A comprehensive approach for designing workable bio-based cementitious composites

Gloria, M’hamed Yassin Rajiv da; Andreola, Vanessa Maria; Santos, Daniele Oliveira Justo dos; Pepe, Marco; Filho, Romildo Dias Tolêdo

doi:10.1016/j.jobe.2020.101696

Cited by 24 publications

(34 citation statements)

References 31 publications

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“…The bamboo particles used in the mortars' production were resultant of the mixture of equal parts of those retained in the sieves of 300 µm and 600 µm. The bulk density, moisture content and water absorption were 500 kg/m 3 , 8.5%, and 61.7%, respectively, according to NM 52 [48] and NBR 9939 [49], and the methodology adopted was by Da Gloria et al [34] with adaptations for the molding time (t = 4 min).…”

Section: Methodsmentioning

confidence: 99%

“…parts of those retained in the sieves of 300 μm and 600 μm. The bulk density, moisture content and water absorption were 500 kg/m 3 , 8.5%, and 61.7%, respectively, according to NM 52 [48] and NBR 9939 [49], and the methodology adopted was by Da Gloria et al [34] with adaptations for the molding time (t = 4 min). parts of those retained in the sieves of 300 μm and 600 μm.…”

Section: Methodsmentioning

confidence: 99%

“…The insulating behavior of earth mortars was improved when the vegetable fiber content varied from 4% to 12% (in relation to the total mass of the composite), with a reduction in bulk density and an increase in porosity [17]. Although there are several papers in the literature on the use of bamboo as a structural element in concrete and other construction applications [33][34][35][36], there is a scarcity of data about bamboo particles used in earth-based plastering mortars.…”

Section: Introductionmentioning

confidence: 99%

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Thermal-Energy Analysis and Life Cycle GHG Emissions Assessments of Innovative Earth-Based Bamboo Plastering Mortars

et al. 2021

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Biomaterials and raw earth have demonstrated a promising potential for improving various thermal properties of plastering mortars used in buildings. The objective of this research was the evaluation of the thermal-energy performances and life cycle greenhouse gas (GHG) emissions of different mixtures of engineered, bio-based earth mortars composed of bamboo particles, earth, and different cementitious materials. Four mixtures were assessed: mortars without bamboo particles (matrix), and mortars containing 3%, 6%, or 9% of bamboo particles by volume. The bulk density and thermal conductivity values obtained for the matrix and mortars with the highest percentage of bamboo particles (9%) were 1704.13 and 1471.80 kg/m3, and 0.62 and 0.43 W/M·K, respectively. Based on experimental results, thermal-energy simulations were carried out using a social housing project as a case study. The simulations evaluated different climate conditions and applied life cycle GHG emissions assessment methodology. Compared with typical cement and lime plastering mortars, the proposed bio-based earth mortars presented a superior thermal-energy performance and lower GHG emissions, particularly the 9% bamboo particles mixture. GHG emissions reached a maximum decrease of 28%. The main scientific contribution of this research is the presentation of an engineered, bio-based earth mortar that can be manufactured using local raw materials available in most developing countries with significant housing demands. The method used, based on experimental research, thermal-energy analysis, and life cycle GHG emissions, may be used for evaluating other innovative materials. It was verified that even with thin plastering in buildings, it is possible to achieve energy efficiency gains and to reduce GHG emissions.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal-Energy Analysis and Life Cycle GHG Emissions Assessments of Innovative Earth-Based Bamboo Plastering Mortars

et al. 2021

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“…For this reason, it is regularly used as an insulation or filling material in buildings. On the other hand, different bio-concretes made with wood shavings and bamboo waste, have better mechanical performances, with compressive strengths values ranging from 5 MPa to 10 MPa [22], [26], [31] and can be used for other building applications, like walls (for internal partitions and façades), ceilings, shading elements, furniture, etc. In addition, there are other options and available sources of bio-based materials, such as rice husk, corn flakes, coconut, etc.…”

Section: Introductionmentioning

confidence: 99%

Circular economy in concrete production: Greenhouse Gas (GHG) emissions assessment of rice husk bio-concretes

Caldas

Araujo

Hasparyk

et al. 2022

Rev. IBRACON Estrut. Mater.

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Circular Economy (CE) is progressively attracting interest from construction sector stakeholders to support the development of products with higher amounts of recovered materials in order to decrease greenhouse gas (GHG) emissions. Concrete is one of the most used materials in the world and can be produced using waste as raw materials, including, bio-based sources, from both agricultural and forest activities. This research aims to assess the GHG emissions in the life cycle of innovative rice husk bio-concretes (RBC) in which rice husk (RH) and rice husk ash (RHA) are used as circular solutions. Four RBC, considering ordinary Portland cement replacement by 8% of RHA and, different contents of sand substitution by RH (0; 5 and 10%), were assessed. The Life Cycle Assessment (LCA) methodology was used, with a cradle-to-gate scope, using the GWPbio method, that contemplate the influence of biogenic carbon on the emissions reduction. Different transportation scenarios were evaluated considering the RBC production in different Brazilian regions. The service life of RBC in terms of carbon stock was also evaluated. Two carbon-performance indicators are also evaluated in terms of RBC compressive strength and thermal conductivity values. As the main conclusion, cement replacement by RHA alongside with sand replacement by RH are promising strategies to produce bio-concretes for specific applications, such as panels, partitions and façade elements, and to reduce its GHG emissions. However, this benefit varies according to RH availability, transport efficiency and RBC service life. The RBC can be considered a potential alternative for concrete industry, for specific applications, to reduce GHG emissions and can be developed where rice waste is an available source. This study contributes by presenting a new material and a methodology for the evaluation of life cycle GHG emissions of bio-concretes, which can help to promote a circular construction sector.

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“…Bamboo Bio-Concrete (BBC) is characterized as a lightweight material, with a density ranging from 615-1200 kg/m³ and a compressive strength that can range from 3.6-21.0 MPa [15,16]. Caldas et al [17] evaluated the environmental profile of BBCs with cement-only matrixes and found that cement is the main responsible for GHG emissions due to clinker production which demands a high amount of energy and has a high content of process-related emissions due to limestone calcination.…”

Section: Introductionmentioning

confidence: 99%

Potential of Earth-Based Bamboo Bio-Concrete in the Search for Circular and Net-Zero Carbon Solutions to Construction Industry

Araujo

Silva

Sá

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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In order to limit climate change by achieving goals of cutting emissions down to net-zero by 2050, stronger efforts are needed to reduce the whole life cycle emissions of buildings. Integrating residual bio-based and earth-based solutions to concrete seems to stand out in the sector since these solutions have the potential of lowering materials embodied emissions, and enhancing building thermal performance. However, it is still unclear how environmentally beneficial bio-based and earth-based materials are and how they behave mechanically when they are both integrated into concrete. In order to know their potential applications in the sector, this study aims to evaluate and compare the mechanical performance and environmental profile of Earth-based Bamboo Bio-Concretes (EBBCs) with different earth fractions as partial replacements of the cementitious matrix, by evaluating its Greenhouse Gas (GHG) emissions. For that, it was considered the use of only bio-based aggregates (bamboo waste) instead of mineral ones at a fixed volume fraction of 45%. The methodology involved the: processing and characterization of earth and bamboo; EBBCs dosage study and mechanical testing; consideration of fixed proportions of binders of 30:30:40 (cement: metakaolin: fly ash) which were replaced gradually by earth in the volume fractions of 10%, 15%, and 20%. The Life Cycle Assessment (LCA) was used for accounting GHG emissions. LCA scope was from cradle-to-gate considering biogenic carbon methodology and avoided impacts of incinerating bamboo waste. A sensitive analysis was performed to evaluate the impact of transport distances variation of bamboo waste. Mechanical results point to an increase in EBBCs compressive strength with the increase of earth content until 15% of cementitious matrix replacement. LCA results showed negative embodied GHG emissions in all mixtures with an average of -115,7 kgCO2-eq/m3 mainly due to the high biomass content in mixtures. The increase of earth content from 0% to 20% in the mixtures reduced emissions by 59,7 kgCO2-eq/m3 since the binder’s content was reduced. With that, EBBC seems to be a promising innovative material to help achieve net-zero carbon emission targets and a circular pathway in the building and construction sectors.

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A comprehensive approach for designing workable bio-based cementitious composites

Cited by 24 publications

References 31 publications

Thermal-Energy Analysis and Life Cycle GHG Emissions Assessments of Innovative Earth-Based Bamboo Plastering Mortars

Thermal-Energy Analysis and Life Cycle GHG Emissions Assessments of Innovative Earth-Based Bamboo Plastering Mortars

Circular economy in concrete production: Greenhouse Gas (GHG) emissions assessment of rice husk bio-concretes

Potential of Earth-Based Bamboo Bio-Concrete in the Search for Circular and Net-Zero Carbon Solutions to Construction Industry

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