Durability of Bamboo Bio-Concretes Exposed to Natural Aging

Andreola, Vanessa Maria; Gloria, M’hamed Yassin Rajiv da; Filho, Romildo Dias Tolêdo

doi:10.4028/www.scientific.net/cta.1.834

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…Next, an additional water named compensating water (Wc) was used based on the BA water absorption. A setting accelerator, calcium chloride (CC), was incorporated at a content of 2% relative to the mass of the cementitious materials, following the findings of previous study [ 30 ]. The proportion of the mixture produced in this research is summarized in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

“…The dosage of the bio-concrete was established to minimize cement consumption, reduce the carbon footprint, and meet the required workability for molding through mechanical vibration. Drawing from previous research conducted on wood and bamboo bio-concrete [21,29], a volumetric fraction of 45% of bio-aggregate (BA) was selected in the composition. This choice was made considering the potential applications of the bio-concrete produced, such as in wall cladding, partition blocks, and retrofit panels for facades.…”

Section: Wood Bio-concretementioning

confidence: 99%

“…The cement matrix was composed, based on mass, of 45% Portland Cement (PC), 25% Rice Husk Ash (RHA), and 30% Fly Ash (FA), as used in previous works [21,29]. The water-to-binder ratio was set at 0.30, taking into account the hydration water (Wh).…”

Section: Wood Bio-concretementioning

confidence: 99%

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Assessment of Wood Bio-Concrete Properties Modified with Silane–Siloxane

de Aguiar,

da Silva,

Gomes

et al. 2023

Materials

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Bio-based materials, such as wood bio-concrete (WBC), hold promise in reducing energy consumption and carbon footprint of the construction industry. However, the durability of these materials is not well understood and can be negatively affected by the high water absorption capacity of wood bio-aggregates. In the field of cement composites, for example, silane–siloxane-based water repellent has been used to protect such materials from natural environmental attack. Nevertheless, there is still a limited understanding of various aspects related to this type of treatment, including its performance when applied to the bio-concrete substrate. This research aimed to investigate the influence of silane–siloxane on the rheology and hydration of cementitious paste through isothermal calorimetry and thermogravimetric analysis. Additionally, the impact of silane–siloxane on the physical and mechanical properties of WBCs was examined by conducting tests at fresh state (flow table and entrained air content) and hardened state (compressive strength and capillary water absorption). The composites were produced with a volumetric fraction of 45% of wood shavings while the cement matrix consisted of a combination of cement, rice husk ash, and fly ash. Silane–siloxane was applied in three ways: as coating, incorporated as an admixture, and in a combination of both methods. The results indicated that by incorporating silane in the cementitious pastethe viscosity increased by 40% and the hydration was delayed by approximately 6 h when compared to the reference. In addition, silane improved the compressive strength of WBCs by 24% when incorporated into the mixture, expressively reduced the water sorptivity of WBCs (93%), and was more effective if used as coating.

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Section: Methodsmentioning

confidence: 99%

Section: Wood Bio-concretementioning

confidence: 99%

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Assessment of Wood Bio-Concrete Properties Modified with Silane–Siloxane

de Aguiar,

da Silva,

Gomes

et al. 2023

Materials

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“…We can see that, for the development of low carbon bio-concretes, the use of SCM replacing Portland cement is required. In addition, the use of adequate SCMs can improve some properties, e.g., rheology and mechanical, as verified by Caldas et al (2020a) and Andreola et al (2019). It is important to say that a fair comparison among different bio-concretes must be done carefully, especially when they have diverse bio-based content and, consequently, properties.…”

Section: Fig 1: Carbon Footprint For Brazilian Context (A) Carbon Foo...mentioning

confidence: 99%

Development of GHG Emissions Curves for Bio-Concretes Specification: Case Study for Bamboo, Rice Husk, and Wood Shavings Considering the Context of Different Countries

Caldas

Bezerra

Pittau

et al. 2022

Construction Technologies and Architecture

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Bio-concretes are receiving special attention in recent research as an alternative for climate change mitigation due to their low carbon footprints. Different bio-based materials can be used, e.g., wood shavings, bamboo, rice husk, and coconut. However, various methodological parameters can influence the carbon footprint of bio-based materials, especially bio-concretes, like biogenic carbon, amount of carbon in dry matter, rotation period of bio-aggregates, and type of cementitious materials. It is important to have easier ways of estimating the carbon footprint of bio-concretes, using parameters and data easily available. This research aims to evaluate the (1) carbon footprint of different mixtures of three bio-concretes (wood bio-concrete - WBC, bamboo bio-concrete - BBC and rice husk bio-concrete - RBC), and the (2) development of GHG emissions curves for bio-concretes specification based on easily available data (such as density, biomass content, and compressive strength). Based on experimental data, the carbon footprint was performed using the Life Cycle Assessment (LCA) methodology. In order to extend the findings of this study, the context of the following four countries was evaluated: Brazil, South Africa, India, and China. In addition, the replacement of Portland cement for Supplementary Cementitious Materials (SCMs) are evaluated hypothetically. The results show that the increase of biomass content in bio-concretes and the replacement of Portland cement by SCMs leads to a radical decrease in life cycle GHG emissions. The percentage of carbon in biomass is a critical factor for reducing the carbon footprint. The WBC was the biomass that performed better for this parameter. The presented GHG emissions curves can be a useful way to estimate the carbon footprint of bio-concretes and can be adapted to other kinds of bio-concretes and countries.

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