The seemingly useless reeds are prepared as thermal insulation materials,which not only meet the requirements of environmental sustainability but also enhance the added value of reeds,creating new economic benefits.Th...The seemingly useless reeds are prepared as thermal insulation materials,which not only meet the requirements of environmental sustainability but also enhance the added value of reeds,creating new economic benefits.The hydrophobicity of raw biomass surfaces leads to problems such as weak bonding strength and non-dense structure in the formed materials,as well as issues related to the residual insect infestations on the surface.In this study,reed straw was used as the raw material,and foamed geopolymer was used as the binder to prepare building insulation materials based reed.To improve the interfacial adhesion performance between reed straw and foamed geopolymer,a thermochemical modification method-thermal carbonization,was proposed.In this study,the mechanical properties and hydraulic properties of the studied materials with different degrees of surface thermal modification were tested,especially the fire resistance performance,and weathering resistance performance rarely found in published literature.When the surface thermal modification condition of reed straw was 250℃(30 min),the comprehensive performance of reed-based building insulation materials was the best,when the studied material density was 321.3 kg/m^(3);the compressive strength was 0.59 MPa;the thermal conductivity was 0.101 W/(m·K);the pH was 11.27;the moisture absorption rate was 25.1%,and the compressive strength loss rate in wet-dry cycles was 18.5%.In addition,it had excellent fire resistance performance and weathering resistance performance.This new material can be widely used to improve the thermal insulation of traditional buildings and as sandwich filler in prefabricated buildings,such as preparing insulating walls.展开更多
In addressing the challenges of solid waste disposal, this study proposed to utilize electrolytic manganese residue to produce building insulation materials. The research focused on the factors such as precursor mater...In addressing the challenges of solid waste disposal, this study proposed to utilize electrolytic manganese residue to produce building insulation materials. The research focused on the factors such as precursor material ratio, alkali activator ratio, foaming agent and foam stabilizer on the target insulation materials properties. The findings indicated that SiO_(2)/Al_(2)O_(3) molar ratio, SiO_(2)/Na_(2)O molar ratio, and liquid/solid mass ratio impact the mechanical properties of the samples. The best mechanical performance of building structural material samples was characterized by a compressive strength of 11.15 MPa and a density of 1476 kg/m3. The optimal properties for building insulation materials were a thermal conductivity of 0.131–0.104 W/(m·K), compressive strength of 1.49–0.69 MPa, and density of 533–433 kg/m^(3), with a cost of 1722–1294 CNY/m^(3). This research provides a new approach for large-scale electrolytic manganese residue utilization while enhancing insulation performance and reducing energy consumption in buildings, with promising prospects for further engineering development.展开更多
In response to the challenges posed by the transformation of China's reed industry,leading to difficulties in reed utilization,and the significant increment in raw soil from the expansion of urban infrastructure,t...In response to the challenges posed by the transformation of China's reed industry,leading to difficulties in reed utilization,and the significant increment in raw soil from the expansion of urban infrastructure,the authors proposed a novel method of coupling reed with raw soil to produce an ecological building insulation material.The aim is to enhance the thermal comfort of rural buildings and achieve building energy saving.The research has applied theoretical and experimental methods as the core means of exploration for key factors in the preparation of the novel ecological insulation material.These factors include raw soil content and curing methods.Key performance indicators such as thermal insulation,mechanical properties,fire resistance,water resistance,moisture resistance,and acoustic performance have been utilized for evaluation.The research results indicate that the proposed process and method for the preparation of the ecological insulation material effectively utilize reed and raw soil,achieving excellent multi-target performance.When the content of raw soil is in the range of 0-40%,the material's thermal conductivity ranges from 0.097 W/(m·K)to 0.104 W/(m·K),compressive strength from0.70 MPa to 0.79 MPa,water absorption rate from 29.42%to 38.95%,moisture absorption rate from 13.33%to31.48%,and the maximum sound absorption coefficient is 0.80,with a maximum sound insulation of 56.66 dB.Additionally,a non-combustible A-grade fire resistance was achieved.To expand the application space and scope of the novel material,the research team further explored on-site construction material preparation processes and conducted experimental research,focusing on the key aspect of the"curing process".The low temperature curing method of industrial heating blanket was proposed.The research results indicated that the method is feasible.At an environmental temperature of 25℃,with different curing times and curing temperatures,the material's thermal conductivity ranges from 0.089 W/(m·K)to 0.109 W/(m·K),and the compressive strength is between 0.14 MPa and 0.70 MPa,meeting the relevant parameter requirements.This research opens up avenues for other types of biomass with high economic added value applications and can be directly applied to improving the thermal environment of residential buildings,contributing to building energy saving,rural revitalization,and the implementation of dual-carbon strategies in China.展开更多
基金supported by the National Natural Science Foundation of China(No.52076070,No.52008166)the Natural Science Foundation of Hunan Province(No.2021JJ30256,No.2022JJ30139)。
文摘The seemingly useless reeds are prepared as thermal insulation materials,which not only meet the requirements of environmental sustainability but also enhance the added value of reeds,creating new economic benefits.The hydrophobicity of raw biomass surfaces leads to problems such as weak bonding strength and non-dense structure in the formed materials,as well as issues related to the residual insect infestations on the surface.In this study,reed straw was used as the raw material,and foamed geopolymer was used as the binder to prepare building insulation materials based reed.To improve the interfacial adhesion performance between reed straw and foamed geopolymer,a thermochemical modification method-thermal carbonization,was proposed.In this study,the mechanical properties and hydraulic properties of the studied materials with different degrees of surface thermal modification were tested,especially the fire resistance performance,and weathering resistance performance rarely found in published literature.When the surface thermal modification condition of reed straw was 250℃(30 min),the comprehensive performance of reed-based building insulation materials was the best,when the studied material density was 321.3 kg/m^(3);the compressive strength was 0.59 MPa;the thermal conductivity was 0.101 W/(m·K);the pH was 11.27;the moisture absorption rate was 25.1%,and the compressive strength loss rate in wet-dry cycles was 18.5%.In addition,it had excellent fire resistance performance and weathering resistance performance.This new material can be widely used to improve the thermal insulation of traditional buildings and as sandwich filler in prefabricated buildings,such as preparing insulating walls.
基金supported by the National Natural Science Foundation of China(No.52076070,No.52008166)the Natural Science Foundation of Hunan Province(No.2021JJ30256,No.2022JJ30139).
文摘In addressing the challenges of solid waste disposal, this study proposed to utilize electrolytic manganese residue to produce building insulation materials. The research focused on the factors such as precursor material ratio, alkali activator ratio, foaming agent and foam stabilizer on the target insulation materials properties. The findings indicated that SiO_(2)/Al_(2)O_(3) molar ratio, SiO_(2)/Na_(2)O molar ratio, and liquid/solid mass ratio impact the mechanical properties of the samples. The best mechanical performance of building structural material samples was characterized by a compressive strength of 11.15 MPa and a density of 1476 kg/m3. The optimal properties for building insulation materials were a thermal conductivity of 0.131–0.104 W/(m·K), compressive strength of 1.49–0.69 MPa, and density of 533–433 kg/m^(3), with a cost of 1722–1294 CNY/m^(3). This research provides a new approach for large-scale electrolytic manganese residue utilization while enhancing insulation performance and reducing energy consumption in buildings, with promising prospects for further engineering development.
基金supported by the National Natural Science Foundation of China(No.52076070,No.52008166)the Natural Science Foundation of Hunan Province(No.2021JJ30256,No.2022JJ30139)the Department of Ecology and Environment of Hunan Province(No.2021003630)。
文摘In response to the challenges posed by the transformation of China's reed industry,leading to difficulties in reed utilization,and the significant increment in raw soil from the expansion of urban infrastructure,the authors proposed a novel method of coupling reed with raw soil to produce an ecological building insulation material.The aim is to enhance the thermal comfort of rural buildings and achieve building energy saving.The research has applied theoretical and experimental methods as the core means of exploration for key factors in the preparation of the novel ecological insulation material.These factors include raw soil content and curing methods.Key performance indicators such as thermal insulation,mechanical properties,fire resistance,water resistance,moisture resistance,and acoustic performance have been utilized for evaluation.The research results indicate that the proposed process and method for the preparation of the ecological insulation material effectively utilize reed and raw soil,achieving excellent multi-target performance.When the content of raw soil is in the range of 0-40%,the material's thermal conductivity ranges from 0.097 W/(m·K)to 0.104 W/(m·K),compressive strength from0.70 MPa to 0.79 MPa,water absorption rate from 29.42%to 38.95%,moisture absorption rate from 13.33%to31.48%,and the maximum sound absorption coefficient is 0.80,with a maximum sound insulation of 56.66 dB.Additionally,a non-combustible A-grade fire resistance was achieved.To expand the application space and scope of the novel material,the research team further explored on-site construction material preparation processes and conducted experimental research,focusing on the key aspect of the"curing process".The low temperature curing method of industrial heating blanket was proposed.The research results indicated that the method is feasible.At an environmental temperature of 25℃,with different curing times and curing temperatures,the material's thermal conductivity ranges from 0.089 W/(m·K)to 0.109 W/(m·K),and the compressive strength is between 0.14 MPa and 0.70 MPa,meeting the relevant parameter requirements.This research opens up avenues for other types of biomass with high economic added value applications and can be directly applied to improving the thermal environment of residential buildings,contributing to building energy saving,rural revitalization,and the implementation of dual-carbon strategies in China.
