Innovative sandwich panels made of wood bio-concrete and sisal fiber reinforced cement composites

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

doi:10.1016/j.conbuildmat.2020.121636

Cited by 27 publications

(26 citation statements)

References 10 publications

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“…Their main advantages are the fact that they are renewable and eco-friendly resources. The main disadvantages are the great variability of properties and the possibility of degradation in an alkaline environment, especially in the case of fibers of vegetable origin that need previous treatments to be applied in cementitious matrices [ 72 , 227 , 230 ]. Another important advantage of natural fibers, especially vegetable fibers, is related to the fiber’s high adherence to the OPC matrix.…”

Section: Hpc and Uhpc Containing Fibers: Composite Materialsmentioning

confidence: 99%

“…The adhesion mechanisms of this type of fiber are related to the fibrous structure of the cellulose [ 72 ]. Some authors have carried out studies on the improvement of the adhesion properties of these fibers through treatments with alkaline materials, which attack the fiber surface, increasing the roughness and adhesion with the matrix [ 227 , 230 ].…”

Section: Hpc and Uhpc Containing Fibers: Composite Materialsmentioning

confidence: 99%

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Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

103

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This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

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Section: Hpc and Uhpc Containing Fibers: Composite Materialsmentioning

confidence: 99%

Section: Hpc and Uhpc Containing Fibers: Composite Materialsmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

103

View full text Add to dashboard Cite

show abstract

“…From the experimental results, the compressive strength at 28 days (fc28) and the WBC density (γ) can be correlated through the polynomial Equation (1). fc28 = k1•γ 5 (1…”

Section: Compressive Strength Vs Bulk Densitymentioning

confidence: 99%

A Comprehensive Approach for Designing Low Carbon Wood Bio-Concretes

da Gloria,

Caldas,

Barros

et al. 2024

Materials

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This paper presents a method for designing low carbon bio-based building materials, also named bio-concretes, produced with wood wastes in shavings form (WS) and cementitious pastes. As the aggregates phase of bio-concretes is composed of plant-based particles, known as porous and high water-absorbing materials, the bio-concretes cannot be designed by using the traditional design rules used for conventional mortar or concrete. Then, the method used in the current paper is an adaptation of a previous one that has been developed in a recent paper where bio-concretes were produced with a cement matrix, three types of bio-aggregates, and a proposal of a design abacus. However, when that abacus is used for designing WBC with low cement content in the matrix, the target compressive strength is not reached. In the present paper, the method is extended to low cement content matrix (up to 70% of cement substitution) and also considering the greenhouse gas (GHG) emission of the WBC. To obtain data for proposing a new design abacus, an experimental program was carried out by producing nine workable WBCs, varying wood volumetric fractions (40–45–50%), and water-to-binder ratios. The bio-concretes produced presented adequate consistency, lightness (density between 715 and 1207 kg/m3), and compressive strength ranging from 0.64 to 12.27 MPa. In addition, the GHG emissions of the WBC were analysed through the Life Cycle Assessment methodology. From the relationships obtained between density, compressive strength, water-to-binder ratio, cement consumption, and GHG emissions of the WBC, calibration constants were proposed for developing the updated and more complete abacus regarding an integrated mix design methodology.

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“…Plant-derived fibers can reinforce cement-based products [15][16][17][18][19]. The fibers used in this study are from Arundo Donax L. This plant is a non-timber plant growing abundantly and naturally in Indonesia.…”

Section: Introductionmentioning

confidence: 99%

Artificial Intelligence Models for Predicting the Compressive Strength of Geopolymer Cements

Rahmawati,

Aisyah,

Sanusi

et al. 2024

Civ Eng J

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The utilization of nanosilica and cellulose nanocrystals (CNCs) in cement geopolymers remains challenged by intricacies and uncertainties regarding their concentration, posing difficulties in the formulation of systematic geopolymer mix designs. This study aims to formulate models based on Artificial Neural Networks (ANN) capable of forecasting the compressive strength of geopolymers through the utilization of experimentally acquired data. Nanosilica was applied at concentrations of 2%–4% and CNCs at 1%–3%. ANN was modeled using MATLAB to predict the compressive strength of the geopolymer. The results indicated an effect of nanosilica and CNCs on the compressive strength of geopolymer at 2%–4% concentration and 1%–3% CNCs. The best ANN was the GDX training function, purelin activation function, LGD and LGDM learning functions, Lr 0.1 and 0.01 at the number of epochs 3812 out of 25000 and 1774 out of 25000, resulting in the best correlation values of 0.994 and 0.959; the lowest RMSE values are 0.022 and 0.110. The results of the ANN model built based on actual data prove that the model is helpful for accurate simulation to predict the compressive strength of geopolymer cement. This study contributes novelty by optimizing the design model for Geopolymer Cements incorporating nanosilica and CNCs. Doi: 10.28991/CEJ-SP2024-010-03 Full Text: PDF

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Innovative sandwich panels made of wood bio-concrete and sisal fiber reinforced cement composites

Cited by 27 publications

References 10 publications

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

A Comprehensive Approach for Designing Low Carbon Wood Bio-Concretes

Artificial Intelligence Models for Predicting the Compressive Strength of Geopolymer Cements

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