk-based insulation material, as a proposal for the reuse of materials considered as value-added waste, such as recycled paper and rice husks. Boards and test specimens were elaborated, as well as mechanical and thermal tests. The material was evaluated by means of thermal tests, in accordance with ASTM C177, to measure the thermal conductivity. Tensile and compressive strength tests were performed, based on ASTM C209 and ASTM C39 Standard, respectively. According to the results obtained, the material shows a thermal coefficient of 0.04 W/m∙K which corresponds to a material with the potential to thermally insulate an enclosure. Maximum stresses were obtained for the 3 compositions in average for a range between 1.31 and 1.76 MPa. Ultimate compressive strength obtained was between 20.19 and 21.23 MPa. The proposed material is presented as a sustainable alternative, which can be used in the field of environmentally friendly buildings, which contribute to reducing the carbon footprint, by energy savings.

Rice Husk-Based Insulators: Manufacturing Process and Thermal Potential Assessment

“…All the raw materials were obtained in Chitré, Azuero Peninsula, Panamá. The methodology for the rice husk panel manufacture is based on previous experiences of the authors [ 17 , 41 , 42 ]. To summarize, the steps taken to obtain a rice husk panel were as follows: The rice husk was ground, and the resulting material was weighed.…”

“…Due to the steady-state thermal condition inside the box, the value of the surface temperature on one of the material surfaces was known. To obtain the temperature of the external surface, a FLUKE Ti 110 infrared thermometer (Hebi, China) was used [ 17 , 42 , 43 ].…”

“…Natural vegetable fibers have shown excellent results in improving living conditions within a residence [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Natural fibers have been used as building materials, such as high-strength concrete [ 12 , 13 , 14 , 15 ], seismic reinforcements [ 16 ], and thermal insulation [ 17 , 18 , 19 ].…”

“…Rice husk has been the subject of study due to its thermal insulation properties [ 3 , 4 , 6 , 7 , 8 , 15 , 17 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. The studies conducted have demonstrated the good insulating properties when mixed with different types of binders, such as paper pulp cellulose, where a thermal conductivity of 1.08 W/m K was obtained.…”

“…The role of thermal insultation materials in the building envelope is significant, especially in hot–humid regions [ 17 ], and Panama is no exception. The need for climatization indoors represents between 30 and 40% of energy consumption [ 10 , 34 , 35 ].…”